Bug 1410883
| Summary: | httpd reload causes leak of semaphores | |||
|---|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Sam Wright <sam.wright> | |
| Component: | httpd | Assignee: | Luboš Uhliarik <luhliari> | |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | |
| Severity: | unspecified | Docs Contact: | ||
| Priority: | unspecified | |||
| Version: | 25 | CC: | carl, jkaluza, jorton, luhliari, pahan | |
| Target Milestone: | --- | |||
| Target Release: | --- | |||
| Hardware: | Unspecified | |||
| OS: | Unspecified | |||
| Whiteboard: | ||||
| Fixed In Version: | httpd-2.4.25-3.fc25 httpd-2.4.25-8.fc26 | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | ||
| Clone Of: | ||||
| : | 1527688 (view as bug list) | Environment: | ||
| Last Closed: | 2017-06-09 18:59:06 UTC | Type: | Bug | |
| Regression: | --- | Mount Type: | --- | |
| Documentation: | --- | CRM: | ||
| Verified Versions: | Category: | --- | ||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | ||
| Cloudforms Team: | --- | Target Upstream Version: | ||
| Embargoed: | ||||
After some research, I was able to isolate this down to the proxy hcheck module. Commenting out `LoadModule proxy_hcheck_module modules/mod_proxy_hcheck.so` in `/etc/httpd/conf.modules.d/00-proxy.conf` makes the issue goes away. According to the changelog, that module was first enabled in 2.4.23-1. Thanks for narrowing that down, Carl. It looks like a long-standing bug in mod_watchdog in fact, but it's triggered by loading mod_proxy_hcheck. Commit: http://pkgs.fedoraproject.org/cgit/rpms/httpd/commit/?id=33e6dce94a1cee18d4588342cd842ae53e877ca9 Package: httpd-2.4.25-3.fc26 Build: https://koji.fedoraproject.org/koji/buildinfo?buildID=835366 Package: httpd-2.4.25-3.fc25 Build: https://koji.fedoraproject.org/koji/buildinfo?buildID=835373 Seems to be fixed in -3 if you want to try that. Seems to work for me. httpd-2.4.25-8.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-7ef5411216 httpd-2.4.25-8.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report. |
Description of problem: A service reload of httpd 2.4.25 will leak exactly one semaphore on every reload. Version-Release number of selected component (if applicable): httpd-2.4.23-4.fc25.x86_64 httpd-2.4.25-1.fc25.x86_64 How reproducible: 100% reproducible Steps to Reproduce: 1. Install and start a fresh copy of httpd-2.4.25 2. Count the number of semaphores used (ipcs -s | grep apache | wc -l) 3. Reload httpd a few times (for i in {1..10}; do systemctl reload apache; done) 4. Recount the number of semaphores used (ipcs -s | grep apache | wc -l) Actual results: [sam@fc25 ~] $ ipcs -s |grep apache 0x00000000 163840 apache 600 1 0x00000000 196609 apache 600 1 0x00000000 229378 apache 600 1 0x00000000 262147 apache 600 1 0x00000000 294916 apache 600 1 0x00000000 327685 apache 600 1 [sam@fc25 ~] $ for i in {1..10}; do sudo service httpd reload; done Redirecting to /bin/systemctl reload httpd.service Redirecting to /bin/systemctl reload httpd.service Redirecting to /bin/systemctl reload httpd.service Redirecting to /bin/systemctl reload httpd.service Redirecting to /bin/systemctl reload httpd.service Redirecting to /bin/systemctl reload httpd.service Redirecting to /bin/systemctl reload httpd.service Redirecting to /bin/systemctl reload httpd.service Redirecting to /bin/systemctl reload httpd.service Redirecting to /bin/systemctl reload httpd.service [sam@fc25 ~] $ ipcs -s |grep apache 0x00000000 2129920 apache 600 1 0x00000000 2162689 apache 600 1 0x00000000 2195458 apache 600 1 0x00000000 2228227 apache 600 1 0x00000000 2260996 apache 600 1 0x00000000 327685 apache 600 1 0x00000000 524294 apache 600 1 0x00000000 720903 apache 600 1 0x00000000 917512 apache 600 1 0x00000000 1114121 apache 600 1 0x00000000 1310730 apache 600 1 0x00000000 1507339 apache 600 1 0x00000000 1703948 apache 600 1 0x00000000 1900557 apache 600 1 0x00000000 2097166 apache 600 1 Expected results: Semaphore count after reloads should remain equal. Additional info: A service stop will clean up all the used semaphores.