The gdb from some of the processes are:
--------
[root@prd-web2887652808b bin]# gdb httpd 23668
GNU gdb (GDB) Red Hat Enterprise Linux 8.0.1-30.amzn2.0.3
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <
http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<
http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<
http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from httpd...Reading symbols from /usr/lib/debug/usr/sbin/httpd.debug...done.
done.
Attaching to program: /usr/sbin/httpd, process 23668
Reading symbols from target:/lib64/libpcre.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libpcre.so.1.2.0.debug...done.
done.
Reading symbols from target:/lib64/libselinux.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libselinux.so.1.debug...done.
done.
Reading symbols from target:/lib64/libaprutil-1.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libaprutil-1.so.0.6.1.debug...done.
done.
Reading symbols from target:/lib64/libcrypt.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libcrypt-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libexpat.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libexpat.so.1.6.0.debug...done.
done.
Reading symbols from target:/lib64/libapr-1.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libapr-1.so.0.6.3.debug...done.
done.
Reading symbols from target:/lib64/libpthread.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libpthread-2.26.so.debug...done.
done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Reading symbols from target:/lib64/libdl.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libdl-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libc.so.6...Reading symbols from /usr/lib/debug/usr/lib64/libc-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/usr/lib64/ld-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libuuid.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libuuid.so.1.3.0.debug...done.
done.
Reading symbols from target:/lib64/librt.so.1...Reading symbols from /usr/lib/debug/usr/lib64/librt-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libnss_sss.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libnss_sss.so.2.debug...done.
done.
Reading symbols from target:/lib64/libnss_files.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libnss_files-2.26.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_access_compat.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_access_compat.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_actions.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_actions.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_alias.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_alias.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_allowmethods.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_allowmethods.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_authn_core.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_authn_core.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_authz_core.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_authz_core.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_authz_host.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_authz_host.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_deflate.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_deflate.so.debug...done.
done.
Reading symbols from target:/lib64/libz.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libz.so.1.2.7.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_dir.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_dir.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_dumpio.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_dumpio.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_env.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_env.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_expires.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_expires.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_filter.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_filter.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_headers.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_headers.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_include.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_include.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_log_config.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_log_config.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_logio.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_logio.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_mime_magic.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_mime_magic.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_mime.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_mime.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_negotiation.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_negotiation.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_remoteip.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_remoteip.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_reqtimeout.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_reqtimeout.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_request.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_request.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_rewrite.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_rewrite.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_setenvif.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_setenvif.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_slotmem_shm.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_slotmem_shm.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_socache_shmcb.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_socache_shmcb.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_substitute.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_substitute.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_unixd.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_unixd.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_vhost_alias.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_vhost_alias.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_watchdog.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_watchdog.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_mpm_worker.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_mpm_worker.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy_connect.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy_connect.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy_express.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy_express.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy_http.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy_http.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_systemd.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_systemd.so.debug...done.
done.
Reading symbols from target:/lib64/libsystemd.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libsystemd.so.0.6.0.debug...done.
done.
Reading symbols from target:/lib64/libcap.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libcap.so.2.22.debug...done.
done.
Reading symbols from target:/lib64/libm.so.6...Reading symbols from /usr/lib/debug/usr/lib64/libm-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/liblzma.so.5...Reading symbols from /usr/lib/debug/usr/lib64/liblzma.so.5.2.2.debug...done.
done.
Reading symbols from target:/lib64/liblz4.so.1...Reading symbols from /usr/lib/debug/usr/lib64/liblz4.so.1.7.5.debug...done.
done.
Reading symbols from target:/lib64/libgcrypt.so.11...Reading symbols from /usr/lib/debug/usr/lib64/libgcrypt.so.11.8.2.debug...done.
done.
Reading symbols from target:/lib64/libgpg-error.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libgpg-error.so.0.10.0.debug...done.
done.
Reading symbols from target:/lib64/libresolv.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libresolv-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libdw.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libdw-0.176.so.debug...done.
done.
Reading symbols from target:/lib64/libgcc_s.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libgcc_s-7-20180712.so.1.debug...done.
done.
Reading symbols from target:/lib64/libattr.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libattr.so.1.1.0.debug...done.
done.
Reading symbols from target:/lib64/libelf.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libelf-0.176.so.debug...done.
done.
Reading symbols from target:/lib64/libbz2.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libbz2.so.1.0.6.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_http2.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_http2.so.debug...done.
done.
Reading symbols from target:/lib64/libnghttp2.so.14...Reading symbols from /usr/lib/debug/usr/lib64/libnghttp2.so.14.20.0.debug...done.
done.
Reading symbols from target:/lib64/libcrypto.so.10...Reading symbols from /usr/lib/debug/usr/lib64/libcrypto.so.1.0.2k.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy_http2.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy_http2.so.debug...done.
done.
get_next (slot=0x5591071acd18) at h2_workers.c:195
195 status = h2_fifo_try_peek(workers->mplxs, mplx_peek, slot);
(gdb) where
#0 get_next (slot=0x5591071acd18) at h2_workers.c:195
#1 slot_run (thread=0x5591072441e0, wctx=0x5591071acd18) at h2_workers.c:228
#2 0x00007fcf0690640b in start_thread (arg=0x7fced6bf5700) at pthread_create.c:465
#3 0x00007fcf0643d09f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
--------
[root@prd-web2887652808b bin]# gdb httpd 23660
GNU gdb (GDB) Red Hat Enterprise Linux 8.0.1-30.amzn2.0.3
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <
http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<
http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<
http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from httpd...Reading symbols from /usr/lib/debug/usr/sbin/httpd.debug...done.
done.
Attaching to program: /usr/sbin/httpd, process 23660
Reading symbols from target:/lib64/libpcre.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libpcre.so.1.2.0.debug...done.
done.
Reading symbols from target:/lib64/libselinux.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libselinux.so.1.debug...done.
done.
Reading symbols from target:/lib64/libaprutil-1.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libaprutil-1.so.0.6.1.debug...done.
done.
Reading symbols from target:/lib64/libcrypt.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libcrypt-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libexpat.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libexpat.so.1.6.0.debug...done.
done.
Reading symbols from target:/lib64/libapr-1.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libapr-1.so.0.6.3.debug...done.
done.
Reading symbols from target:/lib64/libpthread.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libpthread-2.26.so.debug...done.
done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Reading symbols from target:/lib64/libdl.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libdl-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libc.so.6...Reading symbols from /usr/lib/debug/usr/lib64/libc-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/usr/lib64/ld-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libuuid.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libuuid.so.1.3.0.debug...done.
done.
Reading symbols from target:/lib64/librt.so.1...Reading symbols from /usr/lib/debug/usr/lib64/librt-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libnss_sss.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libnss_sss.so.2.debug...done.
done.
Reading symbols from target:/lib64/libnss_files.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libnss_files-2.26.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_access_compat.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_access_compat.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_actions.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_actions.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_alias.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_alias.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_allowmethods.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_allowmethods.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_authn_core.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_authn_core.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_authz_core.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_authz_core.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_authz_host.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_authz_host.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_deflate.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_deflate.so.debug...done.
done.
Reading symbols from target:/lib64/libz.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libz.so.1.2.7.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_dir.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_dir.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_dumpio.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_dumpio.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_env.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_env.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_expires.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_expires.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_filter.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_filter.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_headers.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_headers.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_include.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_include.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_log_config.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_log_config.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_logio.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_logio.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_mime_magic.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_mime_magic.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_mime.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_mime.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_negotiation.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_negotiation.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_remoteip.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_remoteip.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_reqtimeout.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_reqtimeout.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_request.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_request.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_rewrite.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_rewrite.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_setenvif.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_setenvif.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_slotmem_shm.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_slotmem_shm.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_socache_shmcb.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_socache_shmcb.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_substitute.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_substitute.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_unixd.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_unixd.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_vhost_alias.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_vhost_alias.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_watchdog.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_watchdog.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_mpm_worker.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_mpm_worker.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy_connect.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy_connect.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy_express.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy_express.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy_http.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy_http.so.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_systemd.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_systemd.so.debug...done.
done.
Reading symbols from target:/lib64/libsystemd.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libsystemd.so.0.6.0.debug...done.
done.
Reading symbols from target:/lib64/libcap.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libcap.so.2.22.debug...done.
done.
Reading symbols from target:/lib64/libm.so.6...Reading symbols from /usr/lib/debug/usr/lib64/libm-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/liblzma.so.5...Reading symbols from /usr/lib/debug/usr/lib64/liblzma.so.5.2.2.debug...done.
done.
Reading symbols from target:/lib64/liblz4.so.1...Reading symbols from /usr/lib/debug/usr/lib64/liblz4.so.1.7.5.debug...done.
done.
Reading symbols from target:/lib64/libgcrypt.so.11...Reading symbols from /usr/lib/debug/usr/lib64/libgcrypt.so.11.8.2.debug...done.
done.
Reading symbols from target:/lib64/libgpg-error.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libgpg-error.so.0.10.0.debug...done.
done.
Reading symbols from target:/lib64/libresolv.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libresolv-2.26.so.debug...done.
done.
Reading symbols from target:/lib64/libdw.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libdw-0.176.so.debug...done.
done.
Reading symbols from target:/lib64/libgcc_s.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libgcc_s-7-20180712.so.1.debug...done.
done.
Reading symbols from target:/lib64/libattr.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libattr.so.1.1.0.debug...done.
done.
Reading symbols from target:/lib64/libelf.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libelf-0.176.so.debug...done.
done.
Reading symbols from target:/lib64/libbz2.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libbz2.so.1.0.6.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_http2.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_http2.so.debug...done.
done.
Reading symbols from target:/lib64/libnghttp2.so.14...Reading symbols from /usr/lib/debug/usr/lib64/libnghttp2.so.14.20.0.debug...done.
done.
Reading symbols from target:/lib64/libcrypto.so.10...Reading symbols from /usr/lib/debug/usr/lib64/libcrypto.so.1.0.2k.debug...done.
done.
Reading symbols from target:/etc/httpd/modules/mod_proxy_http2.so...Reading symbols from /usr/lib/debug/usr/lib64/httpd/modules/mod_proxy_http2.so.debug...done.
done.
get_next (slot=0x5591071acd98) at h2_workers.c:196
196 if (status == APR_EOF) {
(gdb) where
#0 get_next (slot=0x5591071acd98) at h2_workers.c:196
#1 slot_run (thread=0x559107244030, wctx=0x5591071acd98) at h2_workers.c:228
#2 0x00007fcf0690640b in start_thread (arg=0x7fced7bf7700) at pthread_create.c:465
#3 0x00007fcf0643d09f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
---------
fifo_peek (block=0, ctx=ctx@entry=0x5591071acf58, fn=fn@entry=0x7fceff358fd0 <mplx_peek>, fifo=0x5591071ac7a0) at h2_util.c:767
767 return APR_EOF;
(gdb) where
#0 fifo_peek (block=0, ctx=ctx@entry=0x5591071acf58, fn=fn@entry=0x7fceff358fd0 <mplx_peek>, fifo=0x5591071ac7a0) at h2_util.c:767
#1 h2_fifo_try_peek (fifo=0x5591071ac7a0, fn=fn@entry=0x7fceff358fd0 <mplx_peek>, ctx=ctx@entry=0x5591071acf58) at h2_util.c:792
#2 0x00007fceff358e3d in get_next (slot=0x5591071acf58) at h2_workers.c:195
#3 slot_run (thread=0x559107243a48, wctx=0x5591071acf58) at h2_workers.c:228
#4 0x00007fcf0690640b in start_thread (arg=0x7fcedb3fe700) at pthread_create.c:465
#5 0x00007fcf0643d09f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
-----------
slot_run (thread=0x559107243da8, wctx=0x5591071ace58) at h2_workers.c:225
225 while (!slot->aborted) {
(gdb) where
#0 slot_run (thread=0x559107243da8, wctx=0x5591071ace58) at h2_workers.c:225
#1 0x00007fcf0690640b in start_thread (arg=0x7fced93fa700) at pthread_create.c:465
#2 0x00007fcf0643d09f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
------------
I also ran gdb on the parent process:
Attaching to program: /usr/sbin/httpd, process 22231
[New LWP 23620]
[New LWP 23636]
[New LWP 23648]
[New LWP 23660]
[New LWP 23664]
[New LWP 23668]
[New LWP 23677]
[New LWP 23698]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007fcf0690bd63 in futex_wait (private=<optimized out>, expected=12, futex_word=0x5591072435e4) at ../sysdeps/unix/sysv/linux/futex-internal.h:61
61 int err = lll_futex_timed_wait (futex_word, expected, NULL, private);
(gdb) where
#0 0x00007fcf0690bd63 in futex_wait (private=<optimized out>, expected=12, futex_word=0x5591072435e4) at ../sysdeps/unix/sysv/linux/futex-internal.h:61
#1 futex_wait_simple (private=<optimized out>, expected=12, futex_word=0x5591072435e4) at ../sysdeps/nptl/futex-internal.h:135
#2 __pthread_cond_destroy (cond=0x5591072435c0) at pthread_cond_destroy.c:54
#3 0x00007fcf06b3bcee in run_cleanups (cref=<optimized out>) at memory/unix/apr_pools.c:2629
#4 apr_pool_destroy (pool=0x5591071ac6b8) at memory/unix/apr_pools.c:1000
#5 0x00007fcf06b3bccd in apr_pool_destroy (pool=0x55910711a918) at memory/unix/apr_pools.c:997
#6 0x00007fcf01e86e55 in clean_child_exit (code=0) at worker.c:436
#7 0x00007fcf01e8795e in child_main (child_num_arg=child_num_arg@entry=5, child_bucket=child_bucket@entry=0) at worker.c:1197
#8 0x00007fcf01e87ffb in make_child (s=0x559107069650, slot=slot@entry=5, bucket=0) at worker.c:1328
#9 0x00007fcf01e8806d in startup_children (number_to_start=16, number_to_start@entry=20) at worker.c:1355
#10 0x00007fcf01e88c03 in server_main_loop (num_buckets=1, remaining_children_to_start=20) at worker.c:1669
#11 worker_run (_pconf=<optimized out>, plog=<optimized out>, s=<optimized out>) at worker.c:1761
#12 0x0000559105d346da in ap_run_mpm (pconf=0x5591070403a8, plog=0x55910706d5c8, s=0x559107069650) at mpm_common.c:94
#13 0x0000559105d2d01c in main (argc=<optimized out>, argv=<optimized out>) at main.c:819
