* [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
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If you want to overwrite report's subsystems, reply with:
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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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