From owner-freebsd-bugs  Thu Apr  9 22:10:08 1998
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Date: Thu, 9 Apr 1998 22:10:01 -0700 (PDT)
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From: David Greenman <dg@root.com>
Subject: Re: kern/6258: FreeBSD-2.2.6 VM lockup on kernel map due to brelse calling bfreekva(), dump lockup in getnewbuf() due to fragmented buffer_map 
Reply-To: David Greenman <dg@root.com>
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The following reply was made to PR kern/6258; it has been noted by GNATS.

From: David Greenman <dg@root.com>
To: dillon@best.net
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/6258: FreeBSD-2.2.6 VM lockup on kernel map due to brelse calling bfreekva(), dump lockup in getnewbuf() due to fragmented buffer_map 
Date: Thu, 09 Apr 1998 22:04:25 -0700

 >	Since we can't put the bfreekva() back into brelse(), my solution
 >	is to put code in getnewbuf().  If the vm_map_findspace() call
 >	fails, my proposed code (the second set of changes below) wipes
 >	the kvm mappings for all EMPTY bp's in an attempt to defragment it
 >	then retries the vm_map_findspace() call.
 
    This is similar but different from the way it was fixed in -current. The
 fix from -current should be adopted for -stable.
 
 -DG
 
 David Greenman
 Core-team/Principal Architect, The FreeBSD Project

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