https://bugs.kde.org/show_bug.cgi?id=360105
--- Comment #5 from Rex Dieter <rdie...@math.unl.edu> ---
hrm, to rule out glib event loop, here's when running with QT_NO_GLIB=1
Thread 3 (Thread 0x7fd75967f700 (LWP 28730)):
#0 0x00007fd771f31fdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007fd76fe92272 in _xcb_conn_wait (__timeout=-1, __nfds=1,
__fds=0x7fd75967eb80) at /usr/include/bits/poll2.h:46
#2 0x00007fd76fe92272 in _xcb_conn_wait (c=c@entry=0x563176076b20,
cond=cond@entry=0x563176076b60, vector=vector@entry=0x0, count=count@entry=0x0)
at xcb_conn.c:459
#3 0x00007fd76fe93ee7 in xcb_wait_for_event (c=0x563176076b20) at xcb_in.c:693
#4 0x00007fd75bae0349 in QXcbEventReader::run() (this=0x5631760812f0) at
qxcbconnection.cpp:1313
#5 0x00007fd772dbbe18 in QThreadPrivate::start(void*) (arg=0x5631760812f0) at
thread/qthread_unix.cpp:340
#6 0x00007fd76fc7260a in start_thread (arg=0x7fd75967f700) at
pthread_create.c:334
#7 0x00007fd771f3da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 2 (Thread 0x7fd75320c700 (LWP 28731)):
#0 0x00007fd771f33d63 in select () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007fd772fe055f in qt_safe_select(int, fd_set*, fd_set*, fd_set*,
timespec const*) (nfds=10, fdread=fdread@entry=0x7fd74c000a78,
fdwrite=fdwrite@entry=0x7fd74c000d08, fdexcept=fdexcept@entry=0x7fd74c000f98,
orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2 0x00007fd772fe1f9e in
QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>,
timespec*) (timeout=0x0, exceptfds=0x7fd74c000f98, writefds=0x7fd74c000d08,
readfds=0x7fd74c000a78, nfds=<optimized out>, this=0x7fd74c0008c0) at
kernel/qeventdispatcher_unix.cpp:320
#3 0x00007fd772fe1f9e in
QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>,
timespec*) (this=this@entry=0x7fd74c0008e0, flags=...,
flags@entry=..., timeout=timeout@entry=0x0) at
kernel/qeventdispatcher_unix.cpp:196
#4 0x00007fd772fe24b2 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x7fd74c0008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5 0x00007fd772f8d6ea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(this=this@entry=0x7fd75320bc50, flags=..., flags@entry=...) at
kernel/qeventloop.cpp:204
#6 0x00007fd772db7004 in QThread::exec() (this=this@entry=0x7fd775d48040
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
thread/qthread.cpp:503
#7 0x00007fd775cd4445 in QDBusConnectionManager::run() (this=0x7fd775d48040
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
qdbusconnection.cpp:181
#8 0x00007fd772dbbe18 in QThreadPrivate::start(void*) (arg=0x7fd775d48040
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
thread/qthread_unix.cpp:340
#9 0x00007fd76fc7260a in start_thread (arg=0x7fd75320c700) at
pthread_create.c:334
#10 0x00007fd771f3da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 1 (Thread 0x7fd762f8b940 (LWP 28726)):
#0 0x00007fd771f33d63 in select () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007fd772fe055f in qt_safe_select(int, fd_set*, fd_set*, fd_set*,
timespec const*) (nfds=7, fdread=fdread@entry=0x5631760bc988,
fdwrite=fdwrite@entry=0x5631760bcc18, fdexcept=fdexcept@entry=0x5631760bcea8,
orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2 0x00007fd772fe1f9e in
QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>,
timespec*) (timeout=0x0, exceptfds=0x5631760bcea8, writefds=0x5631760bcc18,
readfds=0x5631760bc988, nfds=<optimized out>, this=0x5631760af5b0) at
kernel/qeventdispatcher_unix.cpp:320
#3 0x00007fd772fe1f9e in
QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>,
timespec*) (this=this@entry=0x5631760bc7f0, flags=...,
flags@entry=..., timeout=timeout@entry=0x0) at
kernel/qeventdispatcher_unix.cpp:196
#4 0x00007fd772fe24b2 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x5631760af5b0, flags=flags@entry=...)
at kernel/qeventdispatcher_unix.cpp:607
#5 0x00007fd75bb5260d in
QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=<optimized out>, flags=...)
at eventdispatchers/qunixeventdispatcher.cpp:62
#6 0x00007fd772f8d6ea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(this=this@entry=0x7ffc58ff92f0, flags=..., flags@entry=...) at
kernel/qeventloop.cpp:204
#7 0x00007fd772f95ddc in QCoreApplication::exec() () at
kernel/qcoreapplication.cpp:1285
---Type <return> to continue, or q <return> to quit---
#8 0x00007fd7737d60dc in QGuiApplication::exec() () at
kernel/qguiapplication.cpp:1598
#9 0x00007fd773dbfc35 in QApplication::exec() () at
kernel/qapplication.cpp:2973
#10 0x00007fd775935871 in kdemain(int, char**) (argc=1, argv=<optimized out>)
at /usr/src/debug/kcalc-15.12.1/kcalc.cpp:2324
#11 0x00007fd771e5b580 in __libc_start_main (main=
0x56317486b9a0 <main(int, char**)>, argc=1, argv=0x7ffc58ff9648,
init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
stack_end=0x7ffc58ff9638)
at libc-start.c:289
#12 0x000056317486b9d9 in _start ()
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