CIFS: Request for backport

[Marcelo Cerri]

[Impact]

Microsoft CIFS team requested below patches to be backported (it was marked for stable last month) to Ubuntu 18.04 and newer.

6988a619f5b7 "cifs: allow syscalls to be restarted in __smb_send_rqst()"
2659d3bff3e1 "cifs: fix interrupted close commands"
214a5ea081e7 "cifs: do not fail __smb_send_rqst if non-fatal signals are pending"

Since 6988a619f5b79e4efadea6e19dcfe75fbcd350b5 hasn't been picked up for 5.4.0-1031-azure (the current 18.04 kernel version for Azure image), I would like make a request for backport.

[Test Case]

Since those are small improvements a basic smoke test can be used to avoid regressions:

1. Install cifs-utils and dbench:

  $ sudo apt-get install cifs-utils dbench

2. Mount a CIFS share using:

   $ sudo mount -t cifs -o username=REMOTEUSER \\remoteip\path\to\shared\folder /mnt

3. Run dbench and check for regressions:

   $ cd /mnt; dbench 20 -t 120 -D .

[Where problems could occur]

The regression potential is restricted to the ability of mounting and accessing CIFS volumes.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1911438

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.

[Marcelo Cerri (mhcerri)]

5.8 already has the fixes.

[Marcelo Cerri (mhcerri)]

SRU submission:

https://lists.ubuntu.com/archives/kernel-team/2021-January/116766.html
https://lists.ubuntu.com/archives/kernel-team/2021-January/116767.html
https://lists.ubuntu.com/archives/kernel-team/2021-January/116768.html

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-azure - 5.4.0-1040.42

---------------
linux-azure (5.4.0-1040.42) focal; urgency=medium

  * focal/linux-azure: 5.4.0-1040.42 -proposed tracker (LP: #1913138)

  * Focal update: v5.4.80 upstream stable release (LP: #1908561)
    - [Config] azure: updateconfigs for INFINIBAND_VIRT_DMA

  * Focal update: v5.4.84 upstream stable release (LP: #1910816)
    - [Config] azure: updateconfigs for PGTABLE_MAPPING

  * CIFS: Request for backport (LP: #1911438)
    - cifs: fix interrupted close commands
    - cifs: do not fail __smb_send_rqst if non-fatal signals are pending

  * Sync FSGSBASE patches in azure kernel with mainline (LP: #1913294)
    - x86/process/64: Make save_fsgs_for_kvm() ready for FSGSBASE
    - x86/entry/64: Do not use RDPID in paranoid entry to accomodate KVM

  * Revert or drop obsolete patches for PCI (LP: #1911205)
    - Revert "UBUNTU: SAUCE: pci-hyperv: Use only 16 bit integer for PCI domain"
    - Revert "Revert "PCI: hv: Make sure the bus domain is really unique""

  * Disable Atari partition support for cloud kernels (LP: #1908264)
    - [Config] azure: Disable ATARI_PARTITION

  * Enable boot from NVMe device for all images (LP: #1908571)
    - [Config] azure: CONFIG_PCI_HYPERV=y

  [ Ubuntu: 5.4.0-66.74 ]

  * focal/linux: 5.4.0-66.74 -proposed tracker (LP: #1913152)
  * Add support for selective build of special drivers (LP: #1912789)
    - [Packaging] Add support for ODM drivers
    - [Packaging] Turn on ODM support for amd64
  * Packaging resync (LP: #1786013)
    - update dkms package versions
    - update dkms package versions
  * Introduce the new NVIDIA 460-server series and update the 460 series
    (LP: #1913200)
    - [Config] dkms-versions -- drop NVIDIA 435 455 and 440-server
    - [Config] dkms-versions -- add the 460-server nvidia driver
  * Enable mute and micmute LED on HP EliteBook 850 G7 (LP: #1910102)
    - ALSA: hda/realtek: Enable mute and micmute LED on HP EliteBook 850 G7
  * SYNA30B4:00 06CB:CE09 Mouse on HP EliteBook 850 G7 not working at all
    (LP: #1908992)
    - HID: multitouch: Enable multi-input for Synaptics pointstick/touchpad device
  * HD Audio Device PCI ID for the Intel Cometlake-R platform (LP: #1912427)
    - SAUCE: ALSA: hda: Add Cometlake-R PCI ID
  * switch to an autogenerated nvidia series based core via dkms-versions
    (LP: #1912803)
    - [Packaging] nvidia -- use dkms-versions to define versions built
    - [Packaging] update-version-dkms -- maintain flags fields
    - [Config] dkms-versions -- add transitional/skip information for nvidia
      packages
  * udpgro.sh in net from ubuntu_kernel_selftests seems not reflecting sub-test
    result (LP: #1908499)
    - selftests: fix the return value for UDP GRO test
  * qede: Kubernetes Internal DNS Failure due to QL41xxx NIC not supporting IPIP
    tx csum offload (LP: #1909062)
    - qede: fix offload for IPIP tunnel packets
  * Use DCPD to control HP DreamColor panel (LP: #1911001)
    - SAUCE: drm/dp: Another HP DreamColor panel brigntness fix
  * kvm: Windows 2k19 with Hyper-v role gets stuck on pending hypervisor
    requests on cascadelake based kvm hosts (LP: #1911848)
    - KVM:...