On June 9, 2020 7:37:31 PM GMT+03:00, Ramon Fried [off-list ref] wrote:

On June 9, 2020 7:34:46 PM GMT+03:00, Sebastian Andrzej Siewior
[off-list ref] wrote:

quoted

On 2020-06-09 11:17:53 [-0500], Tom Zanussi wrote:

quoted

Hi Sebastian,

Hi Tom,

quoted

I did find a problem with the patch when configured as !SMP since in
that case the RUN flag is never set (will send a patch for that
shortly), but that wouldn't be the case here.

How?

| #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
| static inline int tasklet_trylock(struct tasklet_struct *t)
| {
|         return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
| }

I can't tell from the backtrace if he runs with RT or without but I
assumed RT. But yes, for !SMP && !RT it would explain it.

PREEMT_FULL is enabled. 
I'm working on getting symbols for this trace, this is a crash kernel
so everything is stripped naked. 
Thanks, Ramon

Correction. normal kernel is running with RT enabled, crash kernel without. 

quoted

quoted

It would help to be able to reproduce it, but I haven't been able to
yet.

Tom

Sebastian

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