OLS crashed without stack information

#1
OLS on one server was crashed.

Code:
At [27/May/2024:06:59:10 +0700], web server with pid=1673370 received unexpected signal=11, a core file is created. A new instance of web server will be started automatically!

Please forward the following debug information to bug@litespeedtech.com.
Environment:

Server: LiteSpeed/1.8.1 Open (lsquic 4.0.8, modgzip 1.1, cache 1.65, mod_security 1.4 (with libmodsecurity v3.0.12)) BUILD (built: Thu Mar 28 15:46:53 UTC 2024)
OS: built: Thu Mar 28 15:46:53 UTC 2024
Release: Linux
Version: 4.18.0-513.18.1.lve.2.el8.x86_64
Build: #1 SMP Sat Mar 30 15:36:11 UTC 2024
Machine: x86_64

If the call stack information does not show up here, please compress and forward the core file located in /tmp/lshttpd.
However, there is no core file in /tmp/lshttpd. There is a folder named bak_core, but it's empty too.
I checked in error_log, only bot detection at that timestamp.

Code:
2024-05-27 06:59:05.451461 [WARN] [1673369] [43.134.40.173] bot detected for vhost [N/A], reason: OverConnHardLimit, close connection!
2024-05-27 06:59:05.536221 [WARN] [1673370] [43.134.40.173] bot detected for vhost [N/A], reason: OverConnHardLimit, close connection!
2024-05-27 06:59:13.341115 [WARN] [1715241] [43.134.40.173] bot detected for vhost [N/A], reason: OverConnHardLimit, close connection!
2024-05-27 06:59:13.553869 [WARN] [1715240] [43.134.40.173] bot detected for vhost [N/A], reason: OverConnHardLimit, close connection!
2024-05-27 06:59:19.198629 [WARN] [1715374] [43.134.40.173] bot detected for vhost [N/A], reason: OverConnHardLimit, close connection!
2024-05-27 06:59:19.344063 [WARN] [1715373] [43.134.40.173] bot detected for vhost [N/A], reason: OverConnHardLimit, close connection!
In stderr.log, nothing related either.
Code:
2024-05-27 06:59:12.594447 Cgroups returning success file: /sys/fs/cgroup/systemd/user.slice/user-1001.slice/litespeed-exec.scope/cgroup.procs, pid: 1715248
2024-05-27 06:59:12.597211 Cgroups returning success file: /sys/fs/cgroup/systemd/user.slice/user-1015.slice/litespeed-exec.scope/cgroup.procs, pid: 1715249
2024-05-27 06:59:12.602049 Cgroups returning success file: /sys/fs/cgroup/systemd/user.slice/user-1026.slice/litespeed-exec.scope/cgroup.procs, pid: 1715250
How to find the stack information?
Thanks.
 
#3
In /usr/local/lsws/conf/httpd-cgirlimit.conf, I have cgroups 2 by default which is disabled completely. Have no idea why there is still cgroups logs there.
 
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