I'm staring at a crash, my eyes are glazing over, and I need sleep. So I was wondering if anyone would be interested in taking a look at a .imc file that is giving me a seg fault while marking a hash in a gc run triggered by a hash PMC allocation. Or at least tell me whether it's seg faulting on your machine too.
I'll attach the 5KB compressed .imc file (25KB uncompressed; PIR code
is redundant!) It's generated from the following Perl6 code, but you'd
need my local changes in order to regenerate it:
rule thing() {
<[a-z]>+
}
rule parens() {
{ print "entering parens\n"; }
\( [ <thing> | <parens> | \s ]* \)
{ print "leaving parens\n"; }
}
sub main() {
my $t = "()()(((blah blah () blah))(blah))";
my $t2 = $t _ ")";
print "ok 8\n" if $t2 !~ /^ <parens> $/;
}
(the "entering/leaving parens" printouts have no effect on the bug;
they're just remnants of my flailing.)
If you run with --gc-debug, it dies a little earlier, but in what
appears to be the same op.
Hopefully,
Steve
hash_bug.imc.gz
Description: GNU Zip compressed data
