Application: dolphin (17.04.1)

Qt Version: 5.9.2
Frameworks Version: 5.40.0
Operating System: Linux 4.14.8-200.fc26.x86_64 x86_64
Distribution (Platform): Fedora RPMs

-- Information about the crash:
- What I was doing when the application crashed:
I have two nfs mounts (on a qnap NAS box). Both are configured for 'user' mount,

/etc/fstab
tree:/share/CACHEDEV1_DATA/testshare /opt/nas/testshare  nfs nfsvers=3,rw,noauto,user,hard 0 0
tree:/share/CACHEDEV1_DATA/wavs /opt/nas/wavs  nfs nfsvers=3,rw,noauto,user,hard 0 0

I context-clicked for pop-up menu and hit Unmount for each in turn, say 2 seconds apart.
After 10-15 seconds the second disk had not yet unmounted,
so I repeated menu pop-up for second disk. Crash then occurred.

It usually takes about 4-5 seconds to un-mount disk, to perhaps this is a timing or resource locking issue,
having issued the second un-mount before the 1st have completed.

-- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fa6bb95e940 (LWP 1395))]

Thread 4 (Thread 0x7fa6a22a3700 (LWP 2275)):
#0  0x00007fa6c7b7ad2d in poll () from /lib64/libc.so.6
#1  0x00007fa6c08a8579 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fa6c08a868c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007fa6c89a249b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fa6c895022a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fa6c87a199a in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007fa6c87a5c72 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#7  0x00007fa6c546c36d in start_thread () from /lib64/libpthread.so.0
#8  0x00007fa6c7b86e1f in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fa6b120f700 (LWP 1407)):
#0  0x00007fa6c7b7ad2d in poll () from /lib64/libc.so.6
#1  0x00007fa6c08a8579 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fa6c08a868c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007fa6c89a249b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fa6c895022a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fa6c87a199a in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007fa6c8bbe689 in QDBusConnectionManager::run() () from /lib64/libQt5DBus.so.5
#7  0x00007fa6c87a5c72 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fa6c546c36d in start_thread () from /lib64/libpthread.so.0
#9  0x00007fa6c7b86e1f in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fa6b2c2f700 (LWP 1405)):
#0  0x00007fa6c7b7ad2d in poll () from /lib64/libc.so.6
#1  0x00007fa6c0231c97 in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007fa6c0233a8a in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007fa6b4d94379 in QXcbEventReader::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007fa6c87a5c72 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007fa6c546c36d in start_thread () from /lib64/libpthread.so.0
#6  0x00007fa6c7b86e1f in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fa6bb95e940 (LWP 1395)):
[KCrash Handler]
#6  0x00007fa6c88de784 in QProcess::setProcessState(QProcess::ProcessState) () from /lib64/libQt5Core.so.5
#7  0x00007fa6c88de7c4 in QProcessPrivate::cleanup() () from /lib64/libQt5Core.so.5
#8  0x00007fa6c88dec3b in QProcess::~QProcess() () from /lib64/libQt5Core.so.5
#9  0x00007fa6c88dee79 in QProcess::~QProcess() () from /lib64/libQt5Core.so.5
#10 0x00007fa6cca77487 in Solid::Backends::Fstab::FstabStorageAccess::slotTeardownFinished(int, QProcess::ExitStatus) () from /lib64/libKF5Solid.so.5
#11 0x00007fa6cca80a71 in Solid::Backends::Fstab::FstabStorageAccess::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libKF5Solid.so.5
#12 0x00007fa6c8979d03 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#13 0x00007fa6c88ddc8f in QProcess::finished(int, QProcess::ExitStatus) () from /lib64/libQt5Core.so.5
#14 0x00007fa6c88e2a82 in QProcessPrivate::_q_processDied() () from /lib64/libQt5Core.so.5
#15 0x00007fa6c88e2b89 in QProcess::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libQt5Core.so.5
#16 0x00007fa6c8979d03 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#17 0x00007fa6c8985b08 in QSocketNotifier::activated(int, QSocketNotifier::QPrivateSignal) () from /lib64/libQt5Core.so.5
#18 0x00007fa6c8985ed2 in QSocketNotifier::event(QEvent*) () from /lib64/libQt5Core.so.5
#19 0x00007fa6c9492c9c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#20 0x00007fa6c949a4e4 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#21 0x00007fa6c89514a7 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#22 0x00007fa6c89a2dff in socketNotifierSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#23 0x00007fa6c08a8257 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#24 0x00007fa6c08a85f8 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#25 0x00007fa6c08a868c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#26 0x00007fa6c89a247f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#27 0x00007fa6c895022a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#28 0x00007fa6c8958884 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#29 0x00007fa6cf02919a in kdemain () from /lib64/libkdeinit5_dolphin.so
#30 0x00007fa6c7a9688a in __libc_start_main () from /lib64/libc.so.6
#31 0x0000558d6b01cada in _start ()

Reported using DrKonqi