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Bug#11757464:SERVER CRASH IN RECURSIVE CALL WHEN OOM

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Analysis:
---------

When the server is out of memory, an error is raised
to indicate the same. Handling the error requires
more memory to be allocated which fails, hence the
error handling loops in a recursion and causes the
server to crash.

Fix:
---
a) Prevents pushing the 'out of memory' error condition
to the diagnostic area as it requires memory allocation.
GET DIAGNOSTICS, SHOW WARNINGS and SHOW ERRORS statements
will not show information about this error. However the
'out of memory' error is returned to the client.
b) It sets the ME_FATALERROR flag when 'out of memory' errors
are reported (for places where the flag is not already set).
This flag prevents activation of SP error handlers which also
require memory allocation and therefore are likely to fail.
This commit is contained in:
Nisha Gopalakrishnan
2013-01-15 15:30:26 +05:30
parent f7f21ee732
commit d01b5c392c
12 changed files with 39 additions and 20 deletions
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2
sql/sql_binlog.cc
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@ -107,7 +107,7 @@ void mysql_client_binlog_statement(THD* thd)
rli->relay_log.description_event_for_exec &&
buf))
{
my_error(ER_OUTOFMEMORY, MYF(0), 1); /* needed 1 bytes */
my_error(ER_OUTOFMEMORY, MYF(ME_FATALERROR), 1); /* needed 1 bytes */
goto end;
}