Re: [Boost-users] boost MPI Signal: Segmentation fault (11)

Subject: Re: [Boost-users] boost MPI Signal: Segmentation fault (11)
From: Matthias Troyer (troyer_at_[hidden])
Date: 2010-07-26 17:46:25

Hi Jack,

This can be anywhere in your code. Why don't you compile it with debug symbols and run it through a debugger to see where the segmentation fault occurred. This is most likely an invalid pointer being used by your code.

Matthias

On 25 Jul 2010, at 22:57, Jack Bryan wrote:

> Dear All,
> 
> I run a 6 parallel processes with boost MPI on a system with OpenMPI. 
> 
> When the run-time of the program is short, it works well.
> 
> But, if the run-time is long, I got errors: 
> 
> [n124:45521] *** Process received signal ***
> [n124:45521] Signal: Segmentation fault (11)
> [n124:45521] Signal code: Address not mapped (1)
> [n124:45521] Failing at address: 0x44
> [n124:45521] [ 0] /lib64/libpthread.so.0 [0x3c50e0e4c0]
> [n124:45521] [ 1] /lib64/libc.so.6(strlen+0x10) [0x3c50278d60]
> [n124:45521] [ 2] /lib64/libc.so.6(_IO_vfprintf+0x4479) [0x3c50246b19]
> [n124:45521] [ 3] /lib64/libc.so.6(_IO_printf+0x9a) [0x3c5024d3aa]
> [n124:45521] [ 4] /home/path/exec [0x40ec9a]
> [n124:45521] [ 5] /lib64/libc.so.6(__libc_start_main+0xf4) [0x3c5021d974]
> [n124:45521] [ 6] /home/path/exec [0x401139]
> [n124:45521] *** End of error message ***
> 
> It seems that there may be some problems about memory management. 
> 
> But, I cannot find the reason. 
> 
> My program needs to write results to some files. 
> 
> If I open the files too many without closing them, I may get the above errors. 
> 
> But, I have removed the writing files from my program. 
> 
> The problem appears again when the program runs longer time. 
> 
> Any help is appreciated. 
> 
> Jack
> 
> July 25  2010
> 
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