mythtv frontend crashes (invalid pointer)..

[Damian O'Sullivan <damian@…>]

Latest SVN..

This has happened a couple of times while I was editing a recording. On exit I would get this (I have included 2 different outputs) -

* glibc detected * mythfrontend: free(): invalid pointer: 0xb350ae3c * ======= Backtrace: ========= /lib/tls/i686/cmov/libc.so.6[0xb5ba3d65] /lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb5ba7800] /usr/lib/libqt-mt.so.3(_ZN7QGArrayD2Ev+0x6f)[0xb6627061] /usr/local/lib/libmythtv-0.20.so.0(_ZN9QMemArrayIcED1Ev+0x26)[0xb77fad26] /usr/lib/libqt-mt.so.3(_ZN11QDataStreamD1Ev+0x4d)[0xb661bcdd] /usr/lib/libqt-mt.so.3(_ZNK11QTranslator11findMessageEPKcS1_S1_+0x520)[0xb631d80c] /usr/lib/libqt-mt.so.3(_ZNK12QApplication9translateEPKcS1_S1_NS_8EncodingE+0xb8)[0xb62cb28c] /usr/lib/libqt-mt.so.3(_ZN6QAccel2trEPKcS1_+0x55)[0xb66b6b6b] /usr/lib/libqt-mt.so.3(_ZN12QKeySequence12decodeStringERK7QString+0x28e)[0xb631072a] /usr/lib/libqt-mt.so.3(_ZN12QKeySequence6assignE7QString+0x264)[0xb6311116] /usr/lib/libqt-mt.so.3(_ZN12QKeySequenceC1ERK7QString+0x84)[0xb63113f2] /usr/local/lib/libmyth-0.20.so.0(_ZN10LircClient7ProcessEv+0xa7)[0xb6d98fa7] ======= Memory map: ========

* glibc detected * /usr/local/bin/mythfrontend: free(): invalid pointer: 0xb3512e3c * ======= Backtrace: ========= /lib/tls/i686/cmov/libc.so.6[0xb5babd65] /lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb5baf800] /usr/lib/libqt-mt.so.3(_ZN7QGArrayD2Ev+0x6f)[0xb662f061] /usr/local/lib/libmythtv-0.20.so.0(_ZN9QMemArrayIcED1Ev+0x26)[0xb7802d26] /usr/lib/libqt-mt.so.3(_ZN11QDataStreamD1Ev+0x4d)[0xb6623cdd] /usr/lib/libqt-mt.so.3(_ZNK11QTranslator11findMessageEPKcS1_S1_+0x520)[0xb632580c] /usr/lib/libqt-mt.so.3(_ZNK12QApplication9translateEPKcS1_S1_NS_8EncodingE+0xb8)[0xb62d328c] /usr/lib/libqt-mt.so.3(_ZN7QObject2trEPKcS1_+0x55)[0xb66c56f1] /usr/local/lib/libmythtv-0.20.so.0(_ZN17NuppelVideoPlayer13calcSliderPosER13StatusPosInfob+0x3fb)[0xb79f0fdb] ======= Memory map: ========

Using mythbuntu 7.10 ..

[danielk]

We need the Valgrind memcheck output or at least a proper gdb backtrace.

[Damian O'Sullivan <damian@…>]

Came home tonight and reproduced it. Then recompiled with debug and guess what?! Yup cannot reproduce after 30mins trying. I am giving up. You can consider this closed. If I can do it again I will update... <sigh>..

[stuartm]

The optimisations used for release builds can cause all sorts of weird segfaults which are then unreproducible with debug builds. (I'm trying to figure out one right now with libmythui)