Machine unresponsive with cache_lock: blocked on... message

Francois Tigeot ftigeot at
Thu Mar 4 23:08:03 PST 2010

On Thu, Mar 04, 2010 at 04:09:27PM -0800, Matthew Dillon wrote:
> :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.
>     It looks like a deadlock between the VM system and HAMMER due to
>     kmalloc() blocking during a low memory situation.  Your system
>     was paging heavily at the time and was low on free memory.

This particular machine has 2GB main memory.

I've noticed 2.5 has a tendency to swap more than 2.4; it seems heavy disk
activity (rsync) gets cached at the expense of running applications.

>     I have committed a change to master which should fix this particular
>     issue.

Thanks, I'm upgrading right now.

Francois Tigeot

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