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Date:      Tue, 29 May 2018 21:19:16 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 228497] [nfs] kernel panic in nfsrv_checksequence
Message-ID:  <bug-228497-3630-e85K9hOu9s@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-228497-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-228497-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D228497

Rick Macklem <rmacklem@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|fs@FreeBSD.org              |rmacklem@FreeBSD.org
             Status|New                         |In Progress
                 CC|                            |rmacklem@FreeBSD.org

--- Comment #1 from Rick Macklem <rmacklem@FreeBSD.org> ---
Created attachment 193829
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D193829&action=
=3Dedit
Free up sessions when an ExchangeID with new co_verifier is done

This patch might fix the crashes. However, I don't know how the
Linux client might have gotten into this situation?
(Normally a Linux client only changes the co_verifier when it is
 hard rebooted via the power cord or similar.)

This patch was committed to FreeBSD-current as r333580, but has not been
MFC'd.

If you could apply this patch to your server(s) and report of you get
another crash with the patch applied, that would tell us that something
else is broken.

Basically a crash like this occurs when the server somehow is using
a session when it is free'd.

Maybe some sort of network partitioning/client reboot or similar triggered
the behaviour that caused the crashes?

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