[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Squeak3D crash on 64bits VM (#468)

[Nicolas Cellier]

Christian Kellerman reported this:

> I don't have much time right now but I have attached the trace and
> here's the stack trace from the core dump I get when running the Guardians.image with an openbsd 64bit machine:

```
(gdb) bt
#0  thrkill () at -:3
#1  0x00000c1db668d7de in _libc_abort () at /usr/src/lib/libc/stdlib/abort.c:51
#2  0x00000c1b4d876c72 in sigsegv (sig=-451888, info=Variable "info" is not available.
) at /usr/local/smalltalk/opensmalltalk-vm/platforms/unix/vm/sqUnixMain.c:1129
#3  <signal handler called>
#4  copyBitsLockedAndClipped () at /usr/local/smalltalk/opensmalltalk-vm/src/plugins/BitBltPlugin/BitBltPlugin.c:820
#5  0x00000c1b4d9486f9 in copyBitsFromtoat (startX=Variable "startX" is not available.
) at /usr/local/smalltalk/opensmalltalk-vm/src/plugins/BitBltPlugin/BitBltPlugin.c:1257
#6  0x00000c1df5b0ac9e in b3dMainLoop (state=Variable "state" is not available.
) at /usr/local/smalltalk/opensmalltalk-vm/platforms/Cross/plugins/Squeak3D/b3dMain.c:1146
#7  0x00000c1df5b020c8 in b3dStartRasterizer () at /usr/local/smalltalk/opensmalltalk-vm/src/plugins/Squeak3D/Squeak3D.c:1704
#8  0x00000c1b4d8d4838 in primitiveExternalCall () at /usr/local/smalltalk/opensmalltalk-vm/spur64src/vm/gcc3x-cointerp.c:76948

```

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