SUMMARY: AddressSanitizer: heap-use-after-free sql/scheduler.cc:103 in post_kill_notification(THD*)

ASAN failure found during RQG testing on

origin/st-10.6-merge 75fac34247eb600a1dd10f4b4941cce5aac57978

but on other development trees too. So its most probably in main trees.

==3979878==ERROR: AddressSanitizer: heap-use-after-free on address 0x615000094958 at pc 0x55e8eeb554c5 bp 0x7f52353b5ef0 sp 0x7f52353b5ee0

READ of size 8 at 0x615000094958 thread T22

    #0 0x55e8eeb554c4 in post_kill_notification(THD*) /data/Server/st-10.6-merge/sql/scheduler.cc:103

    #1 0x55e8ee65523e in THD::awake_no_mutex(killed_state) /data/Server/st-10.6-merge/sql/sql_class.cc:1916

    #2 0x55e8ee78c3d3 in kill_one_thread(THD*, long long, killed_state, killed_type) /data/Server/st-10.6-merge/sql/sql_parse.cc:9263

    #3 0x55e8ee78cf74 in sql_kill /data/Server/st-10.6-merge/sql/sql_parse.cc:9397

    #4 0x55e8ee776c40 in mysql_execute_command(THD*, bool) /data/Server/st-10.6-merge/sql/sql_parse.cc:5529

    #5 0x55e8ee785fe8 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/Server/st-10.6-merge/sql/sql_parse.cc:8032

    #6 0x55e8ee75ea64 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /data/Server/st-10.6-merge/sql/sql_parse.cc:1896

    #7 0x55e8ee75bfd1 in do_command(THD*, bool) /data/Server/st-10.6-merge/sql/sql_parse.cc:1409

    #8 0x55e8eeb53e35 in do_handle_one_connection(CONNECT*, bool) /data/Server/st-10.6-merge/sql/sql_connect.cc:1416

    #9 0x55e8eeb537bd in handle_one_connection /data/Server/st-10.6-merge/sql/sql_connect.cc:1318

    #10 0x7f52451aa608 in start_thread /build/glibc-eX1tMB/glibc-2.31/nptl/pthread_create.c:477

    #11 0x7f5244d7d292 in __clone (/lib/x86_64-linux-gnu/libc.so.6+0x122292)

Scenario:

Two till three (just for replaying faster) connections run within a loop

    KILL CONNECTION <id of some other connection>;

    if losing the connection because getting killed than just reconnect.