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Date:   Mon, 27 Apr 2020 18:20:21 -0400
To:     sea you <seayou@gmail.com>
Cc:     linux-nfs@vger.kernel.org
Subject: Re: TestStateID woes with recent clients
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From:   bfields@fieldses.org (J. Bruce Fields)
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On Mon, Apr 20, 2020 at 04:32:27PM +0200, sea you wrote:
> Time-to-time we're plagued with a lot of "TestStateID" RPC calls on a
> 4.15.0-88 (Ubuntu Bionic) kernel, where clients (~310 VMS) are using
> either 4.19.106 or 4.19.107 (Flatcar Linux). What we see during these
> "storms", is that _some_ clients are testing the same id for callback
> like
...
> Due to this, some processes on some clients are stuck and these nodes
> need to be rebooted. Initially, we thought we're facing the issue that
> was fixed in 44f411c353bf, but as I see we're already using a kernel
> where it was backported to via 90d73c1cadb8.
> 
> Clients are mounting as
> "rw,nosuid,nodev,noexec,noatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,acregmin=600,acregmax=600,acdirmin=600,acdirmax=600,hard,proto=tcp,timeo=600,retrans=2,sec=sys"
> 
> Export options are the following
> "<world>(rw,async,wdelay,crossmnt,no_root_squash,no_subtree_check,fsid=762,sec=sys,rw,secure,no_root_squash,no_all_squash)"

Sorry for the derail, but the "async" export option is almost a never
good idea.

> Can you please point me in a direction that I should check further?

Off the top of my head, my only suggestion is to retest if possible on
the latest upstream kernel.

--b.