Re: [Xenomai-core] [bug] zombie mutex owners

[Jan Kiszka <jan.kiszka@domain.hid>]

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Philippe Gerum wrote:
> Jan Kiszka wrote:
>> Dmitry Adamushko wrote:
>>
>> Indeed, this solves the issue more gracefully.
>>
>> Looking at this again from a different perspective and running the test
>> case with your patch in a slightly different way, I think I
>> misinterpreted the crash. If I modify task2 like this
>>
>> void task2_fnc(void *arg)
>> {
>>         printf("started task2\n");
>>         if (rt_mutex_lock(&mtx, 0) < 0) {
>>                 printf("lock failed in task2\n");
>>                 return;
>>         }
>> //        rt_mutex_unlock(&mtx);
>>
>>         printf("done task2\n");
>> }
>>
>> I'm also getting a crash. So the problem seems to be releasing a mutex
>> ownership on task termination. Well, this needs further examination.
>>
> 
> The native skin does not implement robust mutex, indeed.

Yeah, lunch opened my eyes: the skin data structure (RT_MUTEX) is not
updated appropriately on task cleanup. What about some callback hook in
xnsynch_t to invoke a per-skin cleanup handler when running
xnsynch_release_all_ownerships?

Jan


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