golfed.pl

# Expects to be live in .../zavolaj/
use lib '.';
use t::CompileTestLib;
use NativeCall;
    
compile_test_lib('08-callbacks');

sub TakeACallback(&cb()) is native('./08-callbacks') { * }

sub simple_callback() {
    say 'simple callback';
}   

TakeACallback(&simple_callback);
pir::sweep__vi(1);
    
# vim:ft=perl6 

Just for the elucidation of others working on this, the last line of code (the call to sweep) is what triggers the problem.

There is some kind of memory corruption going on, because one of the pointers just before the segfault has a pointer value of 0x21, which is an invalid memory address.

We are currently debugging this at the YAPC::NA hackathon

And for reference, the pointer value changes a bit on each run (it could be a counter getting overridden a pointer) but it is consistently a very low hexadecimal number that is not a valid memory address.