Happening every time for me on krillin and mako rc-proposed r514 on mako rc-proposed r413 on krillin Here is stack trace Core was generated by `unity8 --mode=full-greeter'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0xb6b08886 in QQmlBoundSignalExpression::function() const () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5 (gdb) t a a bt Thread 35 (Thread 0x9c4b0410 (LWP 3455)): #0 0xb43a89cc in ?? () #1 0xb43b4ef6 in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 34 (Thread 0x9efd5410 (LWP 21018)): #0 0xb6078d46 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 #1 0xb607493a in pthread_cond_timedwait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0 #2 0xb62cc0cc in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #3 0xb62c9550 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #4 0xb62cb4c6 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #5 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #6 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 33 (Thread 0x96ced410 (LWP 4108)): #0 0xb6110620 in syscall () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5c06110 in g_cond_wait () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 #2 0xb5bb6524 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 32 (Thread 0x9e7d5410 (LWP 21019)): #0 0xb6078d46 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 #1 0xb607493a in pthread_cond_timedwait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0 #2 0xb62cc0cc in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #3 0xb62c9550 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #4 0xb62cb4c6 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #5 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #6 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 ---Type to continue, or q to quit--- Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 31 (Thread 0xa282e410 (LWP 4107)): #0 0xb6110620 in syscall () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5c06110 in g_cond_wait () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 #2 0xb5bb6524 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 30 (Thread 0x9f7d5410 (LWP 4106)): #0 0xb6110620 in syscall () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5c06110 in g_cond_wait () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 #2 0xb5bb6524 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 29 (Thread 0x9ffd5410 (LWP 4105)): #0 0xb6110620 in syscall () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5c06110 in g_cond_wait () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 #2 0xb5bb6524 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 28 (Thread 0xacdfd410 (LWP 2940)): #0 0xb6113132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb3def434 in ?? () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.41 #2 0xb3dfb79e in ?? () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.41 #3 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #4 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #5 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 27 (Thread 0x9a656410 (LWP 3743)): #0 0xb6113132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xac5e099e in ?? () from /usr/lib/arm-linux-gnueabihf/libdbus-cpp.so.4 #2 0xac5e2976 in ?? () from /usr/lib/arm-linux-gnueabihf/libdbus-cpp.so.4 #3 0xac5e2ed6 in ?? () from /usr/lib/arm-linux-gnueabihf/libdbus-cpp.so.4 ---Type to continue, or q to quit--- #4 0xac5ca770 in core::dbus::Bus::run() () from /usr/lib/arm-linux-gnueabihf/libdbus-cpp.so.4 #5 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #6 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #7 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 26 (Thread 0x9ae56410 (LWP 3396)): #0 0xb610e3e2 in select () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0x00000000 in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 25 (Thread 0x9d7d5410 (LWP 3350)): #0 0xb6078d44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 #1 0xb60746b0 in pthread_cond_wait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0 #2 0xa7c5b5e2 in ?? () from /usr/lib/arm-linux-gnueabihf/libbiometry.so.0 #3 0xa7c59c36 in ?? () from /usr/lib/arm-linux-gnueabihf/libbiometry.so.0 #4 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #5 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #6 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 24 (Thread 0x93972410 (LWP 21020)): #0 0xb6078d46 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 #1 0xb607493a in pthread_cond_timedwait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0 #2 0xb62cc0cc in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #3 0xb62c9550 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #4 0xb62cb4c6 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #5 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #6 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 23 (Thread 0x9dfd5410 (LWP 3349)): ---Type to continue, or q to quit--- #0 0xb6113132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xa7c5acc8 in ?? () from /usr/lib/arm-linux-gnueabihf/libbiometry.so.0 #2 0xa7c5b4e0 in ?? () from /usr/lib/arm-linux-gnueabihf/libbiometry.so.0 #3 0xa7c59c36 in ?? () from /usr/lib/arm-linux-gnueabihf/libbiometry.so.0 #4 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #5 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #6 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 22 (Thread 0xa41fd410 (LWP 3125)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5bd60d8 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 21 (Thread 0xa4a2a410 (LWP 3122)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5bd60d8 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 20 (Thread 0xa309d410 (LWP 3270)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5bd60d8 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 19 (Thread 0xa522a410 (LWP 3121)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5bd60d8 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 18 (Thread 0xa61b6410 (LWP 3120)): #0 0xb6078d44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 #1 0xb60746b0 in pthread_cond_wait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0 #2 0xac5e29da in ?? () from /usr/lib/arm-linux-gnueabihf/libdbus-cpp.so.4 #3 0xac5e2ed6 in ?? () from /usr/lib/arm-linux-gnueabihf/libdbus-cpp.so.4 ---Type to continue, or q to quit--- #4 0xac5ca770 in core::dbus::Bus::run() () from /usr/lib/arm-linux-gnueabihf/libdbus-cpp.so.4 #5 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #6 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #7 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 17 (Thread 0xa7189410 (LWP 3065)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5bd60d8 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 16 (Thread 0xab00c410 (LWP 2981)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5bd60d8 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 15 (Thread 0xab80c410 (LWP 2975)): #0 0xb43a9b7c in ?? () #1 0xb430f6fe in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 14 (Thread 0x94972410 (LWP 21038)): #0 0xb6110622 in syscall () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5c0621c in g_cond_wait_until () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 #2 0xb5bb64e6 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 13 (Thread 0xad5fd410 (LWP 2939)): #0 0xb6113132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb3def434 in ?? () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.41 #2 0xb3dfb79e in ?? () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.41 #3 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #4 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #5 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 ---Type to continue, or q to quit--- Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 12 (Thread 0xaddfd410 (LWP 2929)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb3b4c9ca in ?? () from /usr/lib/arm-linux-gnueabihf/libmircommon.so.6 #2 0xb3b4fd72 in ?? () from /usr/lib/arm-linux-gnueabihf/libmircommon.so.6 #3 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #4 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #5 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 11 (Thread 0xae9b2410 (LWP 2927)): #0 0xb6078d44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 #1 0xb60746b0 in pthread_cond_wait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0 #2 0xb621b6e4 in std::condition_variable::wait(std::unique_lock&) () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #3 0xb3d97d40 in ?? () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.41 #4 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #5 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #6 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 10 (Thread 0xa183a410 (LWP 3343)): #0 0xb6dd27f0 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Gui.so.5 #1 0x0000006a in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 9 (Thread 0xaf3bb410 (LWP 2926)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb3b4c9ca in ?? () from /usr/lib/arm-linux-gnueabihf/libmircommon.so.6 #2 0xb3b4fd72 in ?? () from /usr/lib/arm-linux-gnueabihf/libmircommon.so.6 #3 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #4 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #5 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 ---Type to continue, or q to quit--- Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 8 (Thread 0xafbbb410 (LWP 2925)): #0 0xb6078d44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 #1 0xb60746b0 in pthread_cond_wait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0 #2 0xb2507b62 in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 7 (Thread 0xb1afd410 (LWP 2924)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb3b4c9ca in ?? () from /usr/lib/arm-linux-gnueabihf/libmircommon.so.6 #2 0xb3b4fd72 in ?? () from /usr/lib/arm-linux-gnueabihf/libmircommon.so.6 #3 0xb621e2a0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 #4 0xb6070490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0 #5 0xb6112c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 6 (Thread 0x94172410 (LWP 20509)): #0 0xb6078d44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 #1 0xb60746b0 in pthread_cond_wait@@GLIBC_2.4 () from /lib/arm-linux-gnueabihf/libpthread.so.0 #2 0xb62cc138 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #3 0xb62c3b2e in QFutureInterfaceBase::waitForResult(int) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #4 0xa34a3daa in ?? () from /usr/lib/arm-linux-gnueabihf/unity8/qml/LightDM/IntegratedLightDM/libIntegratedLightDM-qml.so #5 0xa3456160 in pam_vprompt () from /lib/arm-linux-gnueabihf/libpam.so.0 #6 0xa3456278 in pam_prompt () from /lib/arm-linux-gnueabihf/libpam.so.0 #7 0x9c7cc5bc in ?? () from /lib/arm-linux-gnueabihf/security/pam_extrausers.so Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 5 (Thread 0xb23fd410 (LWP 2920)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 ---Type to continue, or q to quit--- #1 0xb5bd60d8 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 4 (Thread 0x9b656410 (LWP 3395)): #0 0xb610c4e2 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb5bd60d8 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 3 (Thread 0xb2f77410 (LWP 2917)): #0 0xb6110620 in syscall () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb3c515c6 in ?? () from /usr/lib/arm-linux-gnueabihf/liblttng-ust.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 2 (Thread 0xb3777410 (LWP 2916)): #0 0xb6110620 in syscall () from /lib/arm-linux-gnueabihf/libc.so.6 #1 0xb3c515c6 in ?? () from /usr/lib/arm-linux-gnueabihf/liblttng-ust.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 1 (Thread 0xb6f5d000 (LWP 2898)): #0 0xb6b08886 in QQmlBoundSignalExpression::function() const () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5 #1 0xb6b0890a in QQmlBoundSignalExpression::sourceLocation() const () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5 #2 0xb6af1e8e in QQmlData::destroyed(QObject*) () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5 #3 0xb645421c in QObject::~QObject() () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 #4 0xb682f53a in QQuickItem::~QQuickItem() () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5 #5 0xb683f904 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5 Backtrace stopped: previous frame identical to this frame (corrupt stack?) (gdb) (gdb)