[Xen-users] BUG: soft lockup - CPU#x stuck for 23s, xen: vector 0x2 is not implemented, INFO: rcu_sched self-detected stall on CPU { 11} (t=105006 jiffies)

[Eric DeMenthon <eric@xxxxxxxxxxxxx>]

Hi everyone, we've been sporadically losing contact with a couple of our domUs, only to log in via console and find that they're dumping this, repeating.

[343260.600053] INFO: rcu_sched self-detected stall on CPU { 11} (t=105006 jiffies)
[343260.600053] xen: vector 0x2 is not implemented
[343288.088057] BUG: soft lockup - CPU#7 stuck for 22s! [PassengerHelper:12103]
[343288.088059] BUG: soft lockup - CPU#9 stuck for 22s! [php:32213]
[343296.088055] BUG: soft lockup - CPU#11 stuck for 24s! [sh:10271]
[343316.088063] BUG: soft lockup - CPU#7 stuck for 23s! [PassengerHelper:12103]
[343316.088069] BUG: soft lockup - CPU#9 stuck for 23s! [php:32213]
[343324.088062] BUG: soft lockup - CPU#11 stuck for 22s! [sh:10271]
[343344.088057] BUG: soft lockup - CPU#7 stuck for 23s! [PassengerHelper:12103]
[343344.088060] BUG: soft lockup - CPU#9 stuck for 23s! [php:32213]
[343352.088055] BUG: soft lockup - CPU#11 stuck for 22s! [sh:10271]
[343372.088064] BUG: soft lockup - CPU#7 stuck for 23s! [PassengerHelper:12103]
[343372.088070] BUG: soft lockup - CPU#9 stuck for 23s! [php:32213]
[343380.088055] BUG: soft lockup - CPU#11 stuck for 22s! [sh:10271]
[343400.088057] BUG: soft lockup - CPU#7 stuck for 23s! [PassengerHelper:12103]
[343400.088060] BUG: soft lockup - CPU#9 stuck for 23s! [php:32213]
[343408.088062] BUG: soft lockup - CPU#11 stuck for 22s! [sh:10271]
[343428.088071] BUG: soft lockup - CPU#7 stuck for 23s! [PassengerHelper:12103]
[343428.088076] BUG: soft lockup - CPU#9 stuck for 23s! [php:32213]
[343436.088055] BUG: soft lockup - CPU#11 stuck for 22s! [sh:10271]

We're running Ubuntu 12.04, kernel 3.5.0-23-generic #35~precise1-Ubuntu SMP, 64 bit, Xen 4.1.2

Is upgrading to Ubuntu 14.04/Xen 4.4 likely to fix this?

Thanks,

Eric

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