PHP 8.0.20 (ZTS) zend_signal_handler_defer crashes on apache

[gavgavych]

Description

PHP (zts) and Apache build:

httpd -V
Server version: Apache/2.4.54 (Unix)
Server built:   Jun 14 2022 17:15:53
Server's Module Magic Number: 20120211:124
Server loaded:  APR 1.7.0, APR-UTIL 1.6.1, PCRE 8.39 2016-06-14
Compiled using: APR 1.7.0, APR-UTIL 1.6.1, PCRE 8.39 2016-06-14
Architecture:   64-bit
Server MPM:     event
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)

php --version
PHP 8.0.20 (cli) (built: Jun 14 2022 17:24:49) ( ZTS )
Copyright (c) The PHP Group
Zend Engine v4.0.20, Copyright (c) Zend Technologies
    with Zend OPcache v8.0.20, Copyright (c), by Zend Technologies
    with SourceGuardian v13.0.2, Copyright (c) 2000-2022, by SourceGuardian Ltd.

The following code:

info.php:

<?php

phpinfo();

$: wrk -t 3 -c 3 -d 20 "http://localhost/info.php"

Resulted in this output:

gdb:

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f1f4a448da4 in zend_signal_handler_defer (signo=1, siginfo=0x7f1f0f7cd830, context=0x7f1f0f7cd700) at /php/Zend/zend_signal.c:96
96    /php/Zend/zend_signal.c: No such file or directory.
[Current thread is 1 (Thread 0x7f1f0f7ce700 (LWP 7751))]
(gdb) bt
#0  0x00007f1f4a448da4 in zend_signal_handler_defer (signo=1, siginfo=0x7f1f0f7cd830, context=0x7f1f0f7cd700) at /php/Zend/zend_signal.c:96
#1  <signal handler called>
#2  __pthread_kill (threadid=<optimized out>, signo=1) at ../sysdeps/unix/sysv/linux/pthread_kill.c:56
#3  0x00007f1f4acab4e2 in wakeup_listener () from /opt/server/lib/webmanager/mod_mpm_event.so
#4  0x00007f1f4acab51c in signal_threads () from /opt/server/lib/webmanager/mod_mpm_event.so
#5  0x00007f1f4acad4d0 in check_infinite_requests () from /opt/server/lib/webmanager/mod_mpm_event.so
#6  0x00007f1f4acae541 in listener_thread () from /opt/server/lib/webmanager/mod_mpm_event.so
#7  0x000055644d671f09 in thread_start ()
#8  0x00007f1f4af44ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f1f4ae74def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Slice: system.slice
Boot ID: 10b358fb6fbd4abfac2ee9b9a6f14cca
Machine ID: ff5db65b2db34c9cbf8de05ba4d322e6
Hostname: debian
Storage: /var/lib/systemd/coredump/core.httpd.998.10b358fb6fbd4abfac2ee9b9a6f14cca.7649.1655302730000000.zst
 Message: Process 7649 (httpd) of user 998 dumped core.                
                Stack trace of thread 7751:
                #0  0x00007f1f4a448da4 zend_signal_handler_defer (libphp.so + 0x406da4)
                #1  0x00007f1f4af50140 __restore_rt (libpthread.so.0 + 0x14140)
                #2  0x00007f1f4af4cf44 __pthread_kill (libpthread.so.0 + 0x10f44)
                #3  0x00007f1f4acab4e2 wakeup_listener (mod_mpm_event.so + 0x54e2)
                #4  0x00007f1f4acab51c signal_threads (mod_mpm_event.so + 0x551c)
                #5  0x00007f1f4acad4d0 check_infinite_requests (mod_mpm_event.so + 0x74d0)
                #6  0x00007f1f4acae541 listener_thread (mod_mpm_event.so + 0x8541)
                #7  0x000055644d671f09 thread_start (httpd + 0x43f09)
                #8  0x00007f1f4af44ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #9  0x00007f1f4ae74def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 7733:
                #0  0x00007f1f4af4b7b2 futex_wait_cancelable (libpthread.so.0 + 0xf7b2)
                #1  0x000055644d6b2b05 ap_queue_pop_something (httpd + 0x84b05)
                #2  0x00007f1f4acb020d worker_thread (mod_mpm_event.so + 0xa20d)
                #3  0x000055644d671f09 thread_start (httpd + 0x43f09)
                #4  0x00007f1f4af44ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007f1f4ae74def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 7649:
                #0  0x00007f1f4af4f08c __libc_read (libpthread.so.0 + 0x1308c)
                #1  0x000055644d6b12cc ap_mpm_podx_check (httpd + 0x832cc)
                #2  0x00007f1f4acb1abf child_main (mod_mpm_event.so + 0xbabf)
                #3  0x00007f1f4acb1ff7 make_child (mod_mpm_event.so + 0xbff7)
                #4  0x00007f1f4acb208e startup_children (mod_mpm_event.so + 0xc08e)
                #5  0x00007f1f4acb3192 server_main_loop (mod_mpm_event.so + 0xd192)
                #6  0x00007f1f4acb357f event_run (mod_mpm_event.so + 0xd57f)
                #7  0x000055644d67344d ap_run_mpm (httpd + 0x4544d)
                #8  0x000055644d669555 main (httpd + 0x3b555)
                #9  0x00007f1f4ad9dd0a __libc_start_main (libc.so.6 + 0x26d0a)
                #10 0x000055644d6675ba _start (httpd + 0x395ba)
                
                Stack trace of thread 7650:
                #0  0x00007f1f4af4b7b2 futex_wait_cancelable (libpthread.so.0 + 0xf7b2)
                #1  0x00007f1f4a799c11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007f1f4a799dd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x000055644d671f09 thread_start (httpd + 0x43f09)
                #4  0x00007f1f4af44ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007f1f4ae74def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 7651:
                #0  0x00007f1f4af4b7b2 futex_wait_cancelable (libpthread.so.0 + 0xf7b2)
                #1  0x00007f1f4a799c11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007f1f4a799dd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x000055644d671f09 thread_start (httpd + 0x43f09)
                #4  0x00007f1f4af44ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007f1f4ae74def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 7652:
                #0  0x00007f1f4af4b7b2 futex_wait_cancelable (libpthread.so.0 + 0xf7b2)
                #1  0x00007f1f4a799c11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007f1f4a799dd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x000055644d671f09 thread_start (httpd + 0x43f09)
                #4  0x00007f1f4af44ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007f1f4ae74def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 7653:
                #0  0x00007f1f4af4b7b2 futex_wait_cancelable (libpthread.so.0 + 0xf7b2)
                #1  0x00007f1f4a799c11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007f1f4a799dd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x000055644d671f09 thread_start (httpd + 0x43f09)
                #4  0x00007f1f4af44ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007f1f4ae74def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 7654:
                #0  0x00007f1f4af4b7b2 futex_wait_cancelable (libpthread.so.0 + 0xf7b2)
                #1  0x00007f1f4a799c11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007f1f4a799dd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x000055644d671f09 thread_start (httpd + 0x43f09)
                #4  0x00007f1f4af44ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007f1f4ae74def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 7655:
                #0  0x00007f1f4af4b7b2 futex_wait_cancelable (libpthread.so.0 + 0xf7b2)
                #1  0x00007f1f4a799c11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007f1f4a799dd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x000055644d671f09 thread_start (httpd + 0x43f09)
                #4  0x00007f1f4af44ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007f1f4ae74def __clone (libc.so.6 + 0xfddef)

PHP Version

PHP 8.0.20

Operating System

Debian 11

[cmb69]

Does that also happen when SourceGuardian is disabled?

[gavgavych]

yes, it's the same segfault

php --version
PHP 8.0.20 (cli) (built: Jun 14 2022 17:24:49) ( ZTS )
Copyright (c) The PHP Group
Zend Engine v4.0.20, Copyright (c) Zend Technologies
    with Zend OPcache v8.0.20, Copyright (c), by Zend Technologies

wrk -t 3 -c 3 -d 20 "http://localhost/info.php"

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f1f4a448da4 in zend_signal_handler_defer (signo=1, siginfo=0x7f1f0f7cd830, context=0x7f1f0f7cd700) at /php/Zend/zend_signal.c:96
96     /php/Zend/zend_signal.c: No such file or directory.
[Current thread is 1 (Thread 0x7f1f0f7ce700 (LWP 8496))]
(gdb) bt
#0  0x00007f1f4a448da4 in zend_signal_handler_defer (signo=1, siginfo=0x7f1f0f7cd830, context=0x7f1f0f7cd700) at /php/Zend/zend_signal.c:96
#1  <signal handler called>
#2  __pthread_kill (threadid=<optimized out>, signo=1) at ../sysdeps/unix/sysv/linux/pthread_kill.c:56
#3  0x00007f1f4acab4e2 in wakeup_listener () from /opt/server/lib/webmanager/mod_mpm_event.so
#4  0x00007f1f4acab51c in signal_threads () from /opt/server/lib/webmanager/mod_mpm_event.so
#5  0x00007f1f4acad4d0 in check_infinite_requests () from /opt/server/lib/webmanager/mod_mpm_event.so
#6  0x00007f1f4acae541 in listener_thread () from /opt/server/lib/webmanager/mod_mpm_event.so
#7  0x000055644d671f09 in thread_start ()
#8  0x00007f1f4af44ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f1f4ae74def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

[gavgavych]

Tested on ArchLinux

Apache from ArchLinux "Extra Repo"

httpd -V
Server version: Apache/2.4.53 (Unix)
Server built:   Mar 15 2022 01:43:41
Server's Module Magic Number: 20120211:124
Server loaded:  APR 1.7.0, APR-UTIL 1.6.1, PCRE 10.40 2022-04-14
Compiled using: APR 1.7.0, APR-UTIL 1.6.1, PCRE 10.39 2021-10-29
Architecture:   64-bit
Server MPM:     event
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)

PHP 8.1.7 (ZTS) from AUR (https://aur.archlinux.org/packages/php-zts)

php --version
PHP 8.1.7 (cli) (built: Jun 15 2022 18:19:58) (ZTS)
Copyright (c) The PHP Group
Zend Engine v4.1.7, Copyright (c) Zend Technologies

With default httpd.conf and php.ini

wrk -t 3 -c 3 -d 20 "http://localhost/info.php"

Hostname: archlinux
       Storage: /var/lib/systemd/coredump/core.httpd.33.6cb5833603d6457894e9a03247f59720.399997.1655332630000000.zst (present)
     Disk Size: 2.2M
       Message: Process 399997 (httpd) of user 33 dumped core.
 Stack trace of thread 400065:
                #0  0x00007f21eee46e49 zend_signal_handler_defer (libphp.so + 0x446e49)
                #1  0x00007f21f163e8e0 n/a (libc.so.6 + 0x3e8e0)
                #2  0x00007f21f1711c9e epoll_wait (libc.so.6 + 0x111c9e)
                #3  0x00007f21f18bc98e n/a (libapr-1.so.0 + 0x2898e)
                #4  0x00007f21f15f8a5a n/a (mod_mpm_event.so + 0xaa5a)
                #5  0x00007f21f168c54d n/a (libc.so.6 + 0x8c54d)
                #6  0x00007f21f1711874 __clone (libc.so.6 + 0x111874)

                Stack trace of thread 400008:
                #0  0x00007f21f1689119 n/a (libc.so.6 + 0x89119)
                #1  0x00007f21f168b920 pthread_cond_wait (libc.so.6 + 0x8b920)
                #2  0x000055e01870413e ap_queue_pop_something (httpd + 0x7313e)
                #3  0x00007f21f15f4add n/a (mod_mpm_event.so + 0x6add)
                #4  0x00007f21f168c54d n/a (libc.so.6 + 0x8c54d)
                #5  0x00007f21f1711874 __clone (libc.so.6 + 0x111874)

                Stack trace of thread 400061:
                #0  0x00007f21f1689119 n/a (libc.so.6 + 0x89119)
                #1  0x00007f21f168b920 pthread_cond_wait (libc.so.6 + 0x8b920)
                #2  0x000055e01870413e ap_queue_pop_something (httpd + 0x7313e)
                #3  0x00007f21f15f4add n/a (mod_mpm_event.so + 0x6add)
                #4  0x00007f21f168c54d n/a (libc.so.6 + 0x8c54d)
                #5  0x00007f21f1711874 __clone (libc.so.6 + 0x111874)

                Stack trace of thread 400039:
                #0  0x00007f21f1689119 n/a (libc.so.6 + 0x89119)
                #1  0x00007f21f168b920 pthread_cond_wait (libc.so.6 + 0x8b920)
                #2  0x000055e01870413e ap_queue_pop_something (httpd + 0x7313e)
                #3  0x00007f21f15f4add n/a (mod_mpm_event.so + 0x6add)
                #4  0x00007f21f168c54d n/a (libc.so.6 + 0x8c54d)
                #5  0x00007f21f1711874 __clone (libc.so.6 + 0x111874)

                Stack trace of thread 400035:
                #0  0x00007f21f1689119 n/a (libc.so.6 + 0x89119)
                #1  0x00007f21f168b920 pthread_cond_wait (libc.so.6 + 0x8b920)
                #2  0x000055e01870413e ap_queue_pop_something (httpd + 0x7313e)
                #3  0x00007f21f15f4add n/a (mod_mpm_event.so + 0x6add)
                #4  0x00007f21f168c54d n/a (libc.so.6 + 0x8c54d)
                #5  0x00007f21f1711874 __clone (libc.so.6 + 0x111874)

[New LWP 400059]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/httpd -k start -DFOREGROUND'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f21eee46e49 in zend_signal_handler_defer (signo=1, siginfo=0x7f2191ffa7f0, context=0x7f2191ffa6c0) at /usr/src/debug/php-8.1.7/Zend/zend_signal.c:96
96              if (EXPECTED(SIGG(active))) {
[Current thread is 1 (Thread 0x7f2191ffb640 (LWP 400065))]
(gdb) bt
#0  0x00007f21eee46e49 in zend_signal_handler_defer (signo=1, siginfo=0x7f2191ffa7f0, context=0x7f2191ffa6c0) at /usr/src/debug/php-8.1.7/Zend/zend_signal.c:96
#1  <signal handler called>
#2  0x00007f21f1711c9e in epoll_wait () from /usr/lib/libc.so.6
#3  0x00007f21f18bc98e in ?? () from /usr/lib/libapr-1.so.0
#4  0x00007f21f15f8a5a in ?? () from /etc/httpd/modules/mod_mpm_event.so
#5  0x00007f21f168c54d in ?? () from /usr/lib/libc.so.6
#6  0x00007f21f1711874 in clone () from /usr/lib/libc.so.6

So, it's just happen with php 8.1 too

[gavgavych]

php 7.4 (ZTS)

php --version
PHP 7.4.30 (cli) (built: Jun 16 2022 13:09:46) ( ZTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.30, Copyright (c), by Zend Technologies

Message: Process 20788 (httpd) of user 998 dumped core.
                
                Stack trace of thread 20890:
                #0  0x00007fc77f4369cb zend_signal_handler_defer (libphp7.so + 0x3829cb)
                #1  0x00007fc78070c140 __restore_rt (libpthread.so.0 + 0x14140)
                #2  0x00007fc780708f44 pthread_kill (libpthread.so.0 + 0x10f44)
                #3  0x0000563c5795bb54 wakeup_listener (httpd + 0x9bb54)
                #4  0x0000563c5795bb8e signal_threads (httpd + 0x9bb8e)
                #5  0x0000563c5795d9c2 check_infinite_requests (httpd + 0x9d9c2)
                #6  0x0000563c5795e99d listener_thread (httpd + 0x9e99d)
                #7  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #8  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #9  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20788:
                #0  0x00007fc78070b08c read (libpthread.so.0 + 0x1308c)
                #1  0x0000563c579434ac ap_mpm_podx_check (httpd + 0x834ac)
                #2  0x0000563c57961c00 child_main (httpd + 0xa1c00)
                #3  0x0000563c579620d9 make_child (httpd + 0xa20d9)
                #4  0x0000563c5796216a startup_children (httpd + 0xa216a)
                #5  0x0000563c5796317f server_main_loop (httpd + 0xa317f)
                #6  0x0000563c57963538 event_run (httpd + 0xa3538)
                #7  0x0000563c5790562d ap_run_mpm (httpd + 0x4562d)
                #8  0x0000563c578fb735 main (httpd + 0x3b735)
                #9  0x00007fc780559d0a __libc_start_main (libc.so.6 + 0x26d0a)
                #10 0x0000563c578f979a _start (httpd + 0x3979a)
                
                Stack trace of thread 20789:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20791:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20790:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20859:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20792:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20793:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20794:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20841:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20842:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20795:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20857:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20797:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20865:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20798:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20796:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20881:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20800:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20799:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20853:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20801:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20802:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20803:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20863:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20804:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20805:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20880:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20806:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20808:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20809:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20864:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20807:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20851:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20811:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20878:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20810:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20812:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20872:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20814:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20813:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20844:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20815:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20869:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20817:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20816:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20886:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20820:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20819:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20888:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20822:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20883:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20818:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20884:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20876:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20823:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20855:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20821:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20824:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20856:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20846:
                #0  0x00007fc780791269 n/a (libpcre.so.3 + 0xc269)
                #1  0x00007fc780791833 pcre_compile2 (libpcre.so.3 + 0xc833)
                #2  0x0000563c57908ca2 ap_regcomp (httpd + 0x48ca2)
                #3  0x0000563c578fe575 ap_pregcomp (httpd + 0x3e575)
                #4  0x00007fc77fea996a cmd_rewriterule (mod_rewrite.so + 0xc96a)
                #5  0x0000563c57931f7c invoke_cmd (httpd + 0x71f7c)
                #6  0x0000563c57933504 ap_walk_config_sub (httpd + 0x73504)
                #7  0x0000563c579335b4 ap_walk_config (httpd + 0x735b4)
                #8  0x0000563c57934ca3 ap_parse_htaccess (httpd + 0x74ca3)
                #9  0x0000563c57924a58 ap_directory_walk (httpd + 0x64a58)
                #10 0x0000563c5791e20d core_map_to_storage (httpd + 0x5e20d)
                #11 0x0000563c579212c4 ap_run_map_to_storage (httpd + 0x612c4)
                #12 0x0000563c579229da ap_process_request_internal (httpd + 0x629da)
                #13 0x0000563c57950bb8 ap_process_async_request (httpd + 0x90bb8)
                #14 0x0000563c5794c382 ap_process_http_async_connection (httpd + 0x8c382)
                #15 0x0000563c5794c57f ap_process_http_connection (httpd + 0x8c57f)
                #16 0x0000563c5793f99e ap_run_process_connection (httpd + 0x7f99e)
                #17 0x0000563c5795d0b4 process_socket (httpd + 0x9d0b4)
                #18 0x0000563c57960601 worker_thread (httpd + 0xa0601)
                #19 0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #20 0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #21 0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20887:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20825:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x00007fc77fefac11 get_next (mod_http2.so + 0x46c11)
                #2  0x00007fc77fefadd2 slot_run (mod_http2.so + 0x46dd2)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)
                
                Stack trace of thread 20885:
                #0  0x00007fc7807077b2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf7b2)
                #1  0x0000563c57944ce5 ap_queue_pop_something (httpd + 0x84ce5)
                #2  0x0000563c57960495 worker_thread (httpd + 0xa0495)
                #3  0x0000563c579040e9 thread_start (httpd + 0x440e9)
                #4  0x00007fc780700ea7 start_thread (libpthread.so.0 + 0x8ea7)
                #5  0x00007fc780630def __clone (libc.so.6 + 0xfddef)

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fc77f4369cb in zend_signal_handler_defer (signo=1, siginfo=0x7fc6c07f7830, context=0x7fc6c07f7700) at /opt/php-7.4.30/Zend/zend_signal.c:96
96      /opt/php-7.4.30/Zend/zend_signal.c: No such file or directory.
[Current thread is 1 (Thread 0x7fc6c07f8700 (LWP 20890))]
(gdb) bt
#0  0x00007fc77f4369cb in zend_signal_handler_defer (signo=1, siginfo=0x7fc6c07f7830, context=0x7fc6c07f7700) at /opt/php-7.4.30/Zend/zend_signal.c:96
#1  <signal handler called>
#2  0x00007fc780708f44 in pthread_kill () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x0000563c5795bb54 in wakeup_listener ()
#4  0x0000563c5795bb8e in signal_threads ()
#5  0x0000563c5795d9c2 in check_infinite_requests ()
#6  0x0000563c5795e99d in listener_thread ()
#7  0x0000563c579040e9 in thread_start ()
#8  0x00007fc780700ea7 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#9  0x00007fc780630def in clone () from /lib/x86_64-linux-gnu/libc.so.6

[gavgavych]

UPD.
PHP (ZTS) 7.2.31 works fine

php --version
PHP 7.2.31 (cli) (built: Dec 16 2021 13:13:52) ( ZTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.2.31, Copyright (c) 1999-2018, by Zend Technologies
    with SourceGuardian v12.1.1, Copyright (c) 2000-2021, by SourceGuardian Ltd.

[gavgavych]

Hi!
Any updates?