Hi Oswald,

thanks for your reply . I am trying to track down what is this process 
could be .
is there any way you recommend I approach the problem ?

when breaking in those "hangs" I consistently fall in a select call :
see below the stack trace from qt-creator .

0    select    /lib64/libc.so.6    0    0x00000038abccc4c2   
1    QProcessManager::run    qprocess_unix.cpp    245    
0x00002b6eb12f93c4   
2    QThreadPrivate::start    qthread_unix.cpp    244    
0x00002b6eb121f035   
3    start_thread    /lib64/libpthread.so.0    0    0x00000038ac806367   
4    clone    /lib64/libc.so.6    0    0x00000038abcd2f7d   

I am not sure how to tell what process is running that is hanging the 
system ?

any hint ?

Thanks a lot

Damien





> On Fri, Dec 11, 2009 at 05:26:33PM +0100, ext Damien Fagnou wrote:
>   
>> building a local version of QtCreator
>>
>> and breaking when the IDE hang , the debugger say I am  in :
>>
>> ---->>>        int nselect = select(qt_qprocess_deadChild_pipe[0] + 1, 
>>
>>     
> this is useless without a complete backtrace. but i can already tell
> that it is something along the lines of QProcess::execute(), i.e.,
> synchronous command execution. probably something we didn't think would
> ever take more than a few millisecs ...
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