* [syzbot] [mm?] general protection fault in do_migrate_pages @ 2024-11-20 0:00 syzbot 2024-11-20 15:38 ` David Hildenbrand 2024-11-20 18:50 ` David Hildenbrand 0 siblings, 2 replies; 7+ messages in thread From: syzbot @ 2024-11-20 0:00 UTC (permalink / raw) To: akpm, linux-kernel, linux-mm, syzkaller-bugs Hello, syzbot found the following issue on: HEAD commit: f868cd251776 Merge tag 'drm-fixes-2024-11-16' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15473cc0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ff8e8187a30080b5 dashboard link: https://syzkaller.appspot.com/bug?extid=3511625422f7aa637f0d compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e8d130580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159c71a7980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a0d46da55993/disk-f868cd25.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/da57ef4813fd/vmlinux-f868cd25.xz kernel image: https://storage.googleapis.com/syzbot-assets/3cdde892ea08/bzImage-f868cd25.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3511625422f7aa637f0d@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> kernel_migrate_pages+0x5b2/0x750 mm/mempolicy.c:1709 __do_sys_migrate_pages mm/mempolicy.c:1727 [inline] __se_sys_migrate_pages mm/mempolicy.c:1723 [inline] __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1723 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fedcca74af9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe4d85c278 EFLAGS: 00000206 ORIG_RAX: 0000000000000100 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fedcca74af9 RDX: 0000000020000000 RSI: 000000000000005a RDI: 0000000000001786 RBP: 0000000000010bf2 R08: 0000000000006080 R09: 0000000000000006 R10: 0000000020000040 R11: 0000000000000206 R12: 00007ffe4d85c28c R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 54 24 30 mov 0x30(%rsp),%edx 4: 41 83 c8 10 or $0x10,%r8d 8: 80 3a 00 cmpb $0x0,(%rdx) b: 4d 63 c0 movslq %r8d,%r8 e: 0f 85 d1 02 00 00 jne 0x2e5 14: 48 89 c1 mov %rax,%rcx 17: 48 8b 54 24 18 mov 0x18(%rsp),%rdx 1c: 48 be 00 00 00 00 00 movabs $0xdffffc0000000000,%rsi 23: fc ff df 26: 48 c1 e9 03 shr $0x3,%rcx * 2a: 80 3c 31 00 cmpb $0x0,(%rcx,%rsi,1) <-- trapping instruction 2e: 48 8b 92 b0 00 00 00 mov 0xb0(%rdx),%rdx 35: 0f 85 74 02 00 00 jne 0x2af 3b: 48 8b 30 mov (%rax),%rsi 3e: 49 rex.WB 3f: 89 .byte 0x89 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [syzbot] [mm?] general protection fault in do_migrate_pages 2024-11-20 0:00 [syzbot] [mm?] general protection fault in do_migrate_pages syzbot @ 2024-11-20 15:38 ` David Hildenbrand 2024-11-20 16:39 ` David Hildenbrand 2024-11-20 18:50 ` David Hildenbrand 1 sibling, 1 reply; 7+ messages in thread From: David Hildenbrand @ 2024-11-20 15:38 UTC (permalink / raw) To: syzbot, akpm, linux-kernel, linux-mm, syzkaller-bugs On 20.11.24 01:00, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: f868cd251776 Merge tag 'drm-fixes-2024-11-16' of https://g.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=15473cc0580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ff8e8187a30080b5 > dashboard link: https://syzkaller.appspot.com/bug?extid=3511625422f7aa637f0d > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e8d130580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159c71a7980000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/a0d46da55993/disk-f868cd25.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/da57ef4813fd/vmlinux-f868cd25.xz > kernel image: https://storage.googleapis.com/syzbot-assets/3cdde892ea08/bzImage-f868cd25.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+3511625422f7aa637f0d@syzkaller.appspotmail.com > > Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] > CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 > RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] > RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 > Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 > RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 > RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 > RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 > R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 > R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 > FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > kernel_migrate_pages+0x5b2/0x750 mm/mempolicy.c:1709 > __do_sys_migrate_pages mm/mempolicy.c:1727 [inline] > __se_sys_migrate_pages mm/mempolicy.c:1723 [inline] > __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1723 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fedcca74af9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffe4d85c278 EFLAGS: 00000206 ORIG_RAX: 0000000000000100 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fedcca74af9 > RDX: 0000000020000000 RSI: 000000000000005a RDI: 0000000000001786 > RBP: 0000000000010bf2 R08: 0000000000006080 R09: 0000000000000006 > R10: 0000000020000040 R11: 0000000000000206 R12: 00007ffe4d85c28c > R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] > RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 > Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 > RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 > RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 > RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 > R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 > R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 > FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: 8b 54 24 30 mov 0x30(%rsp),%edx > 4: 41 83 c8 10 or $0x10,%r8d > 8: 80 3a 00 cmpb $0x0,(%rdx) > b: 4d 63 c0 movslq %r8d,%r8 > e: 0f 85 d1 02 00 00 jne 0x2e5 > 14: 48 89 c1 mov %rax,%rcx > 17: 48 8b 54 24 18 mov 0x18(%rsp),%rdx > 1c: 48 be 00 00 00 00 00 movabs $0xdffffc0000000000,%rsi > 23: fc ff df > 26: 48 c1 e9 03 shr $0x3,%rcx > * 2a: 80 3c 31 00 cmpb $0x0,(%rcx,%rsi,1) <-- trapping instruction > 2e: 48 8b 92 b0 00 00 00 mov 0xb0(%rdx),%rdx > 35: 0f 85 74 02 00 00 jne 0x2af > 3b: 48 8b 30 mov (%rax),%rsi > 3e: 49 rex.WB > 3f: 89 .byte 0x89 > Hmmm, there is not much meat in this report :) The reproducer seems to execute migrate_pages() in a fork'ed child process, and kills that process after a while. Not 100% sure if the concurrent killing of the process is relevant. Before the child process calls migrate_pages(), it executes MADV_DONTFORK on the complete address space (funny, I wonder what that does ...) and then calls clone3() without CLONE_VM. -- Cheers, David / dhildenb ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [syzbot] [mm?] general protection fault in do_migrate_pages 2024-11-20 15:38 ` David Hildenbrand @ 2024-11-20 16:39 ` David Hildenbrand 2024-11-20 18:11 ` David Hildenbrand 0 siblings, 1 reply; 7+ messages in thread From: David Hildenbrand @ 2024-11-20 16:39 UTC (permalink / raw) To: syzbot, akpm, linux-kernel, linux-mm, syzkaller-bugs On 20.11.24 16:38, David Hildenbrand wrote: > On 20.11.24 01:00, syzbot wrote: >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: f868cd251776 Merge tag 'drm-fixes-2024-11-16' of https://g.. >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=15473cc0580000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=ff8e8187a30080b5 >> dashboard link: https://syzkaller.appspot.com/bug?extid=3511625422f7aa637f0d >> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e8d130580000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159c71a7980000 >> >> Downloadable assets: >> disk image: https://storage.googleapis.com/syzbot-assets/a0d46da55993/disk-f868cd25.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot-assets/da57ef4813fd/vmlinux-f868cd25.xz >> kernel image: https://storage.googleapis.com/syzbot-assets/3cdde892ea08/bzImage-f868cd25.xz >> >> IMPORTANT: if you fix the issue, please add the following tag to the commit: >> Reported-by: syzbot+3511625422f7aa637f0d@syzkaller.appspotmail.com >> >> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI >> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] >> CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 >> RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] >> RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 >> Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 >> RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 >> RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 >> RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 >> RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 >> R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 >> R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 >> FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> Call Trace: >> <TASK> >> kernel_migrate_pages+0x5b2/0x750 mm/mempolicy.c:1709 >> __do_sys_migrate_pages mm/mempolicy.c:1727 [inline] >> __se_sys_migrate_pages mm/mempolicy.c:1723 [inline] >> __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1723 >> do_syscall_x64 arch/x86/entry/common.c:52 [inline] >> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> RIP: 0033:0x7fedcca74af9 >> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 >> RSP: 002b:00007ffe4d85c278 EFLAGS: 00000206 ORIG_RAX: 0000000000000100 >> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fedcca74af9 >> RDX: 0000000020000000 RSI: 000000000000005a RDI: 0000000000001786 >> RBP: 0000000000010bf2 R08: 0000000000006080 R09: 0000000000000006 >> R10: 0000000020000040 R11: 0000000000000206 R12: 00007ffe4d85c28c >> R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 >> </TASK> >> Modules linked in: >> ---[ end trace 0000000000000000 ]--- >> RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] >> RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 >> Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 >> RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 >> RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 >> RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 >> RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 >> R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 >> R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 >> FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> ---------------- >> Code disassembly (best guess): >> 0: 8b 54 24 30 mov 0x30(%rsp),%edx >> 4: 41 83 c8 10 or $0x10,%r8d >> 8: 80 3a 00 cmpb $0x0,(%rdx) >> b: 4d 63 c0 movslq %r8d,%r8 >> e: 0f 85 d1 02 00 00 jne 0x2e5 >> 14: 48 89 c1 mov %rax,%rcx >> 17: 48 8b 54 24 18 mov 0x18(%rsp),%rdx >> 1c: 48 be 00 00 00 00 00 movabs $0xdffffc0000000000,%rsi >> 23: fc ff df >> 26: 48 c1 e9 03 shr $0x3,%rcx >> * 2a: 80 3c 31 00 cmpb $0x0,(%rcx,%rsi,1) <-- trapping instruction >> 2e: 48 8b 92 b0 00 00 00 mov 0xb0(%rdx),%rdx >> 35: 0f 85 74 02 00 00 jne 0x2af >> 3b: 48 8b 30 mov (%rax),%rsi >> 3e: 49 rex.WB >> 3f: 89 .byte 0x89 >> > > Hmmm, there is not much meat in this report :) > > The reproducer seems to execute migrate_pages() in a fork'ed child > process, and kills that process after a while. Not 100% sure if the > concurrent killing of the process is relevant. > > Before the child process calls migrate_pages(), it executes > MADV_DONTFORK on the complete address space (funny, I wonder what that > does ...) and then calls clone3() without CLONE_VM. > After running it for a while in a VM with the given config: [ 827.514143][T37171] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 827.516614][T37171] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 827.518162][T37171] CPU: 4 UID: 0 PID: 37171 Comm: repro4 Not tainted 6.12.0-rc7-00187-gf868cd251776 #99 [ 827.519935][T37171] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014 [ 827.521648][T37171] RIP: 0010:do_migrate_pages+0x404/0x6e0 [ 827.522774][T37171] Code: 10 80 39 00 4d 63 c0 0f 85 9b 02 00 00 48 be 00 00 00 00 00 fc ff df 48 8b 4c 24 28 48 8b 91 b0 00 00 00 48 89 c1 48 c1 e9 03 <80> 3c 31 00 0f 85 95 02 00 00 48 8b 30 49 89 d9 48 8b 4c 24 08 48 [ 827.526342][T37171] RSP: 0018:ffffc90028157ce8 EFLAGS: 00010256 [ 827.527480][T37171] RAX: 0000000000000000 RBX: ffffc90028157d68 RCX: 0000000000000000 [ 827.528942][T37171] RDX: 00007ffffffff000 RSI: dffffc0000000000 RDI: ffff88811dcd8444 [ 827.530406][T37171] RBP: 0000000000000003 R08: 0000000000000014 R09: ffff88811dcd8ad8 [ 827.531865][T37171] R10: ffffffff903e668f R11: 0000000000000000 R12: ffffc90028157e80 [ 827.533341][T37171] R13: ffff8881f3a2b0a8 R14: ffffc90028157e28 R15: ffffc90028157e88 [ 827.534806][T37171] FS: 00007f096d49f740(0000) GS:ffff8881f4a00000(0000) knlGS:0000000000000000 [ 827.536452][T37171] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 827.537672][T37171] CR2: 00007ff2dcb96810 CR3: 00000001eed18000 CR4: 0000000000750ef0 [ 827.539135][T37171] PKRU: 55555554 [ 827.539799][T37171] Call Trace: [ 827.540407][T37171] <TASK> [ 827.540965][T37171] ? die_addr.cold+0x8/0xd [ 827.541823][T37171] ? exc_general_protection+0x147/0x240 [ 827.542888][T37171] ? asm_exc_general_protection+0x26/0x30 [ 827.543960][T37171] ? do_migrate_pages+0x404/0x6e0 [ 827.544915][T37171] ? do_migrate_pages+0x3cd/0x6e0 [ 827.545873][T37171] ? __pfx_do_migrate_pages+0x10/0x10 [ 827.546895][T37171] ? do_raw_spin_lock+0x12a/0x2b0 [ 827.547854][T37171] ? apparmor_capable+0x11c/0x3b0 [ 827.548818][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 [ 827.549878][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 [ 827.550937][T37171] ? security_capable+0x80/0x260 [ 827.551893][T37171] kernel_migrate_pages+0x5b7/0x750 [ 827.552891][T37171] ? __pfx_kernel_migrate_pages+0x10/0x10 [ 827.553975][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 [ 827.555028][T37171] ? rcu_is_watching+0x12/0xc0 [ 827.555938][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 [ 827.557000][T37171] __x64_sys_migrate_pages+0x96/0x100 [ 827.558022][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 [ 827.559077][T37171] ? lockdep_hardirqs_on+0x7b/0x110 [ 827.560052][T37171] do_syscall_64+0xc7/0x250 [ 827.560909][T37171] entry_SYSCALL_64_after_hwframe+0x77/0x7f -- Cheers, David / dhildenb ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [syzbot] [mm?] general protection fault in do_migrate_pages 2024-11-20 16:39 ` David Hildenbrand @ 2024-11-20 18:11 ` David Hildenbrand 2024-11-20 18:38 ` David Hildenbrand 0 siblings, 1 reply; 7+ messages in thread From: David Hildenbrand @ 2024-11-20 18:11 UTC (permalink / raw) To: syzbot, akpm, linux-kernel, linux-mm, syzkaller-bugs On 20.11.24 17:39, David Hildenbrand wrote: > On 20.11.24 16:38, David Hildenbrand wrote: >> On 20.11.24 01:00, syzbot wrote: >>> Hello, >>> >>> syzbot found the following issue on: >>> >>> HEAD commit: f868cd251776 Merge tag 'drm-fixes-2024-11-16' of https://g.. >>> git tree: upstream >>> console output: https://syzkaller.appspot.com/x/log.txt?x=15473cc0580000 >>> kernel config: https://syzkaller.appspot.com/x/.config?x=ff8e8187a30080b5 >>> dashboard link: https://syzkaller.appspot.com/bug?extid=3511625422f7aa637f0d >>> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 >>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e8d130580000 >>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159c71a7980000 >>> >>> Downloadable assets: >>> disk image: https://storage.googleapis.com/syzbot-assets/a0d46da55993/disk-f868cd25.raw.xz >>> vmlinux: https://storage.googleapis.com/syzbot-assets/da57ef4813fd/vmlinux-f868cd25.xz >>> kernel image: https://storage.googleapis.com/syzbot-assets/3cdde892ea08/bzImage-f868cd25.xz >>> >>> IMPORTANT: if you fix the issue, please add the following tag to the commit: >>> Reported-by: syzbot+3511625422f7aa637f0d@syzkaller.appspotmail.com >>> >>> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI >>> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] >>> CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0 >>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 >>> RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] >>> RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 >>> Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 >>> RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 >>> RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 >>> RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 >>> RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 >>> R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 >>> R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 >>> FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 >>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 >>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >>> Call Trace: >>> <TASK> >>> kernel_migrate_pages+0x5b2/0x750 mm/mempolicy.c:1709 >>> __do_sys_migrate_pages mm/mempolicy.c:1727 [inline] >>> __se_sys_migrate_pages mm/mempolicy.c:1723 [inline] >>> __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1723 >>> do_syscall_x64 arch/x86/entry/common.c:52 [inline] >>> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 >>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>> RIP: 0033:0x7fedcca74af9 >>> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 >>> RSP: 002b:00007ffe4d85c278 EFLAGS: 00000206 ORIG_RAX: 0000000000000100 >>> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fedcca74af9 >>> RDX: 0000000020000000 RSI: 000000000000005a RDI: 0000000000001786 >>> RBP: 0000000000010bf2 R08: 0000000000006080 R09: 0000000000000006 >>> R10: 0000000020000040 R11: 0000000000000206 R12: 00007ffe4d85c28c >>> R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 >>> </TASK> >>> Modules linked in: >>> ---[ end trace 0000000000000000 ]--- >>> RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] >>> RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 >>> Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 >>> RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 >>> RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 >>> RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 >>> RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 >>> R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 >>> R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 >>> FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 >>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 >>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >>> ---------------- >>> Code disassembly (best guess): >>> 0: 8b 54 24 30 mov 0x30(%rsp),%edx >>> 4: 41 83 c8 10 or $0x10,%r8d >>> 8: 80 3a 00 cmpb $0x0,(%rdx) >>> b: 4d 63 c0 movslq %r8d,%r8 >>> e: 0f 85 d1 02 00 00 jne 0x2e5 >>> 14: 48 89 c1 mov %rax,%rcx >>> 17: 48 8b 54 24 18 mov 0x18(%rsp),%rdx >>> 1c: 48 be 00 00 00 00 00 movabs $0xdffffc0000000000,%rsi >>> 23: fc ff df >>> 26: 48 c1 e9 03 shr $0x3,%rcx >>> * 2a: 80 3c 31 00 cmpb $0x0,(%rcx,%rsi,1) <-- trapping instruction >>> 2e: 48 8b 92 b0 00 00 00 mov 0xb0(%rdx),%rdx >>> 35: 0f 85 74 02 00 00 jne 0x2af >>> 3b: 48 8b 30 mov (%rax),%rsi >>> 3e: 49 rex.WB >>> 3f: 89 .byte 0x89 >>> >> >> Hmmm, there is not much meat in this report :) >> >> The reproducer seems to execute migrate_pages() in a fork'ed child >> process, and kills that process after a while. Not 100% sure if the >> concurrent killing of the process is relevant. >> >> Before the child process calls migrate_pages(), it executes >> MADV_DONTFORK on the complete address space (funny, I wonder what that >> does ...) and then calls clone3() without CLONE_VM. >> > > After running it for a while in a VM with the given config: > > [ 827.514143][T37171] Oops: general protection fault, probably for > non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI > [ 827.516614][T37171] KASAN: null-ptr-deref in range > [0x0000000000000000-0x0000000000000007] > [ 827.518162][T37171] CPU: 4 UID: 0 PID: 37171 Comm: repro4 Not tainted > 6.12.0-rc7-00187-gf868cd251776 #99 > [ 827.519935][T37171] Hardware name: QEMU Standard PC (Q35 + ICH9, > 2009), BIOS 1.16.3-2.fc40 04/01/2014 > [ 827.521648][T37171] RIP: 0010:do_migrate_pages+0x404/0x6e0 > [ 827.522774][T37171] Code: 10 80 39 00 4d 63 c0 0f 85 9b 02 00 00 48 > be 00 00 00 00 00 fc ff df 48 8b 4c 24 28 48 8b 91 b0 00 00 00 48 89 c1 > 48 c1 e9 03 <80> 3c 31 00 0f 85 95 02 00 00 48 8b 30 49 89 d9 48 8b 4c > 24 08 48 > [ 827.526342][T37171] RSP: 0018:ffffc90028157ce8 EFLAGS: 00010256 > [ 827.527480][T37171] RAX: 0000000000000000 RBX: ffffc90028157d68 RCX: > 0000000000000000 > [ 827.528942][T37171] RDX: 00007ffffffff000 RSI: dffffc0000000000 RDI: > ffff88811dcd8444 > [ 827.530406][T37171] RBP: 0000000000000003 R08: 0000000000000014 R09: > ffff88811dcd8ad8 > [ 827.531865][T37171] R10: ffffffff903e668f R11: 0000000000000000 R12: > ffffc90028157e80 > [ 827.533341][T37171] R13: ffff8881f3a2b0a8 R14: ffffc90028157e28 R15: > ffffc90028157e88 > [ 827.534806][T37171] FS: 00007f096d49f740(0000) > GS:ffff8881f4a00000(0000) knlGS:0000000000000000 > [ 827.536452][T37171] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 827.537672][T37171] CR2: 00007ff2dcb96810 CR3: 00000001eed18000 CR4: > 0000000000750ef0 > [ 827.539135][T37171] PKRU: 55555554 > [ 827.539799][T37171] Call Trace: > [ 827.540407][T37171] <TASK> > [ 827.540965][T37171] ? die_addr.cold+0x8/0xd > [ 827.541823][T37171] ? exc_general_protection+0x147/0x240 > [ 827.542888][T37171] ? asm_exc_general_protection+0x26/0x30 > [ 827.543960][T37171] ? do_migrate_pages+0x404/0x6e0 > [ 827.544915][T37171] ? do_migrate_pages+0x3cd/0x6e0 > [ 827.545873][T37171] ? __pfx_do_migrate_pages+0x10/0x10 > [ 827.546895][T37171] ? do_raw_spin_lock+0x12a/0x2b0 > [ 827.547854][T37171] ? apparmor_capable+0x11c/0x3b0 > [ 827.548818][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 827.549878][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 827.550937][T37171] ? security_capable+0x80/0x260 > [ 827.551893][T37171] kernel_migrate_pages+0x5b7/0x750 > [ 827.552891][T37171] ? __pfx_kernel_migrate_pages+0x10/0x10 > [ 827.553975][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 827.555028][T37171] ? rcu_is_watching+0x12/0xc0 > [ 827.555938][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 827.557000][T37171] __x64_sys_migrate_pages+0x96/0x100 > [ 827.558022][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 > [ 827.559077][T37171] ? lockdep_hardirqs_on+0x7b/0x110 > [ 827.560052][T37171] do_syscall_64+0xc7/0x250 > [ 827.560909][T37171] entry_SYSCALL_64_after_hwframe+0x77/0x7f .. digging further, we call migrate_pages() with the pid of a process we created using clone3(!CLONE_VM). The crashing code is likely: vma = find_vma(mm, 0); 722c: e8 00 00 00 00 call 7231 <do_migrate_pages+0x3c1> 7231: 48 8b 7c 24 28 mov 0x28(%rsp),%rdi 7236: 31 f6 xor %esi,%esi 7238: e8 00 00 00 00 call 723d <do_migrate_pages+0x3cd> flags | MPOL_MF_DISCONTIG_OK, &pagelist); 723d: 44 8b 44 24 3c mov 0x3c(%rsp),%r8d nr_failed = queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask, 7242: 48 8b 4c 24 40 mov 0x40(%rsp),%rcx flags | MPOL_MF_DISCONTIG_OK, &pagelist); 7247: 41 83 c8 10 or $0x10,%r8d nr_failed = queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask, 724b: 80 39 00 cmpb $0x0,(%rcx) 724e: 4d 63 c0 movslq %r8d,%r8 7251: 0f 85 9b 02 00 00 jne 74f2 <do_migrate_pages+0x682> 7257: 48 be 00 00 00 00 00 movabs $0xdffffc0000000000,%rsi 725e: fc ff df 7261: 48 8b 4c 24 28 mov 0x28(%rsp),%rcx 7266: 48 8b 91 b0 00 00 00 mov 0xb0(%rcx),%rdx 726d: 48 89 c1 mov %rax,%rcx 7270: 48 c1 e9 03 shr $0x3,%rcx 7274: 80 3c 31 00 cmpb $0x0,(%rcx,%rsi,1) <--- we seem toc rash here 7278: 0f 85 95 02 00 00 jne 7513 <do_migrate_pages+0x6a3> 727e: 48 8b 30 mov (%rax),%rsi 7281: 49 89 d9 mov %rbx,%r9 7284: 48 8b 4c 24 08 mov 0x8(%rsp),%rcx 7289: 48 8b 7c 24 28 mov 0x28(%rsp),%rdi 728e: e8 8d 9a ff ff call d20 <queue_pages_range> 7293: 48 89 44 24 30 mov %rax,0x30(%rsp) 7298: e9 c4 00 00 00 jmp 7361 <do_migrate_pages+0x4f1> up_read(&mm->mmap_lock); 729d: e8 00 00 00 00 call 72a2 <do_migrate_pages+0x432> 72a2: 4c 89 ef mov %r13,%rdi 72a5: e8 00 00 00 00 call 72aa <do_migrate_pages+0x43a> Which would be do_migrate_pages()->migrate_to_node(): mmap_read_lock(mm); vma = find_vma(mm, 0); nr_failed = queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask, flags | MPOL_MF_DISCONTIG_OK, &pagelist); mmap_read_unlock(mm); ... and it seems to fail before calling queue_pages_range() :/ Did we, for some reason get a vma=NULL, because someone is concurrently tearing down the MM? -- Cheers, David / dhildenb ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [syzbot] [mm?] general protection fault in do_migrate_pages 2024-11-20 18:11 ` David Hildenbrand @ 2024-11-20 18:38 ` David Hildenbrand 0 siblings, 0 replies; 7+ messages in thread From: David Hildenbrand @ 2024-11-20 18:38 UTC (permalink / raw) To: syzbot, akpm, linux-kernel, linux-mm, syzkaller-bugs On 20.11.24 19:11, David Hildenbrand wrote: > On 20.11.24 17:39, David Hildenbrand wrote: >> On 20.11.24 16:38, David Hildenbrand wrote: >>> On 20.11.24 01:00, syzbot wrote: >>>> Hello, >>>> >>>> syzbot found the following issue on: >>>> >>>> HEAD commit: f868cd251776 Merge tag 'drm-fixes-2024-11-16' of https://g.. >>>> git tree: upstream >>>> console output: https://syzkaller.appspot.com/x/log.txt?x=15473cc0580000 >>>> kernel config: https://syzkaller.appspot.com/x/.config?x=ff8e8187a30080b5 >>>> dashboard link: https://syzkaller.appspot.com/bug?extid=3511625422f7aa637f0d >>>> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 >>>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e8d130580000 >>>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159c71a7980000 >>>> >>>> Downloadable assets: >>>> disk image: https://storage.googleapis.com/syzbot-assets/a0d46da55993/disk-f868cd25.raw.xz >>>> vmlinux: https://storage.googleapis.com/syzbot-assets/da57ef4813fd/vmlinux-f868cd25.xz >>>> kernel image: https://storage.googleapis.com/syzbot-assets/3cdde892ea08/bzImage-f868cd25.xz >>>> >>>> IMPORTANT: if you fix the issue, please add the following tag to the commit: >>>> Reported-by: syzbot+3511625422f7aa637f0d@syzkaller.appspotmail.com >>>> >>>> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI >>>> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] >>>> CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0 >>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 >>>> RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] >>>> RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 >>>> Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 >>>> RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 >>>> RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 >>>> RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 >>>> RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 >>>> R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 >>>> R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 >>>> FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 >>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>>> CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 >>>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >>>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >>>> Call Trace: >>>> <TASK> >>>> kernel_migrate_pages+0x5b2/0x750 mm/mempolicy.c:1709 >>>> __do_sys_migrate_pages mm/mempolicy.c:1727 [inline] >>>> __se_sys_migrate_pages mm/mempolicy.c:1723 [inline] >>>> __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1723 >>>> do_syscall_x64 arch/x86/entry/common.c:52 [inline] >>>> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 >>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>> RIP: 0033:0x7fedcca74af9 >>>> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 >>>> RSP: 002b:00007ffe4d85c278 EFLAGS: 00000206 ORIG_RAX: 0000000000000100 >>>> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fedcca74af9 >>>> RDX: 0000000020000000 RSI: 000000000000005a RDI: 0000000000001786 >>>> RBP: 0000000000010bf2 R08: 0000000000006080 R09: 0000000000000006 >>>> R10: 0000000020000040 R11: 0000000000000206 R12: 00007ffe4d85c28c >>>> R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 >>>> </TASK> >>>> Modules linked in: >>>> ---[ end trace 0000000000000000 ]--- >>>> RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] >>>> RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 >>>> Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 >>>> RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 >>>> RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 >>>> RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 >>>> RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 >>>> R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 >>>> R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 >>>> FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 >>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>>> CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 >>>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >>>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >>>> ---------------- >>>> Code disassembly (best guess): >>>> 0: 8b 54 24 30 mov 0x30(%rsp),%edx >>>> 4: 41 83 c8 10 or $0x10,%r8d >>>> 8: 80 3a 00 cmpb $0x0,(%rdx) >>>> b: 4d 63 c0 movslq %r8d,%r8 >>>> e: 0f 85 d1 02 00 00 jne 0x2e5 >>>> 14: 48 89 c1 mov %rax,%rcx >>>> 17: 48 8b 54 24 18 mov 0x18(%rsp),%rdx >>>> 1c: 48 be 00 00 00 00 00 movabs $0xdffffc0000000000,%rsi >>>> 23: fc ff df >>>> 26: 48 c1 e9 03 shr $0x3,%rcx >>>> * 2a: 80 3c 31 00 cmpb $0x0,(%rcx,%rsi,1) <-- trapping instruction >>>> 2e: 48 8b 92 b0 00 00 00 mov 0xb0(%rdx),%rdx >>>> 35: 0f 85 74 02 00 00 jne 0x2af >>>> 3b: 48 8b 30 mov (%rax),%rsi >>>> 3e: 49 rex.WB >>>> 3f: 89 .byte 0x89 >>>> >>> >>> Hmmm, there is not much meat in this report :) >>> >>> The reproducer seems to execute migrate_pages() in a fork'ed child >>> process, and kills that process after a while. Not 100% sure if the >>> concurrent killing of the process is relevant. >>> >>> Before the child process calls migrate_pages(), it executes >>> MADV_DONTFORK on the complete address space (funny, I wonder what that >>> does ...) and then calls clone3() without CLONE_VM. >>> >> >> After running it for a while in a VM with the given config: >> >> [ 827.514143][T37171] Oops: general protection fault, probably for >> non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI >> [ 827.516614][T37171] KASAN: null-ptr-deref in range >> [0x0000000000000000-0x0000000000000007] >> [ 827.518162][T37171] CPU: 4 UID: 0 PID: 37171 Comm: repro4 Not tainted >> 6.12.0-rc7-00187-gf868cd251776 #99 >> [ 827.519935][T37171] Hardware name: QEMU Standard PC (Q35 + ICH9, >> 2009), BIOS 1.16.3-2.fc40 04/01/2014 >> [ 827.521648][T37171] RIP: 0010:do_migrate_pages+0x404/0x6e0 >> [ 827.522774][T37171] Code: 10 80 39 00 4d 63 c0 0f 85 9b 02 00 00 48 >> be 00 00 00 00 00 fc ff df 48 8b 4c 24 28 48 8b 91 b0 00 00 00 48 89 c1 >> 48 c1 e9 03 <80> 3c 31 00 0f 85 95 02 00 00 48 8b 30 49 89 d9 48 8b 4c >> 24 08 48 >> [ 827.526342][T37171] RSP: 0018:ffffc90028157ce8 EFLAGS: 00010256 >> [ 827.527480][T37171] RAX: 0000000000000000 RBX: ffffc90028157d68 RCX: >> 0000000000000000 >> [ 827.528942][T37171] RDX: 00007ffffffff000 RSI: dffffc0000000000 RDI: >> ffff88811dcd8444 >> [ 827.530406][T37171] RBP: 0000000000000003 R08: 0000000000000014 R09: >> ffff88811dcd8ad8 >> [ 827.531865][T37171] R10: ffffffff903e668f R11: 0000000000000000 R12: >> ffffc90028157e80 >> [ 827.533341][T37171] R13: ffff8881f3a2b0a8 R14: ffffc90028157e28 R15: >> ffffc90028157e88 >> [ 827.534806][T37171] FS: 00007f096d49f740(0000) >> GS:ffff8881f4a00000(0000) knlGS:0000000000000000 >> [ 827.536452][T37171] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> [ 827.537672][T37171] CR2: 00007ff2dcb96810 CR3: 00000001eed18000 CR4: >> 0000000000750ef0 >> [ 827.539135][T37171] PKRU: 55555554 >> [ 827.539799][T37171] Call Trace: >> [ 827.540407][T37171] <TASK> >> [ 827.540965][T37171] ? die_addr.cold+0x8/0xd >> [ 827.541823][T37171] ? exc_general_protection+0x147/0x240 >> [ 827.542888][T37171] ? asm_exc_general_protection+0x26/0x30 >> [ 827.543960][T37171] ? do_migrate_pages+0x404/0x6e0 >> [ 827.544915][T37171] ? do_migrate_pages+0x3cd/0x6e0 >> [ 827.545873][T37171] ? __pfx_do_migrate_pages+0x10/0x10 >> [ 827.546895][T37171] ? do_raw_spin_lock+0x12a/0x2b0 >> [ 827.547854][T37171] ? apparmor_capable+0x11c/0x3b0 >> [ 827.548818][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 >> [ 827.549878][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 >> [ 827.550937][T37171] ? security_capable+0x80/0x260 >> [ 827.551893][T37171] kernel_migrate_pages+0x5b7/0x750 >> [ 827.552891][T37171] ? __pfx_kernel_migrate_pages+0x10/0x10 >> [ 827.553975][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 >> [ 827.555028][T37171] ? rcu_is_watching+0x12/0xc0 >> [ 827.555938][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 >> [ 827.557000][T37171] __x64_sys_migrate_pages+0x96/0x100 >> [ 827.558022][T37171] ? srso_alias_return_thunk+0x5/0xfbef5 >> [ 827.559077][T37171] ? lockdep_hardirqs_on+0x7b/0x110 >> [ 827.560052][T37171] do_syscall_64+0xc7/0x250 >> [ 827.560909][T37171] entry_SYSCALL_64_after_hwframe+0x77/0x7f > > .. digging further, we call migrate_pages() with the pid of a process > we created using clone3(!CLONE_VM). > > The crashing code is likely: > > vma = find_vma(mm, 0); > 722c: e8 00 00 00 00 call 7231 <do_migrate_pages+0x3c1> > 7231: 48 8b 7c 24 28 mov 0x28(%rsp),%rdi > 7236: 31 f6 xor %esi,%esi > 7238: e8 00 00 00 00 call 723d <do_migrate_pages+0x3cd> > flags | MPOL_MF_DISCONTIG_OK, &pagelist); > 723d: 44 8b 44 24 3c mov 0x3c(%rsp),%r8d > nr_failed = queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask, > 7242: 48 8b 4c 24 40 mov 0x40(%rsp),%rcx > flags | MPOL_MF_DISCONTIG_OK, &pagelist); > 7247: 41 83 c8 10 or $0x10,%r8d > nr_failed = queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask, > 724b: 80 39 00 cmpb $0x0,(%rcx) > 724e: 4d 63 c0 movslq %r8d,%r8 > 7251: 0f 85 9b 02 00 00 jne 74f2 <do_migrate_pages+0x682> > 7257: 48 be 00 00 00 00 00 movabs $0xdffffc0000000000,%rsi > 725e: fc ff df > 7261: 48 8b 4c 24 28 mov 0x28(%rsp),%rcx > 7266: 48 8b 91 b0 00 00 00 mov 0xb0(%rcx),%rdx > 726d: 48 89 c1 mov %rax,%rcx > 7270: 48 c1 e9 03 shr $0x3,%rcx > 7274: 80 3c 31 00 cmpb $0x0,(%rcx,%rsi,1) > > <--- we seem toc rash here > > 7278: 0f 85 95 02 00 00 jne 7513 <do_migrate_pages+0x6a3> > 727e: 48 8b 30 mov (%rax),%rsi > 7281: 49 89 d9 mov %rbx,%r9 > 7284: 48 8b 4c 24 08 mov 0x8(%rsp),%rcx > 7289: 48 8b 7c 24 28 mov 0x28(%rsp),%rdi > 728e: e8 8d 9a ff ff call d20 <queue_pages_range> > 7293: 48 89 44 24 30 mov %rax,0x30(%rsp) > 7298: e9 c4 00 00 00 jmp 7361 <do_migrate_pages+0x4f1> > up_read(&mm->mmap_lock); > 729d: e8 00 00 00 00 call 72a2 <do_migrate_pages+0x432> > 72a2: 4c 89 ef mov %r13,%rdi > 72a5: e8 00 00 00 00 call 72aa <do_migrate_pages+0x43a> > > > Which would be do_migrate_pages()->migrate_to_node(): > > mmap_read_lock(mm); > vma = find_vma(mm, 0); > nr_failed = queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask, > flags | MPOL_MF_DISCONTIG_OK, &pagelist); > mmap_read_unlock(mm); > > ... and it seems to fail before calling queue_pages_range() :/ > > Did we, for some reason get a vma=NULL, because someone is concurrently tearing down the MM? I think that's exactly what's happening. Will send a fix after testing it. -- Cheers, David / dhildenb ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [syzbot] [mm?] general protection fault in do_migrate_pages 2024-11-20 0:00 [syzbot] [mm?] general protection fault in do_migrate_pages syzbot 2024-11-20 15:38 ` David Hildenbrand @ 2024-11-20 18:50 ` David Hildenbrand 2024-11-20 19:29 ` syzbot 1 sibling, 1 reply; 7+ messages in thread From: David Hildenbrand @ 2024-11-20 18:50 UTC (permalink / raw) To: syzbot, akpm, linux-kernel, linux-mm, syzkaller-bugs On 20.11.24 01:00, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: f868cd251776 Merge tag 'drm-fixes-2024-11-16' of https://g.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=15473cc0580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ff8e8187a30080b5 > dashboard link: https://syzkaller.appspot.com/bug?extid=3511625422f7aa637f0d > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e8d130580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159c71a7980000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/a0d46da55993/disk-f868cd25.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/da57ef4813fd/vmlinux-f868cd25.xz > kernel image: https://storage.googleapis.com/syzbot-assets/3cdde892ea08/bzImage-f868cd25.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+3511625422f7aa637f0d@syzkaller.appspotmail.com > > Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] > CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 > RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] > RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 > Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 > RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 > RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 > RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 > R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 > R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 > FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > kernel_migrate_pages+0x5b2/0x750 mm/mempolicy.c:1709 > __do_sys_migrate_pages mm/mempolicy.c:1727 [inline] > __se_sys_migrate_pages mm/mempolicy.c:1723 [inline] > __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1723 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fedcca74af9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffe4d85c278 EFLAGS: 00000206 ORIG_RAX: 0000000000000100 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fedcca74af9 > RDX: 0000000020000000 RSI: 000000000000005a RDI: 0000000000001786 > RBP: 0000000000010bf2 R08: 0000000000006080 R09: 0000000000000006 > R10: 0000000020000040 R11: 0000000000000206 R12: 00007ffe4d85c28c > R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] > RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 > Code: 8b 54 24 30 41 83 c8 10 80 3a 00 4d 63 c0 0f 85 d1 02 00 00 48 89 c1 48 8b 54 24 18 48 be 00 00 00 00 00 fc ff df 48 c1 e9 03 <80> 3c 31 00 48 8b 92 b0 00 00 00 0f 85 74 02 00 00 48 8b 30 49 89 > RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 > RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 > RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 > R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 > R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 > FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: 8b 54 24 30 mov 0x30(%rsp),%edx > 4: 41 83 c8 10 or $0x10,%r8d > 8: 80 3a 00 cmpb $0x0,(%rdx) > b: 4d 63 c0 movslq %r8d,%r8 > e: 0f 85 d1 02 00 00 jne 0x2e5 > 14: 48 89 c1 mov %rax,%rcx > 17: 48 8b 54 24 18 mov 0x18(%rsp),%rdx > 1c: 48 be 00 00 00 00 00 movabs $0xdffffc0000000000,%rsi > 23: fc ff df > 26: 48 c1 e9 03 shr $0x3,%rcx > * 2a: 80 3c 31 00 cmpb $0x0,(%rcx,%rsi,1) <-- trapping instruction > 2e: 48 8b 92 b0 00 00 00 mov 0xb0(%rdx),%rdx > 35: 0f 85 74 02 00 00 jne 0x2af > 3b: 48 8b 30 mov (%rax),%rsi > 3e: 49 rex.WB > 3f: 89 .byte 0x89 > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. #syz test: https://github.com/davidhildenbrand/linux.git mempolicy_vma -- Cheers, David / dhildenb ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [syzbot] [mm?] general protection fault in do_migrate_pages 2024-11-20 18:50 ` David Hildenbrand @ 2024-11-20 19:29 ` syzbot 0 siblings, 0 replies; 7+ messages in thread From: syzbot @ 2024-11-20 19:29 UTC (permalink / raw) To: akpm, david, linux-kernel, linux-mm, syzkaller-bugs Hello, syzbot has tested the proposed patch and the reproducer did not trigger any issue: Reported-by: syzbot+3511625422f7aa637f0d@syzkaller.appspotmail.com Tested-by: syzbot+3511625422f7aa637f0d@syzkaller.appspotmail.com Tested on: commit: ece1262a mm/mempolicy: fix migrate_to_node() assuming .. git tree: https://github.com/davidhildenbrand/linux.git mempolicy_vma console output: https://syzkaller.appspot.com/x/log.txt?x=1702bae8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f401cb14a38a8175 dashboard link: https://syzkaller.appspot.com/bug?extid=3511625422f7aa637f0d compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Note: no patches were applied. Note: testing is done by a robot and is best-effort only. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2024-11-20 19:29 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2024-11-20 0:00 [syzbot] [mm?] general protection fault in do_migrate_pages syzbot 2024-11-20 15:38 ` David Hildenbrand 2024-11-20 16:39 ` David Hildenbrand 2024-11-20 18:11 ` David Hildenbrand 2024-11-20 18:38 ` David Hildenbrand 2024-11-20 18:50 ` David Hildenbrand 2024-11-20 19:29 ` syzbot
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