linux-kernel - Re: [syzbot] [f2fs?] kernel BUG in f2fs_write_end

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Message-ID: <5a259275-e284-49b5-80d4-929c60b5c1cc@kernel.org>
Date: Mon, 11 Aug 2025 19:41:04 +0800
From: Chao Yu <chao@...nel.org>
To: syzbot <syzbot+803dd716c4310d16ff3a@...kaller.appspotmail.com>,
 jaegeuk@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
 linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Cc: chao@...nel.org
Subject: Re: [syzbot] [f2fs?] kernel BUG in f2fs_write_end_io

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git bugfix/common

On 4/2/25 08:00, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    4e82c87058f4 Merge tag 'rust-6.15' of git://git.kernel.org..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17007198580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4253e469c0d32ef6
> dashboard link: https://syzkaller.appspot.com/bug?extid=803dd716c4310d16ff3a
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/5e6f1c2744e3/disk-4e82c870.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/5c1a60744d62/vmlinux-4e82c870.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/228bbd75bd12/bzImage-4e82c870.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+803dd716c4310d16ff3a@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> kernel BUG at fs/f2fs/data.c:358!
> Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
> CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted 6.14.0-syzkaller-10892-g4e82c87058f4 #0 PREEMPT(full) 
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
> RIP: 0010:f2fs_write_end_io+0x77a/0x790 fs/f2fs/data.c:357
> Code: e8 8b 01 f2 fd e9 a2 fa ff ff 89 d9 80 e1 07 38 c1 0f 8c fe fa ff ff 48 89 df e8 11 01 f2 fd e9 f1 fa ff ff e8 87 92 8b fd 90 <0f> 0b e8 8f d4 ed 07 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
> RSP: 0018:ffffc900001d79c0 EFLAGS: 00010246
> RAX: ffffffff8437d9e9 RBX: 0000000000000000 RCX: ffff88801da85a00
> RDX: 0000000000000100 RSI: 0000000000000000 RDI: 000000000000000a
> RBP: ffffc900001d7ac8 R08: ffffffff8437d696 R09: 1ffffd400012b785
> R10: dffffc0000000000 R11: fffff9400012b786 R12: 0000000000000001
> R13: dffffc0000000000 R14: 000000000000000a R15: ffffea000095bc00
> FS:  0000000000000000(0000) GS:ffff8881250e5000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fd1b21f9438 CR3: 000000007b684000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  blk_update_request+0x5e5/0x1160 block/blk-mq.c:983
>  blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1145
>  blk_complete_reqs block/blk-mq.c:1220 [inline]
>  blk_done_softirq+0x100/0x150 block/blk-mq.c:1225
>  handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579
>  run_ksoftirqd+0xcf/0x130 kernel/softirq.c:968
>  smpboot_thread_fn+0x576/0xaa0 kernel/smpboot.c:164
>  kthread+0x7b7/0x940 kernel/kthread.c:464
>  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>  </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:f2fs_write_end_io+0x77a/0x790 fs/f2fs/data.c:357
> Code: e8 8b 01 f2 fd e9 a2 fa ff ff 89 d9 80 e1 07 38 c1 0f 8c fe fa ff ff 48 89 df e8 11 01 f2 fd e9 f1 fa ff ff e8 87 92 8b fd 90 <0f> 0b e8 8f d4 ed 07 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
> RSP: 0018:ffffc900001d79c0 EFLAGS: 00010246
> RAX: ffffffff8437d9e9 RBX: 0000000000000000 RCX: ffff88801da85a00
> RDX: 0000000000000100 RSI: 0000000000000000 RDI: 000000000000000a
> RBP: ffffc900001d7ac8 R08: ffffffff8437d696 R09: 1ffffd400012b785
> R10: dffffc0000000000 R11: fffff9400012b786 R12: 0000000000000001
> R13: dffffc0000000000 R14: 000000000000000a R15: ffffea000095bc00
> FS:  0000000000000000(0000) GS:ffff8881250e5000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fd1b21f9438 CR3: 000000007b684000 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@...glegroups.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
> 
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> (See the list of subsystem names on the web dashboard)
> 
> If the report is a duplicate of another one, reply with:
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> 
> If you want to undo deduplication, reply with:
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