RE: Problem with autosave module making it crash at random basis.

["Abdalla Ahmad" <abdalla.ahmad@sesame.org.jo>]

Hi Michael

Since the OS is Scientific Linux 6.4 and will be upgraded to CentOS, I went for the newest version of the autosave module for now because I could not find the RPM in the local repo.

The build process did not report any warning, so the newest version is.

Best Regards,
Abdalla.

-----Original Message-----
From: Michael Davidsaver [mailto:mdavidsaver@gmail.com] 
Sent: Monday, April 09, 2018 7:16 PM
To: Abdalla Ahmad <abdalla.ahmad@sesame.org.jo>; tech-talk@aps.anl.gov
Subject: Re: Problem with autosave module making it crash at random basis.

A couple of points

* save_restore.c includes epicsStdio.h so it is using IOC shell redirection.
So the FILE* being used is not directly stdout/stderr.

* Installing debug symbol RPM for libc.so might give some more information about whether the error involves the FILE*, the string buffer, or one of the arguments to be formatted.

* Look for printf() format related warnings from GCC when building autosave.
It's not unheard of for incorrect format specs in (rarely run) error path prints to turn a recoverable error into a crash.


On 04/07/2018 11:06 PM, Abdalla  Ahmad wrote:
> Hi
> 
>  
> 
> One of our IOCs crashed and it appears to do so from time to time. I used valgrind on the IOC process and the attached file contains valgrind output right when the IOC crashed. The first 2 lines are the IOC shell output before the segmentation fault happened. I could not figure out whether the problem from the module sending something corrupted to the printf functions or the standard C library itself is somehow corrupted. I tried cloning the latest autosave version from github but the build failed. Build output is in the attached too.
> 
>  
> 
> OS: Scientific Linux 6.4 32-bit.
> 
> EPICS: 3.14.12.3
> 
> SynApps 5.6
> 
> Autosave 4.8
> 
>  
> 
> Best Regards,
> 
>  
> 
> Abdalla Ahmad
> 
> Control Engineer
> 
> SESAME
> 
> Allan, Jordan.
> 
> Tel: (+962-5) 3511348 , ext. 265
> 
> Fax: (+962-5) 3511423
> 
> Mob: (+962-7)88183296
> 
> www.sesame.org.jo <http://www.sesame.org.jo/>
> 
>  
>