[Xen-devel] Post 2.6.21 pv-ops kernels hang Nahelem systems when domU is started - BUG: soft lockup - CPU#0 stuck for 61s! [swapper:0]

[Bruce Edge <bruce.edge@xxxxxxxxx>]

I didn't report this earlier as I thought it must have been my fault
as I pruned out a lot of modules from the pvops kernel. With the .23
release and the same behavior with the same config that was working
with 2.6.32.18, I felt I needed to report this now as I don't think
it's my fault anymore.

The dom0 boot's OK, bu hangs as soon as a pvops domU is started. The
HVM domU is OK.

On the domU I get:

┌────────────────────────────────────────────────────────────────────────┐
 │ dpm-domu 6.0.15-01, with Linux 2.6.32.23-3-rollback-to-18-config       │
 │ Memory test (memtest86+)                                               │
 │ Memory test (memtest86+, serial console 115200)                        │
 │                                                                        │
 │                                                                        │
 │                                                                        │
 │                                                                        │
 │                                                                        │
 └────────────────────────────────────────────────────────────────────────┘
     Use the ^ and v keys to select which entry is highlighted.
     Press enter to boot the selected OS, 'e' to edit the
     commands before booting, 'a' to modify the kernel arguments
     before booting, or 'c' for a command line.


Started domain dpm (id=1)



The Dom0 console shows:

(XEN) tmem: all pools frozen for all domains
(XEN) tmem: all pools thawed for all domains
(XEN) tmem: all pools frozen for all domains
(XEN) tmem: all pools thawed for all domains
mapping kernel into physical memory
about to get started...

<one minute passes...>

[46287.941296] BUG: soft lockup - CPU#0 stuck for 61s! [swapper:0]
[46353.441235] BUG: soft lockup - CPU#0 stuck for 61s! [swapper:0] one
more of these every 60 sec.
[46418.941235] BUG: soft lockup - CPU#0 stuck for 61s! [swapper:0]


This is consistent with xen 4.1 and  4.0.2rc1pre

Kernel config and boot log attached.

-Bruce

config.debug
Description: Binary data

boot.log
Description: Text Data

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