[SOLVED!] (38)Function not implemented: Couldn't create accept lock

[James H.Cloos Jr. <cloos@jhcloos.com>]

This bug is not limited to mod_rewrite; it affects all lock files.

Is it perhaps a kernel 2.4 vs 2.6 issue?  

I'm running sid on a leased uml running 2.4.21-7um.

The function that dies is in:

   httpd-2.0.48/server/mpm/prefork/prefork.c:ap_mpm_run

where it calls:

    rv = apr_proc_mutex_create(&accept_mutex, ap_lock_fname, 
                               ap_accept_lock_mech, _pconf);

that function is defined in:

   httpd-2.0.48/srclib/apr/locks/unix/proc_mutex.c

and that ends up choosing one of these:

   new_mutex->inter_meth = &apr_proc_mutex_unix_fcntl_methods;
   new_mutex->inter_meth = &apr_proc_mutex_unix_flock_methods;
   new_mutex->inter_meth = &apr_proc_mutex_unix_sysv_methods;
   new_mutex->inter_meth = &apr_proc_mutex_unix_posix_methods;
   new_mutex->inter_meth = &apr_proc_mutex_unix_proc_pthread_methods;


I cannot tell from the strace which it is selecting.

But adding:

AcceptMutex fcntl

in the <IfModule prefork.c> section solved the problem.

-JimC