syzbot


BUG: soft lockup in sync_hw_clock

Status: upstream: reported C repro on 2024/04/21 14:58
Subsystems: efi
[Documentation on labels]
Reported-by: syzbot+b3dc5d82ebb394dabe43@syzkaller.appspotmail.com
First crash: 37d, last: 37d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [efi?] BUG: soft lockup in sync_hw_clock 0 (1) 2024/04/21 14:58
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: rcu detected stall in sync_hw_clock origin:upstream C 2 6h15m 142d 0/3 upstream: reported C repro on 2024/01/04 12:38
upstream INFO: rcu detected stall in sync_hw_clock kernel 3 497d 545d 0/26 auto-obsoleted due to no activity on 2023/04/21 23:58
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/05/01 19:05 21m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log

Sample crash report:
watchdog: BUG: soft lockup - CPU#0 stuck for 27s! [kworker/u8:9:2072]
Modules linked in:
irq event stamp: 3823076
hardirqs last  enabled at (3823075): [<ffff80008ae6ec90>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:85 [inline]
hardirqs last  enabled at (3823075): [<ffff80008ae6ec90>] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:95
hardirqs last disabled at (3823076): [<ffff80008ae6c87c>] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline]
hardirqs last disabled at (3823076): [<ffff80008ae6c87c>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551
softirqs last  enabled at (3823050): [<ffff8000800218e4>] softirq_handle_end kernel/softirq.c:400 [inline]
softirqs last  enabled at (3823050): [<ffff8000800218e4>] __do_softirq+0xb10/0xd2c kernel/softirq.c:583
softirqs last disabled at (3823039): [<ffff80008002ad34>] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81
CPU: 0 PID: 2072 Comm: kworker/u8:9 Not tainted 6.9.0-rc3-syzkaller-gb5d2afe8745b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_freezable_pwr_efficient sync_hw_clock (events_freezable_pwr_ef)
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : finish_lock_switch+0xc0/0x1e4 kernel/sched/core.c:5164
lr : raw_spin_rq_unlock_irq kernel/sched/sched.h:1397 [inline]
lr : finish_lock_switch+0xbc/0x1e4 kernel/sched/core.c:5163
sp : ffff80009c8c7290
x29: ffff80009c8c7290 x28: 1fffe000367bc6df x27: ffff80008ee81218
x26: ffff80008ee80664 x25: 1fffe000367bc6f1 x24: ffff80008ee80000
x23: dfff800000000000 x22: ffff0001b3de3788 x21: ffff0001b3de2c98
x20: 0000000000000000 x19: ffff0001b3de2c80 x18: 1fffe000367b9996
x17: ffff80008ee7d000 x16: ffff800080333fec x15: 0000000000000001
x14: 1fffe000367bc590 x13: 0000000000000000 x12: 0000000000000003
x11: 0000000000000001 x10: 0000000000000003 x9 : 0000000000000000
x8 : 00000000003a55e1 x7 : ffff8000802aabc8 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000006 x1 : ffff80008afdfb40 x0 : ffff800124ffb000
Call trace:
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline]
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline]
 raw_spin_rq_unlock_irq kernel/sched/sched.h:1397 [inline]
 finish_lock_switch+0xc0/0x1e4 kernel/sched/core.c:5163
 finish_task_switch+0x120/0x614 kernel/sched/core.c:5281
 context_switch kernel/sched/core.c:5412 [inline]
 __schedule+0x14c0/0x24ec kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6838
 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2558
 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:95
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:148
 __efi_queue_work+0x124/0x1a8 drivers/firmware/efi/runtime-wrappers.c:337
 virt_efi_set_time+0x74/0xb4 drivers/firmware/efi/runtime-wrappers.c:364
 efi_set_time+0x208/0x430 drivers/rtc/rtc-efi.c:184
 rtc_set_time+0x43c/0x888 drivers/rtc/interface.c:158
 update_rtc kernel/time/ntp.c:597 [inline]
 sync_hw_clock+0x2e8/0x480 kernel/time/ntp.c:656
 process_one_work+0x7b8/0x15d4 kernel/workqueue.c:3254
 process_scheduled_works kernel/workqueue.c:3335 [inline]
 worker_thread+0x938/0xef4 kernel/workqueue.c:3416
 kthread+0x288/0x310 kernel/kthread.c:388
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/17 14:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b 18f6e127 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: soft lockup in sync_hw_clock
* Struck through repros no longer work on HEAD.