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From Scot Russell <>
Subject RE: [users@httpd] AH00485: scoreboard is full, not at MaxRequestWorkers
Date Tue, 02 Jun 2015 00:33:00 GMT
I don't know much on this, but for the bug link you included, one comment mentioned it being
a problem with event mpm, that went away when using worker mpm.  Is it possible to try the
worker mpm?

Date: Mon, 1 Jun 2015 23:58:13 +0000
Subject: [users@httpd] AH00485: scoreboard is full, not at MaxRequestWorkers

Sorry for the bandwidth, this is a repeat send from January.We STILL have this issue. 
Perhaps a new look might jolt your memory and help me resolve this issue!!!

Problem: Apache 
server will stay up for random amount of time, usually days, but 
eventually enters a hung state. When hung the CPU load gradually spikes 
on the machine and new web server requests are unresponsive. Only a full server stop/kill
and restart will resolve the issue, at which time the host load average drops quickly to normal.
Error logs typically contain many many lines of:    Wed Jan 28 16:06:58.667188 2015] [mpm_event:error]
[pid 25336:tid 1] AH00485: scoreboard is full, not at MaxRequestWorkers
 have done a lot of web research on this top and have found many cases 
where others have had the same/similar issue but no real solutions. 
Seem very close to this bug report:
(VM) SunOS myhostname 5.10 Generic_118833-36 sun4v sparc SUNW,Sun-Fire-T200 8G RAMhttp Conf:StartServers
                     8MinSpareServers              Not setMaxSpareServers             Not
setServerLimit                       256MaxRequestWorkers        200MaxConnectionsPerChild
200KeepAlive                         OnTimeOut                           3000MaxKeepAliveRequests
  50KeepAliveTimeout            2RequestReadTimeout header=10-20,MinRate=500 body=20,MinRate=500
We use LDAP to authenitcate most of our web tools, and this is configured like:
## Enable the LDAP connection pool and shared# memory cache. Enable the LDAP cache status#
handler. Requires that mod_ldap and mod_authnz_ldap be loaded.#LDAPSharedCacheSize 500000LDAPCacheEntries
1024LDAPCacheTTL 600LDAPOpCacheEntries 1024LDAPOpCacheTTL 600
Current non-hung Score Board:Apache Server Status for myserver.domain (via

Server Version: Apache/2.4.12 (Unix)Server MPM: eventServer Built: Feb 20 2015 13:47:55
Current Time: Monday, 01-Jun-2015 16:52:14 PDTRestart Time: Monday, 01-Jun-2015 00:35:23 PDTParent
Server Config. Generation: 1Parent Server MPM Generation: 0Server uptime:  16 hours 16 minutes
51 secondsServer load: 1.06 0.84 0.60Total accesses: 8263 - Total Traffic: 414.7 MBCPU Usage:
u20.9 s32 cu660.69 cs121.41 - 1.42% CPU load.141 requests/sec - 7.2 kB/second - 51.4 kB/request2
requests currently being processed, 98 idle workers

ThreadsAsync connections
Sum6 298005

........Any thoughts/comments on http conf tuning, OS patches, apache bug fixes appreciated.This
is a production server, so you can imagine, having it go down at random times (usually when
I am asleep) is not fun!Thanks.MJ 		 	   		  
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