NACK: [PATCH 0/3][BFGH][linux] Fix kdump failures

[Tim Gardner]

Sending v2

On 5/6/21 3:28 PM, Thadeu Lima de Souza Cascardo wrote:
> On Thu, May 06, 2021 at 02:59:42PM -0600, Tim Gardner wrote:
>> BugLink: https://bugs.launchpad.net/bugs/1927518
>>
>> [Impact]
>>
>> Microsoft has reported that a customer is not able to acquire a kdump
>> when a guest crashes.
>>
>> The following 3 patches fix the issue. Patch #1 solves a problem where the
>> “Unable to send packet via vmbus” message is output continuously. But with
>> that problem fixed, the second problem can occur where the kdump kernel
>> panics due to receiving an unexpected VMbus UNLOAD complete message.
>>
>> Patch #2 prevents the UNLOAD complete message from ever occurring in the
>> kdump kernel. But if the UNLOAD complete message does occur at some
>> unexpected time, Patch #3 prevents it from causing a panic.
>>
>> [Test Plan]
>>
>> Cause a guest kernel crash and acquire a kdump.
>>
>> [Where problems could occur]
>>
>> The increased Hyper-V timeout could have side effects.
>>
>> [Other Info]
>>
>> If these patches are deemed unsuitable for master, then I would at least like to have them
>> applied to fgh:linux-azure and bionic:linux-azure-4.15
>>
>> The Bionic patches are also all clean cherry-picks, but 'git am' would not apply
>> the third of the FGH patches. There is likely some option to 'git am' that I'm
>> too lazy to find or remember.
> 
> Hey, Tim.
> 
> All seem good here. The commits seem sensible and are restricted to Hyper-V.
> 
> You forgot no note the series to which the individual patches would apply,
> though.
> 
> Care to resend?
> 
> Thanks.
> Cascardo.
> 

-- 
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Tim Gardner
Canonical, Inc