[OpenAFS] some older openafs-client versions have started failing

[Benjamin Kaduk]

On Sat, 16 Jul 2016, Mark Vitale wrote:

>
> On Jul 15, 2016, at 10:39 PM, Chad William Seys <cwseys@physics.wisc.edu> wrote:
> >  I found the break point in when openafs starts having problems with git checkout on my test repo:
> >
> > First broken: 3.16.7-ckt25-1        (compiled 2016-03-06)
> > Last working: 3.16.7-ckt20-1+deb8u4
> >
> > Here is a changelog in case someone knows what to hunt for in:
> > http://metadata.ftp-master.debian.org/changelogs//main/l/linux/linux_3.16.7-ckt25-2_changelog
>
> thank you, this was very helpful.  It's almost certainly:
>
>     - vfs: Make sendfile(2) killable even better
>     - vfs: Avoid softlockups with sendfile(2)
>
> which are backports from Linux 4.4.  OpenAFS had to disable splice() support to be able to tolerate these changes.  You need OpenAFS 1.6.18 or higher to obtain relief for this, and indeed you did report that 1.6.18 is working fine for you at this kernel level.
>
> However, this does NOT explain your report of no problems with OpenAFS 1.6.17 and 1.6.16.

Actually, it does -- debian's 1.6.17-2 contains:
debian/patches/Linux-4.4-Do-not-use-splice.patch
which is what made it into upstream openafs 1.6.18.

-Ben