[Uim-bugs] [Bug 19877] New: Segfaults in libqt-mt.3.3. 8 when Qt3 and Qt4 support both enabled

http://bugs.freedesktop.org/show_bug.cgi?id=19877

           Summary: Segfaults in libqt-mt.3.3.8 when Qt3 and Qt4 support
                    both enabled
           Product: UIM
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: bridge: Qt
        AssignedTo: uim-bugs@...
        ReportedBy: epp.8@...


Building UIM with support for both Qt3 and Qt4 causes persistent segmentation
faults at runtime across Qt4-based applications when Qt4 is built with
qt3support enabled (I haven't tested with qt3 support disabled as it's
currently a dependency of KDE4).

The messages in my syslog all take similar form to:
"Feb  1 09:12:53 Yue [211765.301509] kded4[23399]: segfault at 100000340 ip
00007f280e1f2928 sp 00007fff1f8d6590 error 4 in
libqt-mt.so.3.3.8[7f280dc47000+79c000]"

Reinstalling UIM with either qt3 or qt4 disabled immediately allows running of
these apps again.


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--- Comment #1 from Etsushi Kato <ek.kato@...>  2009-02-01 18:44:03 PST ---
Could you tell me which version of uim is used? Also Qt version please.

I don't see such problem with Fedora 10's qt-4.4.3.  I think qt3support is
enable by default in Fedora 10.


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--- Comment #2 from Wyatt Epp <epp.8@...>  2009-02-02 04:24:53 PST ---
Qt version is 4.4.2 (4.4.3 should be functionally the same-- it was a release
for branding change only, as I recall)
UIM 1.5.4 and 1.5.5


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--- Comment #3 from Etsushi Kato <ek.kato@...>  2009-02-02 18:18:17 PST ---
I still don't quite understand why libqt-mt.so.3.3.8 is loaded with your Qt4
application.  AFAIK, this library is only loaded with the application compiled
with Qt3.  And even Qt3 support is enabled with Qt4, this library is totally
unrelated.  Seems weird.


For what it's worth, here is the output of ldd /usr/bin/kded4 | grep -i qt in
Fedora 10.

$ ldd /usr/bin/kded4 | grep -i qt
        libQtSvg.so.4 => /usr/lib/libQtSvg.so.4 (0x0399d000)
        libQtNetwork.so.4 => /usr/lib/libQtNetwork.so.4 (0x005bb000)
        libQtCore.so.4 => /usr/lib/libQtCore.so.4 (0x02bfa000)
        libQtDBus.so.4 => /usr/lib/libQtDBus.so.4 (0x0370f000)
        libQtXml.so.4 => /usr/lib/libQtXml.so.4 (0x00510000)
        libQtGui.so.4 => /usr/lib/libQtGui.so.4 (0x02e21000)


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--- Comment #4 from Wyatt Epp <epp.8@...>  2009-02-02 19:32:39 PST ---
Just asked the qt folks about this and it seems libqt-mt.so.3 is read at the
initialization phase when Qt checks all of its plugins.  Running an app (tried
kwrite this time) with QT_DEBUG_PLUGINS=1 and uim 1.5.5 built as specified
shows that it gets to the Qt4 libuiminputcontextplugin.so and crashes
immediately thereafter.


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--- Comment #5 from Etsushi Kato <ek.kato@...>  2009-02-02 20:01:03 PST ---
(In reply to comment #4)
> Just asked the qt folks about this and it seems libqt-mt.so.3 is read at the
> initialization phase when Qt checks all of its plugins.  Running an app (tried
> kwrite this time) with QT_DEBUG_PLUGINS=1 and uim 1.5.5 built as specified
> shows that it gets to the Qt4 libuiminputcontextplugin.so and crashes
> immediately thereafter.

You mean kwrite tries to load libuiminputcontextplugin.so (for Qt4) and
libquiminputcontextplugin.so (for Qt3) at the same time?

In my case, even if I force to set the qt3 plugin directory into QT_PLUGIN_PATH
(i.e. invoke QT_DEBUG_PLUGINS=1 QT_PLUGIN_PATH=/usr/lib/qt-3.3/plugins kwrite),
kwrite don't load libquiminputcontextplugin.so (for Qt3) with showing following
message, and works fine with Qt4 uim's plugin.

QFactoryLoader::QFactoryLoader() looking at
"/usr/lib/qt-3.3/plugins/inputmethods/libquiminputcontextplugin.so"
"The file '/usr/lib/qt-3.3/plugins/inputmethods/libquiminputcontextplugin.so'
is not a valid Qt plugin."
         not a plugin


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Muneyuki Noguchi <nogu.dev@...> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nogu.dev@...
           Platform|x86-64 (AMD64)              |All




--- Comment #6 from Muneyuki Noguchi <nogu.dev@...>  2009-09-09 04:40:47 PST ---
I can reproduce this bug on my PowerPC box.

As I commented in the Gentoo bugzilla,
https://bugs.gentoo.org/show_bug.cgi?id=257266

the output of gdb is here:
https://bugs.gentoo.org/attachment.cgi?id=203573

Qt: 4.5.1 and 3.3.8
uim: 1.5.6

./configure --prefix=/usr --build=powerpc-unknown-linux-gnu
--host=powerpc-unknown-linux-gnu --mandir=/usr/share/man
--infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
--localstatedir=/var/lib --with-x --without-canna --without-eb --disable-emacs
--without-lispdir --disable-gnome-applet --with-gtk2 --with-libedit
--enable-kde-applet --with-m17nlib --enable-fep --enable-nls --without-prime
--with-qt --with-qt-immodule --with-qt4-immodule --without-xft --enable-dict
--enable-pref --with-anthy-utf8 --enable-notify=knotify3


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--- Comment #7 from Etsushi Kato <ek.kato@...>  2009-09-09 21:33:58 PST ---
(In reply to comment #6)

> I can reproduce this bug on my PowerPC box.
>
> As I commented in the Gentoo bugzilla,
> https://bugs.gentoo.org/show_bug.cgi?id=257266
>
> the output of gdb is here:
> https://bugs.gentoo.org/attachment.cgi?id=203573
>
> Qt: 4.5.1 and 3.3.8
> uim: 1.5.6

Could you please tell me how libqt-mt.so.3 is loaded with Qt4 application on
Gentoo?  It is totally strange.

Perhaps compilation of libuiminputcontextplugin.so on Gentoo is broken?


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--- Comment #8 from Muneyuki Noguchi <nogu.dev@...>  2009-09-12 00:45:10 PST ---
In the case of Gentoo,
/usr/lib/qt4/plugins/inputmethods/libuiminputcontextplugin.so and
/usr/qt/3/plugins/inputmethods/libquiminputcontextplugin.so are installed when
both Qt3 and Qt4 support are enabled.

Qt4 applications load libuiminputcontextplugin.so (Qt4) even when
QT_PLUGIN_PATH is set.

$ QT_DEBUG_PLUGINS=1 qtconfig
QFactoryLoader::QFactoryLoader() looking at
"/usr/lib/qt4/plugins/inputmethods/libqimsw-multi.so"
keys ("imsw-multi")
QFactoryLoader::QFactoryLoader() looking at
"/usr/lib/qt4/plugins/inputmethods/libuiminputcontextplugin.so"
Segmentation fault

$ QT_DEBUG_PLUGINS=1 QT_PLUGIN_PATH=/usr/qt/3/plugins qtconfig
QFactoryLoader::QFactoryLoader() looking at
"/usr/lib/qt4/plugins/inputmethods/libqimsw-multi.so"
keys ("imsw-multi")
QFactoryLoader::QFactoryLoader() looking at
"/usr/lib/qt4/plugins/inputmethods/libuiminputcontextplugin.so"
Segmentation fault

$ QT_DEBUG_PLUGINS=1 QT_PLUGIN_PATH=/usr/lib/qt4/plugins qtconfig
QFactoryLoader::QFactoryLoader() looking at
"/usr/lib/qt4/plugins/inputmethods/libqimsw-multi.so"
keys ("imsw-multi")
QFactoryLoader::QFactoryLoader() looking at
"/usr/lib/qt4/plugins/inputmethods/libuiminputcontextplugin.so"
Segmentation fault


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--- Comment #9 from Muneyuki Noguchi <nogu.dev@...>  2009-09-12 01:03:14 PST ---
Created an attachment (id=29429)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29429)
full backtrace of gdb

qtconfig loads /usr/lib/qt4/plugins/inputmethods/libuiminputcontextplugin.so
(#70-72) when started.


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--- Comment #10 from Muneyuki Noguchi <nogu.dev@...>  2009-09-12 02:51:01 PST ---
Created an attachment (id=29435)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29435)
patch to prevent stripping libuiminputcontextplugin.so, which do NOT seem to
relate to this bug

FYI, libuiminputcontextplugin.so (Qt4) is stripped in "make install" phase,
while libquiminputcontextplugin.so (Qt3) isn't. This patch prevents
libuiminputcontextplugin.so (Qt4) from being stripped. Even if this patch is
applied, Qt4 applications still crash.


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--- Comment #11 from Etsushi Kato <ek.kato@...>  2009-09-12 21:37:20 PST ---
(In reply to comment #9)
> Created an attachment (id=29429)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29429) [details]
> full backtrace of gdb
>
> qtconfig loads /usr/lib/qt4/plugins/inputmethods/libuiminputcontextplugin.so
> (#70-72) when started.


OK.  As I said before, I'm curious why /usr/qt/3/lib/libqt-mt.so.3 is loaded
with Qt4 application.  Could you show me the output of 'ldd
/usr/lib/qt4/plugins/inputmethods/libuiminputcontextplugin.so'?  If it contain
libqt-mt.so.3, something is wrong in build script (Makefile) on Gentoo.  If it
doesn't, I'm totally not sure what is going on.


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--- Comment #12 from Muneyuki Noguchi <nogu.dev@...>  2009-09-16 06:21:02 PST ---
Created an attachment (id=29592)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29592)
ldd /usr/lib/qt4/plugins/inputmethods/libuiminputcontextplugin.so

$ ldd /usr/lib/qt4/plugins/inputmethods/libuiminputcontextplugin.so |grep -i qt
        libQt3Support.so.4 => /usr/lib/qt4/libQt3Support.so.4 (0x6fc62000)
        libQtSql.so.4 => /usr/lib/qt4/libQtSql.so.4 (0x6fc0a000)
        libQtXml.so.4 => /usr/lib/qt4/libQtXml.so.4 (0x6fba6000)
        libQtNetwork.so.4 => /usr/lib/qt4/libQtNetwork.so.4 (0x6fa91000)
        libQtGui.so.4 => /usr/lib/qt4/libQtGui.so.4 (0x6f1b6000)
        libQtCore.so.4 => /usr/lib/qt4/libQtCore.so.4 (0x6eada000)


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--- Comment #13 from Muneyuki Noguchi <nogu.dev@...>  2009-09-16 07:04:58 PST ---
Qt4 applications don't crash with the following configuration (libnotify
instead of knotify3):

./configure --prefix=/usr --build=powerpc-unknown-linux-gnu
--host=powerpc-unknown-linux-gnu --mandir=/usr/share/man
--infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
--localstatedir=/var/lib --with-x --without-canna --without-eb --disable-emacs
--without-lispdir --disable-gnome-applet --with-gtk2 --with-libedit
--enable-kde-applet --with-m17nlib --enable-fep --enable-nls --without-prime
--with-qt --with-qt-immodule --with-qt4-immodule --without-xft --enable-dict
--enable-pref --with-anthy-utf8 --enable-notify=libnotify

The bug may have something to do with Gentoo's original patch.


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Etsushi Kato <ek.kato@...> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED




--- Comment #14 from Etsushi Kato <ek.kato@...>  2009-09-16 18:49:06 PST ---
(In reply to comment #13)
> Qt4 applications don't crash with the following configuration (libnotify
> instead of knotify3):

Aha!  It is a bug in uim configuration for notify that knotify3 should not be
enabled when Qt4 immodule is used or enabled.  Thanks for your effort and time
to discover this.  I'll fix this problem in the next version of uim.

> The bug may have something to do with Gentoo's original patch.

No.  Actually, a bug in uim.

Cheers,


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Etsushi Kato <ek.kato@...> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED




--- Comment #15 from Etsushi Kato <ek.kato@...>  2009-09-16 19:06:21 PST ---
Fixed in r6000.


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