Re: [Crash-utility] Xen Dumping - Expectations
Jarod Wilson wrote:
On Mon, 2006-10-16 at 14:02 -0400, Dave Anderson wrote:
> > I've been playing with xen dumping on x86_64 and x86 (RHEL5 20061006.2);
> > The following is a simple crash session on x86_64 (using "xm dump-core
> > -L"):
>
> Interesting. It kind of looks like there's something different about the
> corefile contents when using "xm dump-core" as opposed to forcing
> a "real" crash, i.e., such as when using sysrq-c?
Hrm, yeah, interesting... Last I tried with an actual forced crash of a
guest, everything looked as expected when I spun up crash on the
resulting core file. Of course, its been two or three weeks now, so it
coulda changed. ;)
Actually, my best guess is that crash it just getting confused trying
to handle the "panic" task -- it presumes that there is one since it's
a xen "coredump" file, but in this case, there really isn't one. The new
"xm core-dump -L" facility is taking a "live dump" of a live system
without
forcing a panic. (I'm not sure what other flags besides "-L" exist,
and what they would do differently...)
Dave
> > Is xen dumping
> > supported on x86, x86_64, ppc, ia64?
>
> x86 and x86_64 only -- ia64 is still TBD.
ia64... yeah... I can't even get a xen guest to install w/o panicking
dom0... :(
> > Can anyone point me to docs that
> > talk about xen dumping (e.g. internal/external wiki?)
>
> None that I'm aware of...
>
> The best thing that you can do is come over to my office,
> and we'll get to the bottom of this. In the meantime, it would
> be interesting to know whether the behavior above is the
> same when you:
>
> 1. log into the domU
> 2. echo c > /proc/sysrq-trigger
And another way to do it: if your domU has sysrqs enabled, then you can
issue 'xm sysrq <domU name> c' from the dom0. That's actually what
will
get used for the rhts xen dumping test I've been meaning to finally
write for some time now... :)
--
Jarod Wilson
jwilson(a)redhat.com
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