[ovs-dev] [PATCH] datapath: Prevent panic

[Gregory Rose]

On 4/16/2018 11:32 PM, Pravin Shelar wrote:
> On Mon, Apr 16, 2018 at 10:58 AM, Greg Rose <gvrose8192 at gmail.com> wrote:
>> On RHEL 7.x kernels we observe a panic induced by a paging error
>> when the timer kicks off a job that subsequently accesses memory
>> that belonged to the openvswitch kernel module but was since
>> unloaded - thus the paging error.
>>
>> The panic can be induced on any RHEL 7.x kernel with the following test:
>>
>> while `true`
>> do
>>      make check-kmod TESTSUITEFLAGS="-k \!gre"
>> done
>>
>> On the systems I've been testing on it generally takes anywhere from a
>> minute to 15 minutes or so to repro but never longer than that.  Similar
>> results have been seen by other testers.
>>
>> This patch does not fix the underlying bug, which does need to be
>> investigated and fixed, but it does prevent it from occurring. We
>> would like to prevent customer systems from panicking while we do
>> futher investigation to find the root cause.
>>
> Can you add stack trace to the commit ?

Sure, I'll send a V2 in a bit.

Thanks,

- Greg