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
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