Message-ID: <03e95a73-6c8a-47b0-9b72-c1204118be47@gmx.com>
Date: Sun, 23 Mar 2025 16:27:29 +1030
From: Qu Wenruo <quwenruo.btrfs@....com>
To: syzbot <syzbot+2665d678fffcc4608e18@...kaller.appspotmail.com>,
 clm@...com, dsterba@...e.com, josef@...icpanda.com,
 linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] kernel BUG in close_ctree

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


在 2022/11/23 18:40, syzbot 写道:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    eb7081409f94 Linux 6.1-rc6
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17e5b309880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5db36e7087dcccae
> dashboard link: https://syzkaller.appspot.com/bug?extid=2665d678fffcc4608e18
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/12e9c825ff47/disk-eb708140.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/107e5e091c9e/vmlinux-eb708140.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/605ab211617d/bzImage-eb708140.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+2665d678fffcc4608e18@...kaller.appspotmail.com
>
> assertion failed: list_empty(&fs_info->delayed_iputs), in fs/btrfs/disk-io.c:4664
> ------------[ cut here ]------------
> kernel BUG at fs/btrfs/ctree.h:3713!
> invalid opcode: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 3696 Comm: syz-executor.2 Not tainted 6.1.0-rc6-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
> RIP: 0010:assertfail.constprop.0+0x27/0x29 fs/btrfs/ctree.h:3713
> Code: 3f c9 f7 41 54 41 89 f4 55 48 89 fd e8 a2 3f c9 f7 44 89 e1 48 89 ee 48 c7 c2 60 a4 95 8a 48 c7 c7 a0 a4 95 8a e8 00 76 f5 ff <0f> 0b e8 82 3f c9 f7 e8 8d 3d 15 f8 be 73 04 00 00 48 c7 c7 40 a5
> RSP: 0018:ffffc90003727be8 EFLAGS: 00010282
> RAX: 0000000000000051 RBX: ffff888027d9c000 RCX: 0000000000000000
> RDX: ffff88804a6b6280 RSI: ffffffff8164973c RDI: fffff520006e4f6f
> RBP: ffffffff8a95dac0 R08: 0000000000000051 R09: 0000000000000000
> R10: 0000000080000000 R11: 0000000000000000 R12: 0000000000001238
> R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801da29200
> FS:  0000555555bec400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f17654d56be CR3: 0000000031a82000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   close_ctree+0x502/0xdc7 fs/btrfs/disk-io.c:4664
>   generic_shutdown_super+0x158/0x410 fs/super.c:492
>   kill_anon_super+0x3a/0x60 fs/super.c:1086
>   btrfs_kill_super+0x3c/0x50 fs/btrfs/super.c:2441
>   deactivate_locked_super+0x98/0x160 fs/super.c:332
>   deactivate_super+0xb1/0xd0 fs/super.c:363
>   cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1186
>   task_work_run+0x16f/0x270 kernel/task_work.c:179
>   resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
>   exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
>   exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203
>   __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
>   syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
>   do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f7827a8d5f7
> Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 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:00007ffeef557068 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f7827a8d5f7
> RDX: 00007ffeef55713c RSI: 000000000000000a RDI: 00007ffeef557130
> RBP: 00007ffeef557130 R08: 00000000ffffffff R09: 00007ffeef556f00
> R10: 0000555555bed8b3 R11: 0000000000000246 R12: 00007f7827ae6b46
> R13: 00007ffeef5581f0 R14: 0000555555bed810 R15: 00007ffeef558230
>   </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:assertfail.constprop.0+0x27/0x29 fs/btrfs/ctree.h:3713
> Code: 3f c9 f7 41 54 41 89 f4 55 48 89 fd e8 a2 3f c9 f7 44 89 e1 48 89 ee 48 c7 c2 60 a4 95 8a 48 c7 c7 a0 a4 95 8a e8 00 76 f5 ff <0f> 0b e8 82 3f c9 f7 e8 8d 3d 15 f8 be 73 04 00 00 48 c7 c7 40 a5
> RSP: 0018:ffffc90003727be8 EFLAGS: 00010282
> RAX: 0000000000000051 RBX: ffff888027d9c000 RCX: 0000000000000000
> RDX: ffff88804a6b6280 RSI: ffffffff8164973c RDI: fffff520006e4f6f
> RBP: ffffffff8a95dac0 R08: 0000000000000051 R09: 0000000000000000
> R10: 0000000080000000 R11: 0000000000000000 R12: 0000000000001238
> R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801da29200
> FS:  0000555555bec400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fd78dea19d8 CR3: 0000000031a82000 CR4: 00000000003506e0
> 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.
>

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