Re: [Qtractor-devel] Regressions in current drumkv1 Git

[Frank N. <bea...@we...>]

Hi Rui and all,

...
> > Also, I don't need to connect any JACK audio ports of drumkv1_jack to my soundcard
> > to provoke the crash. It's enough to connect MIDI, play MIDI events into drumkv1_jack
> > via a keyboard while I am quickly switching the sound bank for a little while
> > (Cursor-Up/Down in the "Recently used" dropdown box helps to reproduce this quickly).
> > 
> 
> drumkv1 0.9.2.36git.1e208a might do better in this regard, you tell me...
> 
> 
> > Anything else how I can help in digging deeper? Do you need my test data (tiny drum pattern track)?
> > I'd love to see this one squashed, https://sonoj.org is just around the corner ;-).
> > 
> 
> don't switch presets like mad!? you're asking for non pleasant sounds
> and nasty things to happen if you insist doing that :)

Well, of course the goal is not simply to switch presets quickly because it
sounds nasty :-), but rather stabilize the "normal preset switching",
and I provoke that with quick switching. Nobody likes to see a sequencer app
dying in front of your eyes because of a harmless preset switch while you
were just in a "creative moment" :-).

Anyway, I tried the new revision, and it's getting more difficult/takes more time
to create crashes :-), but I still see one occasionally, though it looks a little
different now. The console output shows me:

...
drumkv1widget::clearSampleFile()
drumkv1widget::activateElement(36)
drumkv1widget::updateSchedNotify(0, 0x0000)
drumkv1widget::loadPreset("/home/franky/work/audio/CR78/My_Roland_CR78_Kit.drumkv1")
pure virtual method called
terminate called without an active exception
Aborted (core dumped)

and inspecting the core dump with gdb shows this:

> gdb /usr/local/bin/drumkv1_jack /tmp/core 
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from /usr/local/bin/drumkv1_jack...done.
[New LWP 6265]
[New LWP 6261]
[New LWP 6259]
[New LWP 6260]
[New LWP 6263]
[New LWP 6262]
[New LWP 6264]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `drumkv1_jack'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f6d19286428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
54      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
[Current thread is 1 (Thread 0x7f6cff8b7700 (LWP 6265))]
(gdb) bt
#0  0x00007f6d19286428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
#1  0x00007f6d1928802a in __GI_abort () at abort.c:89
#2  0x00007f6d198c084d in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007f6d198be6b6 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007f6d198be701 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007f6d198bf23f in __cxa_pure_virtual () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007f6d1ac1a425 in drumkv1_ramp::process (this=0x2abf198, nframes=128) at drumkv1_ramp.h:74
#7  0x00007f6d1ac182c3 in drumkv1_impl::process (this=0x18e3190, ins=0x7f6cff8b6850, outs=0x7f6cff8b6830, nframes=128) at drumkv1.cpp:2232
#8  0x00007f6d1ac18b5a in drumkv1::process (this=0x18dd050, ins=0x7f6cff8b6850, outs=0x7f6cff8b6830, nframes=128) at drumkv1.cpp:2502
#9  0x000000000040a9ad in drumkv1_jack::process (this=0x18dd050, nframes=128) at drumkv1_jack.cpp:276
#10 0x000000000040a06a in drumkv1_jack_process (nframes=128, arg=0x18dd050) at drumkv1_jack.cpp:112
#11 0x00007f6d1b36bc1e in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#12 0x00007f6d1b36b058 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#13 0x00007f6d1b383680 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#14 0x00007f6d19bba6ba in start_thread (arg=0x7f6cff8b7700) at pthread_create.c:333
#15 0x00007f6d1935841d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

As usual - if I shall provide more debug info, let me know.

Greetings,
Frank