Re: current hang: arp_drain: locked; punting

[Andrew Doran <ad%netbsd.org@localhost>]

On Wed, Oct 15, 2008 at 09:48:19AM +0200, Thomas Klausner wrote:

> On Tue, Oct 07, 2008 at 09:46:28AM +0200, Thomas Klausner wrote:
> > A 4.99.64/amd64 machine I'm administering had a hard hang two days
> > ago.
> > On the console was "arp_drain: locked; punting", 4 times.

The arp_drain message is expected. I have removed the printf in -current. It
can be taken as an indication that the system is under memory pressure.

> > The last I saw in a remote window where I had a top running was that
> > [system] was using 99% CPU.

Probably the pagedaemon trying to free up memory. There was a report of a
problem with it on tech-kern. I will try to reproduce the issue.

> Same machine hang yesterday with (probably contains lots of typos):
> fatal page fault in supervisor mode
> trap type 6 code 0 rip ffffffff...f0017661b es 0 rflags 10206 cr250 cpl 4 rsp 
> ffff...00000487457f0
> panic: trap
> syncing disks... 16 16 16...16 giving up

What location in /netbsd corresponds to the value of 'eip' given? Can you
get a crash dump from this system in order to get a backtrace?

Andrew