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PS-8908: Mysqld crash when user forgets to set debug timeout #5117

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PS-8908: Mysqld crash when user forgets to set debug timeout #5117

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Commits on Sep 5, 2023

  1. PS-8908: Mysqld crash when user forgets to set debug timeout 

    https://jira.percona.com/browse/PS-8908

Problem:
If 'debug_sync_timeout' parameter is not specified in my.cnf or as
a command line argument, the usage of debug sync factility leads to
the assertion.

Cause:
The default value of 'debug_sync_timeout' is 0, which means the debug
sync factility is disabled. In such a case 'debug_sync_control' member
of the THD is not initialized during THD initialization
(debug_sync_init_thread()).
The callstack debug_sync_set_action => debug_sync_eval_action =>
debug_sync_get_action uses 'debug_sync_control' member unconditionally
causing the assertion.

Solution:
There was a missing check for 'debug_sync_timeout' in
the above-mentioned callstack. Similar checks are present in
debug_sync_update() or debug_sync_init() functions.
Added missing check.
    @kamil-holubicki
    kamil-holubicki committed Sep 5, 2023
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