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Bug#11763573 - 56299: MUTEX DEADLOCK WITH COM_BINLOG_DUMP, BINLOG PURGE, AND PROCESSLIST/KILL

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The bug case is similar to one fixed earlier bug_49536.
Deadlock involving LOCK_log appears to be possible because the purge running thread
is holding LOCK_log whereas there is no sense of doing that and which fact was
exploited by the earlier bug fixes.

Fixed with small reengineering of rotate_and_purge(), adding two new methods and
setting up a policy to execute those instead of the former
rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED).
The policy for using rotate(), purge() is that if the caller acquires LOCK_log itself,
it should call rotate(), release the mutex and run purge().

Side effect of this patch is refining error message of bug@11747416 to print
the whole path.
This commit is contained in:
Andrei Elkin
2011-10-27 17:14:41 +03:00
parent 27341322e4
commit a7127418a7
15 changed files with 238 additions and 51 deletions
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3
sql/sql_class.h
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@ -161,9 +161,6 @@ typedef struct st_user_var_events
bool unsigned_flag;
} BINLOG_USER_VAR_EVENT;
#define RP_LOCK_LOG_IS_ALREADY_LOCKED 1
#define RP_FORCE_ROTATE 2
/*
The COPY_INFO structure is used by INSERT/REPLACE code.
The schema of the row counting by the INSERT/INSERT ... ON DUPLICATE KEY