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boundary="------------61mNurIjhnkHl9ukE0pN00oh"; protected-headers="v1" From: Calum Mackay To: Chuck Lever III , Harald Dunkel Cc: Calum Mackay , Linux NFS Mailing List Message-ID: <4eeb2367-c869-4960-869b-c23ef824e044@oracle.com> Subject: Re: nfsd becomes a zombie References: <4c3080af-eec7-4af5-8b0d-c35ac98ec074@aixigo.com> In-Reply-To: --------------61mNurIjhnkHl9ukE0pN00oh Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 17/06/2024 3:31 pm, Chuck Lever III wrote: > > >> On Jun 17, 2024, at 2:55 AM, Harald Dunkel wrote: >> >> Hi folks, >> >> what would be the reason for nfsd getting stuck somehow and becoming >> an unkillable process? See >> >> - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1071562 >> - https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/2062568 >> >> Doesn't this mean that something inside the kernel gets stuck as >> well? Seems odd to me. > > I'm not familiar with the Debian or Ubuntu kernel packages. Can > the kernel release numbers be translated to LTS kernel releases The Debian NFS server's broken kernel corresponds to upstream stable 6.1.90. There doesn't seem to be any note of a working version. Decoding the Ubuntu pkg version is harder (but is obviously the 6.8.y series; the actual corresponding 'y' value is printed during boot, but other than downloading the pkg source, I'm not sure how to find it otherwise). The older Ubuntu mentioned in the bug as seeing the nfsd issue will be 6.5.y. Harald: do you have a Debian/Ubuntu kernel version that doesn't see the issue, please? i.e. ideally from the same 6.1.y series… cheers, c. > please? Need both "last known working" and "first broken" releases. > > This: > > [ 6596.911785] RPC: Could not send backchannel reply error: -110 > [ 6596.972490] RPC: Could not send backchannel reply error: -110 > [ 6837.281307] RPC: Could not send backchannel reply error: -110 > > is a known set of client backchannel bugs. Knowing the LTS kernel > releases (see above) will help us figure out what needs to be > backported to the LTS kernels kernels in question. > > This: > > [11183.290619] wait_for_completion+0x88/0x150 > [11183.290623] __flush_workqueue+0x140/0x3e0 > [11183.290629] nfsd4_probe_callback_sync+0x1a/0x30 [nfsd] > [11183.290689] nfsd4_destroy_session+0x186/0x260 [nfsd] > > is probably related to the backchannel errors on the client, but > client bugs shouldn't cause the server to hang like this. We > might be able to say more if you can provide the kernel release > translations (see above). > > > -- > Chuck Lever > > -- Calum Mackay Linux Kernel Engineering Oracle Linux and Virtualisation --------------61mNurIjhnkHl9ukE0pN00oh-- --------------dqDQXgOujKI8wX0mXwS3MR0p Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wsF5BAABCAAjFiEE1GBbrQYgx8o9Vdw+hSPvAG3BU+IFAmZwjJcFAwAAAAAACgkQhSPvAG3BU+IA vxAAuRPyFVX+cSIjkiGhPJmBZHQ3XkTnsINBypJ8/lxlOvH85fCAy26DsB3BXNuek/OIGc8xFnfk +OtFUdc7AcWMng8n2z1FWpFnAhsb+jDHyYz/HkPba1OTxvewDoBdRE92RtZZiD2iYJdyY6NaNDkk 0g8gohvpEb3HD9TsqP8X450eAFNdeyJpqjFEByYnl23/3dIoi5NpRzNx3eSkqAgFajKKCe49P8cm BG9dH2V+fFyrVBYW/LPcLeDgQVBs9pUz6ZHjW7NdrbfDrTieRBO5eprfmu0bV+jT6xLKDHjMcUj6 V4g4zYQJmYz4ZG1c8eyeHdRkPIZIf0ybc5o1rhw5qwW7SQHkVKc+/qCdjY6p5QR4/FzP0ZhPqdDY av67MnAhRjqz+69fleuGnMH6GhjTA8oQ76vaSIbl5yGDhBsH9JNsEAJxB30hz7QqHgGvWheO4f/4 0M22xGY1Y8qU2+DXTmIv49vh6fc0JO3ZFaWDnN+CxihAv2wY7tKUrEWSGEaopRRXLMy5dvMpXjii SZFAaL2yjh39SQMvAHbO9NHBk304Ku5bPO3FWbuX0W3ao1w2BXJOC/2ca2y6kQlG4vAlPldQcTv2 4GMBbwUxfKdzOwBfd6Kbl+nIOL7kqBbCk0/DRhotfAjyJsxfZ0yqnEWnp5x8db+u/rulheuas6eZ OBI= =LeSM -----END PGP SIGNATURE----- --------------dqDQXgOujKI8wX0mXwS3MR0p--