Public bug reported:
== SRU Justification ==
Impact: While reviewing patches done as part of stable work there were
two changes which came from linux-4.19.y and seemed not quite right for
the 4.15 kernel version we have in 18.04/Bionic:
2e1eb7b6e1e0 locking/mutex: clear MUTEX_FLAGS if wait_list is empty due
to signal
This change is only in 4.19y and not in 4.14.y despite it is implied
that the breaking commit was already in 3.13. It also seems to pair up
with a mode of mutex which only got added to 4.19. Although there were
no reports yet, which could prove this wrong, it feels like we rather
should not take this change without a case where the current code is
reported to be wrong.
6c0065eb69de drm/amd/amdgpu: fix refcount leak
The driver in 4.15 does take refcounts the same way as 4.19 does. We are
missing 37ac3dc00da0 ("drm/amdgpu: Use device specific BO size & stride
check.") which changed that. So we really should revert this one.
Testing: These are proactive reverts, so there is no real test that
could be done. However this just moves back to a state which we had
before. And for that state we had no bug reports.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Bionic)
Importance: Medium
Status: Triaged
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Bionic)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1938537
Title:
Potential reverts of 4.19.y stable changes in 18.04
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