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

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-hirsute

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https://bugs.launchpad.net/bugs/1928838

Title:
  Fix kernel panic on Intel Bluetooth

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem-5.10 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Won't Fix
Status in linux-oem-5.10 source package in Focal:
  Confirmed
Status in linux source package in Hirsute:
  Fix Committed
Status in linux-oem-5.10 source package in Hirsute:
  Invalid
Status in linux source package in Impish:
  Confirmed
Status in linux-oem-5.10 source package in Impish:
  Invalid

Bug description:
  [Impact]
  Kernel panic when doing rfkill block on Intel Bluetooth controller.

  [Fix]
  Ensure everything is stopped before calling the shutdown callback.

  [Test] 
  Keep pressing the airplane mode button. High chance that a kernel splat
  is shown and Bluetooth becomes unusable.

  [Where problems could occur]
  The shutdown callback is used by other Bluetooth controller as well.
  Logically, the patch is doing the correct thing by queiscing the device
  before calling shutodwn. However, other Bluetooth drivers may depend
  it to behave correctly.

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