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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1976248
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
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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/1976248
Title:
Revert PPC get_user workaround
Status in linux package in Ubuntu:
In Progress
Status in zfs-linux package in Ubuntu:
New
Bug description:
[Impact]
* A change of kernel symbol license allows to drop a PPC specific
workaround in zfs-dkms to use the regular (better) code paths.
* See details in:
https://git.launchpad.net/ubuntu/+source/zfs-
linux/tree/debian/patches/4900-ppc-get-user-workaround.patch
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1009242
[Test Plan]
* linux: apply
https://github.com/torvalds/linux/commit/d9e5c3e9e75162f845880535957b7fd0b4637d23
* zfs-dkms: revert https://git.launchpad.net/ubuntu/+source/zfs-
linux/tree/debian/patches/4900-ppc-get-user-workaround.patch
* Build on kernel with zfs module on ppc
* Ensure that zfs.ko successfully loads and works
* Test that root on zfs installations work on ppc (however, Ubuntu
currently doesn't provide an installation method to achieve this, so
this bit of verification might be hard to complete)
[Where problems could occur]
* linux: the patch only changes the symbol licensing and the
potential tainteness status of the kernel, without any observable user
or kernel space impacts
* zfs-dkms: The PPC workaround patch is known to be buggy, and the
new arch-independent codepath may now use optimized codepaths inside
kernel resulting in a different behavior as observed by user-space
(operation successful, EFAULT not returned) matching the behavior of
all other architectures.
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