Segfaults in malloc() and malloc_consolidate()

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From http://www.gnu.org/s/libc/manual/html_node/Heap-Consistency-Checking.html#Heap-Consistency-Checking:

Another possibility to check for and guard against bugs in the use of
malloc, realloc and free is to set the environment variable
MALLOC_CHECK_. When MALLOC_CHECK_ is set, a special (less efficient)
implementation is used which is designed to be tolerant against simple
errors, such as double calls of free with the same argument, or
overruns of a single byte (off-by-one bugs). Not all such errors can
be protected against, however, and memory leaks can result. If
MALLOC_CHECK_ is set to 0, any detected heap corruption is silently
ignored; if set to 1, a diagnostic is printed on stderr; if set to 2,
abort is called immediately. This can be useful because otherwise a
crash may happen much later, and the true cause for the problem is
then very hard to track down.

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