Re: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2

Tyler W. Ross
2025-11-14T05:09:19Z

On Thursday, November 13th, 2025 at 9:35 PM, Tyler W. Ross <TWR@tylerwross.com> wrote:

> I tried a couple vanilla/stock kernels today, without success.
>
> Most notably, I built 6.17.8 from upstream using the Kconfig from the
> working Fedora 43 client in my lab ("config-6.17.5-300.fc43.x86_64").
>
> Unfortunately, the rpc_xdr_overflow still occurs with this kernel.

Quick addendum:

I had not tried Debian 12, because CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA2
was not enabled in the shipped Kconfig.

I just spun up a Debian 12 VM and installed the aforementioned
upstream 6.17.8 with Fedora 43 Kconfig kernel and confirmed the issue
also occurs on Debian 12.

TWR