QLinkHut segfaults when clicking on 'Play' (jack)

[umlaeute]

I'm building current HEAD (d4fb22b), on Debian/sid (amd64) (with g++-6, ignoring the issue #16 for now), including the QT examples, and have manually enabled JACK support:

$ mkdir build
$ cd build
$ cmake -DLINK_BUILD_QT_EXAMPLES=ON -DLINK_BUILD_JACK=ON ..
$ make -j -k
[...]
$

This gives me LinkHut, QLinkHut and QLinkHutSilent in bin/)

• running bin/LinkHut seems to work
  • i get audible clicks
  • keystrokes work
  • running multiple instances, they sync
• running bin/QLinkHutSilent seems to work as well
  • i get no audible clicks (expected)
  • clicking on Link i get 0 Links or 1 Links depending on the existance of other (Q)LinkHutSilence instances
  • instances sync
  • clicking on Play i see a colourful beat visualisation
• running bin/QLinkHut almost works
  • i get no audible clicks
  • clicking on Link i get 0 Links or 1 Links depending on the existance of other (Q)LinkHutSilence instances
  • instances sync
  • clicking on Play i get a segfault 😢

$ gdb ./bin/QLinkHut
(gdb) run
Starting program: /foo/bar/ableton-link/build/bin/QLinkHut 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffee96d700 (LWP 12022)]
[New Thread 0x7fffee16c700 (LWP 12023)]
[New Thread 0x7fffed96b700 (LWP 12024)]
[New Thread 0x7fffed8ea700 (LWP 12025)]
[New Thread 0x7fffed869700 (LWP 12026)]
[New Thread 0x7fffe1810700 (LWP 12028)]
[New Thread 0x7fffd840f700 (LWP 12029)]
[New Thread 0x7fffd7c0e700 (LWP 12030)]
[New Thread 0x7fffd740d700 (LWP 12031)]
[New Thread 0x7fffd6c0c700 (LWP 12032)]
[New Thread 0x7fffd61d3700 (LWP 12033)]
[New Thread 0x7fffd48f7700 (LWP 12034)]

Thread 6 "QLinkHut" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffed869700 (LWP 12026)]
0x00007ffff77bcfe0 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
(gdb) bt
#0  0x00007ffff77bcfe0 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#1  0x00007ffff77bd7c1 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#2  0x0000555555730d25 in ableton::linkaudio::AudioPlatform::audioCallback(unsigned int) ()
#3  0x0000555555730c2e in ableton::linkaudio::AudioPlatform::audioCallback(unsigned int, void*) ()
#4  0x00007ffff77ba01e in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#5  0x00007ffff77b97e8 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#6  0x00007ffff77d1040 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#7  0x00007ffff7591464 in start_thread (arg=0x7fffed869700) at pthread_create.c:333
#8  0x00007ffff5bdf9df in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

[fgo-ableton]

Thanks. I also noticed yesterday. Did not notice before because it worked for buffer sizes <= 512. Should be fixed now.