Date: Thu, 6 Jun 2013 10:24:52 -0300 From: Andrew Hamilton-Wright <ahamiltonwright@mta.ca> To: freebsd-questions@freebsd.org Subject: Boot hangs in single-user mode Message-ID: <D740464A-BDF9-4012-9629-D98383D0FB83@mta.ca>
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Strangely, it seems that I cannot boot single user, either using "boot = -s" from the boot loader, or using the boot menu. When I get to the = point where the root filesystem is mounted, it hangs right after = printing the message: Trying to mount root from ufs:/dev/ada0s1a Interestingly, there seems to be a bit of a sequence issue, as I have = also seen the mount message appear before the audio system comes up, so = occasionally, the last item printed is: pcm0: <USB audio> on uaudio0 If I boot normally, however, I can consistently reach a login prompt. I suspect that this may be a race condition of some kind, as yesterday I = am sure I successfully booted to single-user while trying to solve a = separate problem. In case the separate problem (failed disk) is relevant, the general = situation is this: - four disk machine: ada0 (/, /usr, /tmp, /var); ada1 (/research -- = data only), ada2 (/home), ada3 (/data -- also data only) - the disk ada2 has failed - in preparing to replace ada2, I have commented out all references to = it from /etc/fstab I am rebooting the machine at the moment as I wish to ensure that I know = which physical disk is ada2, so want to boot the machine without it = plugged in. I seem to have trouble booting at all with ada2 missing and = ada3 still attached, but can boot to multiuser with no problems in = either of these two configuration: - all disks (including the faulty one) plugged in, with ada2 references = removed from /etc/fstab - ada2 and ada3 not physically plugged in, and all references to either = removed from /etc/fstab Neither combination allows me to boot single-user. While I can clearly go ahead with my disk replacement, this is not only = strange and annoying, but potentially problematic. Has anyone else seen anything like this? I notice that there are = several messages (dating back to 2004) in the list indicating 'hang = after "Trying to mount root"' or 'hang after sbin_init' (which is the = message that will be seen when booting single-user in "verbose mode"). Thoughts? Ideas? Thanks, Andrew.
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