[PyQt] Python update_refs assertion with updated sip and PyQt

Phil Thompson phil at riverbankcomputing.co.uk
Tue Aug 14 22:43:00 BST 2007

On Tuesday 14 August 2007 9:16 pm, Claus, Richard wrote:
> Hi All,
> One of our Qt 4 applications that has been running fine for quite some time
> suddenly started intermittantly producing the following crash after we
> upgraded sip and PyQt:
> python: Modules/gcmodule.c:261: update_refs: Assertion `gc->gc.gc_refs !=
> 0' failed. Abort
> Versions under which it worked correctly are sip 4.5.2, PyQt 4.1.1, Qt
> 4.2.3 and python 2.5.0.  The crashes have been occuring with versions sip
> 4.7, PyQt 4.3, Qt 4.3.0 and python 2.5.1.  We also saw this happen with sip
> 4.6, but don't remember the PyQt version number.  We're quite confident
> that we've seen the crash with both python versions.  The OS is Linux RHEL
> WS 4 (Nahant Update 5) 2.6.9-55.0.2.Elsmp.
> I'm not sure whether this is real or not, but I think I can trigger the
> crash by moving the GUI window around on the screen before it has completed
> drawing for the first time.
> Could someone please give us a pointer to where/how we should start
> looking?

First update to current SIP and PyQt snapshots. You then need to simplify you 
application to produce a test case that reproduces the problem.


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