[syzbot] WARNING in btrfs_put_transaction

[syzbot] WARNING in btrfs_put_transaction

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    644e9524388a Merge tag 'for-v6.1-rc' of git://git.kernel.o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=134bee03880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8d01b6e3197974dd
dashboard link: https://syzkaller.appspot.com/bug?extid=3706b1df47f2464f0c1e
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1476f2c3880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17e6e3c9880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0968428e17b4/disk-644e9524.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fd4c3bfd0777/vmlinux-644e9524.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ee4571f27f1c/bzImage-644e9524.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/68219d51df73/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3706b1df47f2464f0c1e@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 3706 at fs/btrfs/transaction.c:132 btrfs_put_transaction+0x377/0x3d0
Modules linked in:
CPU: 0 PID: 3706 Comm: btrfs-transacti Not tainted 6.1.0-rc6-syzkaller-00308-g644e9524388a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:btrfs_put_transaction+0x377/0x3d0 fs/btrfs/transaction.c:131
Code: da 31 c0 e8 bd 56 09 07 e9 e5 fd ff ff e8 a1 a1 03 fe 0f 0b e9 f7 fc ff ff e8 95 a1 03 fe 0f 0b e9 69 fd ff ff e8 89 a1 03 fe <0f> 0b e9 89 fd ff ff e8 7d a1 03 fe 4c 89 ff be 03 00 00 00 48 83
RSP: 0018:ffffc90003fefbf8 EFLAGS: 00010293
RAX: ffffffff8386f627 RBX: ffff8880188b3330 RCX: ffff8880799eba80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff8880188b3000 R08: ffffffff8386f330 R09: ffffed1003116603
R10: ffffed1003116603 R11: 1ffff11003116602 R12: ffff8880188b3028
R13: dffffc0000000000 R14: ffff888027cecce8 R15: ffff8880188b3010
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b2eb954e90 CR3: 0000000027fcd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_cleanup_transaction+0x55b/0x1b60 fs/btrfs/disk-io.c:5237
 transaction_kthread+0x3f5/0x490 fs/btrfs/disk-io.c:1913
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>


---
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Re: [syzbot] WARNING in btrfs_put_transaction

[David Sterba]

On Wed, Nov 30, 2022 at 11:58:38AM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    644e9524388a Merge tag 'for-v6.1-rc' of git://git.kernel.o..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=134bee03880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8d01b6e3197974dd
> dashboard link: https://syzkaller.appspot.com/bug?extid=3706b1df47f2464f0c1e
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1476f2c3880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17e6e3c9880000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/0968428e17b4/disk-644e9524.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/fd4c3bfd0777/vmlinux-644e9524.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/ee4571f27f1c/bzImage-644e9524.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/68219d51df73/mount_0.gz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+3706b1df47f2464f0c1e@syzkaller.appspotmail.com
> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 3706 at fs/btrfs/transaction.c:132 btrfs_put_transaction+0x377/0x3d0

That was an injected ENOMEM that then hit a transaction abort, we used
to print a full trace on that but it's been silenced.

#syz fix: btrfs: don't print stack trace when transaction is aborted due to ENOMEM