Re: Bug#479952: libc6/s390 - __pthread_mutex_lock: Assertion `mutex->__data.__owner == 0' failed.
Carlos O'Donell wrote:
> On Sat, Oct 25, 2008 at 1:21 PM, Julien Danjou <acid@debian.org> wrote:
>> Is there anything from an outsider that could help?
>
> I've seen this on-and-off again on the hppa-linux port. The issue has,
> in my experience, been a compiler problem. My standard operating
> procedure is to methodically add volatile to the atomic.h operations
> until it goes away, and then work out the compiler mis-optimization.
>
> The bug is almost always a situation where the lll_unlock is scheduled
> before owner = 0, and the assert catches the race condition where you
> unlock but have not yet cleared the owner.
Are you sure this is a compiler problem? Unless you use explicit atomic
memory accesses or volatile the compiler is supposed to re-order memory
access. Perhaps I'm misunderstanding you.
Andrew.
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