mupdate thread died with SIGSEGV

[João Assad]

This doesnt seem to be related to the mmap problem

The only errors I got on cyrus log when it happened were a bunch of this:

Apr 10 16:35:03 cyrus-fe1 cyrus/lmtp[30983]: mupdate-client: 
connect(10.1.5.101): Connection timed out

This time I have strace and gdb logs. Im sending attached the last 1000 
lines of the mupdate process strace, the last 1000 of the mupdate thread 
strace and the gdb trace I managed to extract from the core dump.

Note that strace was configured to not log futex calls.
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