System freezes with Kernel BUG at kernel/time/timer.c:1108 run_timer_softirq()

System freezes with Kernel BUG at kernel/time/timer.c:1108 run_timer_softirq()

[Raghavendra. S]

Hi,

  In my x86 laptop I could observe random panic with Fatal exception
in interrupt. We are testing Wi-Fi with our own driver issue occur
randomly after 2-3 hours of testing.

  Panic is due to fatal except in interrupt and Kernel stack trace is
run_timer_softirq()->__run_timers()->cascade()->BUG_ON(tbase_get_base(timer->base)
!= base);

[image: Inline image 1]



  Any pointers to debug this will be of great help.


-Raghu
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System freezes with Kernel BUG at kernel/time/timer.c:1108 run_timer_softirq()

[Mulyadi Santosa]

On Wed, Oct 14, 2015 at 11:02 AM, Raghavendra. S
<raghavendra.akkasali@gmail.com> wrote:
>
> Hi,
>
>   In my x86 laptop I could observe random panic with Fatal exception in interrupt. We are testing Wi-Fi with our own driver issue occur randomly after 2-3 hours of testing.
>
>   Panic is due to fatal except in interrupt and Kernel stack trace is  run_timer_softirq()->__run_timers()->cascade()->BUG_ON(tbase_get_base(timer->base) != base);
>
>
>
>
>
>   Any pointers to debug this will be of great help.
>
>
> -Raghu
>
First of all, please send email using plain text mode. If you need to
send picture, better attach it to somewhere else and provide us with
the link.

I am just guessing:
it might be that when timer is about to run or in the middle of
running, the data structure that represents the timer gets deleted.

Sounds like race condition then.

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com