[arch-general] Help with backtrace from kcmshell crash - changing icons.

[Lukáš Jirkovský]

On 8 August 2010 01:53, David C. Rankin <drankinatty at suddenlinkmail.com> wrote:
> Guys,
>
>        I have a problem with kdemod3. It is really still in quite fantastic
> shape. When I try to switch icons to the 'iceglass' icons theme (or Azenis
> theme, etc..) kcmshell crashes starting with ? "strlen() from
> /lib/libc.so.6" ??
>
>        Hopefully it isn't something like the std c libraries now being
> incompatible with kcmshell?? I'm guessing that there is something in the
> icon file like an extra space or a long filename that is causing Appearance
> -> Icons (change theme). The crash occurs the moment I click on the theme to
> get a preview, so it might be something related to the preview and not the
> icon set itself. I have used this save icon theme with kde3 many times on
> SuSE, so I guess some file has been patched to get around whatever is
> causing this to choke.
>
>        My immediate problem is I suck at reading backtraces. Can you help a
> brother out and give it a once-over and see if a specific file or problem
> stands out? If I can figure out what package started the crash, I can go
> look for an update or patch in AUR or with google generally. But I can't
> tell what package to start looking for. Thanks.
>
> The backtrace is:
>
> 18:38 alchemy:~/dt/icons/coolicons> cat ~/arch/bugs/icons-iceglass.kcrash
> [Thread debugging using libthread_db enabled]
> [KCrash handler]
> #5  0x00007f62ee19c642 in strlen () from /lib/libc.so.6
> #6  0x00007f62ef030cb0 in gz_open () from /usr/lib/libz.so.1
> #7  0x00007f62f1d74e37 in KSVGIconEngine::load(int, int, QString const&) ()
>   from /opt/kde/lib/libkdecore.so.4
> #8  0x00007f62eb1e6616 in IconThemesConfig::themeSelected(QListViewItem*) ()
>   from /opt/kde/lib/kde3/kcm_icons.so
> #9  0x00007f62eb1ead00 in IconThemesConfig::qt_invoke(int, QUObject*) ()
>   from /opt/kde/lib/kde3/kcm_icons.so
> #10 0x00007f62f05753cf in QObject::activate_signal(QConnectionList*,
> QUObject*) () from /opt/qt/lib/libqt-mt.so.3
> #11 0x00007f62f088ec00 in QListView::selectionChanged(QListViewItem*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #12 0x00007f62f064d1d2 in QListView::setCurrentItem(QListViewItem*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #13 0x00007f62f06537ac in QListView::contentsMousePressEventEx(QMouseEvent*)
>    () from /opt/qt/lib/libqt-mt.so.3
> #14 0x00007f62f25e707f in KListView::contentsMousePressEvent(QMouseEvent*)
> ()
>   from /opt/kde/lib/libkdeui.so.4
> #15 0x00007f62f067d61f in QScrollView::viewportMousePressEvent(QMouseEvent*)
>    () from /opt/qt/lib/libqt-mt.so.3
> #16 0x00007f62f067c4d0 in QScrollView::eventFilter(QObject*, QEvent*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #17 0x00007f62f064c91e in QListView::eventFilter(QObject*, QEvent*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #18 0x00007f62f057545c in QObject::activate_filters(QEvent*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #19 0x00007f62f05754b7 in QObject::event(QEvent*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #20 0x00007f62f05a9be3 in QWidget::event(QEvent*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #21 0x00007f62f0517c75 in QApplication::internalNotify(QObject*, QEvent*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #22 0x00007f62f0518feb in QApplication::notify(QObject*, QEvent*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #23 0x00007f62f1d0aee2 in KApplication::notify(QObject*, QEvent*) ()
>   from /opt/kde/lib/libkdecore.so.4
> #24 0x00007f62f04b7858 in QETWidget::translateMouseEvent(_XEvent const*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #25 0x00007f62f04b6356 in QApplication::x11ProcessEvent(_XEvent*) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #26 0x00007f62f04c9022 in QEventLoop::processEvents(unsigned int) ()
>   from /opt/qt/lib/libqt-mt.so.3
> #27 0x00007f62f052e609 in QEventLoop::enterLoop() ()
>   from /opt/qt/lib/libqt-mt.so.3
> #28 0x00007f62f06e5480 in QDialog::exec() () from /opt/qt/lib/libqt-mt.so.3
> #29 0x00007f62ebbe284a in kdemain () from
> /opt/kde/lib/libkdeinit_kcmshell.so
> #30 0x00000000004076e8 in ?? ()
> #31 0x0000000000407e85 in ?? ()
> #32 0x0000000000408562 in ?? ()
> #33 0x0000000000408ea4 in ?? ()
> #34 0x00007f62ee13fc4d in __libc_start_main () from /lib/libc.so.6
> #35 0x0000000000404549 in ?? ()
> #36 0x00007fff18e7cb18 in ?? ()
> #37 0x000000000000001c in ?? ()
> #38 0x0000000000000005 in ?? ()
> #39 0x00007fff18e7da23 in ?? ()
> #40 0x0000000000000000 in ?? ()
>
>
> --
> David C. Rankin, J.D.,P.E.
> Rankin Law Firm, PLLC
> 510 Ochiltree Street
> Nacogdoches, Texas 75961
> Telephone: (936) 715-9333
> Facsimile: (936) 715-9339
> www.rankinlawfirm.com
>

Hi David,
assuming the problem isn't in Qt or in libc the crash is triggered in
/opt/kde/lib/kde3/kcm_icons.so. To better understand what's going on
there you would have to read the source to get some understanding of
it. I guess that the gz_open() function gets NULL or some invalid
pointer instead of proper path.

Lukas