Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2
- To: "Tyler W. Ross" <TWR@tylerwross.com>
- Cc: Salvatore Bonaccorso <carnil@debian.org>, "1120598@bugs.debian.org" <1120598@bugs.debian.org>, Jeff Layton <jlayton@kernel.org>, NeilBrown <neil@brown.name>, Scott Mayhew <smayhew@redhat.com>, Steve Dickson <steved@redhat.com>, Olga Kornievskaia <okorniev@redhat.com>, Dai Ngo <Dai.Ngo@oracle.com>, Tom Talpey <tom@talpey.com>, Trond Myklebust <trondmy@kernel.org>, Anna Schumaker <anna@kernel.org>, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org
- Subject: Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2
- From: Chuck Lever <chuck.lever@oracle.com>
- Date: Fri, 14 Nov 2025 09:18:34 -0500
- Message-id: <[🔎] a6d1435b-f507-49eb-b80c-4322dc7e1157@oracle.com>
- Reply-to: Chuck Lever <chuck.lever@oracle.com>, 1120598@bugs.debian.org
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- References: <[🔎] 176298368872.955.14091113173156448257.reportbug@nfsclient-sid.ipa.twrlab.net> <[🔎] aRVl8yGqTkyaWxPM@eldamar.lan> <[🔎] 8d873978-2df6-4b79-891d-f0fd78485551@oracle.com> <[🔎] c8-cRKuS2KXjk19lBwOGLCt21IbVv7HsS-V-ihDmhQ1Uae_LHNm83T0dOKvbYqsf4AeP5T8PR_xdiKLj5-Nvec-QVTLqIC4NGuU2FA0hN5U=@tylerwross.com> <[🔎] c7136bad-5a00-4224-a25c-0cf7e8252f4a@oracle.com> <[🔎] aRZL8kbmfbssOwKF@eldamar.lan> <[🔎] 1cee1c3e-e6b9-485a-a4d4-c336072f14c3@oracle.com> <[🔎] aRZZoNB5rsC8QUi4@eldamar.lan> <[🔎] de44bf50-0c87-4062-b974-0b879868c0f5@oracle.com> <[🔎] AVpI5XolCCA38sGzxlfk6azQI9oUAxafUVl9B7B1WgJEmGgSAQq5nvulQO6P_RQqjBp3adqasHFsodhAAxai0dcp5scRMJk0dLsGMQeSiew=@tylerwross.com> <[🔎] fVv3cF7Ulh3cKUP17C98gh_uOv9BcMlMpsIh1Nv5_0tdw-75PKiPJgIEP5o2jBVry7orwz7jeiGQenfCbuUxyj5JFstbx3RTFYr223qDmV0=@tylerwross.com> <[🔎] 176298368872.955.14091113173156448257.reportbug@nfsclient-sid.ipa.twrlab.net>
On 11/14/25 12:09 AM, Tyler W. Ross wrote:
> 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.
Then I would say further hunting for the broken commit is going to be
fruitless. Adding the WARNs in net/sunrpc/xdr.c is a good next step so
we see which XDR data item (assuming it's the same one every time) is
failing to decode.
--
Chuck Lever
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