Dmitry Shulga 0cb2cc959e MDEV-40004: Server crashes in sp_head::register_instr_mem_root_for_deallocation upon shutdown ...

n shutdown server could crash in case triggers executed during server run
and some of triggers instructions were re-compiled.

The crash is caused by attempt to allocate a memory for storing pointers
on mem_roots used for memory allocation taken place on re-parsing failing
trigger's statements. The reason of crash is dereferencing of nullptr
returning by the function current_thd().

To fix the issue, use dummy THD on shutdown the table definition cache.
tdc_start_shutdown() is solely invoked from the function clean_up()
but the later is called from many places around the source code, not only
from mysql_main(), particularly clean_up() is called from unireg_abort().
Therefore, the extra argument added into the signature of the function
cleanup() to allow explicit request of use dummy THD on shutdown the table
definition cache.

2026-06-18 16:14:40 +07:00

4.1 KiB

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