This looks like a stack overflow.  Apparently, the upstream developers don’t in 
general consider stack overflows to be a bug:
<http://bugs.exim.org/show_bug.cgi?id=797>

The crash can be avoided by configuring pcre with --disable-stack-for-
recursion.  However, the documentation says that “PCRE runs noticeably
more slowly when built in this way”.

-- 
Segfault on pcregrep -M '(.|\n)*' /dev/zero
https://bugs.launchpad.net/bugs/329243
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