WISH Redhat crashes

[Martyn Gigg]

Laurent has reported crashes on his Redhat machine in the WISH cabin that happen a lot but not reproducibly.

Again I don't know when exactly it happened, but I had that bug
probably 7 or 8 times working with the users yesterday night.
It seems to be correlated to:
1- Doing some data processing and generating a number of workspaces
2- Delete them and graphics associated with them
3- reprocess with the same output names
Alternatively, sometimes it happens just by replacing workspaces. 

[Martyn Gigg]

(In [4378]) A fix for CylinderAbsorption that could still try to run if the sample volume was zero, which meant it crashed. Also a couple of improvements to the MantidDock regarding workspace groups could possibly have caused a crash. Re #1224

[Martyn Gigg]

(In [4379]) Add debug symbols to release build as they can be useful and now we know they don't break OpenMP useage. Re #1224

[Martyn Gigg]

(In [4440]) Fix an issue with symbol visibility on machines using ld (linux/mac). Dlopen was not able to find some symbols defined but not referenced in the core Mantid libraries due to the default behaviour for dynamic executables being to only export the symbols referenced at link time. This was causing issues with Group/UnGroup notifications. Re #1224

[Nick Draper]

Bulk move of tickets to iteration 27, if your ticket is essential for Iteration 26 then move it back.

[Martyn Gigg]

No reports for quite some time regarding odd crashes so I'll close this.

[Brett Tully]

Testing script

[Brett Tully]

Testing script

[Brett Tully]

I modified the reduction test script to loop through the reduction multiple times. While an unusual use of Mantid, it gives a reproducible crash on 1.1.9157 RHEL 5. The two scripts (attached) differ by the number of outer and inner loops conducted.

Run example_reduction_BTloop.py successively:

• Attempt 1: Segmentation Fault on the second run of the script
• Attempt 2: Segmentation Fault on the second run of the script
• Attempt 3: Very slow execution on the second run of the script, normal on the third and Segmentation Fault on the fourth run.

Run example_reduction_BTloop-2.py successively:

• Attempt 1: Segmentation on the fifth run of the script.

[Martyn Gigg]

The example scripts are not a usual way of running the SANS reduction so I'm moving this to iteration 28.

[Martyn Gigg]

(In [9798]) Avoid some possible crashes on RHEL5 when tight looping with plots. Re #1224

[Michael Whitty]

tested on mantidlx1 v 11062. ran scripts several times without crash.

[Stuart Campbell]

This ticket has been transferred to github issue ​2071