5.4 Hanging, have some DDB output, unable to get panic dump

[Philip Kizer]

On 10/3/05, Philip Kizer <pckizer at nostrum.com> wrote:
> The system was updated (from uname):
>     FreeBSD 5.4-STABLE #2: Wed Sep 21 15:55:00 CDT 2005
> And the console log is (2 events):
> [note: machine hung, could not do anything from current logins or  
> running daemons]


On Oct 3, 2005, at 13:01, David Kirchner wrote:
> I was seeing this error with 5.4-RELEASE, on a machine with 4GB, and
> when using PAE. Are you using PAE? If so, you'll need to either
> upgrade to 5-STABLE or apply a 2 line patch to your 5.4-STABLE system
> (the patch hasn't been committed to that branch yet, it should
> probably be committed to 5-4.RELEASE-p*). You can find the patch by
> searching the archives for "PAE" and "pmap.c".

Thanks for the response, from what I'm finding from my search, it  
looks like you mean this:

http://lists.freebsd.org/mailman/htdig/freebsd-stable/2005-August/ 
017607.html

and the referenced patch:

http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/i386/pmap.c.diff? 
r1=1.523&r2=1.524&f=h


But, the version I'm running as listed above shows to have pmap.c:

__FBSDID("$FreeBSD: src/sys/i386/i386/pmap.c,v 1.494.2.10 2005/08/08  
15:33:53 jhb Exp $");

which already has the new code (and I'm having a hang, not the panic  
that was described without that patch).

Or did I find some articles that was not what you were referring to?


FYI: Just to describe the hang a bit more, I do get some response  
from the machine, it just cannot do any useful work.  For instance,  
on the console:

     If I hit return at "login:", I get a new "login:" prompt, but as  
soon as I enter a username+^M or Ctrl-D it, I cease to receive any  
feedback besides terminal echo from my input.

     If I'm logged in on the console I can even hit return in the  
shell and get a new shell prompt, but any command I try (i.e.  
'uptime' or 'uname') then results in the same lack of any further  
response.

     Plus, I cannot DDB "db> panic" the box as that then produces a  
hard-hang, so no sync+core and then I don't even get tty echo from my  
input.


Thanks,
Philip