linux-kernel - Re: [syzbot] [btrfs?] WARNING in __btrfs_free

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Message-ID: <aa2e3dba-9729-4b6b-94a5-36075d57ca7f@gmx.com>
Date: Sun, 1 Sep 2024 08:03:29 +0930
From: Qu Wenruo <quwenruo.btrfs@....com>
To: syzbot <syzbot+480676efc0c3a76b5214@...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] [btrfs?] WARNING in __btrfs_free_extent (3)



在 2024/9/1 03:29, syzbot 写道:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    86987d84b968 Merge tag 'v6.11-rc5-client-fixes' of git://g..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=109f1425980000

I was checking the console and trying to find out what's before the
transaction abort.

The error number means it's ENOENT thus it seems to be a missing extent
item or whatever.

But the console output contains not even the WARNING line, is the
console output trimmed or whatever?

Thanks,
Qu

> kernel config:  https://syzkaller.appspot.com/x/.config?x=a0455552d0b27491
> dashboard link: https://syzkaller.appspot.com/bug?extid=480676efc0c3a76b5214
> 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/87692913ef45/disk-86987d84.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/a27da6973d7f/vmlinux-86987d84.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/2e28d02ce725/bzImage-86987d84.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+480676efc0c3a76b5214@...kaller.appspotmail.com
>
> ------------[ cut here ]------------
> BTRFS: Transaction aborted (error -2)
> WARNING: CPU: 1 PID: 63 at fs/btrfs/extent-tree.c:2972 do_free_extent_accounting fs/btrfs/extent-tree.c:2972 [inline]
> WARNING: CPU: 1 PID: 63 at fs/btrfs/extent-tree.c:2972 __btrfs_free_extent+0x32d1/0x3a10 fs/btrfs/extent-tree.c:3346
> Modules linked in:
> CPU: 1 UID: 0 PID: 63 Comm: kworker/u8:4 Not tainted 6.11.0-rc5-syzkaller-00057-g86987d84b968 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
> Workqueue: events_unbound btrfs_async_reclaim_metadata_space
> RIP: 0010:do_free_extent_accounting fs/btrfs/extent-tree.c:2972 [inline]
> RIP: 0010:__btrfs_free_extent+0x32d1/0x3a10 fs/btrfs/extent-tree.c:3346
> Code: e8 24 a4 ae fd 90 0f 0b 90 90 e9 3c f3 ff ff e8 35 80 ec fd 90 48 c7 c7 00 79 2b 8c 44 8b 6c 24 18 44 89 ee e8 00 a4 ae fd 90 <0f> 0b 90 90 4c 8b 24 24 e9 4f f3 ff ff e8 0d 80 ec fd 90 48 c7 c7
> RSP: 0018:ffffc900015e6f80 EFLAGS: 00010246
> RAX: ec2b4374561a8400 RBX: ffff88805d790001 RCX: ffff888015581e00
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
> RBP: ffffc900015e7150 R08: ffffffff8155b212 R09: fffffbfff1cba0e0
> R10: dffffc0000000000 R11: fffffbfff1cba0e0 R12: dffffc0000000000
> R13: 00000000fffffffe R14: 0000000000000000 R15: ffff88805d3be5c8
> FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f3dca9f0270 CR3: 000000002dd02000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   run_delayed_tree_ref fs/btrfs/extent-tree.c:1724 [inline]
>   run_one_delayed_ref fs/btrfs/extent-tree.c:1750 [inline]
>   btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2015 [inline]
>   __btrfs_run_delayed_refs+0x112e/0x4680 fs/btrfs/extent-tree.c:2085
>   btrfs_run_delayed_refs+0xe3/0x2c0 fs/btrfs/extent-tree.c:2197
>   btrfs_commit_transaction+0x4be/0x3740 fs/btrfs/transaction.c:2198
>   flush_space+0x19c/0xd00 fs/btrfs/space-info.c:835
>   btrfs_async_reclaim_metadata_space+0x6dc/0x840 fs/btrfs/space-info.c:1106
>   process_one_work kernel/workqueue.c:3231 [inline]
>   process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
>   worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
>   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>
>
>
> ---
> 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:
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>
> If the report is already addressed, let syzbot know by replying with:
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>
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>
> If the report is a duplicate of another one, reply with:
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>
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>