[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Frank Heimes]

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

** Changed in: ubuntu-power-systems
   Status: Fix Committed => Fix Released

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Title:
  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.4.0-103.126

---
linux (4.4.0-103.126) xenial; urgency=low

  * linux: 4.4.0-103.126 -proposed tracker (LP: #1736181)

  * CVE-2017-1000405
- mm, thp: Do not make page table dirty unconditionally in touch_p[mu]d()

  * CVE-2017-16939
- netlink: add a start callback for starting a netlink dump
- ipsec: Fix aborted xfrm policy dump crash

linux (4.4.0-102.125) xenial; urgency=low

  * linux: 4.4.0-102.125 -proposed tracker (LP: #1733541)

  * tar -x sometimes fails on overlayfs (LP: #1728489)
- ovl: check if all layers are on the same fs
- ovl: persistent inode number for directories

  * NVMe timeout is too short (LP: #1729119)
- nvme: update timeout module parameter type

  * Set PANIC_TIMEOUT=10 on Power Systems (LP: #1730660)
- [Config]: Set PANIC_TIMEOUT=10 on ppc64el

  * Cannot pair BLE remote devices when using combo BT SoC (LP: #1731467)
- Bluetooth: increase timeout for le auto connections

  * CIFS errors on 4.4.0-98, but not on 4.4.0-97 with same config (LP: #1729337)
- SMB3: Validate negotiate request must always be signed

  * Plantronics P610 does not support sample rate reading (LP: #1719853)
- ALSA: usb-audio: Add sample rate quirk for Plantronics P610

  * Invalid btree pointer causes the kernel NULL pointer dereference
(LP: #1729256)
- xfs: reinit btree pointer on attr tree inactivation walk

  * Samba mount/umount in docker container triggers kernel Oops (LP: #1729637)
- ipv6: only call ip6_route_dev_notify() once for NETDEV_UNREGISTER
- ipv6: fix NULL dereference in ip6_route_dev_notify()

  * [kernel] tty/hvc: Use opal irqchip interface if available (LP: #1728098)
- tty/hvc: Use opal irqchip interface if available

  * Device hotplugging with MPT SAS cannot work for VMWare ESXi (LP: #1730852)
- scsi: mptsas: Fixup device hotplug for VMWare ESXi

  * NMI watchdog: BUG: soft lockup on Guest upon boot (KVM) (LP: #1727331)
- KVM: PPC: Book3S: Treat VTB as a per-subcore register, not per-thread

  * Attempt to map rbd image from ceph jewel/luminous hangs (LP: #1728739)
- crush: ensure bucket id is valid before indexing buckets array
- crush: ensure take bucket value is valid
- crush: add chooseleaf_stable tunable
- crush: decode and initialize chooseleaf_stable
- libceph: advertise support for TUNABLES5
- libceph: MOSDOpReply v7 encoding

  * Xenial update to 4.4.98 stable release (LP: #1732698)
- adv7604: Initialize drive strength to default when using DT
- video: fbdev: pmag-ba-fb: Remove bad `__init' annotation
- PCI: mvebu: Handle changes to the bridge windows while enabled
- xen/netback: set default upper limit of tx/rx queues to 8
- drm: drm_minor_register(): Clean up debugfs on failure
- KVM: PPC: Book 3S: XICS: correct the real mode ICP rejecting counter
- iommu/arm-smmu-v3: Clear prior settings when updating STEs
- powerpc/corenet: explicitly disable the SDHC controller on kmcoge4
- ARM: omap2plus_defconfig: Fix probe errors on UARTs 5 and 6
- crypto: vmx - disable preemption to enable vsx in aes_ctr.c
- iio: trigger: free trigger resource correctly
- phy: increase size of MII_BUS_ID_SIZE and bus_id
- serial: sh-sci: Fix register offsets for the IRDA serial port
- usb: hcd: initialize hcd->flags to 0 when rm hcd
- netfilter: nft_meta: deal with PACKET_LOOPBACK in netdev family
- IPsec: do not ignore crypto err in ah4 input
- Input: mpr121 - handle multiple bits change of status register
- Input: mpr121 - set missing event capability
- IB/ipoib: Change list_del to list_del_init in the tx object
- s390/qeth: issue STARTLAN as first IPA command
- (config) Add NET_DSA=n
- net: dsa: select NET_SWITCHDEV
- platform/x86: hp-wmi: Fix detection for dock and tablet mode
- cdc_ncm: Set NTB format again after altsetting switch for Huawei devices
- KEYS: trusted: sanitize all key material
- KEYS: trusted: fix writing past end of buffer in trusted_read()
- platform/x86: hp-wmi: Fix error value for hp_wmi_tablet_state
- platform/x86: hp-wmi: Do not shadow error values
- x86/uaccess, sched/preempt: Verify access_ok() context
- workqueue: Fix NULL pointer dereference
- crypto: x86/sha1-mb - fix panic due to unaligned access
- KEYS: fix NULL pointer dereference during ASN.1 parsing [ver #2]
- ARM: 8720/1: ensure dump_instr() checks addr_limit
- ALSA: seq: Fix OSS sysex delivery in OSS emulation
- ALSA: seq: Avoid invalid lockdep class warning
- MIPS: microMIPS: Fix incorrect mask in insn_table_MM
- MIPS: Fix CM region target definitions
- MIPS: SMP: Use a completion event to signal CPU up
- MIPS: Fix race on setting and getting cpu_online_mask
- MIPS: SMP: Fix deadlock & online race
- test: firmware_class: report errors properly on failure
- selftests: firmware: add empty string and async 

[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[bugproxy]

--- Comment From rahch...@in.ibm.com 2017-11-30 14:02 EDT---
I have verified the fix on xenial.

Linux neo160.blr.stglabs.ibm.com 4.4.0-102-generic #125-Ubuntu SMP Tue
Nov 21 15:13:58 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

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

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Title:
  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Khaled El Mously]

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-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verification-needed-xenial' to 'verification-failed-
xenial'.

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-xenial

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Title:
  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Joseph Salisbury]

The fix is in the -proposed repository.  It will be released with the
Ubuntu-4.4.0-102.125 kernel.

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

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Title:
  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Manoj Iyer]

** Changed in: ubuntu-power-systems
   Status: In Progress => Fix Committed

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Title:
  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Stefan Bader]

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

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Title:
  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Joseph Salisbury]

Mailing list thread for SRU request:
https://lists.ubuntu.com/archives/kernel-team/2017-November/088038.html

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  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Manoj Iyer]

** Tags added: triage-g

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Title:
  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Joseph Salisbury]

** Description changed:

+ == SRU Justification ==
+ Xenial does not include the patch:
+ "KVM: PPC: Book3S: Treat VTB as a per-subcore register, not per-thread",
+ which is commit 88b02cf97bb7 in the upstream Linux kernel repository. The
+ symptom of not having this patch is that guests running with threads > 1
+ (that is, in SMT2, SMT4 or SMT8 mode) can give spurious soft-lockup messages 
+ when they are not in fact locked up, if the guest kernel uses the VTB
+ (virtual timebase) register in its softlockup detector code.
+ 
+ IBM provided this backport of commit 88b02cf97bb7.
+ 
+ == Fix ==
+ commit 88b02cf97bb7e742db3e31671d54177e3e19fd89
+ Author: Paul Mackerras 
+ Date:   Thu Sep 15 13:42:52 2016 +1000
+ 
+ KVM: PPC: Book3S: Treat VTB as a per-subcore register, not per-
+ thread
+ 
+ == Regression Potential ==
+ This patch is specific to powerpc.  It was provided by and tested by IBM.
+ 
+ 
+ 
  Environment:
  Host OS: Ubuntu 16.04 (4.4.0-97-generic)
- Guest OS: Ubuntu 16.04 
+ Guest OS: Ubuntu 16.04
  
  Host is running NovaLink and GPFS.  Guest gets filesystem from gpfs
  cluster.
  
  Issue:
  
  While booting the guest OS went into recovery.  dmesg shows CPU soft
  lockup.  This issue is easily recreatable when multiple VMs (about 10)
  are being started simultaneously.
  
  
...
  
-  - Paul Mackerras  - 2017-10-24 00:42:25 ==
+  - Paul Mackerras  - 2017-10-24 00:42:25 ==
  
  Looking at kernel sources:
  
  The Ubuntu host kernel (4.4.0-97) does not include the patch "KVM: PPC:
  Book3S: Treat VTB as a per-subcore register, not per-thread", which is
  commit 88b02cf97bb7 in the upstream Linux kernel repository.  The
  symptom of not having this patch is that guests running with threads > 1
  (that is, in SMT2, SMT4 or SMT8 mode) can give spurious soft-lockup
  messages when they are not in fact locked up, if the guest kernel uses
  the VTB (virtual timebase) register in its softlockup detector code.
  
  This is a backport of commit 88b02cf97bb7 from the upstream Linux kernel
  repository to the Ubuntu 4.4 kernel. It is the fix for the problem of
  seeing spurious soft lockup messages in guests running in an SMT mode
  greater than 1.
  
  These tests were run on a system with 20 cores.  Each VM had 1 core and 4 
threads (SMT=4).
  It is working very well with this patch

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Joseph Salisbury]

I built a Xenial test kernel with the back port of commit 88b02cf97bb7
posted in comment #1.  The test kernel can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1727331/

Can you test this kernel and see if it resolves this bug?  Be sure to
install both the linux-image and linux-image-extra .deb packages.

If this kernel resolves the bug, I'll submit an SRU request for
inclusion in Xenial.

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Frank Heimes]

** Changed in: ubuntu-power-systems
   Status: Triaged => In Progress

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Joseph Salisbury]

** 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 => Critical

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

** Changed in: linux (Ubuntu)
 Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => 
Joseph Salisbury (jsalisbury)

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

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  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Frank Heimes]

** Changed in: ubuntu-power-systems
   Status: New => Triaged

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Joseph Salisbury]

Do you need me to build a test kernel with this backport and submit and
SRU request for Xenial?  Or do you plan on doing that?

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

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

** Tags added: kernel-da-key

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  NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

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[Bug 1727331] Re: NMI watchdog: BUG: soft lockup on Guest upon boot (KVM)

[Frank Heimes]

** Package changed: kernel-package (Ubuntu) => linux (Ubuntu)

** Also affects: ubuntu-power-systems
   Importance: Undecided
   Status: New

** Changed in: ubuntu-power-systems
   Importance: Undecided => Critical

** Changed in: ubuntu-power-systems
 Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

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