mysqld got signal 11;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help diagnose
the problem, but since we have already crashed, something is definitely wrong
and this may fail.

key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_connections=100
threads_connected=1
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_connections = 80383 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

thd=0x8993128
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
Cannot determine thread, fp=0xbfe7e3c8, backtrace may not be correct.
Stack range sanity check OK, backtrace follows:
0x80732cf
0x82b53a8
0x80ca4b3
0x80ca1f6
0x80c97f7
0x80c9bea
0x80c9bea
0x80c8a6e
0x80c765d
0x80c71ca
0x80b0924
0x8080b97
0x8082f06
0x807e001
0x807d9f3
0x807d018
0x82b2b5c
0x82e848a
New value of fp=(nil) failed sanity check, terminating stack trace!
Please read http://www.mysql.com/doc/en/Using_stack_trace.html and follow instructions on how to resolve the stack trace. Resolved
stack trace is much more helpful in diagnosing the problem, so please do 
resolve it
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort...
thd->query at 0x8994170 = DELETE  FROM op WHERE (  r = 1 AND a IN ( 1, 2    ) AND ( u = 'w'   OR u LIKE 'w/%'   ) )
                   OR (  r = 1 AND a IN (       3 ) AND ( u = 'w/U' OR u LIKE 'w/U/%' ) ) 
                   OR (  r = 1 AND a IN ( 1, 2, 3 ) AND ( u = 'w'                     ) )
thd->thread_id=1
The manual page at http://www.mysql.com/doc/en/Crashing.html contains
information that should help you find out what is causing the crash.
040210 14:13:39  mysqld ended