Ubuntu
qt4-x11 package

  1. Bug #705689
  2. Comment #17

Comment 17 for bug 705689

Revision history for this message
Jani Monoses (jani) wrote : Re: unity-2d-launcher crashes with segfault error on armel (natty only)

The unity-2d-launcher crash can be reproduced with a locally built Qt, however the app I pasted in comment #9 works.
I built Qt with regular system libs and not in a chroot so maybe there's a slight difference.

As seen for the sample app, if I built Qt with either g++ or gcc 4.4(there are both C++ and C files in the source) the crash is similar, so I don't think this is a compiler regression.

The bug occurs when accessing a volatile int member of a struct via an int() operator defined on that class and which simply returns the value.

QBasicAtomicInt class in this file
http://qt.gitorious.org/qt/qt/blobs/4.7/src/corelib/thread/qbasicatomic.h

The two crashes I have seen both access that field from within the macro Q_DECLARE_METATYPE at line 265 in
http://qt.gitorious.org/qt/qt/blobs/4.7/src/corelib/kernel/qmetatype.h

That macro is used to define GestureState metatype, the one seen in the stacktraces above.

I'll try to check whether https://bugs.launchpad.net/gcc-linaro/+bug/675347 is related.