[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Status: Triaged => Fix Released

** Changed in: linux (Ubuntu Vivid)
   Importance: Undecided => High

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Title:
  Networking hangs on azure using hv_netvsc; bisected

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.19.0-37.42

---
linux (3.19.0-37.42) vivid; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
- LP: #1518406

  [ K. Y. Srinivasan ]

  * SAUCE: Drivers: hv: vmbus: Fix a Host signaling bug
- LP: #1508706

 -- Kamal Mostafa   Fri, 20 Nov 2015 09:49:10 -0800

** Changed in: linux (Ubuntu Vivid)
   Status: Fix Committed => Fix Released

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Title:
  Networking hangs on azure using hv_netvsc; bisected

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Joshua R. Poulson]

We've done broad testing on this kernel and it looks good, thanks!

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  Networking hangs on azure using hv_netvsc; bisected

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Ovidiu Rusu]

I've tested this version of kernel from proposed: 3.19.0-37-generic and
everything works good.

** Tags removed: verification-needed-vivid
** Tags added: verification-done-vivid

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  Networking hangs on azure using hv_netvsc; bisected

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Luis Henriques]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
vivid' to 'verification-done-vivid'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-vivid

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Luis Henriques]

** Also affects: linux (Ubuntu Vivid)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Vivid)
   Status: New => Fix Committed

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  Networking hangs on azure using hv_netvsc; bisected

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[K Y Srinivasan]

Yes, I submitted v2 version of the patch yesterday. The two versions are
functionally equivalent and obviously I would prefer you pick up the
second version. However if the kernel is built and ready to go, I would
go with the first version. Andy is right in that there will be one more
patch that will use the functionality exposed here but that will be in
netvsc code and that is not a correctness issue. I want this patch to be
applied to stable and the patch could not be more than 100 lines. Once
Greg commits this patch, I will be submitting the follow on patch in
netvsc.

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Kamal Mostafa]

The v1 version of KY's patch has been applied to Vivid[0] and is
building now as (3.19.0-37.42).  We intend to replace it with the
mainline version in the future, once the dust settles.

[0] http://kernel.ubuntu.com/git/ubuntu/ubuntu-vivid.git/commit/?h
=master-next=0b599c6174684f18f8bd635cb94f483c7682c4f8

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Bryan Quigley]

Got another confirmation that the patch (first one) fixes the issue.

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Jay Vosburgh]

SRU Justification:

Impact:

Bug causes easily reproducible freeze of networking on affected
systems when under moderate to high network load.  Ordinary benchmark
tools such as iperf induce the problem without difficulty.  Affected
systems are virtual machine instances running on Azure, utilizing the
hv_netvsc network device driver.

Fix:

Fix is to apply patch provided by Microsoft:

http://marc.info/?l=linux-kernel=144787522532687=2

Testcase:

Tested as described in Bug Description.

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Jay Vosburgh]

We are testing this patch immediately (overnight US time) and will
report our results as soon as they are available

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Title:
  Networking hangs on azure using hv_netvsc; bisected

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Stephen A. Zarkos]

KY has pushed a patch to LKML that resolves this issue:
https://lkml.org/lkml/2015/11/18/690

This patch needs to be applied to the Vivid kernel and beyond.  This is
a critical patch, can you please take this patch as sauce for now so we
can get it out as quickly as possible?

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Jay Vosburgh]

I have tested the patch referenced in comment #5 and it appears to
resolve the network hang.

I first built and tested the Ubuntu LTS 3.19.0-31.36~14.04.1 kernel and
reproduced the issue using the methodology described in the original bug
description.  This is commit

commit 15e42c329445b4e0f0aecefc39e205c44755c2ba
Author: Luis Henriques 
Date:   Thu Oct 8 10:26:57 2015 +0100

UBUNTU: Ubuntu-lts-3.19.0-31.36~14.04.1

in the lts-backport-vivid branch of git://kernel.ubuntu.com/ubuntu
/ubuntu-trusty.git

I then applied the referenced patch and tested again and was unable to
reproduce the issue after roughly an hour of testing.

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  Networking hangs on azure using hv_netvsc; bisected

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Alex Ng]

Hi Jay,

Does this issue occur even when VXLAN is not configured between the two
instances?

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Jay Vosburgh]

Yes, it did, although it seemed to be easier to reproduce with vxlan
configured.

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Joshua R. Poulson]

We are investigating this report and will update the bug when we know
more.

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Joseph Salisbury]

** Tags added: kernel-da-key kernel-hyper-v

** Changed in: linux (Ubuntu)
   Status: Incomplete => Triaged

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[Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

[Christopher M. Penalver]

** Tags added: bisect-done

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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