linux-kernel - [syzbot] [btrfs?] WARNING in btrfs_put

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Message-ID: <68a7384b.050a0220.3d78fd.002c.GAE@google.com>
Date: Thu, 21 Aug 2025 08:16:27 -0700
From: syzbot <syzbot+62f59a3655c0df0581cd@...kaller.appspotmail.com>
To: clm@...com, dsterba@...e.com, josef@...icpanda.com, 
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [btrfs?] WARNING in btrfs_put_transaction (4)

Hello,

syzbot found the following issue on:

HEAD commit:    8f5ae30d69d7 Linux 6.17-rc1
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=13792ba2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb
dashboard link: https://syzkaller.appspot.com/bug?extid=62f59a3655c0df0581cd
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+62f59a3655c0df0581cd@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 7838 at fs/btrfs/transaction.c:144 btrfs_put_transaction+0x4b8/0x520 fs/btrfs/transaction.c:144
Modules linked in:
CPU: 1 UID: 0 PID: 7838 Comm: btrfs-transacti Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : btrfs_put_transaction+0x4b8/0x520 fs/btrfs/transaction.c:144
lr : btrfs_put_transaction+0x4b8/0x520 fs/btrfs/transaction.c:144
sp : ffff8000b41a7a70
x29: ffff8000b41a7a80 x28: 1fffe0001f3374a0 x27: dfff800000000000
x26: ffff0000c621a000 x25: dfff800000000000 x24: 1fffe00018c43404
x23: ffff0000c621a000 x22: ffff0000f99b8d38 x21: 0000000000000001
x20: ffff0000c621a358 x19: ffff0000dfc5b2a4 x18: 00000000ffffffff
x17: ffff800093507000 x16: ffff800080535980 x15: 0000000000000001
x14: 1fffe00018c43402 x13: 0000000000000000 x12: 0000000000000000
x11: ffff600018c43403 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000e01edb80 x7 : ffff80008235f5e4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800082358eec
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000001
Call trace:
 btrfs_put_transaction+0x4b8/0x520 fs/btrfs/transaction.c:144 (P)
 btrfs_commit_transaction+0x1d24/0x2ce4 fs/btrfs/transaction.c:2583
 transaction_kthread+0x200/0x430 fs/btrfs/disk-io.c:1592
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
irq event stamp: 123680
hardirqs last  enabled at (123679): [<ffff80008b028df8>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (123679): [<ffff80008b028df8>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194
hardirqs last disabled at (123680): [<ffff80008b001bfc>] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574
softirqs last  enabled at (123658): [<ffff800080201608>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (123656): [<ffff8000802015d4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---


---
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