#1746: A way to get Rakudo to segfault
-------------------+--------------------------------------------------------
Reporter: masak | Type: bug
Status: new | Priority: major
Milestone: | Component: core
Version: 2.6.0 | Severity: medium
Keywords: | Lang: perl6
Patch: | Platform: all
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Comment(by nwellnhof):
After a very long debugging session, I think I tracked this bug down. It's
in the Rakudo code. Have a look at line 150 in rebless_subclass in
src/ops/perl6.ops:
{{{
new_ins->vtable = interp->vtables[p6o_id];
}}}
The class of new_ins is changed. The problem is that the PMC data of
new_ins has been allocated from the memory pool of the old class. When it
gets freed, it's freed from the pool of the new class resulting in a
corrupted free list.
So it seems that rebless_subclass has to reallocate the PMC data.
--
Ticket URL: <https://trac.parrot.org/parrot/ticket/1746#comment:9>
Parrot <https://trac.parrot.org/parrot/>
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