Re: PHP Fatal error: Unable to start session mm module in Unknown on line 0

["Thomas R. Shemanske" <thomas.r.shemanske@dartmouth.edu>]

/usr/share/doc/php4/README.Debian.gz suggests not only the things you 
have tried (although on my system the file is called
/tmp/session_mm_apache0.sem (with 600 perms)), but also that it may be 
related to php4-cgi



Other caveats
-------------


 * Problem with module and php4-cgi

        PHP Fatal error:  Unable to start session mm module in Unknown 
on line 0

   1) Remove /tmp/session_mm.sem or give access permission to the user 
running php4.
   2) increase the limit on shared memmory (echo "33554432" > 
/proc/sys/kernel/shmmax).
      This is mainly needed on non-i386 archs. The default is 8MB, but 
that seems too low.



What happens if you uninstall the php4-cgi package?  Will apache start?

Occasionally, there have been problems with the load order of the php4 
modules.  Try changing the order in the php.ini file.

Look for the extension lines, e.g.,

extension=imap.so
extension=mysql.so


Luck