Unexpected Quit cloning to Mac Pro

[flybaby6p2]

i have had similar experience... while trying to backup my mac book pro.
and while searching for any info about this on google, my safari crashed
with similar error message... crashed thread was executing 'pthread_mutex_lock' function...

believe it or not while i was filling out crash report for the crashed safary,
my crash reported crashed! the 'crashed' thread of the crash reported was executing same 'pthread_mutex_lock'!

i am not sure if this has anything to do with it but about 6 hours before this
problem started occuring i upgraded my firmware to EFI Firmware Update 1.2 ( MBP11.0055.B08 )

i still managed to backup my system by creating new account with admin rights... and backing up my drive using that account.