[Bug 259487] Re: xen virtual Machines and Dom0 crashes with "BUG: soft lockup - CPU#0, CPU#1, CPU#2, CPU#3 stuck for 11s!"

[John Leach]

I managed to reproduce this quite reliably so did some trials to find
out how to improve things.

This is 64bit dom0 on Xen 3.3.0 (On Centos) on Dell 2940s  The domU is a
32bit Hardy box with 1G ram.  With all the available hardy Xen kernels,
this soft lockup kept happening.  I tried also tried
"clocksource=jiffies".   Then I tried the latest Intrepid kernels and
the problem was solved.

As I understand, the Intrepid kernel has the proper kernel.org upstream
xen support (rather than the forward ported patch from 2.6.18 as is
Hardy iirc).  So whilst this solves the problem (for me), it's a pretty
big change and isn't something I'd expect to see "backported" to Hardy.

The new upstream Xen stuff changes the way block devices and the console
are done, so you can't switch without some tweaks to your Xen configs
(and guest OS config) but other than that it seemed to work fine with
Hardy.

Incidentally, I replaced this domU with a 64bit Hardy install, with the
standard 64bit Hardy kernel, and that also solved the soft lockups.

-- 
xen virtual Machines and Dom0 crashes with "BUG: soft lockup - CPU#0,CPU#1,CPU#2,CPU#3 stuck for 11s!"
https://bugs.launchpad.net/bugs/259487
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