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MDEV-7793 - Race condition between XA COMMIT/ROLLBACK and disconnect

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XA COMMIT/ROLLBACK of XA transaction owned by different thread may access
freed memory if that thread disconnects at the same time.

Also concurrent XA COMMIT/ROLLBACK of recovered XA transaction were not
serialized properly.
This commit is contained in:
Sergey Vojtovich
2015-03-17 19:49:04 +04:00
parent b975685036
commit 7ed673f35c
6 changed files with 136 additions and 53 deletions
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sql/sql_class.h
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@ -1137,7 +1137,6 @@ typedef struct st_xid_state {
/* For now, this is only used to catch duplicated external xids */
XID xid; // transaction identifier
enum xa_states xa_state; // used by external XA only
bool in_thd;
/* Error reported by the Resource Manager (RM) to the Transaction Manager. */
uint rm_error;
XID_cache_element *xid_cache_element;