panic in netisr (I think) + DUMP FAILED (ERROR 6)

[Ruslan Ermilov]

On Fri, Aug 14, 2009 at 10:47:05AM +0200, Ian FREISLICH wrote:
> "Bjoern A. Zeeb" wrote:
> > On Fri, 14 Aug 2009, Ian Freislich wrote:
> > 
> > Hi,
> > 
> > > I finally hooked up a console to this machine because its dumps
> > > have been broken or corrupted for many months.  Sadly there isn't
> > > much more infonmation than this console capture.
> > >
> > >
> > > Fatal trap 12: page fault while in kernel mode
> > > cpuid = 10; apic id = 0a
> > > fault virtual address   = 0x1f5cd38
> > ...
> > > Uptime: 6d13h28m14s
> > 
> > this has been fixed two days ago. Seeing your uptime you do not have
> > the fix. Please update to latest RELENG_8 or HEAD.
> 
> I suspected that.
> 
> Do you have any idea why kernel dumps are not working as shown in
> the OP?
> 
There was a message, "Attempt to write outside dump device boundaries.",
that explains that.  Search the mailing list archives where I explained
the underlying bug with current versions of FreeBSD (in short page maps
get updated while we're writing a dump, due to interrupts still enabled).


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer