RE: LOR on current

From: Kris Kennaway [mailto:kris_at_obsecurity.org]
> On Wed, Mar 24, 2004 at 02:10:40PM -0500, Don Bowman wrote:
> > From: Kris Kennaway [mailto:kris_at_obsecurity.org]
> > > On Wed, Mar 24, 2004 at 11:04:03AM -0500, Don Bowman wrote:
> > > > From: Don Bowman [mailto:don_at_sandvine.com]
> > > > > So my machine which has been locking up daily under current
> > > > > (cvs up from saturday) this time showed this message to 
> > > > > serial before locking up:
> > > > 
> > > > And I got another, but this one it recovered from after a ~20s
> > > > hang.
> > > > 
> > > > machine has 4GB ram, adaptec ASR raid, 2 2.8GHz xeon with
> > > > symmetric multi threading yielding 4 processor contexts.
> > > > The only process it runs (other than system related stuff)
> > > > is postgresql.
> > > 
> > > You really need to do some research before submitting the 
> 500th copy
> > > of 2 non-bug reports :-)
> > 
> > I was hoping that it would jog someone's memory. I've been
> > trying to do some research, but have not found a patch to
> > the problem. The machine locks up entirely, no debugger or anything,
> > so i'm at a bit of a loss not having debugged these before.
> > 
> > is it expected that one can get a core or panic or into db
> > at this time?
> > 
> > As you can imagine, searching for lock order reversal returns
> > a lot of hits.
> > is it 'kern/60581: lock order reversal'? this indicates its
> > a 'known false positive'... But my machine locks up solid.
> > So i think that's not it.
> 
> Right, I think that's not the cause of your lockup :)

Not being one to believe in coincidences... I'm typing 
on the serial console. The machine halts, i can no longer type.
some seconds pass, out pops that message. This time too it
returned. Most times (when i run two postgresql vacuums simulatenously
for example), that's the end of it.

I will continue to investigate.