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... Regards Cristian > > Ben >
