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on shutdown it might happen that
1. the server starts killing THDs
2. it sets thd->killed in srv_purge_coordinator
3. srv_purge_coordinator notices that and tells srv_workers to exit
4. srv_worker will notice that and will start exiting,
... assert here ...
5. server sets thd->killed in worker threads
that is, it might happen that the assert is tested before
srv_worker's THD got the kill signal.
this fixes various random crashes (on this assertion) on shutdown
in tests
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| .. | ||
| archive | ||
| blackhole | ||
| cassandra | ||
| connect | ||
| csv | ||
| example | ||
| federated | ||
| federatedx | ||
| heap | ||
| innobase | ||
| maria | ||
| mroonga | ||
| myisam | ||
| myisammrg | ||
| oqgraph | ||
| perfschema | ||
| sequence | ||
| sphinx | ||
| spider | ||
| test_sql_discovery | ||
| tokudb | ||
| xtradb | ||