[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

@Eduardo, the Zesty kernel is now EOL, so this bug has been marked as
invalid.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Eduardo Otubo]

This patch fixes the problem.

commit 7fa32e5ec28b1609abc0b797b58267f725fc3964
Author: K. Y. Srinivasan 
Date:   Tue Nov 14 06:53:33 2017 -0700

Drivers: hv: vmbus: Fix a rescind issue

The current rescind processing code will not correctly handle
the case where the host immediately rescinds a channel that has
been offerred. In this case, we could be blocked in the open call and
since the channel is rescinded, the host will not respond and we could
be blocked forever in the vmbus open call.i Fix this problem.

Signed-off-by: K. Y. Srinivasan 
Cc: sta...@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman 

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Status: In Progress => Invalid

** Changed in: linux (Ubuntu Zesty)
   Status: In Progress => Invalid

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Chris Valean]

We do not have a clear repro on this issue, but recently there have been 
several fixes for rescind, so those might help.
Let's close this for the time being.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

It's been a while since this bug was updated.  Does this bug still
exist, Chris?

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Chris Valean]

The new test kernel based on 4.10.0-26 also has this behavior.
We also checked the latest upstream and we're not seeing the failure, so let me 
discuss this internally to see why this fails on 4.10 but not on upstream.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

I built a test kernel with the patch on top of current 4.10.0-26.  It can be 
downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1664663/

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Chris Valean]

Joe, I take that back - comment #16 is incorrect.

I'm seeing a call trace kvp related when using a high numbers of cores on the 
VM on the test kernel provided.
We cannot repro that on 4.10.0-19 and nor in the latest one 4.10.0-26.

Can you please apply that patch on top of current 4.10.0-26 so we can re-test 
that?
Thank you!

Call trace for reference:

[   72.265165] BUG: unable to handle kernel NULL pointer dereference at 
0008
[   72.265177] IP: hv_begin_read+0xc/0x20 [hv_vmbus]
[   72.265178] PGD 0
[   72.265179]
[   72.265182] Oops: 0002 [#1] SMP
[   72.265783] Modules linked in: hv_utils(+) hv_storvsc aesni_intel(+) 
aes_x86_64 ptp hid scsi_transport_fc hv_netvsc c
rypto_simd pps_core hyperv_keyboard glue_helper cryptd psmouse pata_acpi floppy 
fjes hv_vmbus
[   72.265798] CPU: 48 PID: 300 Comm: ksoftirqd/48 Not tainted 
4.10.0-22-generic #24~lp1664663
[   72.265800] Hardware name: Microsoft Corporation Virtual Machine/Virtual 
Machine, BIOS 090006  05/23/2012
[   72.265801] task: 91907d62 task.stack: b78a00e6c000
[   72.265807] RIP: 0010:hv_begin_read+0xc/0x20 [hv_vmbus]
[   72.265809] RSP: 0018:b78a00e6fe00 EFLAGS: 00010202
[   72.265811] RAX:  RBX: 9190764ba000 RCX: 4084
[   72.265812] RDX: 9190764ba1c0 RSI:  RDI: 9190764ba120
[   72.265813] RBP: b78a00e6fe00 R08: 0027 R09: 000193c0
[   72.265814] R10: eac0c6e6 R11: 0010 R12: 9190764ba000
[   72.265815] R13: 9190764ba120 R14: 86005130 R15: 0006
[   72.265817] FS:  () GS:91907e20() 
knlGS:
[   72.265818] CS:  0010 DS:  ES:  CR0: 80050033
[   72.265820] CR2: 0008 CR3: 46a09000 CR4: 001406e0
[   72.265823] DR0:  DR1:  DR2: 
[   72.265824] DR3:  DR6: fffe0ff0 DR7: 0400
[   72.265825] Call Trace:
[   72.265832]  vmbus_on_event+0x49/0x70 [hv_vmbus]
[   72.265840]  tasklet_action+0x5e/0x110
[   72.265847]  __do_softirq+0x104/0x2af
[   72.265850]  run_ksoftirqd+0x29/0x60
[   72.265855]  smpboot_thread_fn+0x10a/0x160
[   72.265860]  kthread+0x109/0x140
[   72.265863]  ? sort_range+0x30/0x30
[   72.265867]  ? kthread_create_on_node+0x60/0x60
[   72.265870]  ret_from_fork+0x2c/0x40
[   72.265871] Code: eb f0 89 c6 48 c7 c7 70 2f 21 c0 e8 7e d0 19 c5 eb d8 66 
2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1f
44 00 00 48 8b 07 55 48 89 e5  40 08 01 00 00 00 0f ae f0 5d c3 0f 1f 84 00 
00 00 00 00 0f
[   72.265903] RIP: hv_begin_read+0xc/0x20 [hv_vmbus] RSP: b78a00e6fe00
[   72.265904] CR2: 0008
[   72.265922] ---[ end trace 896d8fc4b37b0731 ]---
[   72.265923] Kernel panic - not syncing: Fatal exception in interrupt
[   72.269147] Kernel Offset: 0x420 from 0x8100 (relocation 
range: 0x8000-0xbfff
)
[   72.269147] ---[ end Kernel panic - not syncing: Fatal exception in interrupt

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Chris Valean]

Please merge the changes.

Sorry for the delay on this, we did some testing and we're not seeing any 
issues in the test kernel.
We don't have a clear repro to exercise the bug behavior, but the changes do 
not break the functionality.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

I built a Zesty test kernel with commit a3ade8cc4.  It required commits
5c1bec61fdfcd, 37cdd991fac81 and 631e63a9f346c as prereqs.

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1664663/

Can you test this kernel and see if it resolves this bug?

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Status: Confirmed => In Progress

** Changed in: linux (Ubuntu Zesty)
   Status: Confirmed => In Progress

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joshua R. Poulson]

This fix is in linux-next now:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/hv/hv_kvp.c?h=next-20170605=a3ade8cc474d848676278660e65f5af1e9e094d9

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

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

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

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

** Changed in: linux (Ubuntu Zesty)
   Status: In Progress => Incomplete

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joshua R. Poulson]

Long is working on a patch for submission upstream that should help with
this, and I will add it here when he does.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

I built a test kernel after changing KVP_SCRIPTS_PATH to /usr/sbin/hypervkvpd.  
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1664663

Can you give that kernel a try?  If it resolves the issue, is that the
change you want to make instead of moving the scripts to
/usr/libexec/hypervkvpd/?  I don't believe that directory currently
exists.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Stuart Miller]

Hi Chris,

Thanks for investigating. I've tried again to confirm the problem still
occurs -- and it does, although sometimes it takes multiple restarts of
the hv-kvp-daemon.service for it to start successfully.

Some diagnostic information is below.

Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-62-generic x86_64)

user@server:~$ ps -ax | grep hv
   129 ?S< 0:00 [hv_vmbus_con]
   359 ?S  0:00 [hv_balloon]
   601 ?Ss 0:00 /usr/lib/linux-tools/4.4.0-62-generic/hv_vss_daemon 
-n
   603 ?Ss 0:00 
/usr/lib/linux-tools/4.4.0-62-generic/hv_fcopy_daemon -n

user@server:~$ sudo systemctl status hv-kvp-daemon.service
● hv-kvp-daemon.service - Hyper-V KVP Protocol Daemon
   Loaded: loaded (/lib/systemd/system/hv-kvp-daemon.service; enabled; vendor 
preset: enabled)
   Active: failed (Result: exit-code) since Thu 2017-03-09 20:50:24 UTC; 4min 
45s ago
  Process: 585 ExecStart=/usr/sbin/hv_kvp_daemon -n (code=exited, 
status=1/FAILURE)
 Main PID: 585 (code=exited, status=1/FAILURE)

Mar 09 20:49:24 server systemd[1]: Started Hyper-V KVP Protocol Daemon.
Mar 09 20:49:24 server KVP[585]: KVP starting; pid is:585
Mar 09 20:49:24 server KVP[585]: KVP LIC Version: 3.1
Mar 09 20:50:24 server KVP[585]: read failed; error:9 Bad file descriptor
Mar 09 20:50:24 server systemd[1]: hv-kvp-daemon.service: Main process exited, 
code=exited, status=1/FAILURE
Mar 09 20:50:24 server systemd[1]: hv-kvp-daemon.service: Unit entered failed 
state.
Mar 09 20:50:24 server systemd[1]: hv-kvp-daemon.service: Failed with result 
'exit-code'.


user@server:~$ dpkg -s linux-tools-4.4.0-62-generic
Package: linux-tools-4.4.0-62-generic
Status: install ok installed
Priority: optional
Section: devel
Installed-Size: 250
Maintainer: Ubuntu Kernel Team 
Architecture: amd64
Source: linux
Version: 4.4.0-62.83
Depends: linux-tools-4.4.0-62
Description: Linux kernel version specific tools for version 4.4.0-62
 This package provides the architecture dependant parts for kernel
 version locked tools (such as perf and x86_energy_perf_policy) for
 version 4.4.0-62 on
 64 bit x86.

user@server:~$ dpkg -s linux-cloud-tools-4.4.0-62-generic
Package: linux-cloud-tools-4.4.0-62-generic
Status: install ok installed
Priority: optional
Section: devel
Installed-Size: 248
Maintainer: Ubuntu Kernel Team 
Architecture: amd64
Source: linux
Version: 4.4.0-62.83
Depends: linux-cloud-tools-4.4.0-62
Description: Linux kernel version specific cloud tools for version 4.4.0-62
 This package provides the architecture dependant parts for kernel
 version locked tools for cloud for version 4.4.0-62 on
 64 bit x86.


Help > About Hyper-V Manager
Hyper-V Manager
Microsoft Corporation
Version: 10.0.14393.0

vmms.exe
Version
10.0.14393.351

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Chris Valean]

Hi Stuart,

>From your comment #8, I took the 16.04.2 server ISO and did an install.
This uses kernel 4.4.0-62 and after installing the linux-tools/cloud-tools, 
then I haven't ran into the initial issue.
Where you seeing the exact message from kvp that it didn't start?

Note that if the kernel is 4.4.0-62, you must explicitly use the version for 
the tools:
#apt install linux-tools-4.4.0-62-generic linux-cloud-tools-4.4.0-62-generic

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

** Changed in: linux (Ubuntu Zesty)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Zesty)
   Status: Triaged => In Progress

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Chris Valean]

Hi Joe,

Using today's ISO - zesty-server-amd64.iso from March 8th, and doing a fresh 
install, then installing linux-tools-generic and linux-cloud-tools-generic, I 
see that the KVP daemon starts at the reboot without the previous issue.
The tools are running on top of kernel 4.10.0-9.

However, now another issue surfaced.

A recent KVP daemon patch introduced a KVP_SCRIPT_PATH definition:
#define KVP_SCRIPT_PATH “/usr/libexec/hypervkvpd/”

LIS KVP implementation has 3 scripts:
hv_get_dns_info
hv_get_dhcp_info
hv_set_ifconfig

These scripts are put by default under /usr/sbin, however with the above 
change, now these must be moved under /usr/libexec/hypervkvpd.
Or of course, default to /usr/sbin from the kvp daemon source file if you want 
to keep the current structure.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Stuart Miller]

I have also seen this in 16.04.2, with the same symptoms as the OP.

Restarting the service (sudo systemctl restart hv-kvp-daemon.service)
seems to have fixed this problem across reboots.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

I built another 4.8.0-22 test kernel, but using a Yakkety tree.  That
kernel can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1664663/yakkety

Can you also give that kernel a try?

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Chris Valean]

The same error appears from KVP also on the test kernel
4.8.0-22_4.8.0-22.24~lp1664663.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

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

** Tags added: kernel-hyper-v

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

I built an early Zesty kernel and tools packages.  The packages can be
downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1664663/

Can you test out these packages?  That will tell us if this is a
regression.  If the bug still exists, we can try some earlier versions.

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

It sounds like this is only happening on Zesty, so let me build an early
Zesty kernel version with it's associated linux-tools and cloud-tools
packages.

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Title:
  [Hyper-V] kvp daemon start failure on Zesty

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Chris Valean]

Hi Joe,

The error comes from the kvp daemon, which is not part of the kernel itself.
Or along with the kernel-ppa are you also building linux-tools/cloud-tools?

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Title:
  [Hyper-V] kvp daemon start failure on Zesty

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

Can you see if this also happens with the latest mainline kernel:
 http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10-rc8

** Tags added: zesty

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Title:
  [Hyper-V] kvp daemon start failure on Zesty

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Joseph Salisbury]

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

** Tags added: kernel-da-key

** Also affects: linux (Ubuntu Zesty)
   Importance: High
   Status: Confirmed

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Title:
  [Hyper-V] kvp daemon start failure on Zesty

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[Bug 1664663] Re: [Hyper-V] kvp daemon start failure on Zesty

[Chris Valean]

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

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Title:
  [Hyper-V] kvp daemon start failure on Zesty

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