I can make PulseView segfault within a minute or so by fiddling with the "conversion thresholds" box for a Hantek 6022BE capture.

I'm not sure what actually causes the crash. Typing random values in (including invalid values) quickly? I suspect that there's some cross-thread race condition to do with re-computing the logic level graph, and re-submitting the logic level computation?

Note that, if you cause this crash, your X may hang up (as it thinks a menu is focused). Yay, X.

Here's one crash, I think I saw another inside Qt but I have lost it due to the aforementioned X rage. Note the "this=0x0":


[Thread 0x7fffd212e700 (LWP 23493) exited]
[New Thread 0x7fffd212e700 (LWP 23494)]
[New Thread 0x7fffd212e700 (LWP 23495)]
[Thread 0x7fffd212e700 (LWP 23494) exited]
[Thread 0x7fffd212e700 (LWP 23495) exited]
[New Thread 0x7fffd212e700 (LWP 23496)]

Thread 1 "pulseview" received signal SIGSEGV, Segmentation fault.
pv::data::Segment::segment_id (this=0x0) at /home/faux/code/sigrok/pulseview/pv/data/segment.cpp:96
96              return segment_id_;
(gdb) bt
#0  0x000055555561e370 in pv::data::Segment::segment_id() const (this=0x0)
    at /home/faux/code/sigrok/pulseview/pv/data/segment.cpp:96
#1  0x000055555567a088 in pv::views::ViewBase::on_samples_added(QObject*, unsigned long, unsigned long) (this=0x555555cc0fe0, segment=<optimised out>, start_sample=<optimised out>, end_sample=<optimised out>)
    at /home/faux/code/sigrok/pulseview/pv/views/viewbase.cpp:163
#2  0x000055555569fbb2 in pv::views::ViewBase::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=<optimised out>, _id=<optimised out>, _a=<optimised out>, _c=<optimised out>)
    at /home/faux/code/sigrok/pulseview/build/pulseview_autogen/M3OR24FOW2/moc_viewbase.cpp:113
#3  0x00007ffff542fd72 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff61bd753 in QWidget::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#5  0x00007ffff617e82c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#6  0x00007ffff61860f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#7  0x00005555555da95b in Application::notify(QObject*, QEvent*) (this=<optimised out>, receiver=<optimised out>, event=<optimised out>) at /home/faux/code/sigrok/pulseview/pv/application.cpp:41
#8  0x00007ffff5400628 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ffff5402d9d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007ffff5459f13 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007ffff68bd117 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007ffff68bd350 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007ffff68bd3dc in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007ffff545953f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007ffff53fe67a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007ffff54076c4 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00005555555d83e6 in main(int, char**) (argc=<optimised out>, argv=<optimised out>)
    at /home/faux/code/sigrok/pulseview/main.cpp:227
(gdb)

(gdb) info threads
  Id   Target Id         Frame
* 1    Thread 0x7ffff7fa5800 (LWP 23267) "pulseview" pv::data::Segment::segment_id (this=0x0)
    at /home/faux/code/sigrok/pulseview/pv/data/segment.cpp:96
  2    Thread 0x7fffe953a700 (LWP 23271) "QXcbEventReader" 0x00007ffff4557bf9 in __GI___poll (fds=0x7fffe9539ca8, nfds=1,
    timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
  3    Thread 0x7fffe3fff700 (LWP 23272) "pulseview" 0x00007ffff4557bf9 in __GI___poll (fds=0x7fffe3ffee00, nfds=2, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
  4    Thread 0x7fffe3435700 (LWP 23273) "QDBusConnection" 0x00007ffff4557bf9 in __GI___poll (fds=0x7fffdc004db0, nfds=2,
    timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
  94   Thread 0x7fffd212e700 (LWP 23496) "pulseview" 0x000055555561583a in pv::data::LogicSegment::unpack_sample (
    this=this@entry=0x7fffad74bc50, ptr=0x7fffa59e6af5 '\001' <repeats 200 times>...)
    at /home/faux/code/sigrok/pulseview/pv/data/logicsegment.cpp:71
(gdb) thread 94
[Switching to thread 94 (Thread 0x7fffd212e700 (LWP 23496))]
#0  0x000055555561583a in pv::data::LogicSegment::unpack_sample (this=this@entry=0x7fffad74bc50,
    ptr=0x7fffa59e6af5 '\001' <repeats 200 times>...) at /home/faux/code/sigrok/pulseview/pv/data/logicsegment.cpp:71
71              switch (unit_size_) {
(gdb) bt
#0  0x000055555561583a in pv::data::LogicSegment::unpack_sample(unsigned char const*) const (this=this@entry=0x7fffad74bc50, ptr=0x7fffa59e6af5 '\001' <repeats 200 times>...) at /home/faux/code/sigrok/pulseview/pv/data/logicsegment.cpp:71
#1  0x0000555555615b7c in pv::data::LogicSegment::append_payload_to_mipmap() (this=this@entry=0x7fffad74bc50)
    at /home/faux/code/sigrok/pulseview/pv/data/logicsegment.cpp:246
#2  0x0000555555615d14 in pv::data::LogicSegment::append_payload(void*, unsigned long) (this=0x7fffad74bc50, data=<optimised out>, data_size=<optimised out>) at /home/faux/code/sigrok/pulseview/pv/data/logicsegment.cpp:159
#3  0x0000555555619862 in pv::data::SignalBase::convert_single_segment(pv::data::AnalogSegment*, pv::data::LogicSegment*) (this=this@entry=0x7fffe4009610, asegment=asegment@entry=0x7fffd4006500, lsegment=lsegment@entry=0x7fffad74bc50)
    at /home/faux/code/sigrok/pulseview/pv/data/signalbase.cpp:484
#4  0x000055555561a7fe in pv::data::SignalBase::conversion_thread_proc() (this=0x7fffe4009610)
    at /home/faux/code/sigrok/pulseview/pv/data/signalbase.cpp:585
#5  0x00007ffff4ea8373 in  () at /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007ffff75606db in start_thread (arg=0x7fffd212e700) at pthread_create.c:463
#7  0x00007ffff456488f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb)


I'm running HEAD libsigrok, libsigrokdecode, pulsview, as of ~yesterday. 

7b7ab1f5cb3607bf29885eeffcb2cb215b2c9e9f
Date:   Sat Feb 10 10:52:16 2018 +0100

I'm using an unholy system, a mix of pre-release Ubuntu 18.04 and Qt 5.9.4 dev packages, so it might be that. amd64. Optimised build. Quad-core + HT i7-3770k. 50M samples, 8MHz.