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

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Message-ID: <000000000000e29eee05fc64378e@google.com>
Date:   Tue, 23 May 2023 15:50:48 -0700
From:   syzbot <syzbot+dafbca0e20fbc5946925@...kaller.appspotmail.com>
To:     clm@...com, dsterba@...e.com, josef@...icpanda.com,
        linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] WARNING in btrfs_commit_transaction (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    ae8373a5add4 Merge tag 'x86_urgent_for_6.4-rc4' of git://g..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17b3b489280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f389ffdf4e9ba3f0
dashboard link: https://syzkaller.appspot.com/bug?extid=dafbca0e20fbc5946925
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14243ef9280000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16c06772280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2c5ee189dd12/disk-ae8373a5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/63acf75623d7/vmlinux-ae8373a5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/29de65c99e9d/bzImage-ae8373a5.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2eac0114b435/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dafbca0e20fbc5946925@...kaller.appspotmail.com

BTRFS warning (device loop0): Skipping commit of aborted transaction.
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 41 at fs/btrfs/transaction.c:1978 cleanup_transaction fs/btrfs/transaction.c:1978 [inline]
WARNING: CPU: 0 PID: 41 at fs/btrfs/transaction.c:1978 btrfs_commit_transaction+0x3223/0x3fa0 fs/btrfs/transaction.c:2565
Modules linked in:
CPU: 0 PID: 41 Comm: kworker/u4:2 Not tainted 6.4.0-rc3-syzkaller-00008-gae8373a5add4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:cleanup_transaction fs/btrfs/transaction.c:1978 [inline]
RIP: 0010:btrfs_commit_transaction+0x3223/0x3fa0 fs/btrfs/transaction.c:2565
Code: c8 fe ff ff be 02 00 00 00 e8 f9 41 aa 00 e9 21 d3 ff ff e8 af 68 1b fe 8b b5 20 ff ff ff 48 c7 c7 c0 25 95 8a e8 2d 28 e3 fd <0f> 0b c7 85 00 ff ff ff 01 00 00 00 e9 97 df ff ff e8 87 68 1b fe
RSP: 0018:ffffc90000b27990 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 000000001f0d8001 RCX: 0000000000000000
RDX: ffff888014aa0000 RSI: ffffffff814c03e7 RDI: 0000000000000001
RBP: ffffc90000b27b00 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88801f0d8000
R13: ffff888074df3e98 R14: ffff888074df4000 R15: ffff88801f0d8000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bc77452c28 CR3: 0000000072dfb000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 flush_space+0x1e0/0xde0 fs/btrfs/space-info.c:808
 btrfs_async_reclaim_metadata_space+0x39e/0xa90 fs/btrfs/space-info.c:1078
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>


---
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.