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Date: Thu, 20 May 2004 16:02:43 -0700 (PDT)
From: Wim <wim@q-prime.net>
To: freebsd-gnats-submit@FreeBSD.org
Subject: MD devices trash system
X-Send-Pr-Version: www-2.3

>Number:         66966
>Category:       i386
>Synopsis:       MD devices trash system
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-i386
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu May 20 16:10:19 PDT 2004
>Closed-Date:    Wed Jun 16 08:08:24 GMT 2004
>Last-Modified:  Wed Jun 16 08:08:24 GMT 2004
>Originator:     Wim
>Release:        5.2.1, 5.2, 5.0
>Organization:
>Environment:
DEFAULT kernels on 5 machines
>Description:
MD devices lock up when beeing used intensively, eating up all CPU time and disabeling other programs to be executed; in the end the machines just hang; rebooting is not possible unless done by physically resetting the server by turning it off and back one. Terminating the MD device or unmounting it seems to be impossible.
>How-To-Repeat:
Manifests on all Intel P2 Celeron, P3 and P4 I've tested, but not on AMD; simply create an MD-virtual disk and use it intensively by compiling a program on it for example or building a world to it.
Tested on multiple BSD installations; though BSD 5.0 seems to have less problems with it then 5.2.1.
>Fix:
Unkown
>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed 
State-Changed-By: phk 
State-Changed-When: Wed Jun 16 08:06:14 GMT 2004 
State-Changed-Why:  
I am sufficiently convinced that you have created too big malloc backed 
MD disks that I will set the PR closed. 

Please see the md(4) manual page for a more on this. 

Should your problem not be this, then please update this PR with some 
actual details so we might have a chance of figuring out whats going on. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=66966 
>Unformatted:
