[Darshan-users] Segmentation fault with Darshan-3.1.1

[Suman, Preeti]

Hello Shane,

Thank you for the update. This is great news. 

Regards,
Preeti

-----Original Message-----
From: darshan-users-bounces at lists.mcs.anl.gov [mailto:darshan-users-bounces at lists.mcs.anl.gov] On Behalf Of Shane Snyder
Sent: Tuesday, November 1, 2016 3:24 PM
To: Phil Carns <carns at mcs.anl.gov>; darshan-users at lists.mcs.anl.gov
Subject: Re: [Darshan-users] Segmentation fault with Darshan-3.1.1

We've actually gotten reports of this from a few users, and it is due to a bug in the Darshan library. We have a fix for this issue in our master branch now, and will include it in the upcoming 3.1.2 release which we will try to get released ASAP.

The bug should affect any binary that calls 'fopen64', which apparently 'ls' is doing. If possible, it might be best to use one of Darshan's static linking methods for instrumentation in the mean time, instead of LD_PRELOADing the shared library.

Thanks,
--Shane

On 10/26/2016 08:52 AM, Phil Carns wrote:
> Hi Preeti,
>
> Kevin is right; it is preferable to just set LD_PRELOAD for the 
> application that you want to instrument.
>
> That said, LD_PRELOAD of Darshan on normal command line programs isn't 
> supposed to cause a segmentation fault.  In principle it should just 
> silently do nothing if MPI isn't initialized in the executable in 
> question.  There can be a number of complicating factors, though.  If 
> you can't avoid the problem then let us know (maybe with a stack trace 
> from the core file) and we can try to debug it further.
>
> thanks,
> -Phil
>
> On 10/24/2016 05:08 PM, Harms, Kevin wrote:
>>    If you set LD_PRELOAD in your shell, then you will be intercepting 
>> any POSIX operations by any program, such as ls. I’m guessing you 
>> don’t want to profile ‘ls’? You can set LD_PRELOAD only for the 
>> application you want to profile.
>>
>>    $ LD_PRELOAD=/path/to/darshan/lib/libdarshan.so ./myapp
>>
>>    Add the FORTRAN library as well if you are profiling FORTRAN code. 
>> You can also export LD_PRELOAD it with the proper mpirun options.
>>
>> kevin
>>
>> -----Original Message-----
>> From: <darshan-users-bounces at lists.mcs.anl.gov> on behalf of "Suman, 
>> Preeti" <preeti.suman at intel.com>
>> Date: Monday, October 24, 2016 at 4:01 PM
>> To: "darshan-users at lists.mcs.anl.gov" 
>> <darshan-users at lists.mcs.anl.gov>
>> Subject: [Darshan-users] Segmentation fault with Darshan-3.1.1
>>
>>      Hello,
>>            With Darshan-3.1.1, compiled with GCC-5.1 or Intel-17 
>> compilers on KNL, when 
>> LD_PRELOAD=<path_to>/darshan-runtime/lib/libdarshan.so is set, I am 
>> getting a segmentation fault whenever I do ‘ls’.
>>      Example:
>>      bash-4.2$ ls
>>      Segmentation fault (core dumped)
>>            Have you encountered this before?
>>      For version-3.1.1 is it recommended to build Darshan with
>>      --disable-ld-preload
>>      ?
>>            Thanks,
>>      Preeti Suman
>>      Software Development Engineer,
>>      Systems Engineering, Architecture & Runtimes
>>      Email:
>>      preeti.suman at intel.com <mailto:preeti.suman at intel.com>
>>
>> _______________________________________________
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>> Darshan-users at lists.mcs.anl.gov
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>
>
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