https://bugs.kde.org/show_bug.cgi?id=360105
--- Comment #4 from Rex Dieter <rdie...@math.unl.edu> ---
Fwiw, while apparently hung, here's a backtrace ,
While apparently hung, gdb reports:
Thread 3 (Thread 0x7f8118e42700 (LWP 28639)):
#0 0x00007f81316f0fdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007f812f651272 in _xcb_conn_wait (__timeout=-1, __nfds=1,
__fds=0x7f8118e41b80) at /usr/include/bits/poll2.h:46
#2 0x00007f812f651272 in _xcb_conn_wait (c=c@entry=0x5569a8b12b20,
cond=cond@entry=0x5569a8b12b60, vector=vector@entry=0x0, count=count@entry=0x0)
at xcb_conn.c:459
#3 0x00007f812f652ee7 in xcb_wait_for_event (c=0x5569a8b12b20) at xcb_in.c:693
#4 0x00007f811b2a3349 in QXcbEventReader::run() (this=0x5569a8b1d2f0) at
qxcbconnection.cpp:1313
#5 0x00007f813257ae18 in QThreadPrivate::start(void*) (arg=0x5569a8b1d2f0) at
thread/qthread_unix.cpp:340
#6 0x00007f812f43160a in start_thread (arg=0x7f8118e42700) at
pthread_create.c:334
#7 0x00007f81316fca4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 2 (Thread 0x7f8112870700 (LWP 28640)):
#0 0x00007f81316f0fdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007f812eee916c in g_main_context_iterate (priority=2147483647, n_fds=3,
fds=0x7f810c003020, timeout=<optimized out>, context=0x7f810c000990) at
gmain.c:4135
#2 0x00007f812eee916c in g_main_context_iterate
(context=context@entry=0x7f810c000990, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3835
#3 0x00007f812eee927c in g_main_context_iteration (context=0x7f810c000990,
may_block=may_block@entry=1) at gmain.c:3901
#4 0x00007f81327a3cef in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x7f810c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#5 0x00007f813274c6ea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(this=this@entry=0x7f811286fc50, flags=..., flags@entry=...) at
kernel/qeventloop.cpp:204
#6 0x00007f8132576004 in QThread::exec() (this=this@entry=0x7f813550b040
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
thread/qthread.cpp:503
#7 0x00007f8135497445 in QDBusConnectionManager::run() (this=0x7f813550b040
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
qdbusconnection.cpp:181
#8 0x00007f813257ae18 in QThreadPrivate::start(void*) (arg=0x7f813550b040
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
thread/qthread_unix.cpp:340
#9 0x00007f812f43160a in start_thread (arg=0x7f8112870700) at
pthread_create.c:334
#10 0x00007f81316fca4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 1 (Thread 0x7f812274e940 (LWP 28635)):
#0 0x00007f81316f0fdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007f812eee916c in g_main_context_iterate (priority=2147483647, n_fds=2,
fds=0x5569a8f48200, timeout=<optimized out>, context=0x7f81140016f0) at
gmain.c:4135
#2 0x00007f812eee916c in g_main_context_iterate
(context=context@entry=0x7f81140016f0, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3835
#3 0x00007f812eee927c in g_main_context_iteration (context=0x7f81140016f0,
may_block=may_block@entry=1) at gmain.c:3901
#4 0x00007f81327a3cef in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x5569a8b3db60, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#5 0x00007f813274c6ea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(this=this@entry=0x7ffdb31f6a10, flags=..., flags@entry=...) at
kernel/qeventloop.cpp:204
#6 0x00007f8132754ddc in QCoreApplication::exec() () at
kernel/qcoreapplication.cpp:1285
#7 0x00007f8132f950dc in QGuiApplication::exec() () at
kernel/qguiapplication.cpp:1598
#8 0x00007f813357ec35 in QApplication::exec() () at
kernel/qapplication.cpp:2973
#9 0x00007f81350f4871 in kdemain(int, char**) (argc=1, argv=<optimized out>)
at /usr/src/debug/kcalc-15.12.1/kcalc.cpp:2324
#10 0x00007f813161a580 in __libc_start_main (main=
0x5569a768a9a0 <main(int, char**)>, argc=1, argv=0x7ffdb31f6d68,
init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
stack_end=0x7ffdb31f6d58)
at libc-start.c:289
#11 0x00005569a768a9d9 in _start ()
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