I was able to get a backtrace from a core dump file. I am attaching it to this post. It's from LMMS 0.4.6.

On 12/05/2009 02:36 PM, Andy Kelley wrote:
ok I'll look into this

On Sat, Dec 5, 2009 at 5:25 AM, Nikos Chantziaras <rea...@arcor.de
<mailto:rea...@arcor.de>> wrote:

    Git master.  This has been happening for quite a while though, it
    didn't start by a recent commit.


    On 12/05/2009 02:18 PM, Andy Kelley wrote:

        which version?

        On Fri, Dec 4, 2009 at 6:36 PM, Nikos Chantziaras
        <rea...@arcor.de <mailto:rea...@arcor.de>
        <mailto:rea...@arcor.de <mailto:rea...@arcor.de>>> wrote:

            LMMS is segfaulting almost all the time if I play notes
        quickly using
            the keyboard or the mouse (holding the mouse button and
        moving the mouse
            quickly left/right over the piano view):

            lmms[2594] trap int3 ip:3000c059a1 sp:7fffffffc988 error:0
            lmms[13203]: segfault at 8 ip 0000003000475072 sp
        00007fffece442a0 error
            4 in libc-2.11.so <http://libc-2.11.so>
        <http://libc-2.11.so>[3000400000+14f000]
--
[New Thread 3575]
[New Thread 3573]
[New Thread 3577]
Core was generated by `./lmms'.
Program terminated with signal 11, Segmentation fault.
#0  QMetaObject::removeGuard (ptr=<value optimized out>) at 
kernel/qobject.cpp:458
        in kernel/qobject.cpp

Thread 4 (Thread 3577):
#0  0x0000003000c0e07d in write () from /lib/libpthread.so.0
No symbol table info available.
#1  0x0000000000587f59 in AudioOss::run (this=0x1978040)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/src/core/audio/AudioOss.cpp:318
        frames = <value optimized out>
        bytes = 1024
        temp = 0x22d2270
        outbuf = 0x22d2a80
#2  0x0000003007a73215 in QThreadPrivate::start (arg=<value optimized out>) at 
thread/qthread_unix.cpp:248
        data = <value optimized out>
#3  0x0000003000c06894 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#4  0x00000030004d064d in clone () from /lib/libc.so.6
No symbol table info available.
#5  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 3 (Thread 3573):
#0  0x0000003000c0b1fc in pthread_cond_wait@@GLIBC_2.3.2 () from 
/lib/libpthread.so.0
No symbol table info available.
#1  0x0000003007a741db in QWaitConditionPrivate::wait (this=<value optimized 
out>, mutex=<value optimized out>, 
    time=<value optimized out>) at thread/qwaitcondition_unix.cpp:87
        code = <value optimized out>
#2  QWaitCondition::wait (this=<value optimized out>, mutex=<value optimized 
out>, time=<value optimized out>)
    at thread/qwaitcondition_unix.cpp:159
        returnValue = <value optimized out>
#3  0x000000000056d27b in MixerWorkerThread::run (this=0x1805e50)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/src/core/mixer.cpp:188
        m = {d = 0x17d3580}
#4  0x0000003007a73215 in QThreadPrivate::start (arg=<value optimized out>) at 
thread/qthread_unix.cpp:248
        data = <value optimized out>
#5  0x0000003000c06894 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#6  0x00000030004d064d in clone () from /lib/libc.so.6
No symbol table info available.
#7  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 2 (Thread 3575):
#0  0x000000306d44feac in EffectMgr::out (this=<value optimized out>, 
smpsl=<value optimized out>, smpsr=<value optimized out>)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/plugins/zynaddsubfx/src/Effects/EffectMgr.cpp:218
        volume = <value optimized out>
#1  0x000000306d429def in Part::ComputePartSmps (this=<value optimized out>)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/plugins/zynaddsubfx/src/Misc/Part.cpp:1015
        routeto = <value optimized out>
        i = <value optimized out>
        k = <value optimized out>
        noteplay = 48
#2  0x000000306d4220c0 in Master::AudioOut (this=<value optimized out>, 
outl=<value optimized out>, outr=<value optimized out>)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/plugins/zynaddsubfx/src/Misc/Master.cpp:289
        i = <value optimized out>
        npart = <value optimized out>
        nefx = 4
#3  0x000000306d41974e in LocalZynAddSubFx::processAudio (this=<value optimized 
out>, _out=<value optimized out>)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/plugins/zynaddsubfx/LocalZynAddSubFx.cpp:224
No locals.
#4  0x00007fe67d221ae4 in ZynAddSubFxInstrument::play (this=0x2492930, 
_buf=0x186e410)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/plugins/zynaddsubfx/ZynAddSubFx.cpp:223
No locals.
#5  0x0000000000568b8d in MixerWorkerThread::processJobQueue (this=0x17d3b00)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/src/core/mixer.cpp:218
        i = <value optimized out>
#6  0x000000000056afd0 in mixer::renderNextBuffer (this=0x1806f90)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/src/core/mixer.cpp:620
        timer = {begin = {tv_sec = 1264600368, tv_usec = 908249}}
        last_metro_pos = {<midiTime> = {m_ticks = -1, static s_ticksPerTact = 
192}, m_timeLine = 0x0, m_timeLineUpdate = true, 
          m_currentFrame = 0}
#7  0x000000000056b7b4 in mixer::fifoWriter::run (this=0x22ce680)
    at 
/var/tmp/portage/media-sound/lmms-0.4.6/work/lmms-0.4.6/src/core/mixer.cpp:1184
        b = <value optimized out>
        frames = <value optimized out>
#8  0x0000003007a73215 in QThreadPrivate::start (arg=<value optimized out>) at 
thread/qthread_unix.cpp:248
        data = <value optimized out>
#9  0x0000003000c06894 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#10 0x00000030004d064d in clone () from /lib/libc.so.6
No symbol table info available.
#11 0x0000000000000000 in ?? ()
No symbol table info available.

Thread 1 (Thread 3571):
#0  QMetaObject::removeGuard (ptr=<value optimized out>) at 
kernel/qobject.cpp:458
        hash = <value optimized out>
        locker = 
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