yugabyte / yugabyte/yugabyte-db
[YSQL] Various of core dumps while running 2.18.5 with yb_pg_terminate_child_backend = true
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Description
Jira Link: [DB-9210](https://yugabyte.atlassian.net/browse/DB-9210)
### Description
During test with running workload:
1. Creates new connections on each operation
2. Random connection got killed
Observed 2 different core dumps in 2 runs:
[core_173520_1701965098_!home!yugabyte!yb-software!yugabyte-2.18.5.0-b86-centos-x86_64!postgres!bin!postgres.backtrace.txt](https://github.com/yugabyte/yugabyte-db/files/13618813/core_173520_1701965098_.home.yugabyte.yb-software.yugabyte-2.18.5.0-b86-centos-x86_64.postgres.bin.postgres.backtrace.txt)
[core_253206_1701960364_!home!yugabyte!yb-software!yugabyte-2.18.5.0-b86-centos-x86_64!postgres!bin!postgres.backtrace.txt](https://github.com/yugabyte/yugabyte-db/files/13618815/core_253206_1701960364_.home.yugabyte.yb-software.yugabyte-2.18.5.0-b86-centos-x86_64.postgres.bin.postgres.backtrace.txt)
Issue is not reproduced in 20h for 2.20 version, but for 2.18.5 it is failed in 20 minutes.
### Issue Type
kind/bug
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[DB-9210]: https://yugabyte.atlassian.net/browse/DB-9210?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ
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