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List:       pykde
Subject:    Re: [PyQt] Regression with guiqwt somewhere after PyQt4 4.10
From:       Dmitry Shachnev <mitya57 () ubuntu ! com>
Date:       2013-12-08 12:24:25
Message-ID: CAKimPHUWs+YrmJMTsmJp=Rx-EFFuqjaRmbNUHgtfMbeD=sOvRw () mail ! gmail ! com
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On Sun, Dec 8, 2013 at 4:14 PM, Phil Thompson
<phil@riverbankcomputing.com> wrote:
> On 2013-12-08 11:44, Dmitry Shachnev wrote:
> > 
> > On Wed, Nov 13, 2013 at 3:54 PM, Dmitry Shachnev <mitya57@ubuntu.com>
> > wrote:
> > > 
> > > The crash happens here (src/corelib/kernel/qmetaobject.cpp:525):
> > > 
> > > for (const QMetaObject *m = *baseObject; m; m = m->d.superdata) {
> > > int i = (MethodType == MethodSignal && priv(m->d.data)->revision
> > > > = 4)
> > > ? (priv(m->d.data)->signalCount - 1) :
> > > (priv(m->d.data)->methodCount - 1);
> > > 
> > > The problem is that m->d.data is null on the fourth iteration:
> > > 
> > > (gdb) p **baseObject
> > > $12 = {d = {superdata = 0x8527d80, stringdata = 0x8712588
> > > "LevelsHistogram", data = 0x8fddb48, extradata = 0x0}}
> > > (gdb) p *(baseObject->d.superdata)
> > > $13 = {d = {superdata = 0x8ec6f00, stringdata = 0x88123b0 "CurvePlot",
> > > data = 0x8e156f8, extradata = 0x0}}
> > > (gdb) p *(baseObject->d.superdata->d.superdata)
> > > $14 = {d = {superdata = 0xb13244e0, stringdata = 0x8ecd1a0 "BasePlot",
> > > data = 0x8ef04e0, extradata = 0x0}}
> > > (gdb) p *(baseObject->d.superdata->d.superdata->d.superdata)
> > > $15 = {d = {superdata = 0xb12bc4ec, stringdata = 0x0, data = 0x0,
> > > extradata = 0xb12bc4cd}}
> > > 
> > > A backtrace is attached.
> > > 
> > > On Sat, Nov 9, 2013 at 9:47 PM, Scott Kitterman <debian@kitterman.com>
> > > wrote:
> > > > 
> > > > Below is a part of an Ubuntu bug report.  You can find a reproduction
> > > > test case
> > > > at
> > > > https://bugs.launchpad.net/ubuntu/+source/python-qt4/+bug/1249571/+attachment/3903922/+files/test_guiqwt.py
> > > > 
> > 
> > 
> > Hi Phil,
> > 
> > I continue getting pings about that. Do you have any thoughts on the
> > issue? Sounds like a problem in PyQt.
> 
> Then I need a PyQt test case that demonstrates the problem. I have no idea
> what guiqwt is.

I also never used that, but guiqwt is http://code.google.com/p/guiqwt/.

Yes, it is a rare case of a bug that you need some efforts to reproduce :(

--
Dmitry Shachnev
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