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 1922738
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
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https://bugs.launchpad.net/bugs/1922738
Title:
5.4 kernel: when iommu is on crashdump fails
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Focal:
Confirmed
Bug description:
[IMPACT]
When iommu is enabled crashdump fails to be collected because crash-kernel
crashes
with following trace [1].
Commits that address it :
1ddb32da4a62 iommu/vt-d: Simplify check in identity_mapping()
96d170f3b1a6 iommu/vt-d: Remove deferred_attach_domain()
a11bfde9c77d iommu/vt-d: Do deferred attachment in iommu_need_mapping()
034d98cc0cdc iommu/vt-d: Move deferred device attachment into helper function
1d4615978f52 iommu/vt-d: Add attach_deferred() helper
1ee0186b9a12 iommu/vt-d: Refactor find_domain() helper
[TEST CASE]
Install a 5.4 kernel, add intel_iommu=on and iommu=pt to grub cmdline
and trigger a crash.
The crash kernel that boots will crash with trace [1].
[REGRESSION POTENTIAL]
[OTHER]
Kernel affected 5.4.
[1] https://pastebin.ubuntu.com/p/FNxTxjg3DV/
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