BUG: soft lockup in __run_timers

Status: auto-obsoleted due to no activity on 2023/05/06 12:08
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+89e77dc58c734e327c44@syzkaller.appspotmail.com
First crash: 1275d, last: 1275d
▶ ▼ Similar bugs (13)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 BUG: soft lockup in __run_timers 1 2 713d 782d 0/2 auto-obsoleted due to no activity on 2024/11/18 04:44
android-54 BUG: soft lockup in __run_timers 1 1 766d 766d 0/2 auto-obsoleted due to no activity on 2024/09/26 00:22
android-5-15 BUG: soft lockup in __run_timers 1 1 684d 684d 0/2 auto-obsoleted due to no activity on 2024/12/16 23:50
android-54 BUG: soft lockup in __run_timers (2) 1 2 486d 548d 0/2 auto-obsoleted due to no activity on 2025/07/03 11:27
upstream INFO: rcu detected stall in __run_timers (5) kernel 1 syz, C error error 63 1644d 2158d 0/29 closed as invalid on 2022/02/08 10:39
upstream INFO: rcu detected stall in __run_timers (8) prio:normal kernel 1 1 93d 93d 0/29 auto-obsoleted due to no activity on 2026/07/31 00:54
linux-5.15 INFO: rcu detected stall in __run_timers 1 1 1203d 1203d 0/3 auto-obsoleted due to no activity on 2023/08/15 19:18
linux-6.1 INFO: rcu detected stall in __run_timers (2) origin:upstream 1 syz error 3 10d 295d 0/3 upstream: reported syz repro on 2025/10/12 10:55
upstream INFO: rcu detected stall in __run_timers (7) kernfs 1 25 693d 797d 0/29 auto-obsoleted due to no activity on 2024/11/08 17:44
linux-6.1 INFO: rcu detected stall in __run_timers 1 1 651d 651d 0/3 auto-obsoleted due to no activity on 2025/01/28 16:20
upstream INFO: rcu detected stall in __run_timers (6) kernel 1 2 1612d 1629d 0/29 auto-closed as invalid on 2022/06/02 21:46
linux-5.15 INFO: rcu detected stall in __run_timers (2) 1 9 4d04h 334d 0/3 upstream: reported on 2025/09/03 11:07
linux-6.6 INFO: rcu detected stall in __run_timers 1 2 15d 54d 0/2 upstream: reported on 2026/06/10 07:15

Sample crash report:
watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [ksoftirqd/0:14]
Modules linked in:
irq event stamp: 49149847
hardirqs last  enabled at (49149846): [<ffff80000c13db94>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
hardirqs last  enabled at (49149846): [<ffff80000c13db94>] _raw_spin_unlock_irq+0x3c/0x6c kernel/locking/spinlock.c:202
hardirqs last disabled at (49149847): [<ffff80000c12aa78>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
hardirqs last disabled at (49149847): [<ffff80000c12aa78>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:486
softirqs last  enabled at (39945482): [<ffff8000080102c4>] _stext+0x2c4/0x34c
softirqs last disabled at (39945511): [<ffff80000810dfd8>] run_ksoftirqd+0x40/0x108 kernel/softirq.c:934
CPU: 0 PID: 14 Comm: ksoftirqd/0 Not tainted 6.2.0-rc6-syzkaller-17549-gca72d58361ee #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
pc : _raw_spin_unlock_irq+0x40/0x6c kernel/locking/spinlock.c:202
lr : __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
lr : _raw_spin_unlock_irq+0x3c/0x6c kernel/locking/spinlock.c:202
sp : ffff80000f4abc80
x29: ffff80000f4abc80 x28: dead000000000122 x27: ffff80000f4abcb8
x26: 000000000a400000 x25: 0000000000000000 x24: ffff80000b3d4a58
x23: ffff0001334b8210 x22: 000000010001b8a9 x21: 0000000000000000
x20: ffff80000c1808a0 x19: ffff0001fefc0980 x18: 000000007c11071d
x17: 00000000d92a1f29 x16: ffff80000ddcb118 x15: ffff0000c0319a00
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c0319a00
x11: ff808000095ef9f4 x10: 0000000000000000 x9 : ffff8000095ef9f4
x8 : 0000000002edf796 x7 : ffff8000095f0948 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff80000f4abc18 x1 : ffff80000d089ee7 x0 : ffff8001f1b0c000
Call trace:
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:33 [inline]
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:55 [inline]
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
 _raw_spin_unlock_irq+0x40/0x6c kernel/locking/spinlock.c:202
 expire_timers kernel/time/timer.c:1750 [inline]
 __run_timers+0x274/0x384 kernel/time/timer.c:2022
 run_timer_softirq+0x34/0x5c kernel/time/timer.c:2035
 _stext+0x164/0x34c
 run_ksoftirqd+0x40/0x108 kernel/softirq.c:934
 smpboot_thread_fn+0x248/0x3ec kernel/smpboot.c:164
 kthread+0x12c/0x158 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/05 12:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ca72d58361ee be607b78 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: soft lockup in __run_timers
* Struck through repros no longer work on HEAD.