From owner-freebsd-bugs  Wed May 12 21: 0: 5 1999
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Date: Thu, 13 May 1999 00:03:47 -0400 (EDT)
From: Kevin Martin <sigma@cartserver.com>
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Subject: kern/11679: httpd and perl5 processes stuck in "nochan" eating CPU
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>Number:         11679
>Category:       kern
>Synopsis:       httpd and perl5 processes stuck in "nochan" eating CPU
>Confidential:   yes
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 12 21:00:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Kevin Martin
>Release:        FreeBSD 3.1-STABLE i386
>Organization:
pair Networks, Inc
>Environment:

	Xeon 500 Mhz, 512Mb RAM, SCSI and IDE drives, running typical
	mod_ssl installation.

>Description:

	httpd and perl5 processes enter "nochan" status and eat unlimited
	CPU capacity, while doing no useful work.  Can only be cleaned up
	by "kill -9".  We have developed a script to monitor for this and
	perform the kills.  However, it is affecting performance and
	causing blank pages to be returned from runaway httpd processes.
	We have also seen this under FreeBSD 2.2.7-STABLE for extremely
	busy servers with lots of CGI activity.

>How-To-Repeat:

	Just let the server run, even with only 2 hits/second.

>Fix:
	
	Unknown; these processes are becoming stranded somehow by the
	kernel.



>Release-Note:
>Audit-Trail:
>Unformatted:


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