https://bugs.kde.org/show_bug.cgi?id=442104
Bug ID: 442104
Summary: kwin_wayland segmentation faulted in
KWin::LibInput::Context::closeRestricted when logging
out of Plasma with libinput-1.18.901-1.fc35
Product: kwin
Version: 5.22.5
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: libinput
Assignee: kwin-bugs-n...@kde.org
Reporter: matthew.fagn...@utoronto.ca
Target Milestone: ---
SUMMARY
kwin_wayland segmentation faulted in KWin::LibInput::Context::closeRestricted
when logging out of Plasma 5.22.5 on Wayland in a Fedora 35 KDE Plasma
installation. The screen went black and then Plasma restarted.
Core was generated by `kwin_wayland --wayland_fd 4 --xwayland
/usr/libexec/startplasma-waylandsession'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007fe383646a95 in KWin::LibInput::Context::closeRestricted
(this=0x558b8b8fb7a0, fd=33) at
/usr/src/debug/kwin-5.22.5-1.fc35.x86_64/src/libinput/context.cpp:146
Downloading source file
/usr/src/debug/kwin-5.22.5-1.fc35.x86_64/src/libinput/context.cpp...
146 kwinApp()->platform()->session()->closeRestricted(fd);
[Current thread is 1 (Thread 0x7fe36d78d640 (LWP 2255))]
(gdb) bt
#0 0x00007fe383646a95 in KWin::LibInput::Context::closeRestricted(int)
(this=0x558b8b8fb7a0, fd=33)
at /usr/src/debug/kwin-5.22.5-1.fc35.x86_64/src/libinput/context.cpp:146
#1 KWin::LibInput::Context::closeRestrictedCallBack(int, void*) (fd=33,
user_data=0x558b8b8fb7a0)
at /usr/src/debug/kwin-5.22.5-1.fc35.x86_64/src/libinput/context.cpp:97
#2 0x00007fe380e19101 in close_restricted
(libinput=<optimized out>, libinput=0x558b8b8fb7c0, fd=<optimized out>) at
../src/libinput.c:2054
#3 evdev_device_suspend (device=device@entry=0x558b8b9b8bf0) at
../src/evdev.c:2871
#4 0x00007fe380e22e76 in evdev_device_remove (device=0x558b8b9b8bf0) at
../src/evdev.c:2961
#5 0x00007fe380e129e4 in evdev_device_dispatch (data=0x558b8b9b8bf0) at
../src/evdev.c:1144
#6 0x00007fe380e0e667 in libinput_dispatch (libinput=0x558b8b8fb7c0) at
../src/libinput.c:2209
#7 0x00007fe383646e7d in KWin::LibInput::Context::dispatch()
(this=<optimized out>, this=<optimized out>)
at /usr/src/debug/kwin-5.22.5-1.fc35.x86_64/src/libinput/context.cpp:80
#8 KWin::LibInput::Connection::handleEvent() (this=0x558b8b966300)
at /usr/src/debug/kwin-5.22.5-1.fc35.x86_64/src/libinput/connection.cpp:231
#9 0x00007fe381c573a9 in QtPrivate::QSlotObjectBase::call(QObject*, void**)
(a=0x7fe36d78c850, r=<optimized out>, this=0x7fe3640047b0)
at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#10 doActivate<false>(QObject*, int, void**)
(sender=0x7fe3640046d0, signal_index=3, argv=0x7fe36d78c850) at
kernel/qobject.cpp:3886
#11 0x00007fe381c52327 in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**)
(sender=sender@entry=0x7fe3640046d0, m=m@entry=0x7fe381efc460
<QSocketNotifier::staticMetaObject>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fe36d78c850)
at kernel/qobject.cpp:3946
#12 0x00007fe381c59b4a in QSocketNotifier::activated(QSocketDescriptor,
QSocketNotifier::Type, QSocketNotifier::QPrivateSignal)
(this=this@entry=0x7fe3640046d0, _t1=..., _t2=<optimized out>, _t3=...) at
.moc/moc_qsocketnotifier.cpp:178
#13 0x00007fe381c5a363 in QSocketNotifier::event(QEvent*) (this=0x7fe3640046d0,
e=0x7fe36d78c950) at kernel/qsocketnotifier.cpp:302
#14 0x00007fe3828b3443 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
(this=<optimized out>, receiver=0x7fe3640046d0, e=0x7fe36d78c950) at
kernel/qapplication.cpp:3632
#15 0x00007fe381c23798 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
(receiver=0x7fe3640046d0, event=0x7fe36d78c950) at
kernel/qcoreapplication.cpp:1064
#16 0x00007fe381c755ff in socketNotifierSourceDispatch(GSource*, GSourceFunc,
gpointer) (source=0x7fe364004470) at kernel/qeventdispatcher_glib.cpp:107
#17 0x00007fe37f2d233f in g_main_dispatch (context=0x7fe364000c20) at
../glib/gmain.c:3381
#18 g_main_context_dispatch (context=0x7fe364000c20) at ../glib/gmain.c:4099
#19 0x00007fe37f327288 in g_main_context_iterate.constprop.0
(context=context@entry=0x7fe364000c20, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4175
#20 0x00007fe37f2cf9e3 in g_main_context_iteration (context=0x7fe364000c20,
may_block=1) at ../glib/gmain.c:4240
#21 0x00007fe381c74b78 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x7fe364000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#22 0x00007fe381c221a2 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(this=this@entry=0x7fe36d78cbd0, flags=..., flags@entry=...) at
../../include/QtCore/../../src/corelib/global/qflags.h:69
#23 0x00007fe381a652aa in QThread::exec() (this=<optimized out>) at
../../include/QtCore/../../src/corelib/global/qflags.h:121
#24 0x00007fe381a664a6 in QThreadPrivate::start(void*) (arg=0x558b8b9bc0d0) at
thread/qthread_unix.cpp:329
#25 0x00007fe3813caaaf in start_thread (arg=<optimized out>) at
pthread_create.c:434
#26 0x00007fe38144f300 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
The crashes started after an update with updates-testing enabled which included
libinput-1.18.901-1.fc35 on 2021-9-3. I downgraded to libinput-1.18.1-1.fc35
and rebooted. The crashes didn't happen when logging out of Plasma with
libinput-1.18.1-1.fc35. A change between libinput-1.18.1-1.fc35 and
libinput-1.18.901-1.fc35 might be involved in these crashes. The crash happened
4/4 times when logging out of Plasma with libinput-1.18.901-1.fc35 using a
mouse, but it didn't happen when I logged out using a touchpad.
STEPS TO REPRODUCE
1. Boot a Fedora 35 KDE Plasma installation
2. Log in to Plasma on Wayland
3. Start konsole
4. sudo dnf offline-upgrade download
5. sudo dnf offline-upgrade reboot
6. Log in to Plasma on Wayland
7. Log out of Plasma by selecting the Application Launcher menu > Leave > Log
out > OK using a mouse
OBSERVED RESULT
kwin_wayland segmentation faulted in KWin::LibInput::Context::closeRestricted
when logging out of Plasma with libinput-1.18.901-1.fc35
EXPECTED RESULT
Plasma would log out normally.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 35
(available in About System)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
I reported this problem at https://bugzilla.redhat.com/show_bug.cgi?id=2001135
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