MySQL を 5.0.45 にしたら，こんなエラーでたびたびクラッシュしてるみたいですねぇ．
ひょっとしてこのバージョンは地雷？ 5.0.41 にダウングレードしてみますか......


InnoDB: Warning: a long semaphore wait:
--Thread 485456896 has waited at btr0cur.c line 366 for 242.00 seconds the semaphore:
S-lock on RW-latch at 0xa74dcb4 created in file dict0dict.c line 3706
a writer (thread id 481861120) has reserved it in mode  wait exclusive
number of readers 1, waiters flag 1
Last time read locked in file btr0cur.c line 366
Last time write locked in file btr0cur.c line 359
        (ry
InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
InnoDB: Pending preads 0, pwrites 0

=====================================
071120 21:19:52 INNODB MONITOR OUTPUT
=====================================
        (ry
----------------------------
END OF INNODB MONITOR OUTPUT
============================
InnoDB: ###### Diagnostic info printed to the standard error stream
InnoDB: Error: semaphore wait has lasted > 600 seconds
InnoDB: We intentionally crash the server, because it appears to be hung.
071120 21:29:24InnoDB: Assertion failure in thread 140652032 in file srv0srv.c line 2093
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.0/en/forcing-recovery.html
InnoDB: about forcing recovery.
071120 21:29:24 - 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.