Re: [vizstack-users] Vizstack and SLURM issue

[Kumar, S. <shr...@hp...>]

Hi Peter,

That's the first time I have seen a SLURM segfault with VizStack. As part of the cleanup sequence, we issue a single scancel command that cancels the job.

Looks like it is the first time you are seeing this error. Is it reproducible using the same steps that you have mentioned ??

Can you also check the following ?
  - Start the SSM
  - Start the viz-tvnc script
  - Let the session startup (You may connect to the session to verify)
  - Lookup the SLURM queue using "sinfo"
  - Cancel the SLURM job using "scancel"
  - Do you see a similar segfault ? I am trying to simulate the things the vsapi does here.

Also, can you send me the SSM log when it terminates ? ( /var/log/vs-ssm.log ) I don't like SSM crashes, since it's a single point of failure !

Regards
-- Shree

-----Original Message-----
From: Pet...@cs... [mailto:Pet...@cs...] 
Sent: Monday, July 05, 2010 2:09 PM
To: viz...@li...
Subject: [vizstack-users] Vizstack and SLURM issue

Hello,

I'm seeing an issue with Vizstack 1.1-2 and Slurm running under Ubuntu 10.04. I currently have two nodes running with the distro provided SLURM (2.1.0) configured as per the Vizstack manual. I can start viz-tvnc fine and an X server will be started on a node/GPU as expected but when terminating the session, the job remains in the SLURM queue and a message such as the following in the syslog:

scancel[5701]: segfault at 0 ip 00007f6c22edc376 sp 00007fff1341ca08 error 4 in libc-2.11.1.so[7f6c22db6000+178000]

I can manually clear the jobs with the scancel command.

The SSM seems prone to terminating when there are such jobs left the the queue.

Any ideas?


Regards,
Peter

Peter Tyson
CSIRO IM&T - Advanced Scientific Computing
Gate 5 Normanby Road
Clayton Vic 3168
Ph +61 3 9545 2021
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