060719 15:18:53 [Warning] No argument was provided to --log-bin, and --log-bin-index was not used; so replication may break when this MySQL server acts as a master and has his hostname changed!! Please use '--log-bin=mecgentoo-bin' to avoid this problem.
060719 15:18:54  InnoDB: Started; log sequence number 0 5847526
060719 15:18:54 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.0.22-debug-log'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  Gentoo Linux mysql-5.0.22
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=258048
max_used_connections=1
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 = 92780 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

thd=0x8d9a780
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=0xbe3fdc58, backtrace may not be correct.
Stack range sanity check OK, backtrace follows:
0x8193524
0xb7de48fd
(nil)
0x811d735
0x81d9556
0x81e18ef
0x81e5ffb
0x81e15ed
0x81aa47f
0x820e868
0x820cdd6
0x81a9a05
0x81a825d
0x81a7322
0xb7dde19b
0xb7c4e4ba
New value of fp=(nil) failed sanity check, terminating stack trace!
Please read http://dev.mysql.com/doc/mysql/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 0x8da6ce0 = SELECT typevalue, notes FROM parts
	JOIN producttype ON(producttype.typeid=parts.typeid)
	LEFT JOIN productdata ON(
		(productdata.typeid,productdata.valueid)=
		(parts.typeid,parts.valueid))
	WHERE parts.typeid=?
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.