Based on the stack trace sname from the field metadata is NULL, but I don't immediately see how that could happen.

I'd just like to say that I cannot reproduce this. I have absolutely no idea what kind of conditions led to this dump. Maybe some more information could help diagnose it. MySQL version? Source code that was executed at the time of this error.

It is important to provide specific details and a clear reproduction steps when reporting a bug. A simpler test case can help others better understand the issue and assist in resolving it. Additionally, it can be helpful to know if the bug is specific to a particular platform or if it can be replicated on different systems. Saying "me too" does not add any additional information and can clutter the database, but it is important to vote on the bug to indicate its importance and help prioritize its resolution.

(https://www.marykayintouch.website/)php.net

(https://www.linkedin.com/pulse/augusta-precious-metals-review-best-gold-ira-company-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/goldco-review-gold-ira-rollover-precious-metal-company-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/how-apply-employee-retention-credit-erc-complete-guide-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/best-gold-ira-companies-investment-retirement-accounts-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/ira-allowable-precious-metals-best-ira-approved-metal-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/roth-gold-ira-account-best-companies-how-works-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/what-employee-retention-tax-credit-ertc-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/best-precious-metals-ira-2023-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/best-silver-ira-companies-2023-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/how-protect-your-401k-from-market-crash-recession-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/goldco-vs-augusta-precious-metals-which-best-gold-ira-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/how-move-401k-gold-ira-without-penalty-jeffrey-keever/)github.com 
(https://www.linkedin.com/pulse/how-buy-physical-gold-your-401k-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/noble-gold-investments-review-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/best-paying-jobs-precious-metals-jeffrey-keever/)github.com
(https://www.linkedin.com/pulse/how-buy-gold-ira-jeffrey-keever-1e/)github.com

I have the same exact issue. Happened on one of our customers application. It constantly crashing (segfaulted).

---------
coredumpctl debug

Reading symbols from /usr/sbin/php-fpm8.0...
Reading symbols from /usr/lib/debug/.build-id/08/9da7e5338bcab54ba9be4e31fd5c069bc3a308.debug...
[New LWP 1739784]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `php-fpm: pool www                                                            '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  zend_string_copy (s=0x0) at ./Zend/zend_types.h:628
628     ./Zend/zend_types.h: No such file or directory.
(gdb) backtrace
#0  zend_string_copy (s=0x0) at ./Zend/zend_types.h:628
#1  pdo_mysql_stmt_describe (stmt=0x7f7dc0b96f00, colno=<optimized out>) at ./ext/pdo_mysql/mysql_statement.c:637
#2  0x00007f7dc4e9458d in ?? () from /usr/lib/php/20200930/pdo.so
#3  0x00007f7dc4e94a3a in ?? () from /usr/lib/php/20200930/pdo.so
#4  0x000055cf3ea5f9a5 in ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER () at ./Zend/zend_vm_execute.h:1755
#5  execute_ex (ex=0x7f7dc0b96f00) at ./Zend/zend_vm_execute.h:55191
#6  0x000055cf3ea6154d in zend_execute (op_array=0x7f7dc4c66000, return_value=0x0) at ./Zend/zend_vm_execute.h:59523
#7  0x000055cf3e9f5c7d in zend_execute_scripts (type=-993961904, type@entry=8, retval=retval@entry=0x0, file_count=file_count@entry=3) at ./Zend/zend.c:1694
#8  0x000055cf3e992a0a in php_execute_script (primary_file=<optimized out>) at ./main/main.c:2546
#9  0x000055cf3e84675d in main (argc=<optimized out>, argv=<optimized out>) at ./sapi/fpm/fpm/fpm_main.c:1914
---------

---------
dmesg

php-fpm8.0[1739331]: segfault at 4 ip 00007f7dc20122d3 sp 00007ffc82aa0da0 error 4 in pdo_mysql.so[7f7dc200f000+4000]
Code: 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 44 00 00 85 d2 7e e3 45 31 ed 4c 8d 35 ba 13 00 00 eb 4a 48 8b 00 <f6> 40 04 40 75 03 83 00 01 48 89 03 48 8b 45 10 42 8b 84 20 80 00
---------


Stack we use:
- ProxySQL version 2.1.1-40-g1c2b7e4, codename Truls
- MariaDB 10.5.10-MariaDB-1:10.5.10+maria~focal-log