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Date: Sun, 5 Dec 2004 11:53:39 +0000 (GMT)
From: Robert Watson <rwatson@freebsd.org>
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To: Marta Resende <martarese@hotmail.com>
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cc: freebsd-stable@freebsd.org
Subject: Re: NFS filesystem breaks the boot
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On Sun, 5 Dec 2004, Marta Resende wrote:

> Hey,i upgrade using that options:
> 
> #cd /usr/src
> #make buildworld
> #make buildkernel KERNCONF=MINE
> #make installkernel KERNCONF=MINE
> #reboot
> (press 4 for single-user mode)
> #fsck -p
> #mount -u /
> #mount -a
> #cd /usr/src
> #mergemaster -p
> #make installworld
> #mergemaster
> 
> and when i reboot, freebsd stops under "Mounting NFS file systems:." 

Could you try hitting Ctrl-T at the point where things seem stuck?  This
will cause the kernel to print out information on the current foreground
process.  It will also tell us what, at a kernel level, the process is
blocked on.  For example:

paprika:~/ngcmac> sleep 10
load: 0.01  cmd: sleep 45193 [nanslp] 0.00u 0.00s 0% 452k

The sleep command is typically blocked in the nanslp wait channel in the
kernel.  You are likely to find a process blocked in [kqread], which is
often a suggestion that the process is blocked in a DNS lookup:

paprika:~/freebsd/commit/src/sys/kern> telnet www.unresolveable.org
load: 0.08  cmd: telnet 45211 [kqread] 0.01u 0.00s 0% 1944k

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Principal Research Scientist, McAfee Research