This bug is awaiting verification that the linux-oem-6.11/6.11.0-1023.23
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-noble-linux-oem-6.11' to 'verification-done-
noble-linux-oem-6.11'. If the problem still exists, change the tag
'verification-needed-noble-linux-oem-6.11' to 'verification-failed-
noble-linux-oem-6.11'.


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: kernel-spammed-noble-linux-oem-6.11-v2 
verification-needed-noble-linux-oem-6.11

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https://bugs.launchpad.net/bugs/2106923

Title:
  Fix divide by zero errors in DML2

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Invalid
Status in linux-oem-6.11 package in Ubuntu:
  Invalid
Status in linux source package in Noble:
  Invalid
Status in linux-oem-6.11 source package in Noble:
  Fix Committed
Status in linux source package in Plucky:
  In Progress
Status in linux-oem-6.11 source package in Plucky:
  Invalid

Bug description:
  [Impact]
  Random crashes have been reported on GPUs that use DML2 (Ryzen AI APUs and 
Radeon 9000 dGPU). The crashes are root caused to corruption in registers used 
for floating point code.

  [Fix]
  They are caused by a lack of FP context protection around that code. They are 
fixed by these 3 commits:

  
https://github.com/torvalds/linux/commit/afcdf51d97cd58dd7a2e0aa8acbaea5108fa6826
  
https://github.com/torvalds/linux/commit/366e77cd4923c3aa45341e15dcaf3377af9b042f
  
https://github.com/torvalds/linux/commit/4408b59eeacfea777aae397177f49748cadde5ce

  [Test]
  1. Install ubuntu with 6.11 kernel on AMD platform
  2. Run reboot test around 300 times
  3. The system should not hang while booting up

  [Where problems could occur]
  The 3 commits are straightforward for the protection, and didn't involve any 
functional changes.

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