[Xen-devel] kernel panic with no call trace

[Minjun Hong <nickeysgo@xxxxxxxxx>]

Hello~~

I'm struggling to resolve a kernel panic problem during developing scheduler code.

But I have not made any progress since I can not get any meaningful information from the serial log.

When the panic occurred, always there is no call trace and only panic notification like following:

(XEN)

(XEN) ****************************************

(XEN) Panic on CPU 0:

(XEN) cpu:20, vcpu:20 in csched_schedule(1891)

(XEN) cpu:21, vcpu:21 in csched_schedule(1891)

(XEN) cpumask_test_cpu(cpu, prv->in_cosched) in csched_schedule(1907)

(XEN) cpumask_test_cpu(cpu, prv->in_cosched) in csched_schedule(1907)

(XEN) cpumask_test_cpu(cpu, prv->in_cosched) in csched_schedule(1907)

(XEN) cpumask_test_cpu(cpu, prv->in_cosched) in csched_schedule(1907)

(XEN) FATAL PAGE FAULT

(XEN) [error_code=0000]

(XEN) Faulting linear address: ffff830078efcc98

(XEN) ****************************************

(XEN)

(XEN) Reboot in five seconds...

I'm using Xen-4.5.0 on my server having 2 Intel Xeon E5-2620 v4 cpus, 128 GB RAM(16 GB DDR4 * 4) and 1 TB HDD and, using Ubuntu 14.04 LTS.

Is there any method to make the call trace show up or 

when there is no call trace, please tell me from where I should start to debug.

Thanks in advance and I wait for your comments.

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