On Tue, 13 Aug 2024, Michael Ellerman wrote:

Niklas Cassel [off-list ref] writes:

quoted

Hello Jonáš, Kolbjørn,

thank you for the report.

On Tue, Aug 13, 2024 at 07:49:34AM +0200, Jonáš Vidra wrote:

quoted

On Tue 13. Aug 2024 0:32:37 CEST, Kolbjørn Barmen wrote:

quoted

Ever since 6.10, my macmini G4 behaved unstable when dealing with lots of
I/O activity, such as sync'ing of Gentoo portage tree, unpacking kernel
source tarball, building large software packages (or kernel) etc.

After a bit of testing, and patient kernel rebuilding (while crashing) I
found the cuplit to be this commit/change

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/diff/?id=09fe2bfa6b83f865126ce3964744863f69a4a030

I've been able to reproduce this pata_macio bug on a desktop PowerMac G4
with the 6.10.3 kernel version. Reverting the linked change
("ata: pata_macio: Fix max_segment_size with PAGE_SIZE == 64K") makes
the errors go away.

Michael, as the author of the this commit, could you please look into
this issue?

I can. My commit was really just working around the warning in the SCSI
core which appeared after afd53a3d8528, it was supposed to just fix the
warning without changing behaviour. Though obviously it did for 4KB
PAGE_SIZE kernels.

I don't have easy access to my mac-mini so it would be helpful if you
can test changes Jonáš and/or Kolbjørn.

I applied your patch (to 6.10.4 sources) and built a kernel, and did some stress
testing (tarring adnd untarring large archives) and so far it looks good.


Thanks! :)


-- kolla