Might be a perl bug or a compiler (prerelease gcc) bug.

You can try disabling malloc consistency checks in the environment: 

$ export MALLOC_CHECK_=0
That won't fix any bugs, however. The checks are there for a good reason.

I'd suggest installing a stable compiler (say, gcc-4.8.4) and recompiling your perl from source.

In reply to Re: realloc(): invalid pointer by Anonymous Monk
in thread realloc(): invalid pointer by ChrisDennis

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