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

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-focal

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.13 in Ubuntu.
https://bugs.launchpad.net/bugs/1938689

Title:
  [SRU][H/OEM-5.10/OEM-5.13/U] Fix system hang after unplug tbt dock

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in linux-oem-5.10 package in Ubuntu:
  New
Status in linux-oem-5.13 package in Ubuntu:
  Invalid
Status in linux-oem-5.10 source package in Focal:
  New
Status in linux-oem-5.13 source package in Focal:
  Fix Committed
Status in linux source package in Hirsute:
  Fix Committed
Status in linux source package in Impish:
  Incomplete

Bug description:
  SRU justification:

  [Impact]
  System hang after unplug thunderbolt dock with Intel igc lan.

  [Fix]
  igc driver continue reading and writing MMIO address after PCI device is 
unplugged.
  This cause system page fault, and system hang.
  Add safe check and prevent reading and writing the MMIO.

  The patch is in maintainer's tree, but not merged to Linus's tree.
  Due to the schedule, send SRU as SAUCE patch.

  [Test]
  Verified on hardware, after unplug the thunderbolt cable,
  system work fine.

  [Where problems could occur]
  It may break the igc driver.

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