[gmx-developers] glibc qsort bug crashing mdrun

[Berk Hess]

At least from up till seven years ago till now.
As I said, the crash is very unlikely.
Two threads have to call qsort at nearly exactly the same time.

Berk

Alexey Shvetsov wrote:
> Hi,
>
> What versions of glibc has this bug?
> I didnt see any crashed with threaded mdrun version with glibc-2.11.x
> on x86_64 (both with gcc-4.4 and gcc-4.5)
>
> 2010/6/21 Berk Hess <hess at cbr.su.se>:
>   
>> Hi,
>>
>> I just discovered that there is a bug in qsort in glibc that makes it
>> non thread safe.
>> So mdrun with the GMX thread library could crash randomly. This occured
>> very seldomly.
>> We have one system that we managed to crash with certain compiler
>> settings in 1% of the runs.
>> This could explain some crashes people have experienced (gcc 4.1 is
>> another danger).
>> I have now replaced qsort by our own qsort in case we use threads.
>>
>> Berk
>>
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