Apache Crashes - Resource temporarily unavailable: setuid

Hi,
I'm running Apache 2.0.54 on Fedora Core 4.  Apache crashes
with a 
frequency varying between a few minutes and a few hours. 
Apache doesn't 
die cleanly, so it can't start again until the child
processes have all 
died.  When I try to start Apache immediately after a crash,
I get the 
following error:

(98)Address already in use: make_sock: could not bind to
address 
64.90.180.93:11008
no listening sockets available, shutting down
Unable to open logs

Only by killing all Apache processes, or at least the ones
binding to 
port 11008, can I restart Apache immediately.  Otherwise I
need to wait 
a few minutes before Apache will start again.

The following is a snapshot of the error log around a crash
time:

[Fri Jul 28 12:52:33 2006] [alert] (11)Resource temporarily
unavailable: 
setuid: unable to change to uid: 48
[Fri Jul 28 12:52:33 2006] [alert] (11)Resource temporarily
unavailable: 
setuid: unable to change to uid: 48
[Fri Jul 28 12:52:33 2006] [alert] Child 1169 returned a
Fatal error... 
Apache is exiting!
[Fri Jul 28 12:52:33 2006] [emerg] (43)Identifier removed:
couldn't grab 
the accept mutex
[Fri Jul 28 12:52:33 2006] [emerg] (43)Identifier removed:
couldn't grab 
the accept mutex

Google searches indicated to me that increasing swap space
might help, 
but after adding another gig of swap space Apache continued
to crash.  I 
was unable to find any other promising information.

I had seen a similar problem where I was unable to su to a
user, but by 
changing their uid I was able to su to them.  Thus I tried
making Apache 
run as a different user (I didn't think it would be wise to
try to 
change Apache's uid).  This lengthened the time between
crashes, but 
didn't stop them altogether.  I am currently running Apache
as this 
other user to keep Apache up for longer.

I also thought that pam_limits might be causing a problem. 
Turning 
pam_limits off made Apache crash more often.  Increasing the
number of 
processes that Apache was allowed to run in pam_limits was
not helpful.

I haven't made any recent configuration changes to my
machine other than 
those mentioned to try to fix Apache.  Before a few days
ago, Apache had 
been running for weeks without crashing.  How can I keep
Apache from 
crashing, and what might have cause it to start crashing in
the first place?
_________________
Mike Morris
mikedatdec.com

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Hi,
This is a bit of a wild guess but could it be that something
is
draining your semaphore space? Try running ipcs regularly up
to the
crash and see if the list grows significantly.

-- 
noodl

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Hi,
I tried running ipcs -s regularly and piping it to word
count.  I output 
this to a text file so I could observe this value at the
time Apache 
crashed.  There were always 5 semaphore arrays, or none
while Apache was 
down.  Is the number of these arrays supposed to vary more? 
Do these 
values signal any problems, and what might they be?

The other bizarre thing, is that Apache crashes very rarely
if I'm 
watching it.  This morning it was crashing every few minutes
until I 
woke up.  Now that I've started watching it, it hasn't
crashed in 20 
minutes.  Does this make any sense to anybody?

_________________
Mike Morris
mikedatdec.com

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Server Project.
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