Bug 370336 - Changing rendering backend hangs session
Summary: Changing rendering backend hangs session
Status: RESOLVED FIXED
Alias: None
Product: kwin
Classification: Plasma
Component: wayland-generic (show other bugs)
Version: git master
Platform: Neon Linux
: NOR crash
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
: 374652 (view as bug list)
Depends on:
Blocks:
 
Reported: 2016-10-09 10:13 UTC by Roman Gilg
Modified: 2017-12-29 21:06 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:
mgraesslin: Wayland+

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Description Roman Gilg 2016-10-09 10:13:29 UTC 
Switching between OpenGL2 and 3 fades to black and hangs graphical interface. Needs reboot (can be done for example with hardwarekey gracefully if configured).

Reproducible: Always
Comment 1 Martin Flöser 2016-11-22 13:57:21 UTC 
backtrace from when it happens:

Thread 1 "kwin_wayland" received signal SIGINT, Interrupt.
0x00007fa45a634b5d in poll () at ../sysdeps/unix/syscall-template.S:84
84      in ../sysdeps/unix/syscall-template.S
(gdb) t a a bt

Thread 11 (Thread 0x7fa43707a700 (LWP 1564)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fa45af56986 in QWaitConditionPrivate::wait_relative (time=30000, this=0x18e8130) at thread/qwaitcondition_unix.cpp:133
#2  QWaitConditionPrivate::wait (time=30000, this=0x18e8130) at thread/qwaitcondition_unix.cpp:141
#3  QWaitCondition::wait (this=this@entry=0x18e7f70, mutex=mutex@entry=0x23a24c0, time=30000) at thread/qwaitcondition_unix.cpp:215
#4  0x00007fa45af5223a in QThreadPoolThread::run (this=0x18e7f60) at thread/qthreadpool.cpp:133
#5  0x00007fa45af55b98 in QThreadPrivate::start (arg=0x18e7f60) at thread/qthread_unix.cpp:344
#6  0x00007fa45bec470a in start_thread (arg=0x7fa43707a700) at pthread_create.c:333
#7  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7fa422f44700 (LWP 1563)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fa45af56986 in QWaitConditionPrivate::wait_relative (time=30000, this=0x2487e90) at thread/qwaitcondition_unix.cpp:133
#2  QWaitConditionPrivate::wait (time=30000, this=0x2487e90) at thread/qwaitcondition_unix.cpp:141
#3  QWaitCondition::wait (this=this@entry=0x1bec680, mutex=mutex@entry=0x23a24c0, time=30000) at thread/qwaitcondition_unix.cpp:215
#4  0x00007fa45af5223a in QThreadPoolThread::run (this=0x1bec670) at thread/qthreadpool.cpp:133
#5  0x00007fa45af55b98 in QThreadPrivate::start (arg=0x1bec670) at thread/qthread_unix.cpp:344
#6  0x00007fa45bec470a in start_thread (arg=0x7fa422f44700) at pthread_create.c:333
#7  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7fa422743700 (LWP 1288)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fa459f305c4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fa459f30609 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fa45bec470a in start_thread (arg=0x7fa422743700) at pthread_create.c:333
#4  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7fa423745700 (LWP 1286)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fa45af56a4b in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x268a080) at thread/qwaitcondition_unix.cpp:143
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x2689aa8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:215
#3  0x00007fa435246482 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/Qt/labs/folderlistmodel/libqmlfolderlistmodelplugin.so
#4  0x00007fa45af55b98 in QThreadPrivate::start (arg=0x2689a98) at thread/qthread_unix.cpp:344
#5  0x00007fa45bec470a in start_thread (arg=0x7fa423745700) at pthread_create.c:333
#6  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7fa423fff700 (LWP 1285)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fa45af56a4b in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x2689370) at thread/qwaitcondition_unix.cpp:143
#2  QWaitCondition::wait (this=this@entry=0x27058c8, mutex=mutex@entry=0x27058c0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:215
#3  0x00007fa45af4fbfb in QSemaphore::acquire (this=0x2705208, n=1) at thread/qsemaphore.cpp:143
---Type <return> to continue, or q <return> to quit---
#4  0x00007fa444fc6578 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so
#5  0x00007fa45af55b98 in QThreadPrivate::start (arg=0x27051f0) at thread/qthread_unix.cpp:344
#6  0x00007fa45bec470a in start_thread (arg=0x7fa423fff700) at pthread_create.c:333
#7  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fa43502b700 (LWP 1284)):
#0  0x00007fa45a634b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa452f2739c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa452f274ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa45b18121f in QEventDispatcherGlib::processEvents (this=0x7fa4280008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#4  0x00007fa45b12bcea in QEventLoop::exec (this=this@entry=0x7fa43502ac60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:210
#5  0x00007fa45af50fb4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:507
#6  0x00007fa45624f675 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fa45af55b98 in QThreadPrivate::start (arg=0x2633100) at thread/qthread_unix.cpp:344
#8  0x00007fa45bec470a in start_thread (arg=0x7fa43502b700) at pthread_create.c:333
#9  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fa43666a700 (LWP 1283)):
#0  0x00007fa45a634b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa452f2739c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa452f274ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa45b18123b in QEventDispatcherGlib::processEvents (this=0x7fa4240008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fa45b12bcea in QEventLoop::exec (this=this@entry=0x7fa436669c60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:210
#5  0x00007fa45af50fb4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:507
#6  0x00007fa45624f675 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fa45af55b98 in QThreadPrivate::start (arg=0x25769a0) at thread/qthread_unix.cpp:344
#8  0x00007fa45bec470a in start_thread (arg=0x7fa43666a700) at pthread_create.c:333
#9  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fa43e9c2700 (LWP 1265)):
#0  0x00007fa45a634b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa452f2739c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa452f274ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa45b18121f in QEventDispatcherGlib::processEvents (this=0x7fa4300008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#4  0x00007fa45b12bcea in QEventLoop::exec (this=this@entry=0x7fa43e9c1c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:210
#5  0x00007fa45af50fb4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:507
#6  0x00007fa45af55b98 in QThreadPrivate::start (arg=0x1ab4db0) at thread/qthread_unix.cpp:344
#7  0x00007fa45bec470a in start_thread (arg=0x7fa43e9c2700) at pthread_create.c:333
#8  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fa43fdd7700 (LWP 1264)):
#0  0x00007fa45a634b5d in poll () at ../sysdeps/unix/syscall-template.S:84
---Type <return> to continue, or q <return> to quit---
#1  0x00007fa452f2739c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa452f274ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa45b18121f in QEventDispatcherGlib::processEvents (this=0x7fa4380008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#4  0x00007fa45b12bcea in QEventLoop::exec (this=this@entry=0x7fa43fdd6c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:210
#5  0x00007fa45af50fb4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:507
#6  0x00007fa45af55b98 in QThreadPrivate::start (arg=0x194e4a0) at thread/qthread_unix.cpp:344
#7  0x00007fa45bec470a in start_thread (arg=0x7fa43fdd7700) at pthread_create.c:333
#8  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fa4448ad700 (LWP 1263)):
#0  0x00007fa45a634b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa452f2739c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa452f274ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa45b18123b in QEventDispatcherGlib::processEvents (this=0x7fa4400008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fa45b12bcea in QEventLoop::exec (this=this@entry=0x7fa4448acc50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:210
#5  0x00007fa45af50fb4 in QThread::exec (this=this@entry=0x7fa45cec0d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:507
#6  0x00007fa45ce4c7a5 in QDBusConnectionManager::run (this=0x7fa45cec0d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:196
#7  0x00007fa45af55b98 in QThreadPrivate::start (arg=0x7fa45cec0d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:344
#8  0x00007fa45bec470a in start_thread (arg=0x7fa4448ad700) at pthread_create.c:333
#9  0x00007fa45a64082d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fa45cd24940 (LWP 1262)):
#0  0x00007fa45a634b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa45b17c544 in poll (__timeout=<optimized out>, __nfds=13, __fds=0x23a2958) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  qt_ppoll (timeout_ts=<synthetic pointer>, nfds=13, fds=0x23a2958) at kernel/qcore_unix.cpp:93
#3  qt_safe_poll (fds=0x23a2958, nfds=nfds@entry=13, timeout_ts=timeout_ts@entry=0x7ffe48df2430) at kernel/qcore_unix.cpp:121
#4  0x00007fa45b17dee8 in QEventDispatcherUNIX::processEvents (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:495
#5  0x00007fa4462e839d in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/KWinQpaPlugin.so
#6  0x00007fa45b12bcea in QEventLoop::exec (this=this@entry=0x7ffe48df2570, flags=..., flags@entry=...) at kernel/qeventloop.cpp:210
#7  0x00007fa45b1342fc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1261
#8  0x0000000000408744 in ?? ()
#9  0x00007fa45a55a830 in __libc_start_main (main=0x406af0, argc=4, argv=0x7ffe48df2ad8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe48df2ac8) at ../csu/libc-start.c:291
#10 0x0000000000408bd9 in _start ()

--
looks like it "just" doesn't render any more.
Comment 2 Martin Flöser 2017-03-19 12:52:00 UTC 
*** Bug 374652 has been marked as a duplicate of this bug. ***
Comment 3 Martin Flöser 2017-10-04 19:35:36 UTC 
I'm no longer able to reproduce the issue. I can change backends without hanging the session, also in general we have unit tests for it now. So I dare to say it's a worksforme.

But I sometimes get a crash in DRM: #385372
Comment 4 Martin Flöser 2017-12-29 21:06:59 UTC 
Setting to fixed as it's no longer reproducable.