On Apache/2.2.15, is it normal to have one or two "[warn] mod_fcgid: process XXXXX graceful kill fail, sending SIGKILL" per day? After all it's a warning, not an error.
I dealt with the problem by tracking down the cause of SIGKILL and eliminating them. Now I get 0 SIGKILL warnings per day. I will consider this level the normal level. See this question for more details.
Other people have reported a similar issue with FCGID processes hanging and being unkillable in other systems, such as Wordpress and Sympa.
A suggested fix was to add the option
to the Apache configuration (default for this setting is 131072). I have not been able to verify this fixes the issue but there is anecdotal evidence to indicate that it does.