Machine unresponsive with cache_lock: blocked on... message

Francois Tigeot ftigeot at
Tue Mar 2 00:29:17 PST 2010

On Sat, Feb 20, 2010 at 09:01:41AM -0800, Matthew Dillon wrote:
> :
> :My backup machine has been rendered unresponsive.
> :
> :It is a Core 2 Duo / 2GB system running DragonFly v2.5.1.766.g3da46-DEVELOPMENT
> :(from 2010-02-11)
>     Definitely upgrade to the latest.  I fixed a few NFS related deadlocks
>     in the namecache.  The issues were related to the readdirplus change.

I just got a new crash.

The system was running DragonFly v2.5.1.902.g333f4-DEVELOPMENT from the 25th.

There were these messages on the console:

Warning: pmap_interlock 00010003
Warning: pmap_interlock 00010003

No cache_lock stuff this time.

The machine did respond to ping and to some limited keyboard action:

- I could switch virtual terminals via ALT-F2, -F3 etc...
- I could switch numlock/scroll lock/capslock/ keyboard leds on or off
- I could move back in console history with scroll lock / Page Up or Page Down

Apart from that, typing on the keyboard had no effect.

I could get a core dump via ctl-alt-esc; you can get it here:

Francois Tigeot

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