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Bug#843511: marked as done (libqt5widgets5: Some Qt applications segfault on startup)

Your message dated Mon, 7 Nov 2016 13:05:29 +0300
with message-id <20161107100529.xociumz4esje7cks@mitya57.me>
and subject line Re: Bug#843511: libqt5widgets5: Some Qt applications segfault on startup
has caused the Debian Bug report #843511,
regarding libqt5widgets5: Some Qt applications segfault on startup
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
843511: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=843511
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: libqt5widgets5
Version: 5.7.1~20161021+dfsg-5
Severity: grave
Justification: renders package unusable

Dear Maintainer,

After upgrading to Qt 5.7, some applications fail to launch an segfault instead.

For example, here's lxqt-powermanagement:
#0  0x0000000000000000 in ?? ()
#1  0x00007ffff70c630e in copyActionToPlatformItem (action=action@entry=0x5555558556b0, item=item@entry=0x55555585fbe0, itemsMenu=0x55555585a0a0) at widgets/qmenu.cpp:3277
#2  0x00007ffff70c5f11 in QMenuPrivate::syncPlatformMenu (this=0x55555585a4d0) at widgets/qmenu.cpp:192
#3  0x00007ffff70c6027 in QMenu::setPlatformMenu (this=this@entry=0x555555852498, platformMenu=<optimized out>) at widgets/qmenu.cpp:3482
#4  0x00007ffff72afeb5 in QSystemTrayIconPrivate::addPlatformMenu (this=0x5555558524d0, menu=0x555555852498) at util/qsystemtrayicon.cpp:767
#5  0x00007ffff72aff92 in QSystemTrayIconPrivate::updateMenu_sys_qpa (this=0x5555558524d0) at util/qsystemtrayicon.cpp:716
#6  0x00007ffff72cdabf in QSystemTrayIconPrivate::updateMenu_sys (this=<optimized out>) at util/qsystemtrayicon_x11.cpp:320
#7  0x00007ffff72af4f6 in QSystemTrayIcon::setContextMenu (this=this@entry=0x555555852430, menu=menu@entry=0x555555852498) at util/qsystemtrayicon.cpp:177
#8  0x0000555555564279 in TrayIcon::TrayIcon (this=0x555555852430, battery=<optimized out>, parent=<optimized out>) at ./src/trayicon.cpp:65
#9  0x0000555555560c4e in BatteryWatcher::settingsChanged (this=0x5555558256c0) at ./src/batterywatcher.cpp:171
#10 0x0000555555560ffd in BatteryWatcher::BatteryWatcher (this=0x5555558256c0, parent=<optimized out>) at ./src/batterywatcher.cpp:69
#11 0x0000555555563310 in PowerManagementd::settingsChanged (this=this@entry=0x7fffffffdf60) at ./src/powermanagementd.cpp:62
#12 0x0000555555563976 in PowerManagementd::PowerManagementd (this=0x7fffffffdf60) at ./src/powermanagementd.cpp:46
#13 0x000055555555d177 in main (argc=<optimized out>, argv=<optimized out>) at ./src/main.cpp:49

And here is owncloud:
#0  0x0000000000000000 in ?? ()
#1  0x00007ffff52c630e in copyActionToPlatformItem (action=0x555555abebd0, item=item@entry=0x555555abf110, itemsMenu=0x555555ba5070) at widgets/qmenu.cpp:3277
#2  0x00007ffff52c9a4d in QMenu::actionEvent (this=0x555555b4f420, e=0x7fffffffd720) at widgets/qmenu.cpp:3339
#3  0x00007ffff51a11d8 in QWidget::event (this=this@entry=0x555555b4f420, event=event@entry=0x7fffffffd720) at kernel/qwidget.cpp:9161
#4  0x00007ffff52cf773 in QMenu::event (this=0x555555b4f420, e=0x7fffffffd720) at widgets/qmenu.cpp:2799
#5  0x00007ffff5159b2c in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x555555b4f420, e=0x7fffffffd720) at kernel/qapplication.cpp:3799
#6  0x00007ffff51612e1 in QApplication::notify (this=0x7fffffffdef0, receiver=0x555555b4f420, e=0x7fffffffd720) at kernel/qapplication.cpp:3556
#7  0x00007ffff47030e0 in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0x555555b4f420, event=event@entry=0x7fffffffd720) at kernel/qcoreapplication.cpp:988
#8  0x00007ffff51985f8 in QCoreApplication::sendEvent (event=0x7fffffffd720, receiver=0x555555b4f420) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#9  QWidget::insertAction (this=this@entry=0x555555b4f420, before=<optimized out>, before@entry=0x0, action=action@entry=0x555555abebd0) at kernel/qwidget.cpp:3337
#10 0x00007ffff519875a in QWidget::addAction (this=this@entry=0x555555b4f420, action=action@entry=0x555555abebd0) at kernel/qwidget.cpp:3288
#11 0x00007ffff52c54d0 in QMenu::addAction (this=0x555555b4f420, text=...) at widgets/qmenu.cpp:1534
#12 0x000055555562aa01 in OCC::ownCloudGui::addAccountContextMenu(QExplicitlySharedDataPointer<OCC::AccountState>, QMenu*, bool) ()
#13 0x000055555562bfd8 in OCC::ownCloudGui::setupContextMenu() ()
#14 0x000055555562c868 in OCC::ownCloudGui::ownCloudGui(OCC::Application*) ()
#15 0x00005555555e6c76 in OCC::Application::Application(int&, char**) ()
#16 0x00005555555d0098 in main ()

This seems to have something to do with the platform integration.  I am using LXQt as my DE.
I noticed lxqt-qtplugin has not been re-build and is not even part of the transition, maybe it should be?
I have version 0.11.0-3 installed.

Kind regards,
Ralf

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable-debug'), (100, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libqt5widgets5 depends on:
ii  libc6                            2.24-5
ii  libqt5core5a [qtbase-abi-5-7-1]  5.7.1~20161021+dfsg-5
ii  libqt5gui5                       5.7.1~20161021+dfsg-5
ii  libstdc++6                       6.2.0-10

libqt5widgets5 recommends no packages.

libqt5widgets5 suggests no packages.

-- no debconf information

--- End Message ---
--- Begin Message --- 
Hi Ralf,

On Mon, Nov 07, 2016 at 10:55:19AM +0100, Ralf Jung wrote:
> Hi again,
>
> I managed to fix the crashes by re-building lxqt-qtplugin against
> current unstable.  The bug this clearly is in lxqt-plugin, reported as
> #843512.  Still, Qt 5.7 should probably not transition to testing
> without a new version of lxqt-plugin.

Emilio has scheduled a lxqt-plugin rebuild now, so I am closing this bug.

I still hope to be able to refactor the Qt side of this so that platform
plugins do not need to link against the private static library, but this
is not a trivial issue.

See discussions at [1] (LXQt specific) and [2] (Qt in general) for details.

[1]: https://github.com/lxde/lxqt/issues/1082
[2]: http://lists.qt-project.org/pipermail/development/2016-October/027520.html

--
Dmitry Shachnev

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