#1499: Null pointer dereference in imageio.pmc
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Reporter: arnsholt | Owner: plobsing
Type: bug | Status: new
Priority: normal | Milestone:
Component: none | Version:
Severity: medium | Keywords:
Lang: perl6 | Patch:
Platform: darwin |
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Comment(by plobsing):
Replying to [comment:8 plobsing]:
> * The intermittent-ness of this bug is what really bothers me. gc_ms is
deterministic, freeze/thaw is deterministic, I certainly hope our math is
deterministic, so where is the randomness coming from?
I've found out where the randomness is comming from: hash seeding, which
currently uses the current time.
Unfortunately, setting the hash seed is broken in r44371; only fixed in
r44718, where I can't get this bug to manifest. To get a parrot on which
you can reliably reproduce this bug, you'll have to checkout r44371 and
then merge the patch 44717:44718. Running this, I got the following
results:
{{{
# fails to reproduce bug (0/20 runs)
> parrot --hash-seed F00F perl6.pbc t/spec/S32-trig/sinh.t
# probe for seeds that trigger this bug
> parrot --hash-seed $(perl -e "printf qq{%x\n}, scalar time" | tee seed)
perl6.pbc t/spec/S32-trig/sinh.t
> cat seed
# consistently reproduces bug (8/8 runs)
> parrot --hash-seed 4b93fa3a perl6.pbc t/spec/S32-trig/sinh.t
}}}
--
Ticket URL: <https://trac.parrot.org/parrot/ticket/1499#comment:9>
Parrot <https://trac.parrot.org/parrot/>
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