Public bug reported:
the segmentation fault happends when a client writes to the SYSRESET
channel of an IOCSTATS - IOC. This kills the IOC and the call of
ca_clear_event() of SYSRESET on the client gives a this error.
What can be seen too: is that all connected channels gets a clean
disconnect except SYSRESET.
This happends with our 3.14.12 and with 7.0.3
gdb backtrace of caqtdm(epics 3.14.12):
#0 0x0000000000000000 in ?? ()
#1 0x00007fffee1d2f74 in ca_client_context::eliminateExcessiveSendBacklog (this=0x8f8f20, guard=..., chan=...) at ../ca_client_context.cpp:791
#2 0x00007fffee1d30d1 in eliminateExcessiveSendBacklog (pMon=<value optimized out>) at ../oldAccess.h:482
#3 ca_clear_subscription (pMon=<value optimized out>) at ../ca_client_context.cpp:761
#4 0x00007fffe79e80d6 in ClearMonitor (kData=<value optimized out>) at epicsSubs.c:937
#5 0x00007fffe79e39e5 in Epics3Plugin::pvClearMonitor (this=0x8f74e0, kData=0x7fffffffa600) at epics3_plugin.cpp:86
#6 0x00007ffff7d79f39 in CaQtDM_Lib::closeEvent (this=0x12016bb0, ce=<value optimized out>) at src/caqtdm_lib.cpp:6445
#7 0x00000030c67f5cbc in QWidget::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#8 0x00000030c6b898eb in QMainWindow::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#9 0x00000030c67aaa0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#10 0x00000030c67b094b in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#11 0x00000030bfb57d0c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#12 0x00000030c67fa711 in QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) () from /usr/lib64/libQtGui.so.4
#13 0x00000030c68134b6 in QApplication::x11ClientMessage(QWidget*, _XEvent*, bool) () from /usr/lib64/libQtGui.so.4
#14 0x00000030c68213c6 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/libQtGui.so.4
#15 0x00000030c6849e92 in ?? () from /usr/lib64/libQtGui.so.4
#16 0x00000030b8a40555 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#17 0x00000030b8a44d08 in ?? () from /lib64/libglib-2.0.so.0
#18 0x00000030b8a44ec2 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#19 0x00000030bfb7d613 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#20 0x00000030c6849b5e in ?? () from /usr/lib64/libQtGui.so.4
#21 0x00000030bfb56752 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#22 0x00000030bfb56a1c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#23 0x00000030bfb58d09 in QCoreApplication::exec() () from /usr/lib64/libQtCore.so.4
#24 0x000000000040e132 in main ()
gdb backtrace of caqtdm(epics 7.0.3):
#0 0x0000000000000000 in ?? ()
#1 0x00007fffd75df200 in ca_client_context::eliminateExcessiveSendBacklog (this=0x9259c0, guard=..., chan=...) at ../ca_client_context.cpp:785
#2 0x00007fffd75c2949 in eliminateExcessiveSendBacklog (this=0xc55a98, this=0xc55a98, guard=...) at ../oldAccess.h:481
#3 ca_clear_channel (pChan=0xc55a98) at ../access.cpp:371
#4 0x00007fffdc0c590d in ClearMonitor (kData=<optimized out>) at epicsSubs.c:942
#5 0x00007fffdc0c0a3f in Epics3Plugin::pvClearMonitor (this=0x89ba50, kData=0x7fffffffa700) at epics3_plugin.cpp:87
#6 0x00007ffff7b4e531 in CaQtDM_Lib::closeEvent (this=0x1049ff0, ce=<optimized out>) at src/caqtdm_lib.cpp:6445
#7 0x00007ffff5eb5db4 in QWidget::event(QEvent*) () from /lib64/libQtGui.so.4
#8 0x00007ffff62870d3 in QMainWindow::event(QEvent*) () from /lib64/libQtGui.so.4
#9 0x00007ffff5e600ec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#10 0x00007ffff5e669c5 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#11 0x00007ffff592e87d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib64/libQtCore.so.4
#12 0x00007ffff5eb1fd9 in QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) () from /lib64/libQtGui.so.4
#13 0x00007ffff5ed0e32 in QApplication::x11ClientMessage(QWidget*, _XEvent*, bool) () from /lib64/libQtGui.so.4
#14 0x00007ffff5edd98f in QApplication::x11ProcessEvent(_XEvent*) () from /lib64/libQtGui.so.4
#15 0x00007ffff5f04f34 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQtGui.so.4
#16 0x00007ffff1f3f049 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#17 0x00007ffff1f3f3a8 in g_main_context_iterate.isra.19 () from /lib64/libglib-2.0.so.0
#18 0x00007ffff1f3f45c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#19 0x00007ffff595d3ae in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#20 0x00007ffff5f050b6 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtGui.so.4
#21 0x00007ffff592d30f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#22 0x00007ffff592d65d in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#23 0x00007ffff5932d29 in QCoreApplication::exec() () from /lib64/libQtCore.so.4
#24 0x000000000040defd in main (argc=4, argv=<optimized out>) at src/caQtDM.cpp:390
** Affects: epics-base
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1877113
Title:
call ca_clear_event gives a seg fault
Status in EPICS Base:
New
Bug description:
the segmentation fault happends when a client writes to the SYSRESET
channel of an IOCSTATS - IOC. This kills the IOC and the call of
ca_clear_event() of SYSRESET on the client gives a this error.
What can be seen too: is that all connected channels gets a clean
disconnect except SYSRESET.
This happends with our 3.14.12 and with 7.0.3
gdb backtrace of caqtdm(epics 3.14.12):
#0 0x0000000000000000 in ?? ()
#1 0x00007fffee1d2f74 in ca_client_context::eliminateExcessiveSendBacklog (this=0x8f8f20, guard=..., chan=...) at ../ca_client_context.cpp:791
#2 0x00007fffee1d30d1 in eliminateExcessiveSendBacklog (pMon=<value optimized out>) at ../oldAccess.h:482
#3 ca_clear_subscription (pMon=<value optimized out>) at ../ca_client_context.cpp:761
#4 0x00007fffe79e80d6 in ClearMonitor (kData=<value optimized out>) at epicsSubs.c:937
#5 0x00007fffe79e39e5 in Epics3Plugin::pvClearMonitor (this=0x8f74e0, kData=0x7fffffffa600) at epics3_plugin.cpp:86
#6 0x00007ffff7d79f39 in CaQtDM_Lib::closeEvent (this=0x12016bb0, ce=<value optimized out>) at src/caqtdm_lib.cpp:6445
#7 0x00000030c67f5cbc in QWidget::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#8 0x00000030c6b898eb in QMainWindow::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#9 0x00000030c67aaa0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#10 0x00000030c67b094b in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#11 0x00000030bfb57d0c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#12 0x00000030c67fa711 in QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) () from /usr/lib64/libQtGui.so.4
#13 0x00000030c68134b6 in QApplication::x11ClientMessage(QWidget*, _XEvent*, bool) () from /usr/lib64/libQtGui.so.4
#14 0x00000030c68213c6 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/libQtGui.so.4
#15 0x00000030c6849e92 in ?? () from /usr/lib64/libQtGui.so.4
#16 0x00000030b8a40555 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#17 0x00000030b8a44d08 in ?? () from /lib64/libglib-2.0.so.0
#18 0x00000030b8a44ec2 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#19 0x00000030bfb7d613 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#20 0x00000030c6849b5e in ?? () from /usr/lib64/libQtGui.so.4
#21 0x00000030bfb56752 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#22 0x00000030bfb56a1c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#23 0x00000030bfb58d09 in QCoreApplication::exec() () from /usr/lib64/libQtCore.so.4
#24 0x000000000040e132 in main ()
gdb backtrace of caqtdm(epics 7.0.3):
#0 0x0000000000000000 in ?? ()
#1 0x00007fffd75df200 in ca_client_context::eliminateExcessiveSendBacklog (this=0x9259c0, guard=..., chan=...) at ../ca_client_context.cpp:785
#2 0x00007fffd75c2949 in eliminateExcessiveSendBacklog (this=0xc55a98, this=0xc55a98, guard=...) at ../oldAccess.h:481
#3 ca_clear_channel (pChan=0xc55a98) at ../access.cpp:371
#4 0x00007fffdc0c590d in ClearMonitor (kData=<optimized out>) at epicsSubs.c:942
#5 0x00007fffdc0c0a3f in Epics3Plugin::pvClearMonitor (this=0x89ba50, kData=0x7fffffffa700) at epics3_plugin.cpp:87
#6 0x00007ffff7b4e531 in CaQtDM_Lib::closeEvent (this=0x1049ff0, ce=<optimized out>) at src/caqtdm_lib.cpp:6445
#7 0x00007ffff5eb5db4 in QWidget::event(QEvent*) () from /lib64/libQtGui.so.4
#8 0x00007ffff62870d3 in QMainWindow::event(QEvent*) () from /lib64/libQtGui.so.4
#9 0x00007ffff5e600ec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#10 0x00007ffff5e669c5 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#11 0x00007ffff592e87d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib64/libQtCore.so.4
#12 0x00007ffff5eb1fd9 in QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) () from /lib64/libQtGui.so.4
#13 0x00007ffff5ed0e32 in QApplication::x11ClientMessage(QWidget*, _XEvent*, bool) () from /lib64/libQtGui.so.4
#14 0x00007ffff5edd98f in QApplication::x11ProcessEvent(_XEvent*) () from /lib64/libQtGui.so.4
#15 0x00007ffff5f04f34 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQtGui.so.4
#16 0x00007ffff1f3f049 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#17 0x00007ffff1f3f3a8 in g_main_context_iterate.isra.19 () from /lib64/libglib-2.0.so.0
#18 0x00007ffff1f3f45c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#19 0x00007ffff595d3ae in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#20 0x00007ffff5f050b6 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtGui.so.4
#21 0x00007ffff592d30f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#22 0x00007ffff592d65d in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#23 0x00007ffff5932d29 in QCoreApplication::exec() () from /lib64/libQtCore.so.4
#24 0x000000000040defd in main (argc=4, argv=<optimized out>) at src/caQtDM.cpp:390
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- Replies:
- [Bug 1877113] Re: call ca_clear_event gives a seg fault mdavidsaver via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault Helge Brands via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault Ralph Lange via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault mdavidsaver via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault Helge Brands via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault mdavidsaver via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault mdavidsaver via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault Helge Brands via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault mdavidsaver via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault Helge Brands via Core-talk
- [Bug 1877113] Re: call ca_clear_event gives a seg fault Helge Brands via Core-talk
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