[Bug 1118327] Nextcloud client 100% cpu and crash at exit

http://bugzilla.opensuse.org/show_bug.cgi?id=1118327 http://bugzilla.opensuse.org/show_bug.cgi?id=1118327#c3 --- Comment #3 from Bruno Friedmann <bruno@ioda-net.ch> --- I'm now on new snapshot openSUSE Tumbleweed - 20181205 Linux 4.19.5-1-default x86_64 GNU/Linux, nvidia: 410.78 Qt: 5.11.2, KDE Frameworks: 5.52.0, Plasma: 5.14.4, kmail2 5.9.3 with nextcloud 2.5.1 installed S | Name | Type | Version | Arch | Repository ---+----------------------------+---------+-----------+--------+----------- i+ | libnextcloudsync0 | package | 2.5.1-1.1 | x86_64 | oss i+ | nextcloud-client | package | 2.5.1-1.1 | x86_64 | oss i+ | nextcloud-client-debuginfo | package | 2.5.1-1.1 | x86_64 | debug i+ | nextcloud-client-dolphin | package | 2.5.1-1.1 | x86_64 | oss And if I quit the application with systray I still see that kind of crash Application: nextcloud (nextcloud), signal: Segmentation fault Using host libthread_db library "/lib64/libthread_db.so.1". [Current thread is 1 (Thread 0x7fe4ced24f80 (LWP 2167))] Thread 9 (Thread 0x7fe4cbadd700 (LWP 14449)): #0 0x00007fe4d99a18c8 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fe4cbadca10, expected=0, futex_word=0x7fe4a0006e50) at ../sysdeps/unix/sysv/linux/futex-internal.h:142 #1 0x00007fe4d99a18c8 in __pthread_cond_wait_common (abstime=0x7fe4cbadcad0, mutex=0x7fe4a0006e00, cond=0x7fe4a0006e28) at pthread_cond_wait.c:533 #2 0x00007fe4d99a18c8 in __pthread_cond_timedwait (cond=0x7fe4a0006e28, mutex=0x7fe4a0006e00, abstime=0x7fe4cbadcad0) at pthread_cond_wait.c:667 #3 0x00007fe4da60c04c in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5 #4 0x00007fe4da603eb2 in () at /usr/lib64/libQt5Core.so.5 #5 0x00007fe4da60b9b7 in () at /usr/lib64/libQt5Core.so.5 #6 0x00007fe4d999b554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #7 0x00007fe4d9d3dccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 8 (Thread 0x7fe4bb7fe700 (LWP 14357)): #0 0x00007fe4d9d3f2c7 in socket () at ../sysdeps/unix/syscall-template.S:78 #1 0x00007fe4db7523fb in () at /usr/lib64/libQt5Network.so.5 #2 0x00007fe4db750b9e in () at /usr/lib64/libQt5Network.so.5 #3 0x00007fe4db73e4da in () at /usr/lib64/libQt5Network.so.5 #4 0x00007fe4db73f7a2 in () at /usr/lib64/libQt5Network.so.5 #5 0x00007fe4db73fccf in () at /usr/lib64/libQt5Network.so.5 #6 0x00007fe4db740185 in QAbstractSocket::connectToHost(QString const&, unsigned short, QFlags<QIODevice::OpenModeFlag>, QAbstractSocket::NetworkLayerProtocol) () at /usr/lib64/libQt5Network.so.5 #7 0x00007fe4db7797a5 in QSslSocket::connectToHost(QString const&, unsigned short, QFlags<QIODevice::OpenModeFlag>, QAbstractSocket::NetworkLayerProtocol) () at /usr/lib64/libQt5Network.so.5 #8 0x00007fe4db778faf in QSslSocket::connectToHostEncrypted(QString const&, unsigned short, QFlags<QIODevice::OpenModeFlag>, QAbstractSocket::NetworkLayerProtocol) () at /usr/lib64/libQt5Network.so.5 #9 0x00007fe4db6f3ea0 in () at /usr/lib64/libQt5Network.so.5 #10 0x00007fe4db6ee872 in () at /usr/lib64/libQt5Network.so.5 #11 0x00007fe4da7dd932 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5 #12 0x00007fe4db1544a1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5 #13 0x00007fe4db15baf0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5 #14 0x00007fe4da7b3e29 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5 #15 0x00007fe4da7b6e1b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQt5Core.so.5 #16 0x00007fe4da8064d3 in () at /usr/lib64/libQt5Core.so.5 #17 0x00007fe4e5481c15 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0 #18 0x00007fe4e5481fd8 in () at /usr/lib64/libglib-2.0.so.0 #19 0x00007fe4e548206c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #20 0x00007fe4da805b03 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #21 0x00007fe4da7b2afb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #22 0x00007fe4da601de6 in QThread::exec() () at /usr/lib64/libQt5Core.so.5 #23 0x00007fe4da60b9b7 in () at /usr/lib64/libQt5Core.so.5 #24 0x00007fe4d999b554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #25 0x00007fe4d9d3dccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 7 (Thread 0x7fe4b97fa700 (LWP 2940)): #0 0x00007fe4d9d2ed34 in __GI___libc_read (fd=36, buf=0x7fe4b97f9930, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27 #1 0x00007fe4e54c7a00 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007fe4e5481a4b in g_main_context_check () at /usr/lib64/libglib-2.0.so.0 #3 0x00007fe4e5481ef0 in () at /usr/lib64/libglib-2.0.so.0 #4 0x00007fe4e548206c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #5 0x00007fe4da805b1b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #6 0x00007fe4da7b2afb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #7 0x00007fe4da601de6 in QThread::exec() () at /usr/lib64/libQt5Core.so.5 #8 0x00007fe4da60b9b7 in () at /usr/lib64/libQt5Core.so.5 #9 0x00007fe4d999b554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #10 0x00007fe4d9d3dccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 6 (Thread 0x7fe4baffd700 (LWP 2574)): #0 0x00007fe4d9d332c9 in __GI___poll (fds=0x7fe4a80109a0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007fe4e5481f46 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007fe4e54822d2 in g_main_loop_run () at /usr/lib64/libglib-2.0.so.0 #3 0x00007fe4e52a2b16 in () at /usr/lib64/libgio-2.0.so.0 #4 0x00007fe4e54aa476 in () at /usr/lib64/libglib-2.0.so.0 #5 0x00007fe4d999b554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #6 0x00007fe4d9d3dccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 5 (Thread 0x7fe4bbfff700 (LWP 2572)): #0 0x00007fe4d9d2ed34 in __GI___libc_read (fd=28, buf=0x7fe4bbffea90, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27 #1 0x00007fe4e54c7a00 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007fe4e5481a4b in g_main_context_check () at /usr/lib64/libglib-2.0.so.0 #3 0x00007fe4e5481ef0 in () at /usr/lib64/libglib-2.0.so.0 #4 0x00007fe4e548206c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #5 0x00007fe4e54820b1 in () at /usr/lib64/libglib-2.0.so.0 #6 0x00007fe4e54aa476 in () at /usr/lib64/libglib-2.0.so.0 #7 0x00007fe4d999b554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #8 0x00007fe4d9d3dccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 4 (Thread 0x7fe4c2424700 (LWP 2314)): #0 0x00007fe4d9d332c9 in __GI___poll (fds=0x7fe4b4004a10, nfds=1, timeout=8354) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007fe4e5481f46 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007fe4e548206c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #3 0x00007fe4da805b1b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #4 0x00007fe4da7b2afb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #5 0x00007fe4da601de6 in QThread::exec() () at /usr/lib64/libQt5Core.so.5 #6 0x00007fe4da60b9b7 in () at /usr/lib64/libQt5Core.so.5 #7 0x00007fe4d999b554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #8 0x00007fe4d9d3dccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 3 (Thread 0x7fe4c8e45700 (LWP 2298)): #0 0x00007fe4d9d332c9 in __GI___poll (fds=0x7fe4bc036840, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007fe4e5481f46 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007fe4e548206c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #3 0x00007fe4da805b1b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #4 0x00007fe4da7b2afb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #5 0x00007fe4da601de6 in QThread::exec() () at /usr/lib64/libQt5Core.so.5 #6 0x00007fe4e4f3c545 in () at /usr/lib64/libQt5DBus.so.5 #7 0x00007fe4da60b9b7 in () at /usr/lib64/libQt5Core.so.5 #8 0x00007fe4d999b554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #9 0x00007fe4d9d3dccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 2 (Thread 0x7fe4cd32d700 (LWP 2203)): #0 0x00007fe4d99a14dc in futex_wait_cancelable (private=0, expected=0, futex_word=0x7fe4de60af30) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 #1 0x00007fe4d99a14dc in __pthread_cond_wait_common (abstime=0x0, mutex=0x55d22c1eb4a0, cond=0x7fe4de60af08) at pthread_cond_wait.c:502 #2 0x00007fe4d99a14dc in __pthread_cond_wait (cond=0x7fe4de60af08, mutex=0x55d22c1eb4a0) at pthread_cond_wait.c:655 #3 0x00007fe4da46e87c in std::condition_variable::wait(std::unique_lock<std::mutex>&) () at /usr/lib64/libstdc++.so.6 #4 0x00007fe4ddb632d2 in () at /usr/lib64/libQt5WebKit.so.5 #5 0x00007fe4ddb633eb in () at /usr/lib64/libQt5WebKit.so.5 #6 0x00007fe4da4740bf in () at /usr/lib64/libstdc++.so.6 #7 0x00007fe4d999b554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #8 0x00007fe4d9d3dccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 1 (Thread 0x7fe4ced24f80 (LWP 2167)): [KCrash Handler] #6 0x00007fe4e52ac2a8 in g_dbus_object_get_object_path () at /usr/lib64/libgio-2.0.so.0 #7 0x00007fe4e4fc7c1d in cloud_providers_provider_exporter_remove_account () at /usr/lib64/libcloudproviders.so.0 #8 0x000055d22b4c0271 in CloudProviderManager::slotFolderListChanged(QMap<QString, OCC::Folder*> const&) (this=0x55d22c9835a0, folderMap=...) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/src/gui/cloudproviders/cloudprovidermanager.cpp:57 #9 0x00007fe4da7dd07b in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5 #10 0x000055d22b4c8a65 in OCC::FolderMan::folderListChanged(QMap<QString, OCC::Folder*> const&) (this=this@entry=0x55d22c6abe40, _t1=...) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/build/src/gui/nextcloud_autogen/EWIEGA46WW/moc_folderman.cpp:286 #11 0x000055d22b3f25b1 in OCC::FolderMan::unloadAndDeleteAllFolders() (this=0x55d22c6abe40) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/src/gui/folderman.cpp:143 #12 0x000055d22b3d6ca3 in OCC::Application::slotCleanup() (this=0x7ffd99033860) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/src/gui/application.cpp:308 #13 0x00007fe4da7dd1d0 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5 #14 0x00007fe4da7b3007 in QCoreApplication::aboutToQuit(QCoreApplication::QPrivateSignal) () at /usr/lib64/libQt5Core.so.5 #15 0x00007fe4da7b72a9 in QCoreApplicationPrivate::execCleanup() () at /usr/lib64/libQt5Core.so.5 #16 0x00007fe4da7bac8b in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5 #17 0x000055d22b3c16bc in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/src/gui/main.cpp:167 [Inferior 1 (process 2167) detached] Afterward I restart the apps, and fix one file conflict, try anoter quit Then again try to quit the application, (this time I've put gdb attach first [New Thread 0x7ff415ffb700 (LWP 27731)] Thread 1 "nextcloud" received signal SIGSEGV, Segmentation fault. 0x00007ff45323a2a8 in g_dbus_object_get_object_path () from /usr/lib64/libgio-2.0.so.0 (gdb) thread apply all bt Thread 11 (Thread 0x7ff415ffb700 (LWP 27731)): #0 0x00007ff44792f8c8 in futex_reltimed_wait_cancelable (private=0, reltime=0x7ff415ffaa10, expected=0, futex_word=0x7ff410005f44) at ../sysdeps/unix/sysv/linux/futex-internal.h:142 #1 0x00007ff44792f8c8 in __pthread_cond_wait_common (abstime=0x7ff415ffaad0, mutex=0x7ff410005ef0, cond=0x7ff410005f18) at pthread_cond_wait.c:533 #2 0x00007ff44792f8c8 in __pthread_cond_timedwait (cond=0x7ff410005f18, mutex=0x7ff410005ef0, abstime=0x7ff415ffaad0) at pthread_cond_wait.c:667 #3 0x00007ff44859a04c in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5 #4 0x00007ff448591eb2 in () at /usr/lib64/libQt5Core.so.5 #5 0x00007ff4485999b7 in () at /usr/lib64/libQt5Core.so.5 #6 0x00007ff447929554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #7 0x00007ff447ccbccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 9 (Thread 0x7ff414ff9700 (LWP 14448)): #0 0x00007ff447cc12c9 in __GI___poll (fds=0x7ff3f8003ce0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007ff45340ff46 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007ff45341006c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #3 0x00007ff448793b03 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #4 0x00007ff448740afb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #5 0x00007ff44858fde6 in QThread::exec() () at /usr/lib64/libQt5Core.so.5 #6 0x00007ff4485999b7 in () at /usr/lib64/libQt5Core.so.5 #7 0x00007ff447929554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #8 0x00007ff447ccbccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 8 (Thread 0x7ff428e39700 (LWP 14437)): #0 0x00007ff447cc12c9 in __GI___poll (fds=0x7ff410043600, nfds=2, timeout=135399) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007ff45340ff46 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007ff45341006c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #3 0x00007ff448793b03 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #4 0x00007ff448740afb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #5 0x00007ff44858fde6 in QThread::exec() () at /usr/lib64/libQt5Core.so.5 #6 0x00007ff4485999b7 in () at /usr/lib64/libQt5Core.so.5 #7 0x00007ff447929554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #8 0x00007ff447ccbccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 7 (Thread 0x7ff42966f700 (LWP 14434)): #0 0x00007ff447cc12c9 in __GI___poll (fds=0x7ff4180109c0, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007ff45340ff46 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007ff4534102d2 in g_main_loop_run () at /usr/lib64/libglib-2.0.so.0 #3 0x00007ff453230b16 in () at /usr/lib64/libgio-2.0.so.0 #4 0x00007ff453438476 in () at /usr/lib64/libglib-2.0.so.0 #5 0x00007ff447929554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #6 0x00007ff447ccbccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 6 (Thread 0x7ff42a671700 (LWP 14432)): #0 0x00007ff447cc12c9 in __GI___poll (fds=0x561d43e379f0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007ff45340ff46 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007ff45341006c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #3 0x00007ff4534100b1 in () at /usr/lib64/libglib-2.0.so.0 --Type <RET> for more, q to quit, c to continue without paging--c #4 0x00007ff453438476 in () at /usr/lib64/libglib-2.0.so.0 #5 0x00007ff447929554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #6 0x00007ff447ccbccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 5 (Thread 0x7ff4309f4700 (LWP 14420)): #0 0x00007ff447cc12c9 in __GI___poll (fds=0x7ff424004a10, nfds=1, timeout=9991) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007ff45340ff46 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007ff45341006c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #3 0x00007ff448793b03 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #4 0x00007ff448740afb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #5 0x00007ff44858fde6 in QThread::exec() () at /usr/lib64/libQt5Core.so.5 #6 0x00007ff4485999b7 in () at /usr/lib64/libQt5Core.so.5 #7 0x00007ff447929554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #8 0x00007ff447ccbccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 4 (Thread 0x7ff4311f5700 (LWP 14419)): #0 0x00007ff447cc12c9 in __GI___poll (fds=0x7ff42c037a50, nfds=5, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007ff45340ff46 in () at /usr/lib64/libglib-2.0.so.0 #2 0x00007ff45341006c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 #3 0x00007ff448793b03 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #4 0x00007ff448740afb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5 #5 0x00007ff44858fde6 in QThread::exec() () at /usr/lib64/libQt5Core.so.5 #6 0x00007ff452eca545 in () at /usr/lib64/libQt5DBus.so.5 #7 0x00007ff4485999b7 in () at /usr/lib64/libQt5Core.so.5 #8 0x00007ff447929554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #9 0x00007ff447ccbccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 3 (Thread 0x7ff439aa2700 (LWP 14418)): #0 0x00007ff447cc12c9 in __GI___poll (fds=0x7ff439aa1a78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007ff445829cc7 in () at /usr/lib64/libxcb.so.1 #2 0x00007ff44582b8ea in xcb_wait_for_event () at /usr/lib64/libxcb.so.1 #3 0x00007ff43a59a519 in () at /usr/lib64/libQt5XcbQpa.so.5 #4 0x00007ff4485999b7 in () at /usr/lib64/libQt5Core.so.5 #5 0x00007ff447929554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #6 0x00007ff447ccbccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 2 (Thread 0x7ff43b2bb700 (LWP 14417)): #0 0x00007ff44792f4dc in futex_wait_cancelable (private=0, expected=0, futex_word=0x7ff44c598f30) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 #1 0x00007ff44792f4dc in __pthread_cond_wait_common (abstime=0x0, mutex=0x561d436a64e0, cond=0x7ff44c598f08) at pthread_cond_wait.c:502 #2 0x00007ff44792f4dc in __pthread_cond_wait (cond=0x7ff44c598f08, mutex=0x561d436a64e0) at pthread_cond_wait.c:655 #3 0x00007ff4483fc87c in std::condition_variable::wait(std::unique_lock<std::mutex>&) () at /usr/lib64/libstdc++.so.6 #4 0x00007ff44baf12d2 in () at /usr/lib64/libQt5WebKit.so.5 #5 0x00007ff44baf13eb in () at /usr/lib64/libQt5WebKit.so.5 #6 0x00007ff4484020bf in () at /usr/lib64/libstdc++.so.6 #7 0x00007ff447929554 in start_thread (arg=<optimized out>) at pthread_create.c:463 #8 0x00007ff447ccbccf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 1 (Thread 0x7ff43ccb2f80 (LWP 14415)): #0 0x00007ff45323a2a8 in g_dbus_object_get_object_path () at /usr/lib64/libgio-2.0.so.0 #1 0x00007ff452f55c1d in cloud_providers_provider_exporter_remove_account () at /usr/lib64/libcloudproviders.so.0 #2 0x0000561d41c90271 in CloudProviderManager::slotFolderListChanged(QMap<QString, OCC::Folder*> const&) (this=0x561d43e38770, folderMap=...) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/src/gui/cloudproviders/cloudprovidermanager.cpp:57 #3 0x00007ff44876b07b in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5 #4 0x0000561d41c98a65 in OCC::FolderMan::folderListChanged(QMap<QString, OCC::Folder*> const&) (this=this@entry=0x561d43b990f0, _t1=...) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/build/src/gui/nextcloud_autogen/EWIEGA46WW/moc_folderman.cpp:286 #5 0x0000561d41bc25b1 in OCC::FolderMan::unloadAndDeleteAllFolders() (this=0x561d43b990f0) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/src/gui/folderman.cpp:143 #6 0x0000561d41ba6ca3 in OCC::Application::slotCleanup() (this=0x7ffdb298a4f0) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/src/gui/application.cpp:308 #7 0x00007ff44876b1d0 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5 #8 0x00007ff448741007 in QCoreApplication::aboutToQuit(QCoreApplication::QPrivateSignal) () at /usr/lib64/libQt5Core.so.5 #9 0x00007ff4487452a9 in QCoreApplicationPrivate::execCleanup() () at /usr/lib64/libQt5Core.so.5 #10 0x00007ff448748c8b in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5 #11 0x0000561d41b916bc in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/nextcloud-client-2.5.1-1.1.x86_64/src/gui/main.cpp:167 Tell me if you need even a better backtrace (I can try to install all missing debuginfo, but this is time consuming) Hope this can help you a bit to find the root cause of this. -- You are 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