WARNING in delayed_work_timer_fn (3)

Status: upstream: reported on 2025/08/15 19:10
Reported-by: syzbot+8aa7ee597d79feab5ef8@syzkaller.appspotmail.com
First crash: 371d, last: 44d
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in delayed_work_timer_fn arm -1 syz 312 197d 1156d 0/29 auto-obsoleted due to no activity on 2026/04/16 12:39
upstream WARNING in delayed_work_timer_fn (2) prio:low arm -1 46 22d 102d 0/29 upstream: reported on 2026/05/12 02:53
linux-6.1 WARNING in delayed_work_timer_fn (2) -1 35 504d 984d 0/3 auto-obsoleted due to no activity on 2025/07/13 12:01
linux-6.1 WARNING in delayed_work_timer_fn -1 2 1123d 1226d 0/3 auto-obsoleted due to no activity on 2023/11/02 17:34

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 15 at kernel/workqueue.c:1441 __queue_work+0xfe0/0x1280 kernel/workqueue.c:1441
Modules linked in:
CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 424000c5 (nZcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __queue_work+0xfe0/0x1280 kernel/workqueue.c:1441
lr : __queue_work+0xfe0/0x1280 kernel/workqueue.c:1441
sp : ffff80001cb97910
x29: ffff80001cb97950 x28: 1fffe00018136701 x27: dfff800000000000
x26: 0000000000000008 x25: 1fffe00018136701 x24: ffff0000d55d09c0
x23: 0000000000000000 x22: 0000000000000100 x21: ffff0000d55d0800
x20: 00000000000b0012 x19: ffff0000d37c0f70 x18: 1fffe00033e7277e
x17: 0000000000000000 x16: ffff800011b8ee98 x15: 0000000000000000
x14: 0000000000000002 x13: 1ffff00002a70071 x12: 00000000dea12b3b
x11: ff008000081f9578 x10: 0000000000000000 x9 : ffff8000081f9578
x8 : ffff0000c09b3800 x7 : ffff8000083bd714 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff800013d1cd80
x2 : ffff0000d37c0f70 x1 : 0000000000000100 x0 : 0000000000000000
Call trace:
 __queue_work+0xfe0/0x1280 kernel/workqueue.c:1441
 delayed_work_timer_fn+0x74/0x94 kernel/workqueue.c:1646
 call_timer_fn+0x1b8/0x96c kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1747 [inline]
 __run_timers+0x4d0/0x6d8 kernel/time/timer.c:2023
 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:2036
 handle_softirqs+0x318/0xc90 kernel/softirq.c:596
 run_ksoftirqd+0x7c/0x2ac kernel/softirq.c:968
 smpboot_thread_fn+0x4e8/0x960 kernel/smpboot.c:164
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
irq event stamp: 489973
hardirqs last  enabled at (489972): [<ffff800011c769d4>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (489972): [<ffff800011c769d4>] _raw_spin_unlock_irqrestore+0x48/0xac kernel/locking/spinlock.c:194
hardirqs last disabled at (489973): [<ffff800011c76838>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
hardirqs last disabled at (489973): [<ffff800011c76838>] _raw_spin_lock_irq+0x34/0x98 kernel/locking/spinlock.c:170
softirqs last  enabled at (489598): [<ffff8000081ae3b4>] softirq_handle_end kernel/softirq.c:439 [inline]
softirqs last  enabled at (489598): [<ffff8000081ae3b4>] handle_softirqs+0xb1c/0xc90 kernel/softirq.c:624
softirqs last disabled at (489605): [<ffff8000081b1364>] run_ksoftirqd+0x7c/0x2ac kernel/softirq.c:968
---[ end trace 0000000000000000 ]---

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/08 20:29 linux-6.1.y 090666d3cc90 88a4b44c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
2026/07/02 10:17 linux-6.1.y fdb6fcb41cc7 27192279 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
2026/06/25 22:22 linux-6.1.y fdb6fcb41cc7 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
2026/06/09 14:38 linux-6.1.y 228da13e907e c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
2026/03/28 16:38 linux-6.1.y 1989cd3d56e2 b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
2026/01/05 20:16 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
2025/11/09 17:29 linux-6.1.y f6e38ae624cf 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
2025/08/25 18:24 linux-6.1.y 0bc96de781b4 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
2025/08/21 05:35 linux-6.1.y 0bc96de781b4 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
2025/08/15 19:09 linux-6.1.y 0bc96de781b4 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in delayed_work_timer_fn
* Struck through repros no longer work on HEAD.