NPTL Thread lockup issue on ARMv7

Nitin Garg nitingarg98 at gmail.com
Tue Feb 1 16:28:44 UTC 2011


Sure, let me test it.

On Tue, Feb 1, 2011 at 10:25 AM, Carmelo AMOROSO <carmelo.amoroso at st.com> wrote:
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> On 2/1/2011 5:21 PM, Khem Raj wrote:
>> On Tue, Feb 1, 2011 at 8:17 AM, Carmelo AMOROSO <carmelo.amoroso at st.com> wrote:
>> 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 ?
>>
>>> yes thats fine too it will fix nptl I thought moving it to common arm
>>> would make it LT use it too but probably fixing just for nptl it
>>> better
>>
>
> so a git mv libpthread/nptl/...../bits/atomic.h to libc/sysdeps/....
> would be enough.
>
> Niting, would you like to try on your env before ?
>
> Thanks,
> Carmelo
>
>> 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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