I have the same problem. 
Yesterday I stopped mysqld through the init.d script, which worked, because 
there was no listener active, no socketfile, and init.d/mysql status said: 
Stopped.
But I looked on my server today, and there was still a mysqld_safe process 
taking up 100% cpu. 

strace -p [mysqld_safe pid] endlessly says:
wait4(-1, 0xbff21280, 0, NULL)          = -1 ECHILD (No child processes)
wait4(-1, 0xbff21280, 0, NULL)          = -1 ECHILD (No child processes)
wait4(-1, 0xbff21280, 0, NULL)          = -1 ECHILD (No child processes)
wait4(-1, 0xbff21280, 0, NULL)          = -1 ECHILD (No child processes)
wait4(-1, 0xbff21280, 0, NULL)          = -1 ECHILD (No child processes)
wait4(-1, 0xbff21280, 0, NULL)          = -1 ECHILD (No child processes)

There's no information in mysql.err and mysql.log at all. 
I installed the server yesterday, and made no changes in my.cnf. It's 
completely standard. 

Mysql version is: 5.0.45-1ubuntu3.1

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mysqd_safe high cpu usage
https://bugs.launchpad.net/bugs/105457
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