Hi Yann, Just a quick follow up - we've tried removing mod_http2 but still managed to provoke a crash. See the error_log below when stopping/restarting after httpd becomes unresponsive. We need to be a bit more careful removing other modules to make sure they're not used, which is more time consuming - do you think this is still worth doing to address the issue?
If you have any other suggestions let me know. Thanks. Patrick -- # cat /var/log/httpd/error_log *** Error in `/usr/sbin/httpd': corrupted size vs. prev_size: 0x000055a67cc31e7f *** *** Error in `/usr/sbin/httpd': corrupted size vs. prev_size: 0x000055a67cc31e7f *** *** Error in `/usr/sbin/httpd': corrupted size vs. prev_size: 0x000055a67cc31e7f *** *** Error in `/usr/sbin/httpd': corrupted size vs. prev_size: 0x000055a67cc31e7f *** [Mon Oct 18 20:59:48.426225 2021] [core:notice] [pid 31207] AH00052: child pid 32036 exit signal Segmentation fault (11) [Mon Oct 18 20:59:48.426389 2021] [core:notice] [pid 31207] AH00052: child pid 31246 exit signal Segmentation fault (11) [Mon Oct 18 20:59:48.492282 2021] [core:notice] [pid 31207] AH00052: child pid 31253 exit signal Segmentation fault (11) [Mon Oct 18 20:59:48.492312 2021] [core:notice] [pid 31207] AH00052: child pid 32289 exit signal Segmentation fault (11) [Mon Oct 18 20:59:48.492455 2021] [mpm_prefork:notice] [pid 31207] AH00169: caught SIGTERM, shutting down [Mon Oct 18 20:59:48.631928 2021] [suexec:notice] [pid 32620] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Mon Oct 18 20:59:48.662384 2021] [lbmethod_heartbeat:notice] [pid 32626] AH02282: No slotmem from mod_heartmonitor [Mon Oct 18 20:59:48.724408 2021] [mpm_prefork:notice] [pid 32626] AH00163: Apache/2.4.51 (Amazon) OpenSSL/1.0.2k-fips configured -- resuming normal operations [Mon Oct 18 20:59:48.724430 2021] [core:notice] [pid 32626] AH00094: Command line: '/usr/sbin/httpd' [Mon Oct 18 20:59:49.724509 2021] [mpm_prefork:error] [pid 32626] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting *--* *Patrick Verdon | Founder* Web: www.youreko.com Mobile: +44 (0)7809 296438 Skype: patrick_verdon This entire communication is sent on behalf of Youreko Ltd and is strictly confidential to and for the sole use of the intended addressee. Registered in England - 7448349 On Mon, 18 Oct 2021 at 15:05, Patrick Verdon <patrick.ver...@youreko.com> wrote: > Hi Yann, > > Many thanks for the super quick response. We'll try to remove mod_http2 > and other modules as you suggest to see if that helps. I'll get back to you > once we've had a chance to test it. > > Thanks. > > Patrick > > *--* > > *Patrick Verdon | Founder* > Web: www.youreko.com > Mobile: +44 (0)7809 296438 > Skype: patrick_verdon > > This entire communication is sent on behalf of > Youreko Ltd and is strictly confidential to and > for the sole use of the intended addressee. > > Registered in England - 7448349 > > > > On Mon, 18 Oct 2021 at 12:57, Yann Ylavic <ylavic....@gmail.com> wrote: > >> Hi Patrick, >> >> On Mon, Oct 18, 2021 at 11:27 AM Patrick Verdon >> <patrick.ver...@youreko.com> wrote: >> > >> > # cat /var/log/httpd/error_log >> > httpd: misc/apr_reslist.c:161: reslist_cleanup: Assertion `rl->ntotal >> == 0' failed. >> [] >> > *** Error in `/usr/sbin/httpd': corrupted size vs. prev_size: >> 0x0000557f94567e4f *** >> [] >> > httpd: misc/apr_reslist.c:161: reslist_cleanup: Assertion `rl->ntotal >> == 0' failed. >> > [Sun Oct 17 15:53:47.990497 2021] [core:notice] [pid 2620] AH00052: >> child pid 3166 exit signal Aborted (6) >> [] >> > [Sun Oct 17 15:53:47.990781 2021] [core:notice] [pid 2620] AH00052: >> child pid 2741 exit signal Segmentation fault (11) >> > *** Error in `/usr/sbin/httpd': corrupted size vs. prev_size: >> 0x0000557f94567e4f *** >> [] >> > [Sun Oct 17 15:53:48.056599 2021] [core:notice] [pid 2620] AH00052: >> child pid 2727 exit signal Aborted (6) >> > [Sun Oct 17 15:53:48.056667 2021] [mpm_prefork:notice] [pid 2620] >> AH00169: caught SIGTERM, shutting down >> >> The log seems to show a stop then start sequence (which is possibly >> what "service httpd restart" does), anyway the stop crashes children >> processes that at some point have reserved/handled mod_proxy >> connections. >> >> We will discuss whether/how to fix this on the dev@ mailing list, in >> the meantime I'd suggest that: >> >> > [Sun Oct 17 15:53:48.180621 2021] [http2:warn] [pid 3581] AH10034: The >> mpm module (prefork.c) is not supported by mod_http2. The mpm determines >> how things are processed in your server. HTTP/2 has more demands in this >> regard and the currently selected mpm will just not do. This is an advisory >> warning. Your server will continue to work, but the HTTP/2 protocol will be >> inactive. >> >> .. you do not "LoadModule http2_module mod_http2.so" in your MPM >> prefork configuration, because due to its multithreaded nature (unlike >> MPM prefork) mod_http2 implies that mod_proxy will have to >> allocate/handle multiple simultaneous connection to the backend which >> is what is causing the crash here. >> >> > [Sun Oct 17 15:53:48.181146 2021] [lbmethod_heartbeat:notice] [pid >> 3581] AH02282: No slotmem from mod_heartmonitor >> >> Likewise you probably don't need lbmethod_heartbeat and several >> modules in your list, so I'd suggest that you cleanup your LoadModules >> a bit, ideally to the strict minimum needed. >> >> >> Regards; >> Yann. >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org >> For additional commands, e-mail: users-h...@httpd.apache.org >> >>
