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[2003:cb:c705:4200:ce79:acf6:d832:60df]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-382549052aasm2356382f8f.19.2024.11.20.07.38.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 20 Nov 2024 07:38:13 -0800 (PST) Message-ID: <13aa3ca2-00a3-4b9f-a052-261d873f017d@redhat.com> Date: Wed, 20 Nov 2024 16:38:11 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] general protection fault in do_migrate_pages To: syzbot , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com References: <673d2696.050a0220.3c9d61.012f.GAE@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK 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ukHFLtTTBg4f1TBpczrmrZdpAaQ0U8untddExLcc4pUjUrsbat7oR4ppIFBvhXw+qXOGA5HY8CU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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: > > 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 > > 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