Description:
References:
 https://source.android.com/security/bulletin/pixel/2022-08-01
 https://android.googlesource.com/kernel/common/+/69e8f03c5ced3e4e6fb4181f4dac185104e3420b
 https://android.googlesource.com/kernel/common/+/80d91b86a199798ee2321a0ab0f09e6e12764678
 https://lore.kernel.org/all/420a6c4a-e526-4e8b-d5bd-563c40aa94e1@huaweicloud.com/
 https://lore.kernel.org/all/YvYAmmaJgvydex4p@google.com/
Notes:
 carnil> The second commit is 0b3ea0926afb ("fs: explicitly unregister
 carnil> per-superblock BDIs") in 5.16-rc1.
 carnil> Is this an Android specific issue? 5.16-rc1 contains as well
 carnil> 702f2d1e3b33 ("mm: don't automatically unregister bdis") as
 carnil> "All BDI users now unregister explicitly" at that point.
 carnil> Lee Jones clarified that the issue is specific to Android
 carnil> released kernel versions which had an internal, device specific
 carnil> commit, causing the issue. This does not affect upstream or
 carnil> stable kernels accordingly.
Bugs:
upstream: N/A "Vulnerable code not present; issue specific to Android kernel"
5.10-upstream-stable: N/A "Vulnerable code not present; issue specific to Android kernel"
4.19-upstream-stable: N/A "Vulnerable code not present; issue specific to Android kernel"
sid: N/A "Vulnerable code not present; issue specific to Android kernel"
5.10-bullseye-security: N/A "Vulnerable code not present; issue specific to Android kernel"
4.19-buster-security: N/A "Vulnerable code not present; issue specific to Android kernel"