Bug 387706

Application: plasmashell (5.11.4)

Qt Version: 5.9.1
Frameworks Version: 5.40.0
Operating System: Linux 4.14.4-041404-generic x86_64
Distribution: Ubuntu 17.10

-- Information about the crash:
- What I was doing when the application crashed:

I had a pile of old DVD/BR data disks and was trying to mount them to check their contents.
At some point the mouting widgets became irresponsive and a bit later the crash report window appeared.

The crash does not seem to be reproducible.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff935807900 (LWP 2331))]

Thread 8 (Thread 0x7ff8659e3700 (LWP 2925)):
#0  0x00007ff92ee46901 in __GI___poll (fds=0x7ff8600029e0, nfds=1, timeout=2518908) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ff929a79169 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7ff8600029e0, timeout=<optimized out>, context=0x7ff860000be0) at ../../../../glib/gmain.c:4187
#2  0x00007ff929a79169 in g_main_context_iterate (context=context@entry=0x7ff860000be0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../glib/gmain.c:3881
#3  0x00007ff929a7927c in g_main_context_iteration (context=0x7ff860000be0, may_block=may_block@entry=1) at ../../../../glib/gmain.c:3947
#4  0x00007ff92f78649b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ff860000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007ff92f72be3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ff8659e2c70, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007ff92f54b3ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:515
#7  0x00007ff867ffc747 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007ff92f55029d in QThreadPrivate::start(void*) (arg=0x55c38d05a9a0) at thread/qthread_unix.cpp:368
#9  0x00007ff92e6e57fc in start_thread (arg=0x7ff8659e3700) at pthread_create.c:465
#10 0x00007ff92ee52b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7ff87a738700 (LWP 2649)):
#0  0x00007ff92f547b6f in QMutex::unlock() (this=this@entry=0x55c38ad82ad0) at thread/qmutex.cpp:337
#1  0x00007ff92f7868b7 in QMutexLocker::unlock() (this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:213
#2  0x00007ff92f7868b7 in QMutexLocker::~QMutexLocker() (this=<synthetic pointer>, __in_chrg=<optimized out>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:207
#3  0x00007ff92f7868b7 in QThreadData::canWaitLocked() (this=<optimized out>) at ../../include/QtCore/5.9.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:253
#4  0x00007ff92f7868b7 in postEventSourcePrepare (timeout=<synthetic pointer>, s=0x7ff874004b90) at kernel/qeventdispatcher_glib.cpp:259
#5  0x00007ff92f7868b7 in postEventSourceCheck(GSource*) (source=0x7ff874004b90) at kernel/qeventdispatcher_glib.cpp:269
#6  0x00007ff929a78b71 in g_main_context_check (context=context@entry=0x7ff874000be0, max_priority=2147483647, fds=fds@entry=0x7ff874005360, n_fds=n_fds@entry=1) at ../../../../glib/gmain.c:3719
#7  0x00007ff929a79110 in g_main_context_iterate (context=context@entry=0x7ff874000be0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../glib/gmain.c:3883
#8  0x00007ff929a7927c in g_main_context_iteration (context=0x7ff874000be0, may_block=may_block@entry=1) at ../../../../glib/gmain.c:3947
#9  0x00007ff92f78649b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ff874000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#10 0x00007ff92f72be3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ff87a737c40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#11 0x00007ff92f54b3ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:515
#12 0x00007ff933244846 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007ff92f55029d in QThreadPrivate::start(void*) (arg=0x55c38ad819e0) at thread/qthread_unix.cpp:368
#14 0x00007ff92e6e57fc in start_thread (arg=0x7ff87a738700) at pthread_create.c:465
#15 0x00007ff92ee52b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7ff9018e8700 (LWP 2590)):
#0  0x00007ff92e6ec072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7ff9351fafb8 <QTWTF::pageheap_memory+57592>) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007ff92e6ec072 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7ff9351faf68 <QTWTF::pageheap_memory+57512>, cond=0x7ff9351faf90 <QTWTF::pageheap_memory+57552>) at pthread_cond_wait.c:502
#2  0x00007ff92e6ec072 in __pthread_cond_wait (cond=0x7ff9351faf90 <QTWTF::pageheap_memory+57552>, mutex=0x7ff9351faf68 <QTWTF::pageheap_memory+57512>) at pthread_cond_wait.c:655
#3  0x00007ff934f06bd4 in QTWTF::TCMalloc_PageHeap::scavengerThread() (this=0x7ff9351ecec0 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#4  0x00007ff934f06c19 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*) (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#5  0x00007ff92e6e57fc in start_thread (arg=0x7ff9018e8700) at pthread_create.c:465
#6  0x00007ff92ee52b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7ff914976700 (LWP 2418)):
#0  0x00007ff92f547b6f in QMutex::unlock() (this=this@entry=0x55c38a57f510) at thread/qmutex.cpp:337
#1  0x00007ff92f7863cf in QMutexLocker::unlock() (this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:213
#2  0x00007ff92f7863cf in QMutexLocker::~QMutexLocker() (this=<synthetic pointer>, __in_chrg=<optimized out>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:207
#3  0x00007ff92f7863cf in QThreadData::canWaitLocked() (this=0x55c38a57f4e0) at ../../include/QtCore/5.9.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:253
#4  0x00007ff92f7863cf in postEventSourcePrepare(GSource*, gint*) (s=0x7ff90c004b90, timeout=timeout@entry=0x7ff914975ac4) at kernel/qeventdispatcher_glib.cpp:259
#5  0x00007ff929a786a8 in g_main_context_prepare (context=context@entry=0x7ff90c000be0, priority=priority@entry=0x7ff914975b50) at ../../../../glib/gmain.c:3450
#6  0x00007ff929a7909b in g_main_context_iterate (context=context@entry=0x7ff90c000be0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../glib/gmain.c:3866
#7  0x00007ff929a7927c in g_main_context_iteration (context=0x7ff90c000be0, may_block=may_block@entry=1) at ../../../../glib/gmain.c:3947
#8  0x00007ff92f78649b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ff90c000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#9  0x00007ff92f72be3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ff914975c90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#10 0x00007ff92f54b3ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:515
#11 0x00007ff9326aef45 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007ff92f55029d in QThreadPrivate::start(void*) (arg=0x55c38a581f80) at thread/qthread_unix.cpp:368
#13 0x00007ff92e6e57fc in start_thread (arg=0x7ff914976700) at pthread_create.c:465
#14 0x00007ff92ee52b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7ff916be9700 (LWP 2401)):
#0  0x00007ff92ee46901 in __GI___poll (fds=0x7ff9080029e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ff929a79169 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7ff9080029e0, timeout=<optimized out>, context=0x7ff908000be0) at ../../../../glib/gmain.c:4187
#2  0x00007ff929a79169 in g_main_context_iterate (context=context@entry=0x7ff908000be0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../glib/gmain.c:3881
#3  0x00007ff929a7927c in g_main_context_iteration (context=0x7ff908000be0, may_block=may_block@entry=1) at ../../../../glib/gmain.c:3947
#4  0x00007ff92f78649b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ff908000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007ff92f72be3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ff916be8c90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007ff92f54b3ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:515
#7  0x00007ff9326aef45 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007ff92f55029d in QThreadPrivate::start(void*) (arg=0x55c38a566650) at thread/qthread_unix.cpp:368
#9  0x00007ff92e6e57fc in start_thread (arg=0x7ff916be9700) at pthread_create.c:465
#10 0x00007ff92ee52b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7ff917fff700 (LWP 2366)):
#0  0x00007ff929a76081 in g_source_iter_next (iter=iter@entry=0x7ff917ffeac0, source=source@entry=0x7ff917ffeab8) at ../../../../glib/gmain.c:981
#1  0x00007ff929a78a81 in g_main_context_check (context=context@entry=0x7ff910000be0, max_priority=2147483647, fds=fds@entry=0x7ff91007bdd0, n_fds=n_fds@entry=1) at ../../../../glib/gmain.c:3699
#2  0x00007ff929a79110 in g_main_context_iterate (context=context@entry=0x7ff910000be0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../glib/gmain.c:3883
#3  0x00007ff929a7927c in g_main_context_iteration (context=0x7ff910000be0, may_block=may_block@entry=1) at ../../../../glib/gmain.c:3947
#4  0x00007ff92f78649b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ff910000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007ff92f72be3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ff917ffec80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007ff92f54b3ca in QThread::exec() (this=this@entry=0x7ff92fe75d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:515
#7  0x00007ff92fc02e45 in QDBusConnectionManager::run() (this=0x7ff92fe75d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#8  0x00007ff92f55029d in QThreadPrivate::start(void*) (arg=0x7ff92fe75d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:368
#9  0x00007ff92e6e57fc in start_thread (arg=0x7ff917fff700) at pthread_create.c:465
#10 0x00007ff92ee52b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7ff91e852700 (LWP 2355)):
#0  0x00007ff92ee46901 in __GI___poll (fds=fds@entry=0x7ff91e851bb8, nfds=nfds@entry=1, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ff933e4a747 in poll (__timeout=-1, __nfds=1, __fds=0x7ff91e851bb8) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  0x00007ff933e4a747 in _xcb_conn_wait (c=c@entry=0x55c38a4791f0, cond=cond@entry=0x55c38a479230, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:479
#3  0x00007ff933e4c53a in xcb_wait_for_event (c=0x55c38a4791f0) at ../../src/xcb_in.c:693
#4  0x00007ff920999f09 in QXcbEventReader::run() (this=0x55c38a483de0) at qxcbconnection.cpp:1322
#5  0x00007ff92f55029d in QThreadPrivate::start(void*) (arg=0x55c38a483de0) at thread/qthread_unix.cpp:368
#6  0x00007ff92e6e57fc in start_thread (arg=0x7ff91e852700) at pthread_create.c:465
#7  0x00007ff92ee52b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ff935807900 (LWP 2331)):
[KCrash Handler]
#6  0x00007ff9318292cf in KJob::finishJob(bool) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#7  0x00007ff8695d7270 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/dataengine/plasma_engine_soliddevice.so
#8  0x00007ff9339d5d21 in  () at /usr/lib/x86_64-linux-gnu/libKF5Plasma.so.5
#9  0x00007ff92f75d452 in QObject::event(QEvent*) (this=0x55c38e771db0, e=<optimized out>) at kernel/qobject.cpp:1246
#10 0x00007ff93073246c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x55c38a469950, receiver=receiver@entry=0x55c38e771db0, e=e@entry=0x55c38a69c340) at kernel/qapplication.cpp:3717
#11 0x00007ff930739d34 in QApplication::notify(QObject*, QEvent*) (this=0x7ffeea1479c0, receiver=0x55c38e771db0, e=0x55c38a69c340) at kernel/qapplication.cpp:3476
#12 0x00007ff92f72dde8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x55c38e771db0, event=event@entry=0x55c38a69c340) at kernel/qcoreapplication.cpp:1018
#13 0x00007ff92f73055d in QCoreApplication::sendEvent(QObject*, QEvent*) (event=0x55c38a69c340, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
#14 0x00007ff92f73055d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x55c38a45ebc0) at kernel/qcoreapplication.cpp:1678
#15 0x00007ff92f730ae8 in QCoreApplication::sendPostedEvents(QObject*, int) (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1532
#16 0x00007ff92f786e53 in postEventSourceDispatch(GSource*, GSourceFunc, gpointer) (s=s@entry=0x55c38a4acaf0) at kernel/qeventdispatcher_glib.cpp:276
#17 0x00007ff929a78fb7 in g_main_dispatch (context=0x7ff918004fc0) at ../../../../glib/gmain.c:3148
#18 0x00007ff929a78fb7 in g_main_context_dispatch (context=context@entry=0x7ff918004fc0) at ../../../../glib/gmain.c:3813
#19 0x00007ff929a791f0 in g_main_context_iterate (context=context@entry=0x7ff918004fc0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../glib/gmain.c:3886
#20 0x00007ff929a7927c in g_main_context_iteration (context=0x7ff918004fc0, may_block=may_block@entry=1) at ../../../../glib/gmain.c:3947
#21 0x00007ff92f78647f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55c38a4bebb0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#22 0x00007ff92f72be3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffeea1478c0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#23 0x00007ff92f734da4 in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1291
#24 0x000055c389091ebc in  ()
#25 0x00007ff92ed5f1c1 in __libc_start_main (main=0x55c3890914b0, argc=1, argv=0x7ffeea147b68, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffeea147b58) at ../csu/libc-start.c:308
#26 0x000055c38909225a in _start ()

Reported using DrKonqi