syzbot


WARNING in btrfs_add_delayed_iput (3)

Status: upstream: reported on 2026/06/02 14:13
Subsystems: btrfs
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+6a843bf8604711c8fab0@syzkaller.appspotmail.com
First crash: 19d, last: 8h25m
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
686b376d-958d-4b7d-9c35-8e870cb8b67f assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in btrfs_add_delayed_iput (3) 2026/06/02 18:47 2026/06/02 18:47 2026/06/02 19:47 62fe15281f5011cd203d8845b8767b10e7443aa5

			
		
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [btrfs?] WARNING in btrfs_add_delayed_iput (3) 0 (1) 2026/06/02 14:13
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in btrfs_add_delayed_iput btrfs -1 2 342d 378d 29/29 fixed on 2025/09/04 16:57
upstream WARNING in btrfs_add_delayed_iput (2) btrfs -1 7 198d 234d 0/29 auto-obsoleted due to no activity on 2026/03/12 00:28

Sample crash report:
------------[ cut here ]------------
test_bit(BTRFS_FS_STATE_NO_DELAYED_IPUT, &fs_info->fs_state)
WARNING: fs/btrfs/inode.c:3419 at btrfs_add_delayed_iput+0x2e0/0x340 fs/btrfs/inode.c:3419, CPU#0: kworker/u8:0/12
Modules linked in:
CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: btrfs-endio-write btrfs_work_helper
RIP: 0010:btrfs_add_delayed_iput+0x2e0/0x340 fs/btrfs/inode.c:3419
Code: 96 6a 44 fe 48 8b 3b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 a0 ea a9 fd e8 cb 64 db fd e9 f8 fd ff ff e8 c1 64 db fd 90 <0f> 0b 90 e9 52 fe ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 84
RSP: 0018:ffffc90000117808 EFLAGS: 00010293
RAX: ffffffff83e9829f RBX: ffff8880353f0000 RCX: ffff88801ce80000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1006a7e4a6 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff8880690a4788 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff88812615d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f02ecb394e8 CR3: 000000006292e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 btrfs_put_ordered_extent+0x18a/0x420 fs/btrfs/ordered-data.c:642
 btrfs_finish_one_ordered+0xf7f/0x1f00 fs/btrfs/inode.c:3256
 btrfs_work_helper+0x338/0xc30 fs/btrfs/async-thread.c:312
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/17 21:50 upstream 66affa37cfac b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_add_delayed_iput
2026/06/15 19:17 upstream 0e0611827f33 50bb0618 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_add_delayed_iput
2026/06/09 05:15 upstream 4549871118cf 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in btrfs_add_delayed_iput
2026/05/29 14:10 upstream 8fde5d1d47f6 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_add_delayed_iput
* Struck through repros no longer work on HEAD.