consistent signal 11 during application close

hi,

i am seeing the following crash (consistently) during Py_Finalize. here is the back-trace

 gdb ./basic
GNU gdb (GDB) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./basic...(no debugging symbols found)...done.
(gdb) run
Starting program: /home/anupam/source-code/c++/matplotlib-cpp.git/examples/basic 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007fffe94fd1d3 in QApplication::~QApplication() () from /usr/lib/libQtGui.so.4
(gdb) where
#0  0x00007fffe94fd1d3 in QApplication::~QApplication() () from /usr/lib/libQtGui.so.4
#1  0x00007fffea5927a9 in ?? () from /usr/lib/python2.7/site-packages/PyQt4/QtGui.so
#2  0x00007fffea5928ce in ?? () from /usr/lib/python2.7/site-packages/PyQt4/QtGui.so
#3  0x00007fffeb8f4c89 in ?? () from /usr/lib/python2.7/site-packages/sip.so
#4  0x00007fffeb8f62a9 in ?? () from /usr/lib/python2.7/site-packages/sip.so
#5  0x00007ffff7a92c53 in subtype_dealloc () from /usr/lib/libpython2.7.so.1.0
#6  0x00007ffff7a747df in insertdict_by_entry () from /usr/lib/libpython2.7.so.1.0
#7  0x00007ffff7a76330 in dict_set_item_by_hash_or_entry () from /usr/lib/libpython2.7.so.1.0
#8  0x00007ffff7a7b1ec in _PyModule_Clear () from /usr/lib/libpython2.7.so.1.0
#9  0x00007ffff7aeed5d in PyImport_Cleanup () from /usr/lib/libpython2.7.so.1.0
#10 0x00007ffff7afb0fd in Py_Finalize () from /usr/lib/libpython2.7.so.1.0
#11 0x0000000000402201 in matplotlibcpp::detail::_interpreter::~_interpreter() ()
#12 0x00007ffff6de5990 in __run_exit_handlers () from /usr/lib/libc.so.6
#13 0x00007ffff6de59ea in exit () from /usr/lib/libc.so.6
#14 0x00007ffff6dd0298 in __libc_start_main () from /usr/lib/libc.so.6
#15 0x000000000040143a in _start ()
(gdb)

'basic' here is examples/basic.cpp

here are some environment details:

g++ --version
g++ (GCC) 6.2.1 20160830
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

uname -a
Linux fatcat 4.7.4-1-ARCH #1 SMP PREEMPT Thu Sep 15 15:24:29 CEST 2016 x86_64 GNU/Linux

of course, removing the Py_Finalize from the destructor 'solves' the problem, but that is cheating :)

Hm, interesting :) To be sure, this is on an unmodified examples/basic.cpp?

Hm, interesting :) To be sure, this is on an unmodified examples/basic.cpp?

yes it is.

I confirm same behavior on example minimal.cpp.
On centos7 64 bits

#0  0x00007fffe4940c84 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#1  0x00007fffe2b52b2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#2  0x00007fffe2b594d5 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#3  0x00007fffe3bcf806 in sipQApplication::notify(QObject*, QEvent*) () at /usr/lib64/python2.7/site-packages/PyQt4/QtGui.so
#4  0x00007fffe4940b2d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#5  0x00007fffe2b99994 in QWidgetPrivate::setWinId(unsigned long) () at /lib64/libQtGui.so.4
#6  0x00007fffe2be732e in QWidget::destroy(bool, bool) () at /lib64/libQtGui.so.4
#7  0x00007fffe2ba1cd0 in QWidget::~QWidget() () at /lib64/libQtGui.so.4
#8  0x00007fffe3a1aeb9 in sipQMainWindow::~sipQMainWindow() () at /usr/lib64/python2.7/site-packages/PyQt4/QtGui.so
#9  0x00007fffe3a1af2e in release_QMainWindow () at /usr/lib64/python2.7/site-packages/PyQt4/QtGui.so
#10 0x00007fffe513ff46 in forgetObject () at /usr/lib64/python2.7/site-packages/sip.so
#11 0x00007fffe5140f59 in sipWrapper_dealloc () at /usr/lib64/python2.7/site-packages/sip.so
#12 0x00007ffff7ab1173 in subtype_dealloc () at /lib64/libpython2.7.so.1.0
#13 0x00007ffff7b24adb in collect () at /lib64/libpython2.7.so.1.0
#14 0x00007ffff7b250d8 in PyGC_Collect () at /lib64/libpython2.7.so.1.0
#15 0x00007ffff7b12249 in Py_Finalize () at /lib64/libpython2.7.so.1.0
#16 0x0000000000402adf in matplotlibcpp::detail::_interpreter::~_interpreter() ()
#17 0x00007ffff6e6ce69 in __run_exit_handlers () at /lib64/libc.so.6
#18 0x00007ffff6e6ceb5 in  () at /lib64/libc.so.6
#19 0x00007ffff6e55b1c in __libc_start_main () at /lib64/libc.so.6
#20 0x00000000004017d9 in _start ()

This is due to some unknown conflicts between Qt-based backend and matplotlib-cpp. An easy solution is to replace the backend with GTK3Agg by setting an environment variable:

export MPLBACKEND=GTK3Agg

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consistent signal 11 during application close #11

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lava commented on Sep 28, 2016

anupamk commented on Sep 28, 2016

sophana commented on Jun 19, 2017

xizou commented on Jun 13, 2020

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