Re: [syzbot] [btrfs?] kernel BUG in __folio_start_writeback

[Qu Wenruo <wqu@suse.com>]

#syz test: https://github.com/btrfs/linux.git for-next

在 2024/11/25 00:15, syzbot 写道:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    228a1157fb9f Merge tag '6.13-rc-part1-SMB3-client-fixes' o..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13820530580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=402159daa216c89d
> dashboard link: https://syzkaller.appspot.com/bug?extid=aac7bff85be224de5156
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13840778580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17840778580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/d32a8e8c5aae/disk-228a1157.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/28d5c070092e/vmlinux-228a1157.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/45af4bfd9e8e/bzImage-228a1157.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/69603aa12e8f/mount_0.gz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+aac7bff85be224de5156@syzkaller.appspotmail.com
> 
>   __fput+0x5ba/0xa50 fs/file_table.c:458
>   task_work_run+0x24f/0x310 kernel/task_work.c:239
>   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
>   exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
>   exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
>   __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>   syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
>   do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
>   entry_SYSCALL_64_after_hwframe+0x77/0x7f
> ------------[ cut here ]------------
> kernel BUG at mm/page-writeback.c:3119!
> Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
> CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:1 Not tainted 6.12.0-syzkaller-08446-g228a1157fb9f #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
> Workqueue: btrfs-delalloc btrfs_work_helper
> RIP: 0010:__folio_start_writeback+0xc06/0x1050 mm/page-writeback.c:3119
> Code: 25 ff 0f 00 00 0f 84 d3 00 00 00 e8 14 ae c3 ff e9 ba f5 ff ff e8 0a ae c3 ff 4c 89 f7 48 c7 c6 00 2e 14 8c e8 8b 4f 0d 00 90 <0f> 0b e8 f3 ad c3 ff 4c 89 f7 48 c7 c6 60 34 14 8c e8 74 4f 0d 00
> RSP: 0018:ffffc90000117500 EFLAGS: 00010246
> RAX: ed413247a2060f00 RBX: 0000000000000002 RCX: 0000000000000001
> RDX: dffffc0000000000 RSI: ffffffff8c0ad620 RDI: 0000000000000001
> RBP: ffffc90000117670 R08: ffffffff942b2967 R09: 1ffffffff285652c
> R10: dffffc0000000000 R11: fffffbfff285652d R12: 0000000000000000
> R13: 1ffff92000022eac R14: ffffea0001cab940 R15: ffff888077139710
> FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f6661870000 CR3: 00000000792b2000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   process_one_folio fs/btrfs/extent_io.c:187 [inline]
>   __process_folios_contig+0x31c/0x540 fs/btrfs/extent_io.c:216
>   submit_one_async_extent fs/btrfs/inode.c:1229 [inline]
>   submit_compressed_extents+0xdb3/0x16e0 fs/btrfs/inode.c:1632
>   run_ordered_work fs/btrfs/async-thread.c:245 [inline]
>   btrfs_work_helper+0x56b/0xc50 fs/btrfs/async-thread.c:324
>   process_one_work kernel/workqueue.c:3229 [inline]
>   process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
>   worker_thread+0x870/0xd30 kernel/workqueue.c:3391
>   kthread+0x2f0/0x390 kernel/kthread.c:389
>   ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>   </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:__folio_start_writeback+0xc06/0x1050 mm/page-writeback.c:3119
> Code: 25 ff 0f 00 00 0f 84 d3 00 00 00 e8 14 ae c3 ff e9 ba f5 ff ff e8 0a ae c3 ff 4c 89 f7 48 c7 c6 00 2e 14 8c e8 8b 4f 0d 00 90 <0f> 0b e8 f3 ad c3 ff 4c 89 f7 48 c7 c6 60 34 14 8c e8 74 4f 0d 00
> RSP: 0018:ffffc90000117500 EFLAGS: 00010246
> RAX: ed413247a2060f00 RBX: 0000000000000002 RCX: 0000000000000001
> RDX: dffffc0000000000 RSI: ffffffff8c0ad620 RDI: 0000000000000001
> RBP: ffffc90000117670 R08: ffffffff942b2967 R09: 1ffffffff285652c
> R10: dffffc0000000000 R11: fffffbfff285652d R12: 0000000000000000
> R13: 1ffff92000022eac R14: ffffea0001cab940 R15: ffff888077139710
> FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055ec8463e668 CR3: 000000007ed5e000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> 
> 
> ---
> 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
>