WARNING in btrfs_add_delayed

WARNING in btrfs_add_delayed_iput

Status: upstream: reported on 2025/06/04 13:20
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+0ed30ad435bf6f5b7a42@syzkaller.appspotmail.com
Fix commit: a26bf338cdad btrfs: fix race between async reclaim worker and close_ctree()
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-riscv64 ci2-upstream-usb]
First crash: 33d, last: 33d

▶ ▼ Discussions (1)

Title	Replies (including bot)	Last reply
[syzbot] [btrfs?] WARNING in btrfs_add_delayed_iput	0 (1)	2025/06/04 13:20

Sample crash report:

------------[ cut here ]------------
WARNING: CPU: 0 PID: 65 at fs/btrfs/inode.c:3420 btrfs_add_delayed_iput+0x2f8/0x370 fs/btrfs/inode.c:3420
Modules linked in:
CPU: 0 UID: 0 PID: 65 Comm: kworker/u8:4 Not tainted 6.15.0-next-20250530-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: btrfs-endio-write btrfs_work_helper
RIP: 0010:btrfs_add_delayed_iput+0x2f8/0x370 fs/btrfs/inode.c:3420
Code: 4e ad 5d fe 48 8b 3b 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 f8 bc ca fd e8 03 2a fa fd e9 e6 fd ff ff e8 f9 29 fa fd 90 <0f> 0b 90 e9 41 fe ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 72
RSP: 0018:ffffc9000213f780 EFLAGS: 00010293
RAX: ffffffff83c635b7 RBX: ffff888058920000 RCX: ffff88801c769e00
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff888058921b67 R09: 1ffff1100b12436c
R10: dffffc0000000000 R11: ffffed100b12436d R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88807d748000 R15: 0000000000000100
FS:  0000000000000000(0000) GS:ffff888125c53000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000bd038 CR3: 000000006a142000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_put_ordered_extent+0x19f/0x470 fs/btrfs/ordered-data.c:635
 btrfs_finish_one_ordered+0x11d8/0x1b10 fs/btrfs/inode.c:3312
 btrfs_work_helper+0x399/0xc20 fs/btrfs/async-thread.c:312
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/05/31 13:09	linux-next	3a83b350b5be	3d2f584d	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-linux-next-kasan-gce-root	WARNING in btrfs_add_delayed_iput

* ~~Struck through~~ repros no longer work on HEAD.