syzbot


WARNING in btrfs_put_transaction (5)

Status: upstream: reported on 2026/01/06 01:02
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+6d30e046bbd449d3f6f1@syzkaller.appspotmail.com
First crash: 10d, last: 10d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [btrfs?] WARNING in btrfs_put_transaction (5) 1 (2) 2026/01/06 10:47
Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in btrfs_put_transaction (4) btrfs -1 1 147d 143d 0/29 auto-obsoleted due to no activity on 2025/11/25 15:10
upstream WARNING in btrfs_put_transaction (3) btrfs -1 1 417d 413d 0/29 auto-obsoleted due to no activity on 2025/02/28 14:39
upstream WARNING in btrfs_put_transaction btrfs -1 C error inconclusive 83 616d 1138d 25/29 fixed on 2024/05/22 09:57
upstream WARNING in btrfs_put_transaction (2) btrfs -1 3 591d 587d 26/29 fixed on 2024/07/09 19:14
linux-5.15 WARNING in btrfs_put_transaction origin:lts-only -1 syz unreliable 5 723d 915d 0/3 auto-obsoleted due to no activity on 2024/10/09 03:47
linux-6.1 WARNING in btrfs_put_transaction -1 2 927d 1008d 0/3 auto-obsoleted due to no activity on 2023/10/07 17:45

Sample crash report:
------------[ cut here ]------------
WARNING: fs/btrfs/transaction.c:145 at btrfs_put_transaction+0x52d/0x560 fs/btrfs/transaction.c:145, CPU#0: btrfs-transacti/1033
Modules linked in:
CPU: 0 UID: 0 PID: 1033 Comm: btrfs-transacti Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:btrfs_put_transaction+0x52d/0x560 fs/btrfs/transaction.c:145
Code: 07 fc ff ff e8 94 2a f1 fd 4c 89 f7 be 03 00 00 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 b9 1b be 00 e8 74 2a f1 fd 90 <0f> 0b 90 e9 6f fb ff ff e8 66 2a f1 fd 90 0f 0b 90 e9 8c fb ff ff
RSP: 0018:ffffc900052e7970 EFLAGS: 00010293
RAX: ffffffff83cfcd4c RBX: ffff8880a4cba000 RCX: ffff888034bf3d00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffff8880a4cba013 R09: 1ffff11014997402
R10: dffffc0000000000 R11: ffffed1014997403 R12: ffff8880a4cba000
R13: 0000000000000000 R14: ffff8880a4cba358 R15: ffff88803251cc88
FS:  0000000000000000(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffde9f8b92c CR3: 000000000dd3a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 btrfs_commit_transaction+0x22cf/0x3b10 fs/btrfs/transaction.c:2598
 transaction_kthread+0x2b1/0x450 fs/btrfs/disk-io.c:1587
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/02 01:00 upstream b69053dd3ffb d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in btrfs_put_transaction
* Struck through repros no longer work on HEAD.