[Octave-bug-tracker] [bug #54507] Segfault in QT5 when resizing window during initialization

[John W. Eaton]

Follow-up Comment #3, bug #54507 (project octave):

Posted to the mailing list:

The crash doesn't occur on each execution.  I can get the
segfault in 1 out of every 5 or so executions.  It seems to
be related to how fast I can grab the window to resize/move
it.  I haven't noticed whether the command prompt is present
when I do the grabbing, but it is present as octave dumps
core.

Someone else has reported the bug on FreeBSD, and my FreeBSD bug
report is here:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230072 

I'm not convinced it an octave problem, but I don't know
C++ so cannot delve into Qt5 with much success.  It alsoi
could be a FreeBSD pthread problem.

If you need me to recompile a support library with debug
symbols, just ask.


Thread 10 (LWP 100930):
#0  _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
#1  0x00000002041da3e1 in _thr_umtx_timedwait_uint (mtx=0x20d1500c8,
id=<optimized out>, 
    clockid=<optimized out>, abstime=<optimized out>, shared=<optimized out>)
    at /usr/src/lib/libthr/thread/thr_umtx.c:236
#2  0x00000002041e4038 in cond_wait_user (abstime=0x0, cancel=1,
cvp=<optimized out>, mp=<optimized out>)
    at /usr/src/lib/libthr/thread/thr_cond.c:306
#3  cond_wait_common (cond=<optimized out>, mutex=<optimized out>,
abstime=0x0, cancel=1)
    at /usr/src/lib/libthr/thread/thr_cond.c:366
#4  0x0000000214bb41ed in ?? () from /usr/local/lib/dri/r600_dri.so
#5  0x0000000214bb4849 in ?? () from /usr/local/lib/dri/r600_dri.so
#6  0x00000002041d8426 in thread_start (curthread=0x211146100)
    at /usr/src/lib/libthr/thread/thr_create.c:291
#7  0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffbeff6000
warning: Unexpected size of section `.reg-xstate/100905' in core file.

Thread 9 (LWP 100905):
#0  _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
#1  0x00000002041da3e1 in _thr_umtx_timedwait_uint (mtx=0x20d150098,
id=<optimized out>, 
    clockid=<optimized out>, abstime=<optimized out>, shared=<optimized out>)
    at /usr/src/lib/libthr/thread/thr_umtx.c:236
#2  0x00000002041e4038 in cond_wait_user (abstime=0x0, cancel=1,
cvp=<optimized out>, mp=<optimized out>)
    at /usr/src/lib/libthr/thread/thr_cond.c:306
#3  cond_wait_common (cond=<optimized out>, mutex=<optimized out>,
abstime=0x0, cancel=1)
    at /usr/src/lib/libthr/thread/thr_cond.c:366
#4  0x0000000214bb41ed in ?? () from /usr/local/lib/dri/r600_dri.so
#5  0x0000000214bb4849 in ?? () from /usr/local/lib/dri/r600_dri.so
#6  0x00000002041d8426 in thread_start (curthread=0x211145200)
    at /usr/src/lib/libthr/thread/thr_create.c:291
#7  0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffbf3f8000
warning: Unexpected size of section `.reg-xstate/100904' in core file.

Thread 8 (LWP 100904):
#0  _sigwait () at _sigwait.S:3
#1  0x00000002041ddf91 in __thr_sigwait (set=0x20346cea4
<octave_async_signals.sigmask>, 
    sig=0x7fffbf5f8f94) at /usr/src/lib/libthr/thread/thr_sig.c:726
#2  0x0000000202ffaa39 in signal_watcher () from
/usr/local/lib/octave/4.4.1/liboctave.so.6
#3  0x00000002041d8426 in thread_start (curthread=0x211145700)
    at /usr/src/lib/libthr/thread/thr_create.c:291
#4  0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffbf5f9000
warning: Unexpected size of section `.reg-xstate/100891' in core file.

Thread 7 (LWP 100891):
#0  _select () at _select.S:3
#1  0x00000002041db1d2 in __thr_select (numfds=1, readfds=0x7fffbf7f8f00,
writefds=0x0, 
    exceptfds=0x7fffbf7f8f80, timeout=0x7fffbf7f9008) at
/usr/src/lib/libthr/thread/thr_syscalls.c:495
#2  0x00000002081c607d in rl_read_key () from /usr/local/lib/libreadline.so.7
#3  0x00000002081aac8b in readline_internal_char () from
/usr/local/lib/libreadline.so.7
#4  0x00000002081aa5e5 in readline () from /usr/local/lib/libreadline.so.7
#5  0x0000000202fb5384 in
octave::gnu_readline::do_readline(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool&) ()
from /usr/local/lib/octave/4.4.1/liboctave.so.6
#6  0x0000000202fb7052 in
octave::command_editor::readline(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool&) ()
from /usr/local/lib/octave/4.4.1/liboctave.so.6
#7  0x0000000201947327 in interactive_input(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool&) ()
from /usr/local/lib/octave/4.4.1/liboctinterp.so.6
#8  0x0000000201946ebb in octave::base_reader::octave_gets(bool&) ()
   from /usr/local/lib/octave/4.4.1/liboctinterp.so.6
#9  0x000000020194889d in octave::terminal_reader::get_input(bool&) ()
   from /usr/local/lib/octave/4.4.1/liboctinterp.so.6
#10 0x00000002015da1e3 in octave::lexer::fill_flex_buffer(char*, unsigned int)
()
   from /usr/local/lib/octave/4.4.1/liboctinterp.so.6
#11 0x00000002015d5419 in yy_get_next_buffer(void*) () from
/usr/local/lib/octave/4.4.1/liboctinterp.so.6
#12 0x00000002015c9df2 in octave_lex(OCTAVE_STYPE*, void*) ()
   from /usr/local/lib/octave/4.4.1/liboctinterp.so.6
#13 0x00000002015de8a7 in octave_pull_parse(octave_pstate*,
octave::base_parser&) ()
   from /usr/local/lib/octave/4.4.1/liboctinterp.so.6
#14 0x00000002015ec96d in octave::parser::run() () from
/usr/local/lib/octave/4.4.1/liboctinterp.so.6
#15 0x00000002019558d5 in octave::interpreter::main_loop() ()
   from /usr/local/lib/octave/4.4.1/liboctinterp.so.6
#16 0x000000020195478f in octave::interpreter::execute() ()
   from /usr/local/lib/octave/4.4.1/liboctinterp.so.6
#17 0x00000002009436c2 in octave::octave_interpreter::execute() ()
   from /usr/local/lib/octave/4.4.1/liboctgui.so.4
#18 0x0000000204644fb1 in QObject::event(QEvent*) () from
/usr/local/lib/qt5/libQt5Core.so.5
#19 0x0000000203879151 in QApplicationPrivate::notify_helper(QObject*,
QEvent*) ()
   from /usr/local/lib/qt5/libQt5Widgets.so.5
#20 0x000000020387a441 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/local/lib/qt5/libQt5Widgets.so.5
#21 0x000000020461af91 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
()
   from /usr/local/lib/qt5/libQt5Core.so.5
#22 0x000000020461be59 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) ()
   from /usr/local/lib/qt5/libQt5Core.so.5
#23 0x000000020466dd88 in ?? () from /usr/local/lib/qt5/libQt5Core.so.5
#24 0x0000000208747ea7 in g_main_context_dispatch () from
/usr/local/lib/libglib-2.0.so.0
#25 0x0000000208748234 in ?? () from /usr/local/lib/libglib-2.0.so.0
#26 0x00000002087482e4 in g_main_context_iteration () from
/usr/local/lib/libglib-2.0.so.0
#27 0x000000020466d806 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/local/lib/qt5/libQt5Core.so.5
#28 0x0000000204616a8e in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/local/lib/qt5/libQt5Core.so.5
#29 0x0000000204453aec in QThread::exec() () from
/usr/local/lib/qt5/libQt5Core.so.5
#30 0x0000000204457a2a in ?? () from /usr/local/lib/qt5/libQt5Core.so.5
#31 0x00000002041d8426 in thread_start (curthread=0x211144d00)
    at /usr/src/lib/libthr/thread/thr_create.c:291
#32 0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffbf7fa000
warning: Unexpected size of section `.reg-xstate/100825' in core file.

Thread 6 (LWP 100825):
#0  _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
#1  0x00000002041da3e1 in _thr_umtx_timedwait_uint (mtx=0x20d150050,
id=<optimized out>, 
    clockid=<optimized out>, abstime=<optimized out>, shared=<optimized out>)
    at /usr/src/lib/libthr/thread/thr_umtx.c:236
#2  0x00000002041e4038 in cond_wait_user (abstime=0x0, cancel=1,
cvp=<optimized out>, mp=<optimized out>)
    at /usr/src/lib/libthr/thread/thr_cond.c:306
#3  cond_wait_common (cond=<optimized out>, mutex=<optimized out>,
abstime=0x0, cancel=1)
    at /usr/src/lib/libthr/thread/thr_cond.c:366
#4  0x0000000204458e5b in ?? () from /usr/local/lib/qt5/libQt5Core.so.5
#5  0x0000000204458c24 in QWaitCondition::wait(QMutex*, unsigned long) ()
   from /usr/local/lib/qt5/libQt5Core.so.5
#6  0x0000000203a848d2 in ?? () from /usr/local/lib/qt5/libQt5Widgets.so.5
#7  0x0000000204457a2a in ?? () from /usr/local/lib/qt5/libQt5Core.so.5
#8  0x00000002041d8426 in thread_start (curthread=0x211143400)
    at /usr/src/lib/libthr/thread/thr_create.c:291
#9  0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffbf9fb000
warning: Unexpected size of section `.reg-xstate/100824' in core file.

Thread 5 (LWP 100824):
#0  _nanosleep () at _nanosleep.S:3
#1  0x00000002041dae2c in __thr_nanosleep (time_to_sleep=0x7fffbfbfaee8,
time_remaining=0x7fffbfbfaee8)
    at /usr/src/lib/libthr/thread/thr_syscalls.c:289
#2  0x000000020466cf0b in ?? () from /usr/local/lib/qt5/libQt5Core.so.5
#3  0x00000002008f3272 in SelfListener::run() () from
/usr/local/lib/octave/4.4.1/liboctgui.so.4
#4  0x0000000204457a2a in ?? () from /usr/local/lib/qt5/libQt5Core.so.5
#5  0x00000002041d8426 in thread_start (curthread=0x210c29700)
    at /usr/src/lib/libthr/thread/thr_create.c:291
#6  0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffbfbfc000
warning: Unexpected size of section `.reg-xstate/100822' in core file.

Thread 4 (LWP 100822):
#0  _poll () at _poll.S:3
#1  0x00000002041daf46 in __thr_poll (fds=0x211278008, nfds=1, timeout=-1)
    at /usr/src/lib/libthr/thread/thr_syscalls.c:338
#2  0x00000002087481d7 in ?? () from /usr/local/lib/libglib-2.0.so.0
#3  0x00000002087482e4 in g_main_context_iteration () from
/usr/local/lib/libglib-2.0.so.0
#4  0x000000020466d806 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/local/lib/qt5/libQt5Core.so.5
#5  0x0000000204616a8e in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/local/lib/qt5/libQt5Core.so.5
#6  0x0000000204453aec in QThread::exec() () from
/usr/local/lib/qt5/libQt5Core.so.5
#7  0x000000020d17c9c3 in ?? () from /usr/local/lib/qt5/libQt5DBus.so.5
#8  0x0000000204457a2a in ?? () from /usr/local/lib/qt5/libQt5Core.so.5
#9  0x00000002041d8426 in thread_start (curthread=0x210c27900)
    at /usr/src/lib/libthr/thread/thr_create.c:291
#10 0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffbfdfd000
warning: Unexpected size of section `.reg-xstate/100310' in core file.

Thread 3 (LWP 100310):
#0  _poll () at _poll.S:3
#1  0x00000002041daf46 in __thr_poll (fds=0x7fffbfffde38, nfds=1, timeout=-1)
    at /usr/src/lib/libthr/thread/thr_syscalls.c:338
#2  0x000000020bfa0e32 in ?? () from /usr/local/lib/libxcb.so.1
#3  0x000000020bfa2ffb in xcb_wait_for_event () from
/usr/local/lib/libxcb.so.1
#4  0x000000020f22f3e5 in ?? () from /usr/local/lib/qt5/libQt5XcbQpa.so.5
#5  0x0000000204457a2a in ?? () from /usr/local/lib/qt5/libQt5Core.so.5
#6  0x00000002041d8426 in thread_start (curthread=0x210c26000)
    at /usr/src/lib/libthr/thread/thr_create.c:291
#7  0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffbfffe000
warning: Unexpected size of section `.reg-xstate/100653' in core file.

Thread 2 (LWP 100653):
#0  _poll () at _poll.S:3
#1  0x00000002041daf46 in __thr_poll (fds=0x212b88a00, nfds=2, timeout=10)
    at /usr/src/lib/libthr/thread/thr_syscalls.c:338
#2  0x00000002087481d7 in ?? () from /usr/local/lib/libglib-2.0.so.0
#3  0x00000002087482e4 in g_main_context_iteration () from
/usr/local/lib/libglib-2.0.so.0
#4  0x000000020466d806 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/local/lib/qt5/libQt5Core.so.5
#5  0x000000020f29e6e2 in ?? () from /usr/local/lib/qt5/libQt5XcbQpa.so.5
#6  0x0000000204616a8e in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/local/lib/qt5/libQt5Core.so.5
#7  0x000000020461b66c in QCoreApplication::exec() () from
/usr/local/lib/qt5/libQt5Core.so.5
#8  0x000000020095e013 in octave::gui_application::execute() ()
   from /usr/local/lib/octave/4.4.1/liboctgui.so.4
#9  0x0000000000401d91 in ?? ()
#10 0x00000000004015e5 in ?? ()
#11 0x0000000200629000 in ?? ()
#12 0x0000000000000000 in ?? ()

Thread 1 (LWP 100950):
#0  0x0000000204657e4d in QVariant::QVariant(QVariant const&) () from
/usr/local/lib/qt5/libQt5Core.so.5
#1  0x0000000211b85769 in ?? () from
/usr/local/lib/qt5/plugins/sqldrivers/libqsqlite.so
#2  0x0000000211b80f42 in ?? () from
/usr/local/lib/qt5/plugins/sqldrivers/libqsqlite.so
#3  0x00000002007dc941 in QSqlResult::execBatch(bool) () from
/usr/local/lib/qt5/libQt5Sql.so.5
#4  0x00000002021bfe32 in ?? () from /usr/local/lib/qt5/libQt5Help.so.5
#5  0x00000002021c1ed2 in ?? () from /usr/local/lib/qt5/libQt5Help.so.5
#6  0x0000000204457a2a in ?? () from /usr/local/lib/qt5/libQt5Core.so.5
#7  0x00000002041d8426 in thread_start (curthread=0x211145c00)
    at /usr/src/lib/libthr/thread/thr_create.c:291
#8  0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffbf1f7000



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