3.3.1

This version fixes bugs that are typically encountered only when utilizing custom run-time options.

Bug fixes:

• Fix a locking order bug that could cause deadlock during fork if heap
  profiling were enabled.
• Fix a chunk recycling bug that could cause the allocator to lose track of
  whether a chunk was zeroed. On FreeBSD, NetBSD, and OS X, it could cause
  corruption if allocating via sbrk(2) (unlikely unless running with the
  "dss:primary" option specified). This was completely harmless on Linux
  unless using mlockall(2) (and unlikely even then, unless the
  --disable-munmap configure option or the "dss:primary" option was
  specified). This regression was introduced in 3.1.0 by the
  mlockall(2)/madvise(2) interaction fix.
• Fix TLS-related memory corruption that could occur during thread exit if the
  thread never allocated memory. Only the quarantine and prof facilities were
  susceptible.
• Fix two quarantine bugs:
  • Internal reallocation of the quarantined object array leaked the old
    array.
  • Reallocation failure for internal reallocation of the quarantined object
    array (very unlikely) resulted in memory corruption.
• Fix Valgrind integration to annotate all internally allocated memory in a
  way that keeps Valgrind happy about internal data structure access.
• Fix building for s390 systems.