[Master] Crash when removing instrument from playing bb track

[groboclown]

I had a BB track playing with 3 kicker instruments in it. While it was playing, I removed one of the tracks, and it crashed.

The stack trace is:

#5  0x00007ffff47eae6f in __cxa_pure_virtual ()
   from /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/libstdc++.so.6
#6  0x000000000049e7a7 in play (_tco_num=0, _offset=69, _frames=59, 
    _start=..., this=<optimized out>)
    at /home/software/lmms-git/lmms.github/src/core/bb_track_container.cpp:71
#7  bbTrackContainer::play (this=<optimized out>, _start=..., _frames=59, 
    _offset=69, _tco_num=0)
    at /home/software/lmms-git/lmms.github/src/core/bb_track_container.cpp:57
#8  0x00000000005819e8 in bbTrack::play (this=<optimized out>, _start=..., 
    _frames=<optimized out>, _offset=69, _tco_num=<optimized out>)
    at /home/software/lmms-git/lmms.github/src/tracks/bb_track.cpp:417
#9  0x00000000004e5ef4 in song::processNextBuffer (this=0x958b50)
    at /home/software/lmms-git/lmms.github/src/core/song.cpp:373
#10 0x00000000004a47ac in Mixer::renderNextBuffer (this=0x95f3a0)
    at /home/software/lmms-git/lmms.github/src/core/Mixer.cpp:375
#11 0x00000000004a4c2c in Mixer::fifoWriter::run (this=0x11947c0)
    at /home/software/lmms-git/lmms.github/src/core/Mixer.cpp:939
#12 0x00007ffff688dbdc in QThreadPrivate::start(void*) ()
   from /usr/lib64/qt4/libQtCore.so.4
#13 0x00007ffff7bc6eb7 in start_thread () from /lib64/libpthread.so.0
#14 0x00007ffff42b39dd in clone () from /lib64/libc.so.6

[tresf]

Is this reproducible? I cannot easily reproduce this on 1.0.3.

[tresf]

If no one can reproduce this, we should close it out as fixed. 👍

[lukas-w]

Can't reproduce this either.