mysqld freeze at 100% load

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As soon as mysqld starts it goes 100% cpu. I can stop it, there is no
mysql_safe running, and I ran
mysqlcheck -A -a -c -o -g --auto-repair -u root -p
all is ok, syslog shows nothing important but I can't login to any account
with
mysql client it just sits there, using php it times out.
I don't know how to fix the urgent situation...

>How-To-Repeat:

Looks like it has been started after a release update.
I don't know if this bug is related since is mysql_safe
https://bugs.launchpad.net/ubuntu/+source/mysql-dfsg-5.0/+bu g/105457/

>Fix:
I don't know

>Submitter-Id:
>Originator: root
>Organization:

>MySQL support: [none | licence | email support | extended email support ]
>Synopsis:
>Severity: <[ non-critical | serious | critical ] (one line)>
>Priority: <[ low | medium | high ] (one line)>
>Category: mysql
>Class: <[ sw-bug | doc-bug | change-request | support ] (one line)>
>Release: mysql-5.1.41-3ubuntu12.6 ((Ubuntu))
>C compiler: gcc-4.4.real (Ubuntu 4.4.3-4ubuntu5) 4.4.3
>C++ compiler: g++-4.4.real (Ubuntu 4.4.3-4ubuntu5) 4.4.3
>Environment:

System: Linux mail.campiaperti.org 2.6.32.16-linode28 #1 SMP Sun Jul 25
21:32:42 UTC 2010 i686 GNU/Linux
Some paths: /usr/bin/perl /usr/bin/make /usr/bin/gcc /usr/bin/cc
GCC: Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
4.4.3-4ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.4/R
Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
Compilation info (call): CC='gcc' CFLAGS='-O3 -DBIG_JOINS=1
-fno-strict-aliasing' CXX='g++' CXXFLAGS='-O3 -DBIG_JOINS=1


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