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Fix a very rare crash in GHCi
author
Simon Marlow
<marlowsd@gmail.com>
Tue, 5 Oct 2010 14:47:35 +0000
(14:47 +0000)
committer
Simon Marlow
<marlowsd@gmail.com>
Tue, 5 Oct 2010 14:47:35 +0000
(14:47 +0000)
When a BCO with a zero-length bitmap was right at the edge of
allocated memory, we were reading a word of non-existent memory.
This showed up as a segfault in T789(ghci) for me, but the crash was
extremely sensitive and went away with most changes.
Also, optimised scavenge_large_bitmap a bit while I was in there.
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