Bug 1298123

Summary: mod_auth_kerb threading problems
Product: Red Hat Enterprise Linux 6 Reporter: Martin Frodl <mfrodl>
Component: mod_auth_kerbAssignee: Luboš Uhliarik <luhliari>
Status: CLOSED WONTFIX QA Contact: BaseOS QE - Apps <qe-baseos-apps>
Severity: high Docs Contact:
Priority: unspecified    
Version: 6.7CC: ebenes, jorton, jpallich, lmiksik, mschick, msvoboda, omoris, rwilliam, therfert, vjuranek, zmraz
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: 734098 Environment:
Last Closed: 2017-10-17 07:38:14 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Martin Frodl 2016-01-13 10:11:38 UTC 
mod_auth_kerb in conjunction with worker MPM experiences occasional segfaults, possibly related to those as reported in RHEL-5 bug 734098.

Version-Release number of selected component (if applicable):
mod_auth_kerb-5.4-13.el6.i686
httpd-2.2.15-47.el6_7.2.i686

+++ This bug was initially created as a clone of Bug #734098 +++

Description of problem:
mod_auth_kerb doesn't work properly with worker MPM.

There are the following errors in the log (please find whole error_log attached):

[Mon Aug 29 08:23:55 2011] [notice] child pid 12884 exit signal Bus error (7)
[Mon Aug 29 08:23:57 2011] [notice] child pid 12938 exit signal Segmentation fault (11)
[Mon Aug 29 08:24:02 2011] [notice] child pid 12968 exit signal Segmentation fault (11)
[Mon Aug 29 08:24:03 2011] [notice] child pid 12970 exit signal Segmentation fault (11)
*** glibc detected *** /usr/sbin/httpd.worker: double free or corruption (fasttop): 0x00002aaabc000fe0 ***
======= Backtrace: =========
/lib64/libc.so.6[0x2af75241c45f]
/lib64/libc.so.6(cfree+0x4b)[0x2af75241c8bb]
/usr/lib64/libkrb5.so.3[0x2af75378a9e8]
/etc/httpd/modules/mod_auth_kerb.so[0x2af75ab5520e]
/usr/sbin/httpd.worker(ap_run_check_user_id+0x72)[0x2af7504a3652]
/usr/sbin/httpd.worker(ap_process_request_internal+0x237)[0x2af7504a4857]
/usr/sbin/httpd.worker(ap_process_request+0x198)[0x2af7504b6058]
/usr/sbin/httpd.worker[0x2af7504b32a0]
/usr/sbin/httpd.worker(ap_run_process_connection+0x72)[0x2af7504af632]
/usr/sbin/httpd.worker[0x2af7504baaf7]
/lib64/libpthread.so.0[0x2af751f9073d]
/lib64/libc.so.6(clone+0x6d)[0x2af75247e4bd]
======= Memory map: ========


Version-Release number of selected component (if applicable):
mod_auth_kerb-5.1-3.el5
httpd-2.2.3-53.el5


How reproducible:
MPM worker, mod_auth_kerb authentication with "KrbMethodK5Passwd on". 

ab -n 1000 -c 100 -A username:password http://hostname/

Actual results:
Lot of "Failed requests" in the ab's output. Server error_log is full of errors.

If user try to open real page (with images, styles etc.) in browser, it looks broken - lot of images are missing etc.

Expected results:
No failed requests. No errors in the error_log.

Additional info:
It seems to be fixed in upstream since Oct 2 2008:
http://modauthkerb.cvs.sourceforge.net/viewvc/modauthkerb/mod_auth_kerb/src/mod_auth_kerb.c?r1=1.141&r2=1.142
Comment 11 Red Hat Bugzilla Rules Engine 2017-10-17 07:38:14 UTC 
Development Management has reviewed and declined this request. You may appeal this decision by reopening this request.