[master] Refresh action can cause segmentation fault or freeze, and often very slow

[Alexey Balmashnov]

bzr-explorer 0.4

To reproduce:
1. Run explorer
2. Run refresh to be performed

Second attempt causes "Segmentation fault".

[Alexander Belchenko (bialix)]

Alexey Balmashnov пишет:
> Public bug reported:
>
> bzr-explorer 0.4
>
> To reproduce:
> 1. Run explorer
> 2. Run refresh to be performed
>
> Second attempt causes "Segmentation fault".

What is your PyQt version, OS, bzr version?

[Alexey Balmashnov (a.balmashnov)]

Package: python-qt4
Version: 4.4.4-2ubuntu6

Ubuntu 9.04

$ bzr --version
Bazaar (bzr) 1.16.1
  Python interpreter: /usr/bin/python 2.6.2
  Python standard library: /usr/lib/python2.6
  bzrlib: /usr/lib/python2.6/dist-packages/bzrlib

[Ian Clatworthy (ian-clatworthy)]

This is really ugly. I'm seeing the same thing occasionally. I'm yet to go digging but it seems like refreshing the status report multiple times is ok but it segfaults if the repo view (or welcome page?) has been refreshed previously. Or something like that.

[Gary van der Merwe (garyvdm)]

Some tips to solve this:
* Use the modeltest.py from PyQt. Try reproduce the refresh that is happening that is causing the segfault while model test is connected to the model. Qbzr has a class to make modeltest operate better in conjunction with bzr's test suit (see /lib/test/excepthookwatcher.py from qbzr).

* See this change: http://bazaar.launchpad.net/~garyvdm/qbzr/commitstuff/revision/831.1.5 The symptoms were similar.

[Ian Clatworthy (ian-clatworthy)]

Some users are reporting freezes on Windows 7 for this problem.

[Luis Arias (kaaloo)]

I'm regularly experiencing refresh related segmentation faults on 64-bit karmic. I don't see how to provide more information as there is nothing in the logs. Please let me know if there is something I can try.

[Ian Clatworthy (ian-clatworthy)]

Rev 467 of the 1.0 branch has some code which may reduce the frequency of this occurring. Please test.

[Luis Arias (kaaloo)]

Thanks Ian !

I will be testing and post here !

[Ian Clatworthy (ian-clatworthy)]

The frequency of this problem has definitely dropped a lot for me. Just happened again though after reverting a merge.

[dmuir (dmuir)]

Is this something that has improved with newer versions of Ubuntu?

[Alexander Belchenko (bialix)]

dmuir пишет:
> Is this something that has improved with newer versions of Ubuntu?

Yes, it should be better, though not always :-/

[Alexander Belchenko (bialix)]

Partially fixed in trunk, please test and say if it's better now.