When in send this request from php, phpMyAdmin or mysql-client, mysql server crash and I put the debugtrace found in my mysql.log
SQL query: UPDATE jos_sfc_offremploi SET id_oem = 1 WHERE id_oem = '1'
100801 23:49:43 - 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.
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 338317 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
stack_bottom = 0x7fd2a4180d98 thread_stack 0x40000
/usr/libexec/mysqld(mysql_update(THD*, TABLE_LIST*, List<Item>&, List<Item>&, Item*, unsigned int, st_order*, unsigned long long, enum_duplicates, bool)+0x497) [0x641df7]
/usr/libexec/mysqld(mysql_parse(THD*, char const*, unsigned int, char const**)+0x221) [0x5cb651]
/usr/libexec/mysqld(dispatch_command(enum_server_command, THD*, char*, unsigned int)+0xc9c) [0x5ccbac]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort...
thd->query at 0x7fd28c02af40 is an invalid pointer
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
100801 23:49:44 mysqld_safe Number of processes running now: 0
100801 23:49:44 mysqld_safe mysqld restarted
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
100801 23:49:44 InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
100801 23:49:45 InnoDB: Started; log sequence number 0 491822474
100801 23:49:45 [Note] Event Scheduler: Loaded 0 events
100801 23:49:45 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.1.48' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
It's really impossible to do anything with such a vague bug report. UPDATEs in general certainly don't crash mysql (else nobody would use it), so you need to provide enough information for somebody else to reproduce the problem and/or figure out what's special about this particular UPDATE. The mysql manual page linked from the crash printout is a good place to start trying to diagnose problems.
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