NPTL Thread lockup issue on ARMv7

Carmelo AMOROSO carmelo.amoroso at st.com
Tue Feb 1 16:17:51 UTC 2011


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On 2/1/2011 5:14 PM, Nitin Garg wrote:
> Hope I created the patch correctly. Pls let me know if this is
> incorrect, otherwise pls add it to repository.
> 
> Thanks,
> Nitin
> 

Nitin,
according to the comment by Thomas, I've understood that we already have
a good implementation in the nptl path, it should be just the case to
fix the buildsys to properly pick-up the right one.

I will check... Khem ?

Carmelo

> On Tue, Feb 1, 2011 at 1:13 AM, Khem Raj <raj.khem at gmail.com> wrote:
>  > On (01/02/11 00:32), Nitin Garg wrote:
>  >> Recently we came accross an issue on ARMv7 processors while running
>  >> multiple threads. If say 3 threads are running continuously, 1 or 2
>  >> might get locked somewhere. If we attach gdb and run again, all 3
>  >> threads start executing for a while and after some time 1 or 2 threads
>  >> gets locked-up again. The backtrace showed the threads are stuck in
>  >> __pthread_mutex_lock (atomic_compare_and_exchange_val_acq).
>  >>
>  >> We noticed that the atomic compare and exchange functions are not
>  >> atomic for ARM. Once we added the Atomic compare and exchange
>  >> function, the problem was resolved.
>  >>
>  >> Pls see below patch for review and kindly add it to next release.
>  >
>  > This looks ok to me but you have to send a properly formatted and
>  > signed-off patch so it can be tested and included. Using git format-patch
>  > and git send-email is your best bet
>  >
>  > -Khem
>  >
> 

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