[Hyper-V] mkfs regression in 4.10 fixed by patch in "for-4.11"

Bug #1657539 reported by Joshua R. Poulson on 2017-01-18
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Tim Gardner
Tim Gardner

Bug Description

Linux-next testing with upstream identified a regression with mkfs operations based on an uptream patch accepted into Linus's tree. Please consider this commit that corrects the regression:


Ming Lei <email address hidden>
2016-12-17 10:49:09 (GMT)
Jens Axboe <email address hidden>
2017-01-12 03:47:08 (GMT)
729204ef49ec00b788ce23deb9eb922a5769f55d (patch)
1661f2e21c8bbf922dcb76faf2126a33ffe4cddb (diff)
block: relax check on sg gap
If the last bvec of the 1st bio and the 1st bvec of the next
bio are physically contigious, and the latter can be merged
to last segment of the 1st bio, we should think they don't
violate sg gap(or virt boundary) limit.

Both Vitaly and Dexuan reported lots of unmergeable small bios
are observed when running mkfs on Hyper-V virtual storage, and
performance becomes quite low. This patch fixes that performance

The same issue should exist on NVMe, since it sets virt boundary too.

Reported-by: Vitaly Kuznetsov <email address hidden>
Reported-by: Dexuan Cui <email address hidden>
Tested-by: Dexuan Cui <email address hidden>
Cc: Keith Busch <email address hidden>
Signed-off-by: Ming Lei <email address hidden>
Signed-off-by: Jens Axboe <email address hidden>

CVE References

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1657539

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Joshua R. Poulson (jrp) wrote :

No log files, request to include upstream commit.

Changed in linux (Ubuntu):
status: Incomplete → Confirmed
Joseph Salisbury (jsalisbury) wrote :

The Zesty kernel is still at 4.9. We can request this commit in Zesty when it is rebased to 4.10.

Changed in linux (Ubuntu):
importance: Undecided → Medium
tags: added: kernel-da-key kernel-hyper-v zesty
Changed in linux (Ubuntu Zesty):
status: Confirmed → Triaged
Tim Gardner (timg-tpi) wrote :

Applied to unstable (which will eventually become Zesty)

Changed in linux (Ubuntu Zesty):
assignee: nobody → Tim Gardner (timg-tpi)
status: Triaged → Fix Committed
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux - 4.10.0-8.10

linux (4.10.0-8.10) zesty; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1664217

  * [Hyper-V] Bug fixes for storvsc (tagged queuing, error conditions)
    (LP: #1663687)
    - scsi: storvsc: Enable tracking of queue depth
    - scsi: storvsc: Remove the restriction on max segment size
    - scsi: storvsc: Enable multi-queue support
    - scsi: storvsc: use tagged SRB requests if supported by the device
    - scsi: storvsc: properly handle SRB_ERROR when sense message is present
    - scsi: storvsc: properly set residual data length on errors

  * Ubuntu16.10-KVM:Big configuration with multiple guests running SRIOV VFs
    caused KVM host hung and all KVM guests down. (LP: #1651248)
    - KVM: PPC: Book 3S: XICS cleanup: remove XICS_RM_REJECT
    - KVM: PPC: Book 3S: XICS: correct the real mode ICP rejecting counter
    - KVM: PPC: Book 3S: XICS: Fix potential issue with duplicate IRQ resends
    - KVM: PPC: Book 3S: XICS: Implement ICS P/Q states
    - KVM: PPC: Book 3S: XICS: Don't lock twice when checking for resend

  * overlay: mkdir fails if directory exists in lowerdir in a user namespace
    (LP: #1531747)
    - SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs

  * CVE-2016-1575 (LP: #1534961)
    - SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs

  * CVE-2016-1576 (LP: #1535150)
    - SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs

  * Miscellaneous Ubuntu changes
    - SAUCE: md/raid6 algorithms: scale test duration for speedier boots
    - SAUCE: Import aufs driver
    - d-i: Build message-modules udeb for arm64
    - rebase to v4.10-rc8

  * Miscellaneous upstream changes
    - Revert "UBUNTU: SAUCE: aufs -- remove .readlink assignment"
    - Revert "UBUNTU: SAUCE: (no-up) aufs: for v4.9-rc1, support setattr_prepare()"
    - Revert "UBUNTU: SAUCE: aufs -- Add flags argument to aufs_rename()"
    - Revert "UBUNTU: SAUCE: aufs -- Convert to use xattr handlers"
    - Revert "UBUNTU: SAUCE: Import aufs driver"

  [ Upstream Kernel Changes ]

  * rebase to v4.10-rc8

 -- Tim Gardner <email address hidden> Mon, 06 Feb 2017 08:34:24 -0700

Changed in linux (Ubuntu Zesty):
status: Fix Committed → Fix Released
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