Race condition in start_query_killer child code can cause parent MySQL connection to close
|Percona XtraBackup||Status tracked in 2.2|
Child process do
1. Set SIGHUP handler to hadle termination request
2. Set InactiveDestroy for parent's MySQL connection
If child signaled to terminate before 1 and 2 happened, parent connection will be shut down.
This bug is forked from https:/