Date: Wed, 01 Jul 2009 16:08:37 +0300 From: Manolis Kiagias <sonicy@otenet.gr> To: Nikos Vassiliadis <nvass9573@gmx.com> Cc: freebsd-questions@freebsd.org Subject: Re: Failing to show 'Password:' prompt Message-ID: <4A4B5FD5.1090604@otenet.gr> In-Reply-To: <4A4B2C64.4040508@gmx.com> References: <4A4B0E8E.4090501@otenet.gr> <4A4B2C64.4040508@gmx.com>
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Nikos Vassiliadis wrote: > Manolis Kiagias wrote: >> This morning my server was unresponsive both from ssh and through >> http. The only thing that is different on this system on a 1st of >> month, is a dump job that runs through periodic (on a mostly inactive >> system). >> >> Visiting the console, I discovered the system was still up and >> displaying login prompt on all vtys, but after typing a username, the >> password prompt would never appear. Keyboard was responsive and I >> could even switch between keyboard layouts (English/Greek). Plugging >> and and unplugging an external USB drive, showed the kernel messages >> on tty0. Still, I could not get it to display a password prompt and >> had to hard reboot it. >> >> I can't find anything in /var/log/messages either - it stops at 5.25 >> in the morning. And the dump was not performed either (and there are >> no traces about it in the log). >> >> What kind of crash could cause the password prompt to not display? >> Ideas? > > Geia Manoli, > > A deadlock somewhere in the filesystem code would expose > such behavior. Other subsystems may continue to work, but > some operations, somehow related to that filesystem code, > will wait - forever - for some locks to be released. > > I've seen such behavior in early RELENG_6 branch with regard > to UFS snapshots. > > Nikos > > Thanks Niko, This is quite possible actually as I was using dump -L and the USB backup disk was still mounted when I looked at the console messages. I'll check the PR database for dump-related problems.
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