<p>Running with the assert VM in lldb:</p>
<pre><code>(lldb) run Pharo.image gccrash.st
Process 251 launched: '/home/alistair/pharo8/gccrash/vm/lib/pharo/5.0-201911140223/pharo' (x86_64)
((classIndex >= 1) && (classIndex <= (classTablePageSize()))) 50170
((classIndex >= 1) && (classIndex <= (classTablePageSize()))) 50170
Process 251 stopped
* thread #1, name = 'pharo', stop reason = signal SIGIO
frame #0: 0x00007ffff6a2403f libc.so.6`__select + 95
libc.so.6`__select:
-> 0x7ffff6a2403f <+95>: cmpq $-0x1000, %rax ; imm = 0xF000
0x7ffff6a24045 <+101>: ja 0x7ffff6a2407a ; <+154>
0x7ffff6a24047 <+103>: movl %r9d, %edi
0x7ffff6a2404a <+106>: movl %eax, 0xc(%rsp)
(lldb) bt
* thread #1, name = 'pharo', stop reason = signal SIGIO
* frame #0: 0x00007ffff6a2403f libc.so.6`__select + 95
frame #1: 0x00000000004a91ce pharo`aioPoll(microSeconds=50000) at aio.c:316
frame #2: 0x00007ffff358d6de vm-display-X11.so`display_ioRelinquishProcessorForMicroseconds(microSeconds=<unavailable>) at sqUnixX11.c:4943
frame #3: 0x0000000000419d3e pharo`ioRelinquishProcessorForMicroseconds(us=<unavailable>) at sqUnixMain.c:588
frame #4: 0x0000000000468de6 pharo`primitiveRelinquishProcessor at gcc3x-cointerp.c:34635
frame #5: 0x00000000004235f9 pharo`interpret at gcc3x-cointerp.c:6203
frame #6: 0x000000000042b5f1 pharo`enterSmalltalkExecutiveImplementation at gcc3x-cointerp.c:16294
frame #7: 0x000000000041d6d1 pharo`interpret at gcc3x-cointerp.c:2772
frame #8: 0x000000000041bae6 pharo`main(argc=3, argv=0x00007fffffffe288, envp=<unavailable>) at sqUnixMain.c:2150
frame #9: 0x00007ffff692eb97 libc.so.6`__libc_start_main + 231
frame #10: 0x00000000004197ca pharo`_start + 42
</code></pre>
<p>Thanks, Eliot!</p>
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