Failing to show 'Password:' prompt
nvass9573 at gmx.com
Wed Jul 1 09:29:28 UTC 2009
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?
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.
More information about the freebsd-questions