Date: Mon, 29 Mar 2021 21:52:31 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: FreeBSD NFSv4.1/4.2 server is broken when Linux mounts use "nconnects" Message-ID: <YQXPR0101MB0968CD19A33C3F03FFD7F4F4DD7E9@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM>
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Hi,
The FreeBSD NFS server is broken when handling multiple
connections for NFSv4.1/4.2.
It incorrectly binds the back channel to a new connection
when is sees an RPC with Sequence in it (almost all RPCs)
and might send a callback on the wrong connection.
I have a fix, but it won't be in a release until 12.3/13.1.
It can be found in Bugzilla PR#254560.
In the meantime, avoid using the "nconnects" option
on Linux client mounts.
Thanks go to Ben Coddington @redhat for diagnosing
this and testing the patch.
Sorry about the breakage, rick
ps: It was done intentionally long ago, when clients
did not do BindConnectionToSession and then slipped
through the cracks.
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