On 5 Feb 2019, at 7:10, Cristian Marussi wrote:
Hi Ben
On 05/02/2019 11:53, Benjamin Coddington wrote:
Hello Cristian and Punit,
Did you ever get to the bottom of this one? We just saw this on one
run
of our 4.18.0-era ppc64le, and I'm wondering if we ever found the
root
cause.
unfortunately I stopped working actively on finding the root cause,
since I've
found a viable workaround that let us unblock our broken LTP runs.
Setting wsize=65536 in NFS bootparams completely solves the issue with
64k pages
(and does NOT break 4k either :D): this confirmed my hyp that there is
some sort
of race when accounting refcounts during the lifetime of nfs_page
structs which
leads to a misscounted refcount...but as I said I never looked back
into that
again (but never say never...)
Hope this helps...
Hmm, interesting..
Will you share your reproducer with me? That will save me some time.
Ben
