Basically the same problem as in bug 1294273 (closed due to EOL) – every now and then plasmashell freezes. My versions: plasma-workspace.x86_64, 5.8.4-1.fc25 libxcb.x86_64, 1.12-1.fc25 xorg-x11-drv-intel.x86_64, 2.99.917-26.20160929.fc25 Backtrace: [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". 0x00007fe23627201d in poll () at ../sysdeps/unix/syscall-template.S:84 84 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS) (gdb) bt #0 0x00007fe23627201d in poll () at ../sysdeps/unix/syscall-template.S:84 #1 0x00007fe23b238d10 in poll (__timeout=-1, __nfds=1, __fds=0x7fffe7113210) at /usr/include/bits/poll2.h:46 #2 _xcb_conn_wait (c=c@entry=0x55e21237e350, cond=cond@entry=0x7fffe7113330, vector=vector@entry=0x0, count=count@entry=0x0) at xcb_conn.c:479 #3 0x00007fe23b23a7cf in wait_for_reply (c=c@entry=0x55e21237e350, request=request@entry=4007, e=e@entry=0x7fffe7113400) at xcb_in.c:516 #4 0x00007fe23b23a941 in xcb_wait_for_reply64 (c=c@entry=0x55e21237e350, request=4007, e=e@entry=0x7fffe7113400) at xcb_in.c:560 #5 0x00007fe23b6a8bd8 in _XReply (dpy=dpy@entry=0x55e21237cfa0, rep=rep@entry=0x7fffe7113480, extra=extra@entry=0, discard=discard@entry=0) at xcb_io.c:596 #6 0x00007fe23441e32a in DRI2GetBuffersWithFormat (dpy=0x55e21237cfa0, drawable=33554525, width=width@entry=0x55e21405f878, height=height@entry=0x55e21405f87c, attachments=0x7fffe7113660, count=1, outCount=0x7fffe7113620) at dri2.c:491 #7 0x00007fe23441e687 in dri2GetBuffersWithFormat (driDrawable=<optimized out>, width=0x55e21405f878, height=0x55e21405f87c, attachments=<optimized out>, count=<optimized out>, out_count=0x7fffe7113620, loaderPrivate=0x55e213e3c6f0) at dri2_glx.c:894 #8 0x00007fe185c75c8d in dri2_drawable_get_buffers (count=<synthetic pointer>, atts=0x55e213fdc0c8, drawable=0x55e2140034f0) at dri2.c:285 #9 dri2_allocate_textures (ctx=0x55e21291abc0, drawable=0x55e2140034f0, statts=0x55e213fdc0c8, statts_count=2) at dri2.c:480 #10 0x00007fe185c70154 in dri_st_framebuffer_validate (stctx=<optimized out>, stfbi=<optimized out>, statts=0x55e213fdc0c8, count=2, out=0x7fffe71137d0) at dri_drawable.c:83 #11 0x00007fe185b05224 in st_framebuffer_validate (stfb=stfb@entry=0x55e213fdbc60, st=st@entry=0x55e212997370) at state_tracker/st_manager.c:202 #12 0x00007fe185b0619c in st_manager_validate_framebuffers (st=st@entry=0x55e212997370) at state_tracker/st_manager.c:870 #13 0x00007fe185abf4fb in st_validate_state (st=st@entry=0x55e212997370, pipeline=pipeline@entry=ST_PIPELINE_RENDER) at state_tracker/st_atom.c:174 #14 0x00007fe185ac8184 in st_Clear (ctx=0x55e212962640, mask=50) at state_tracker/st_cb_clear.c:409 #15 0x00007fe23aaabd9a in QSGBatchRenderer::Renderer::renderBatches (this=this@entry=0x55e213e68bd0) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp:2517 #16 0x00007fe23aab16d5 in QSGBatchRenderer::Renderer::render (this=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp:2741 #17 0x00007fe23aabcfef in QSGRenderer::renderScene (this=0x55e213e68bd0, bindable=...) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/scenegraph/coreapi/qsgrenderer.cpp:223 #18 0x00007fe23aabd6bb in QSGRenderer::renderScene (this=<optimized out>, fboId=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/scenegraph/coreapi/qsgrenderer.cpp:183 #19 0x00007fe23aacd36e in QSGRenderContext::renderNextFrame (this=0x55e2125c3580, renderer=0x55e213e68bd0, fboId=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/scenegraph/qsgcontext.cpp:557 #20 0x00007fe23ab16bce in QQuickWindowPrivate::renderSceneGraph (this=this@entry=0x55e213bd0cb0, size=...) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/items/qquickwindow.cpp:464 #21 0x00007fe23aae3e65 in QSGGuiThreadRenderLoop::renderWindow (this=0x55e2125be7b0, window=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/scenegraph/qsgrenderloop.cpp:397 #22 0x00007fe23ab21676 in QQuickWindow::event (this=this@entry=0x55e21322b700, e=e@entry=0x7fffe7114260) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/items/qquickwindow.cpp:1527 #23 0x00007fe23ca4989b in PlasmaQuick::Dialog::event (this=this@entry=0x55e21322b700, event=event@entry=0x7fffe7114260) at /usr/src/debug/plasma-framework-5.27.0/src/plasmaquick/dialog.cpp:1192 #24 0x00007fe18114d4dd in ToolTipDialog::event (this=0x55e21322b700, e=0x7fffe7114260) at /usr/src/debug/plasma-framework-5.27.0/src/declarativeimports/core/tooltipdialog.cpp:121 #25 0x00007fe2378f6ecc in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x55e21322b700, e=0x7fffe7114260) at kernel/qapplication.cpp:3799 #26 0x00007fe2378fe671 in QApplication::notify (this=0x7fffe7114aa0, receiver=0x55e21322b700, e=0x7fffe7114260) at kernel/qapplication.cpp:3556 #27 0x00007fe23702a7aa in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0x55e21322b700, event=event@entry=0x7fffe7114260) at kernel/qcoreapplication.cpp:988 #28 0x00007fe23736c64e in QCoreApplication::sendEvent (event=0x7fffe7114260, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:231 #29 QWindowPrivate::deliverUpdateRequest (this=this@entry=0x55e213bd0cb0) at kernel/qwindow.cpp:2171 ---Type <return> to continue, or q <return> to quit--- #30 0x00007fe23736cb99 in QWindow::event (this=this@entry=0x55e21322b700, ev=ev@entry=0x7fffe71146e0) at kernel/qwindow.cpp:2142 #31 0x00007fe23ab21615 in QQuickWindow::event (this=this@entry=0x55e21322b700, e=e@entry=0x7fffe71146e0) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/items/qquickwindow.cpp:1546 #32 0x00007fe23ca4989b in PlasmaQuick::Dialog::event (this=this@entry=0x55e21322b700, event=event@entry=0x7fffe71146e0) at /usr/src/debug/plasma-framework-5.27.0/src/plasmaquick/dialog.cpp:1192 #33 0x00007fe18114d4dd in ToolTipDialog::event (this=0x55e21322b700, e=0x7fffe71146e0) at /usr/src/debug/plasma-framework-5.27.0/src/declarativeimports/core/tooltipdialog.cpp:121 #34 0x00007fe2378f6ecc in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x55e21322b700, e=0x7fffe71146e0) at kernel/qapplication.cpp:3799 #35 0x00007fe2378fe671 in QApplication::notify (this=0x7fffe7114aa0, receiver=0x55e21322b700, e=0x7fffe71146e0) at kernel/qapplication.cpp:3556 #36 0x00007fe23702a7aa in QCoreApplication::notifyInternal2 (receiver=0x55e21322b700, event=event@entry=0x7fffe71146e0) at kernel/qcoreapplication.cpp:988 #37 0x00007fe237077d3b in QCoreApplication::sendEvent (event=0x7fffe71146e0, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:231 #38 QTimerInfoList::activateTimers (this=0x55e2123d19e0) at kernel/qtimerinfo_unix.cpp:644 #39 0x00007fe237078291 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:182 #40 0x00007fe22f020e42 in g_main_dispatch (context=0x7fe2180016f0) at gmain.c:3203 #41 g_main_context_dispatch (context=context@entry=0x7fe2180016f0) at gmain.c:3856 #42 0x00007fe22f0211c0 in g_main_context_iterate (context=context@entry=0x7fe2180016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3929 #43 0x00007fe22f02126c in g_main_context_iteration (context=0x7fe2180016f0, may_block=may_block@entry=1) at gmain.c:3990 #44 0x00007fe23707871f in QEventDispatcherGlib::processEvents (this=0x55e2123cb6d0, flags=...) at kernel/qeventdispatcher_glib.cpp:423 #45 0x00007fe23702973a in QEventLoop::exec (this=this@entry=0x7fffe7114930, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212 #46 0x00007fe23703123c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1261 #47 0x000055e2120ad442 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/plasma-workspace-5.8.4/shell/main.cpp:166
backtrace appears at least similar to bug #1399396
*** This bug has been marked as a duplicate of bug 1399396 ***