SUMMARY From time to time (today it happened twice) plasmashell dumps core. When that happens, system panel disappears and then reloads. All other desktop applications continue to work as expected. This started happening with upgrade to Plasma 5.20. STEPS TO REPRODUCE 1. No idea. Happens randomly. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Manjaro testing KDE Plasma Version: 5.20.1 KDE Frameworks Version: 5.75.0 Qt Version: 5.15.1 ``` oct 26 15:29:13 systemd-coredump[1274399]: Process 5378 (plasmashell) of user 1000 dumped core. Stack trace of thread 1274065: #0 0x00007f9201a81615 raise (libc.so.6 + 0x3d615) #1 0x00007f9201a816a0 __restore_rt (libc.so.6 + 0x3d6a0) #2 0x00007f92020a8acb _ZN11QMetaObject8metacallEP7QObjectNS_4CallEiPPv (libQt5Core.so.5 + 0x2bcacb) #3 0x00007f92020d6d72 n/a (libQt5Core.so.5 + 0x2ead72) #4 0x00007f91dd7ffafb n/a (libprocesscore.so.9 + 0x33afb) #5 0x00007f9201ebddc2 n/a (libQt5Core.so.5 + 0xd1dc2) #6 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #7 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #8 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 110461: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f9201ec00d4 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd40d4) #2 0x00007f9203af42fb n/a (libQt5Quick.so.5 + 0x1f52fb) #3 0x00007f9203af689b n/a (libQt5Quick.so.5 + 0x1f789b) #4 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 6504: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f9201ec00d4 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd40d4) #2 0x00007f9203af42fb n/a (libQt5Quick.so.5 + 0x1f52fb) #3 0x00007f9203af689b n/a (libQt5Quick.so.5 + 0x1f789b) #4 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 1274064: #0 0x00007f9200f4f9c8 pthread_cond_timedwait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf9c8) #1 0x00007f9201ec0058 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd4058) #2 0x00007f9201ebdfc4 n/a (libQt5Core.so.5 + 0xd1fc4) #3 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #4 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #5 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 6290: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f9201ec00d4 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd40d4) #2 0x00007f9203af42fb n/a (libQt5Quick.so.5 + 0x1f52fb) #3 0x00007f9203af689b n/a (libQt5Quick.so.5 + 0x1f789b) #4 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5384: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f91f4fab13c n/a (iris_dri.so + 0x4d413c) #2 0x00007f91f4fab038 n/a (iris_dri.so + 0x4d4038) #3 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #4 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5385: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f91f4fab13c n/a (iris_dri.so + 0x4d413c) #2 0x00007f91f4fab038 n/a (iris_dri.so + 0x4d4038) #3 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #4 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 206718: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f91dd686674 n/a (libpulse.so.0 + 0x33674) #2 0x00007f91dd66f9a9 pa_mainloop_poll (libpulse.so.0 + 0x1c9a9) #3 0x00007f91dd67a2a1 pa_mainloop_iterate (libpulse.so.0 + 0x272a1) #4 0x00007f91dd67a351 pa_mainloop_run (libpulse.so.0 + 0x27351) #5 0x00007f91dd68a81e n/a (libpulse.so.0 + 0x3781e) #6 0x00007f91dd4105fc n/a (libpulsecommon-13.99.so + 0x565fc) #7 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #8 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5383: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f920056a75f n/a (libglib-2.0.so.0 + 0xa675f) #2 0x00007f9200515121 g_main_context_iteration (libglib-2.0.so.0 + 0x51121) #3 0x00007f92020f8941 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x30c941) #4 0x00007f920209e65c _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2b265c) #5 0x00007f9201eb8ca2 _ZN7QThread4execEv (libQt5Core.so.5 + 0xccca2) #6 0x00007f920369e4b9 n/a (libQt5Qml.so.5 + 0x30c4b9) #7 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #8 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #9 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5381: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f9203f6d63b n/a (libxcb.so.1 + 0xc63b) #2 0x00007f9203f6f37b xcb_wait_for_event (libxcb.so.1 + 0xe37b) #3 0x00007f91fd734f61 n/a (libQt5XcbQpa.so.5 + 0x5df61) #4 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5386: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f91f4fab13c n/a (iris_dri.so + 0x4d413c) #2 0x00007f91f4fab038 n/a (iris_dri.so + 0x4d4038) #3 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #4 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5389: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f9201ec00d4 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd40d4) #2 0x00007f9203af42fb n/a (libQt5Quick.so.5 + 0x1f52fb) #3 0x00007f9203af689b n/a (libQt5Quick.so.5 + 0x1f789b) #4 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 6931: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f920056a75f n/a (libglib-2.0.so.0 + 0xa675f) #2 0x00007f9200515e63 g_main_loop_run (libglib-2.0.so.0 + 0x51e63) #3 0x00007f91dd540fe8 n/a (libgio-2.0.so.0 + 0x101fe8) #4 0x00007f9200543ce1 n/a (libglib-2.0.so.0 + 0x7fce1) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5390: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f920056a75f n/a (libglib-2.0.so.0 + 0xa675f) #2 0x00007f9200515121 g_main_context_iteration (libglib-2.0.so.0 + 0x51121) #3 0x00007f92020f8941 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x30c941) #4 0x00007f920209e65c _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2b265c) #5 0x00007f9201eb8ca2 _ZN7QThread4execEv (libQt5Core.so.5 + 0xccca2) #6 0x00007f9203a451db n/a (libQt5Quick.so.5 + 0x1461db) #7 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #8 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #9 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 415113: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f9201ec00d4 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd40d4) #2 0x00007f9203af42fb n/a (libQt5Quick.so.5 + 0x1f52fb) #3 0x00007f9203af689b n/a (libQt5Quick.so.5 + 0x1f789b) #4 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5387: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f91f4fab13c n/a (iris_dri.so + 0x4d413c) #2 0x00007f91f4fab038 n/a (iris_dri.so + 0x4d4038) #3 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #4 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5378: #0 0x00007f9201b34f9f write (libc.so.6 + 0xf0f9f) #1 0x00007f92005623eb n/a (libglib-2.0.so.0 + 0x9e3eb) #2 0x00007f92005128d0 n/a (libglib-2.0.so.0 + 0x4e8d0) #3 0x00007f9200516ab8 g_main_context_dispatch (libglib-2.0.so.0 + 0x52ab8) #4 0x00007f920056a7d1 n/a (libglib-2.0.so.0 + 0xa67d1) #5 0x00007f9200515121 g_main_context_iteration (libglib-2.0.so.0 + 0x51121) #6 0x00007f92020f8941 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x30c941) #7 0x00007f920209e65c _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2b265c) #8 0x00007f92020a6af4 _ZN16QCoreApplication4execEv (libQt5Core.so.5 + 0x2baaf4) #9 0x0000560ed0ff4f99 n/a (plasmashell + 0x1df99) #10 0x00007f9201a6c152 __libc_start_main (libc.so.6 + 0x28152) #11 0x0000560ed0ff51de n/a (plasmashell + 0x1e1de) Stack trace of thread 6930: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f920056a75f n/a (libglib-2.0.so.0 + 0xa675f) #2 0x00007f9200515121 g_main_context_iteration (libglib-2.0.so.0 + 0x51121) #3 0x00007f916ce3dc0e n/a (libdconfsettings.so + 0x5c0e) #4 0x00007f9200543ce1 n/a (libglib-2.0.so.0 + 0x7fce1) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 206719: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f9201ec00d4 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd40d4) #2 0x00007f9203af42fb n/a (libQt5Quick.so.5 + 0x1f52fb) #3 0x00007f9203af689b n/a (libQt5Quick.so.5 + 0x1f789b) #4 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5628: #0 0x00007f9200f4f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2) #1 0x00007f9201ec00d4 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd40d4) #2 0x00007f9203af42fb n/a (libQt5Quick.so.5 + 0x1f52fb) #3 0x00007f9203af689b n/a (libQt5Quick.so.5 + 0x1f789b) #4 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 6929: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f920056a75f n/a (libglib-2.0.so.0 + 0xa675f) #2 0x00007f9200515121 g_main_context_iteration (libglib-2.0.so.0 + 0x51121) #3 0x00007f9200515172 n/a (libglib-2.0.so.0 + 0x51172) #4 0x00007f9200543ce1 n/a (libglib-2.0.so.0 + 0x7fce1) #5 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #6 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5391: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f920056a75f n/a (libglib-2.0.so.0 + 0xa675f) #2 0x00007f9200515121 g_main_context_iteration (libglib-2.0.so.0 + 0x51121) #3 0x00007f92020f8941 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x30c941) #4 0x00007f920209e65c _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2b265c) #5 0x00007f9201eb8ca2 _ZN7QThread4execEv (libQt5Core.so.5 + 0xccca2) #6 0x00007f91dca1083a n/a (libqmlxmllistmodelplugin.so + 0xb83a) #7 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #8 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #9 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5402: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f920056a75f n/a (libglib-2.0.so.0 + 0xa675f) #2 0x00007f9200515121 g_main_context_iteration (libglib-2.0.so.0 + 0x51121) #3 0x00007f92020f8941 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x30c941) #4 0x00007f920209e65c _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2b265c) #5 0x00007f9201eb8ca2 _ZN7QThread4execEv (libQt5Core.so.5 + 0xccca2) #6 0x00007f91cc099bab _ZN15KCupsConnection3runEv (libkcupslib.so + 0x20bab) #7 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #8 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #9 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5392: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f920056a75f n/a (libglib-2.0.so.0 + 0xa675f) #2 0x00007f9200515121 g_main_context_iteration (libglib-2.0.so.0 + 0x51121) #3 0x00007f92020f8941 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x30c941) #4 0x00007f920209e65c _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2b265c) #5 0x00007f9201eb8ca2 _ZN7QThread4execEv (libQt5Core.so.5 + 0xccca2) #6 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #7 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #8 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) Stack trace of thread 5382: #0 0x00007f9201b3946f __poll (libc.so.6 + 0xf546f) #1 0x00007f920056a75f n/a (libglib-2.0.so.0 + 0xa675f) #2 0x00007f9200515121 g_main_context_iteration (libglib-2.0.so.0 + 0x51121) #3 0x00007f92020f8941 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x30c941) #4 0x00007f920209e65c _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2b265c) #5 0x00007f9201eb8ca2 _ZN7QThread4execEv (libQt5Core.so.5 + 0xccca2) #6 0x00007f9202a22098 n/a (libQt5DBus.so.5 + 0x17098) #7 0x00007f9201eb9e8f n/a (libQt5Core.so.5 + 0xcde8f) #8 0x00007f9200f493e9 start_thread (libpthread.so.0 + 0x93e9) #9 0x00007f9201b44293 __clone (libc.so.6 + 0x100293) ```
Hmm, can't tell which thread is crashing, and we're also missing debug symbols. If you can still reproduce this crash, can you install debug symbols and generate a backtrace of only the crashing thread (or at least specify which thread is crashing)? Instructions are here: https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports Thanks
Unfortunately (or rather fortunately :) ) I'm unable to reproduce this since I upgraded to 5.21 and enabled systemd startup.
Cool, thanks.