The following reply was made to PR kernel/5777; it has been noted by GNATS.

From: RD Thrush <rd@thrush.com>
To: kurt@intricatesoftware.com
Cc: gnats@cvs.openbsd.org
Subject: Re: kernel/5777: kernel hang
Date: Wed, 09 Apr 2008 02:40:28 -0400

 RD Thrush wrote:
 > Kurt Miller wrote:
 >> I noticed you are using mfs on these systems. How big are they?
 >> It would be convenient if you provided a summary of the following
 >> for the systems experiencing the hang:
 >>
 >> System #, arch, real mem size, total swap size, total mfs size
 >> -------------------------------------------------------------------------------------------- 
 >>
 >>   
 > 1 Athlon64 X2      amd64 1023MB    3,147,752K       503,854K
 > 2 Sempron          amd64  479MB    1,048,824K       201,454K
 > 3 Mobile Athlon 64 amd64 1278MB    1,572,984K       403,054K
 >  Mobile Athlon 64  i386 1278MB    1,572,984K       403,054K
 > 4 Soekris 5501      i386  511MB    1,052,257K       100,654K
 >
 >
 >
 >> Also please try some tests without mfs involved.
 >>   
 >
 > Ok, I'll be able to work with the Soekris later today and will remove 
 > mfs from fstab.  I could boot a kernel with UVMHIST (that I have with 
 > debug symbols) or a snapshot.  Any preference?
 
 I installed an i386 snapshot, 4.3-current (GENERIC) #792: Sun Apr  6 
 22:49:37 MDT 2008, on the Soekris without mfs over 28 hours ago.  It has 
 continuously been running the test without hanging.  I installed the 
 same snapshot on the laptop (#3 above) without mfs and ran the test for 
 12 hours hanging.  I then added mfs, rebooted the same snapshot and had 
 the hang within 30 minutes.  So, it seems you've definitely isolated the 
 conditions that cause the hang.
 
 I typically have something like "/dev/wd0b /tmp mfs 
 rw,-s=819200,nosuid,noexec,nodev 0 0" in /etc/fstab.
 
 Is mfs busted?  Am I abusing mfs?  Where do we go from here?
 
 Thanks, Bob