Description of problem: Since this morning browsing to a vhost using mod_python with mem_cache_module loaded in httpd.conf gives glibc "double free or corruption" errors in /var/log/httpd/error_log and makes httpd processes stick around. Version-Release number of selected component (if applicable): httpd-2.2.2-1.2 mod_python-3.2.8-3 How reproducible: Happens every time I uncomment the following line in httpd.conf: #LoadModule mem_cache_module modules/mod_mem_cache.so Steps to Reproduce: 1. Set up a vhost as shown in the attached vhost file 2. Make sure the following line is in your httpd.conf: LoadModule mem_cache_module modules/mod_mem_cache.so 3. Reload httpd 4. tail -f /var/log/httpd/error_log 5. Open a web browser and browse to the vhost Actual results: 1. No response received by the browser 2. In /var/log/httpd/error_log: *** glibc detected *** /usr/sbin/httpd: double free or corruption (fasttop): 0x000055555623b700 *** 3. Each time I reload the browser, a new httpd process starts and a new "double free or corruption" line is added to the error_log. The processes persist until killed. Expected results: 1. The vhost's web page to load nicely in the browser 2. No errors in error_log 3. httpd processes only stick around until the end of the session Additional info: 1. Commenting out the LoadModule line mentioned above in httpd.conf fixes it. 2. Bug #205018 seems like it could be related (it's where I found the fix) but it's closed. 3. Bug #230127 might possibly also be related 4. Packages upgraded this morning: Installed: python-sqlite2.x86_64 1:2.3.2-2.fc5 Updated: mod_suphp.x86_64 0.6.2-1.fc5 Updated: trac.noarch 0.10.3.1-1.fc5
Created attachment 149875 [details] The vhost file that triggers the bug
This is undoubtedly a global symbol collision. It should be fixed in mod_mem_cache, no doubt; it would be useful to know exactly what the problem is: can you download http://people.redhat.com/jorton/symclash/symclash.py and run as follows: # ./symclash.py /usr/lib64/httpd/modules/mod_mem_cache.so \ /usr/lib64/python2.4/{*/*.so,*/*/*.so,*/*/*/*.so} and attach the output to this bug report.
Created attachment 149878 [details] Output of running symclash.py As requested
Great, thanks. The collision is: Clashes for /usr/lib64/python2.4/site-packages/pysqlite2/_sqlite.so: with /usr/lib64/python2.4/site-packages/_sqlite.so => init_sqlite with /usr/lib64/httpd/modules/mod_mem_cache.so => cache_init
The fix for this needs to go upstream first, but is well understood. (the symbol collision has been fixed in python-sqlite2 also, for the record)
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