Public bug reported:
[Impact]
Scary kernel splat about RCU can be observed everytime laptop resumes
from suspend.
[Fix]
Use non-atomic notifier for power supply change to relax the constraint.
[Test]
Once the fix is applied, no more RCU warning can be found after several
suspend/resume cycle.
[Where problems could occur]
Essentially no regression potential. Atomic notifier should be used by
core kernel, and things like power supply doesn't need to be atomic
anyway.
** Affects: linux (Ubuntu)
Importance: Low
Status: Confirmed
** Affects: linux-oem-6.1 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-6.5 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: Won't Fix
** Affects: linux-oem-6.1 (Ubuntu Jammy)
Importance: Low
Status: Confirmed
** Affects: linux-oem-6.5 (Ubuntu Jammy)
Importance: Low
Status: Confirmed
** Affects: linux (Ubuntu Lunar)
Importance: Low
Status: Confirmed
** Affects: linux-oem-6.1 (Ubuntu Lunar)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-6.5 (Ubuntu Lunar)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Mantic)
Importance: Low
Status: Confirmed
** Affects: linux-oem-6.1 (Ubuntu Mantic)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-6.5 (Ubuntu Mantic)
Importance: Undecided
Status: Invalid
** Also affects: linux-oem-6.5 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.1 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.1 (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.5 (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Jammy)
Status: New => Won't Fix
** Changed in: linux-oem-6.1 (Ubuntu Jammy)
Status: New => Confirmed
** Changed in: linux-oem-6.5 (Ubuntu Jammy)
Status: New => Confirmed
** Changed in: linux-oem-6.5 (Ubuntu Jammy)
Importance: Undecided => Low
** Changed in: linux-oem-6.1 (Ubuntu Jammy)
Importance: Undecided => Low
** Changed in: linux-oem-6.1 (Ubuntu)
Status: New => Invalid
** Changed in: linux-oem-6.5 (Ubuntu)
Status: New => Opinion
** Changed in: linux-oem-6.5 (Ubuntu)
Status: Opinion => Invalid
** Also affects: linux (Ubuntu Lunar)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.1 (Ubuntu Lunar)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.5 (Ubuntu Lunar)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Lunar)
Status: New => Confirmed
** Changed in: linux (Ubuntu Lunar)
Importance: Undecided => Low
** Changed in: linux-oem-6.1 (Ubuntu Lunar)
Status: New => Invalid
** Changed in: linux-oem-6.5 (Ubuntu Lunar)
Status: New => Invalid
** Also affects: linux (Ubuntu Mantic)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.1 (Ubuntu Mantic)
Importance: Undecided
Status: Invalid
** Also affects: linux-oem-6.5 (Ubuntu Mantic)
Importance: Undecided
Status: Invalid
** Changed in: linux (Ubuntu Mantic)
Importance: Undecided => Low
** Changed in: linux (Ubuntu Mantic)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2036377
Title:
Fix RCU warning on AMD laptops
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux-oem-6.5 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Won't Fix
Status in linux-oem-6.1 source package in Jammy:
Confirmed
Status in linux-oem-6.5 source package in Jammy:
Confirmed
Status in linux source package in Lunar:
Confirmed
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux-oem-6.5 source package in Lunar:
Invalid
Status in linux source package in Mantic:
Confirmed
Status in linux-oem-6.1 source package in Mantic:
Invalid
Status in linux-oem-6.5 source package in Mantic:
Invalid
Bug description:
[Impact]
Scary kernel splat about RCU can be observed everytime laptop resumes
from suspend.
[Fix]
Use non-atomic notifier for power supply change to relax the constraint.
[Test]
Once the fix is applied, no more RCU warning can be found after several
suspend/resume cycle.
[Where problems could occur]
Essentially no regression potential. Atomic notifier should be used by
core kernel, and things like power supply doesn't need to be atomic
anyway.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2036377/+subscriptions
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