[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Hubba]

You are right. There is no such bug in 3.13.0-92 kernel for Trusty.

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  Kernel panic after migration between XenServer 6.5 hosts

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

The 3.19(lts-vivid) kernel is now EOL, so marking that as wont fix.
However, the Trusty 3.13 kernel is still supported.  I just wanted to
confirm you are not seeing this bug on Trusty using the 3.13 kernel?

** Changed in: linux-lts-vivid (Ubuntu)
   Status: In Progress => Won't Fix

** Changed in: linux-lts-vivid (Ubuntu Xenial)
   Status: In Progress => Won't Fix

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  Kernel panic after migration between XenServer 6.5 hosts

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

** No longer affects: linux (Ubuntu Trusty)

** Also affects: linux-lts-vivid (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: linux-lts-vivid (Ubuntu)
   Status: New => In Progress

** Changed in: linux-lts-vivid (Ubuntu Xenial)
   Status: New => In Progress

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

** Changed in: linux-lts-vivid (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: linux-lts-vivid (Ubuntu)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux-lts-vivid (Ubuntu Xenial)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

** Changed in: linux (Ubuntu Xenial)
   Status: In Progress => Fix Released

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Hubba]

Tried 14.04 with 3.19.0-65 kernel. The issue still present.

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  Kernel panic after migration between XenServer 6.5 hosts

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Hubba]

>>This appears to be fixed in Xenial (16.04) already. Can you confirm?

Yes, migration of Ubuntu 16.04 4.4.0-21-generic #37 works fine.

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

Commit f0f393877c has not landed in upstream 3.13.y and it is now EOL.
I'll SRU it to Trusty (14.04) for inclusion.

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  Kernel panic after migration between XenServer 6.5 hosts

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

This appears to be fixed in Xenial (16.04) already.  Can you confirm?

d0d15b8 xen/events: Don't move disabled irqs

git describe --contains d0d15b8
Ubuntu-4.4.0-25.44~31


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

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

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

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

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

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

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Hubba]

We have tried patch f0f393877c71ad227d36705d61d1e4062bc29cf5
Seems it's work.

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

The commit indicated by your bisect was introduced into mainline as of 4.6-rc3 
as:
ff1e22e xen/events: Mask a moving irq

It made its way into the 3.19 and 4.4 stable kernels because it was cc'd
to stable.  However, it looks like the regression was already fixed in
4.4.14 per your testing results in comment 18.

This bug should be fixed in the Ubuntu stable kernels shortly, via the
normal stable update process.  I'll take a look at the git logs for
4.4.14 and see if the commit that fixes this bug is obvious.

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

I'll bet this bug was fixed by the following commit, which was cc'd to
stable:

commit f0f393877c71ad227d36705d61d1e4062bc29cf5
Author: Ross Lagerwall 
Date:   Tue May 10 16:11:00 2016 +0100

xen/events: Don't move disabled irqs


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

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

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

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

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

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

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  Kernel panic after migration between XenServer 6.5 hosts

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Hubba]

Bisect result:

cab4604d2bb86315c120630af75a5f012e476596 is the first bad commit
commit cab4604d2bb86315c120630af75a5f012e476596
Author: Boris Ostrovsky 
Date:   Fri Mar 18 10:11:07 2016 -0400

xen/events: Mask a moving irq

BugLink: http://bugs.launchpad.net/bugs/1571034

commit ff1e22e7a638a0782f54f81a6c9cb139aca2da35 upstream.

Moving an unmasked irq may result in irq handler being invoked on both
source and target CPUs.

With 2-level this can happen as follows:

On source CPU:
evtchn_2l_handle_events() ->
generic_handle_irq() ->
handle_edge_irq() ->
   eoi_pirq():
   irq_move_irq(data);

   /* WE ARE HERE */

   if (VALID_EVTCHN(evtchn))
   clear_evtchn(evtchn);

If at this moment target processor is handling an unrelated event in
evtchn_2l_handle_events()'s loop it may pick up our event since target's
cpu_evtchn_mask claims that this event belongs to it *and* the event is
unmasked and still pending. At the same time, source CPU will continue
executing its own handle_edge_irq().

With FIFO interrupt the scenario is similar: irq_move_irq() may result
in a EVTCHNOP_unmask hypercall which, in turn, may make the event
pending on the target CPU.

We can avoid this situation by moving and clearing the event while
keeping event masked.

Signed-off-by: Boris Ostrovsky 
Signed-off-by: David Vrabel 
Signed-off-by: Kamal Mostafa 

:04 04 dcaea6af1e798cf41920479a8ef000f9ecd9edb2
de7990a681d7a717184418adb9a2399fe1f7d0fc M  drivers

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Bogdan]

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

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Hubba]

Installed v4.4.14 xenial kernel on trusty and verified. It works. No
more crashes after migration.

Kernel: 4.4.14-040414-generic
DISTRIB_CODENAME: trusty

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

Would it be possible for you to test the latest upstream stable kernel?
Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the
latest v4.4 stable kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, 
please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as 
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.14-xenial/


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

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Bogdan]

Hello all,

I have probably same issue (freeze on Xenserver 6.5 with timekeeper.c in
backtrace) when unsuspending 14.04 VMs with 3.19 kernels.

To determine latest stable kernel version I've tested following versions
of kernel package:


linux-image-3.19.0-56-generic - Unsuspend works, XenMotion - not tested
linux-image-3.19.0-58-generic - Unsuspend works, XenMotion - works
linux-image-3.19.0-59-generic - Unsuspend causes kernel panic with 
timekeeper.c, Xenmotion - kernel panic 
linux-image-3.19.0-61-generic - Unsuspend causes kernel panic with 
timekeeper.c, Xenmotion - kernel panic 

We have some Ubuntu systems in production with 3.19.0-61 and can't
maintain our hypervisors well because it is not possible neither move
Ubuntu VM out of server nor suspend for maintenance time.

Tested on two pairs of Xenserver systems:

pair#1 - updates up to XS65ESP1023
pair#2 - updates up to XS65ESP1026 and XS65ESP1028


Please, let me know if I can give more information of test some fix.

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Matador]

Installed v4.7-rc3-yakkety kernel on trusty and verified. It works. No
more crashes after migration.

Kernel: 4.7.0-040700rc3-generic
DISTRIB_CODENAME: trusty

** Tags added: kernel-fixed-upstream

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

If this bug is not fixed in mainline, we can bisect between 3.19.0-49
and 3.19.0-61 to find the commit that introduced the regression.

** Tags added: kernel-da-key

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

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Joseph Salisbury]

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.7 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc4-yakkety/

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

** Tags added: needs-bisect regression-update

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Sebastian]

Same on XenServer 7.0 and Ubuntu Kernel 4.4.0-24-generic

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Matador]

apport information

** Tags added: apport-collected trusty

** Description changed:

  Problem: after live migration from one XenServer 6.5 server to another
  XenServer 6.5 the Ubuntu VM crashes (see attached screenshot).
  
  Affected verions (at least):
  1. Ubuntu 14.04 (3.19.0-61-generic)
  2. Ubuntu 16.04 (4.4.0-24-generic)
  
  Not affected versions:
  1.Ubuntu 14.04 (3.19.0-49-generic)
  
  The issue is not dependent on installed XenServer updates.
+ --- 
+ AlsaDevices:
+  total 0
+  crw-rw 1 root audio 116,  1 Jun 16 11:23 seq
+  crw-rw 1 root audio 116, 33 Jun 16 11:23 timer
+ AplayDevices: Error: [Errno 2] No such file or directory
+ ApportVersion: 2.14.1-0ubuntu3.21
+ Architecture: amd64
+ ArecordDevices: Error: [Errno 2] No such file or directory
+ AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
+ CRDA: Error: [Errno 2] No such file or directory
+ CurrentDmesg: [   69.046113] nf_conntrack version 0.5.0 (7868 buckets, 31472 
max)
+ DistroRelease: Ubuntu 14.04
+ HibernationDevice: RESUME=UUID=250f9548-2a14-41c1-bc6e-63199d6e9236
+ InstallationDate: Installed on 2016-02-02 (136 days ago)
+ InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 
(20150805)
+ IwConfig:
+  lono wireless extensions.
+  
+  eth1  no wireless extensions.
+  
+  eth0  no wireless extensions.
+ Lsusb:
+  Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
+  Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+ MachineType: Xen HVM domU
+ Package: linux (not installed)
+ PciMultimedia:
+  
+ ProcFB: 0 EFI VGA
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-61-generic 
root=UUID=5a4cba3d-3be6-4a07-9c55-d5ea7b52585e ro ipv6.disable=1 net.ifnames=0 
biosdevname=0
+ ProcVersionSignature: Ubuntu 3.19.0-61.69~14.04.1-generic 3.19.8-ckt21
+ RelatedPackageVersions:
+  linux-restricted-modules-3.19.0-61-generic N/A
+  linux-backports-modules-3.19.0-61-generic  N/A
+  linux-firmware 1.127.22
+ RfKill: Error: [Errno 2] No such file or directory
+ Tags:  trusty
+ Uname: Linux 3.19.0-61-generic x86_64
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups:
+  
+ WifiSyslog:
+  
+ _MarkForUpload: True
+ dmi.bios.date: 05/11/2016
+ dmi.bios.vendor: Xen
+ dmi.bios.version: 4.4.1-xs125381
+ dmi.chassis.type: 1
+ dmi.chassis.vendor: Xen
+ dmi.modalias: 
dmi:bvnXen:bvr4.4.1-xs125381:bd05/11/2016:svnXen:pnHVMdomU:pvr4.4.1-xs125381:cvnXen:ct1:cvr:
+ dmi.product.name: HVM domU
+ dmi.product.version: 4.4.1-xs125381
+ dmi.sys.vendor: Xen

** Attachment added: "BootDmesg.txt"
   
https://bugs.launchpad.net/bugs/1593621/+attachment/4685616/+files/BootDmesg.txt

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Matador]

** Package changed: ubuntu => linux (Ubuntu)

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[Bug 1593621] Re: Kernel panic after migration between XenServer 6.5 hosts

[Ubuntu Foundations Team Bug Bot]

Thank you for taking the time to report this bug and helping to make
Ubuntu better.  It seems that your bug report is not filed about a
specific source package though, rather it is just filed against Ubuntu
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You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

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** Tags added: bot-comment

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