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eedee45885
The reason for the crash was that two tables where updating Aria's TRN->used_instances at the same time. This could happen when a thread started a sub transaction with Aria tables, like reading a stored procedure from the proc table, at the same time another table was clearing the table list after committing a transaction involving Aria tables. The timing window for this to happen is very small, which is why we did not notice this issue for 5 years. The fix was to change reset_thd_trn() to clear the table links directly, instead of calling _ma_reset_trn_for_table() which removed the table from the linked list, which included updating TRN->used_instances. This bug could happen when maria_commit or maria_rollback() where called but not in ha_maria::implicit_commit() which had already a fix for this problem. Other things: - Removed duplicate call to thd_set_ha_data(thd, maria_hton, trn) in ha_maria::implicit_commit() and maria_commit() when TRN is null. |
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