itpanda2024 created an issue (kamailio/kamailio#4467)

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### Description

<!-- We use db_cluster module with configuration below : loadmodule "db_mysql.so" modparam("db_mysql", "timeout_interval", 2) loadmodule "db_cluster.so" modparam("db_mysql", "timeout_interval", 2) modparam("db_cluster", "connection","cfig_db1=>mysql://kamailio:kamailiorw@localhost/kamailio") modparam("db_cluster", "connection","cfig_db2=>mysql://kamailio_user:Kam2025Db@172.20.22.12/kamailio") modparam("db_cluster", "cluster", "cfig_db=>cfig_db1=9s8r;cfig_db2=9s8r") modparam("db_cluster", "inactive_interval", 180) modparam("db_cluster", "max_query_length", 5)

But we stop db1 . Kamailio fail ,not change to connect db2 and kamailio service stoped. -->

### Troubleshooting

#### Reproduction

<!-- Nov 11 09:43:56 kam-02 kamailio[249517]: 391(249517) INFO: db_cluster [db_cluster_mod.c:192]: dbcl_rpc_list_connections(): read connection [cfig_db2] Nov 11 09:43:56 kam-02 kamailio[249517]: 391(249517) INFO: db_cluster [db_cluster_mod.c:192]: dbcl_rpc_list_connections(): read connection [cfig_db1] Nov 11 09:44:12 kam-02 kamailio[249509]: 387(249509) ERROR: db_mysql [km_dbase.c:129]: db_mysql_submit_query_impl(): driver error on query: Can't connect to local server through socket '/var/lib/mysql/mysql.sock' (2) (2002) Nov 11 09:44:12 kam-02 kamailio[249509]: 387(249509) ERROR: <core> [db_query.c:335]: db_do_delete(): error while submitting query Nov 11 09:44:12 kam-02 kernel: kamailio[249509]: segfault at 0 ip 00007f02cb456312 sp 00007fff12a9a3f0 error 4 in db_cluster.so[12312,7f02cb446000+2f000] likely on CPU 3 (core 0, socket 6) Nov 11 09:44:12 kam-02 kernel: Code: 84 89 c7 e8 c0 fd fe ff 48 8b 4d a0 8b 45 c0 48 63 f0 8b 45 c4 48 63 d0 48 89 d0 48 c1 e0 03 48 29 d0 48 01 f0 48 8b 44 c1 18 <4c> 8b 38 48 8b 4d a0 8b 45 c0 48 63 f0 8b 45 c4 48 63 d0 48 89 d0 Nov 11 09:44:12 kam-02 systemd-coredump[249541]: Process 249509 (kamailio) of user 993 terminated abnormally with signal 11/SEGV, processing... Nov 11 09:44:12 kam-02 systemd[1]: Started systemd-coredump@2-249541-0.service - Process Core Dump (PID 249541/UID 0). Nov 11 09:44:13 kam-02 systemd-coredump[249542]: Process 249509 (kamailio) of user 993 dumped core.#012#012Module libuuid.so.1 from rpm util-linux-2.40.2-10.el10.x86_64#012Module libpcre2-8.so.0 from rpm pcre2-10.44-1.0.1.el10.3.x86_64#012Module libcrypt.so.2 from rpm libxcrypt-4.4.36-10.el10.x86_64#012Module libselinux.so.1 from rpm libselinux-3.8-2.el10_0.x86_64#012Module libbrotlicommon.so.1 from rpm brotli-1.1.0-6.el10.x86_64#012Module libsasl2.so.3 from rpm cyrus-sasl-2.1.28-27.el10.x86_64#012Module libevent-2.1.so.7 from rpm libevent-2.1.12-16.el10.x86_64#012Module libkeyutils.so.1 from rpm keyutils-1.6.3-5.el10.x86_64#012Module libkrb5support.so.0 from rpm krb5-1.21.3-8.0.1.el10_0.x86_64#012Module libcom_err.so.2 from rpm e2fsprogs-1.47.1-3.el10.x86_64#012Module libk5crypto.so.3 from rpm krb5-1.21.3-8.0.1.el10_0.x86_64#012Module libkrb5.so.3 from rpm krb5-1.21.3-8.0.1.el10_0.x86_64#012Module libunistring.so.5 from rpm libunistring-1.1-10.el10.x86_64#012Module libz.so.1 from rpm zlib-ng-2.2.3-1.el10.x86_64#012Module libbrotlidec.so.1 from rpm brotli-1.1.0-6.el10.x86_64#012Module libgssapi_krb5.so.2 from rpm krb5-1.21.3-8.0.1.el10_0.x86_64#012Module libcrypto.so.3 from rpm openssl-3.2.2-16.0.1.el10_0.4.x86_64#012Module libssl.so.3 from rpm openssl-3.2.2-16.0.1.el10_0.4.x86_64#012Module libpsl.so.5 from rpm libpsl-0.21.5-6.el10.x86_64#012Module libssh.so.4 from rpm libssh-0.11.1-4.el10_0.x86_64#012Module libidn2.so.0 from rpm libidn2-2.3.7-3.el10.x86_64#012Module libnghttp2.so.14 from rpm nghttp2-1.64.0-2.el10.x86_64#012Module libcurl.so.4 from rpm curl-8.9.1-5.el10.x86_64#012Module libcap.so.2 from rpm libcap-2.69-7.el10.x86_64#012Module libnss_myhostname.so.2 from rpm systemd-257-9.0.1.el10_0.1.x86_64#012Stack trace of thread 249509:#012#0 0x00007f02cb456312 db_cluster_delete (db_cluster.so + 0x12312)#012#1 0x00007f02cb3b461d tps_db_clean_branches (topos.so + 0x2e61d)#012#2 0x00007f02cb3cae2f tps_storage_clean (topos.so + 0x44e2f)#012#3 0x00000000006dd64f sr_wtimer_exec (/usr/local/sbin/kamailio + 0x2dd64f)#012#4 0x00000000006dc71d fork_sync_timer (/usr/local/sbin/kamailio + 0x2dc71d)#012#5 0x00000000006dd9c3 sr_wtimer_start (/usr/local/sbin/kamailio + 0x2dd9c3)#012#6 0x000000000042eea0 main_loop (/usr/local/sbin/kamailio + 0x2eea0)#012#7 0x000000000043902c main (/usr/local/sbin/kamailio + 0x3902c)#012#8 0x00007f02f04f230e __libc_start_call_main (libc.so.6 + 0x2a30e)#012#9 0x00007f02f04f23c9 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x2a3c9)#012#10 0x000000000041dc65 _start (/usr/local/sbin/kamailio + 0x1dc65)#012ELF object binary architecture: AMD x86-64

-->

#### Debugging Data

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gdb /path/to/kamailio /path/to/corefile bt full info locals list

If you are familiar with gdb, feel free to attach more of what you consider to be relevant.

Module libuuid.so.1 from rpm util-linux-2.40.2-10.el10.x86_64 Module libpcre2-8.so.0 from rpm pcre2-10.44-1.0.1.el10.3.x86_64 Module libcrypt.so.2 from rpm libxcrypt-4.4.36-10.el10.x86_64 Module libselinux.so.1 from rpm libselinux-3.8-2.el10_0.x86_64 Module libbrotlicommon.so.1 from rpm brotli-1.1.0-6.el10.x86_64 Module libsasl2.so.3 from rpm cyrus-sasl-2.1.28-27.el10.x86_64 Module libevent-2.1.so.7 from rpm libevent-2.1.12-16.el10.x86_64 Module libkeyutils.so.1 from rpm keyutils-1.6.3-5.el10.x86_64 Module libkrb5support.so.0 from rpm krb5-1.21.3-8.0.1.el10_0.x86_64 Module libcom_err.so.2 from rpm e2fsprogs-1.47.1-3.el10.x86_64 Module libk5crypto.so.3 from rpm krb5-1.21.3-8.0.1.el10_0.x86_64 Module libkrb5.so.3 from rpm krb5-1.21.3-8.0.1.el10_0.x86_64 Module libunistring.so.5 from rpm libunistring-1.1-10.el10.x86_64 Module libz.so.1 from rpm zlib-ng-2.2.3-1.el10.x86_64 Module libbrotlidec.so.1 from rpm brotli-1.1.0-6.el10.x86_64 Module libgssapi_krb5.so.2 from rpm krb5-1.21.3-8.0.1.el10_0.x86_64 Module libcrypto.so.3 from rpm openssl-3.2.2-16.0.1.el10_0.4.x86_64 Module libssl.so.3 from rpm openssl-3.2.2-16.0.1.el10_0.4.x86_64 Module libpsl.so.5 from rpm libpsl-0.21.5-6.el10.x86_64 Module libssh.so.4 from rpm libssh-0.11.1-4.el10_0.x86_64 Module libidn2.so.0 from rpm libidn2-2.3.7-3.el10.x86_64 Module libnghttp2.so.14 from rpm nghttp2-1.64.0-2.el10.x86_64 Module libcurl.so.4 from rpm curl-8.9.1-5.el10.x86_64 Module libcap.so.2 from rpm libcap-2.69-7.el10.x86_64 Module libnss_myhostname.so.2 from rpm systemd-257-9.0.1.el10_0.1.x86_64 Stack trace of thread 250950: #0 0x00007feac2913312 db_cluster_delete (db_cluster.so + 0x12312) #1 0x00007feac287161d tps_db_clean_branches (topos.so + 0x2e61d) #2 0x00007feac2887e2f tps_storage_clean (topos.so + 0x44e2f) #3 0x00000000006dd64f sr_wtimer_exec (/usr/local/sbin/kamailio + 0x2dd64f) #4 0x00000000006dc71d fork_sync_timer (/usr/local/sbin/kamailio + 0x2dc71d) #5 0x00000000006dd9c3 sr_wtimer_start (/usr/local/sbin/kamailio + 0x2dd9c3) #6 0x000000000042eea0 main_loop (/usr/local/sbin/kamailio + 0x2eea0) #7 0x000000000043902c main (/usr/local/sbin/kamailio + 0x3902c) #8 0x00007feae79ac30e __libc_start_call_main (libc.so.6 + 0x2a30e) #9 0x00007feae79ac3c9 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x2a3c9) #10 0x000000000041dc65 _start (/usr/local/sbin/kamailio + 0x1dc65) ELF object binary architecture: AMD x86-64

-->

``` (paste your debugging data here) ```

#### Log Messages

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``` (paste your log messages here) ```

#### SIP Traffic

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``` (paste your sip traffic here) ```

### Possible Solutions

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### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` (paste your output here) ```

* **Operating System**:

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``` (paste your output here) ```