Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
From:   "NeilBrown" <neilb@suse.de>
To:     "Mike Javorski" <mike.javorski@gmail.com>
Cc:     "Chuck Lever III" <chuck.lever@oracle.com>,
        "Linux NFS Mailing List" <linux-nfs@vger.kernel.org>
Subject: Re: NFS server regression in kernel 5.13 (tested w/ 5.13.9)
In-reply-to: <CAOv1SKB6xqyduf5L5hcXOe-xMN-UJOfFeE5eXVga3TviKuH0PA@mail.gmail.com>
References: <CAOv1SKCmdtchm5Z2NU80o49tkrHpAkPFaHKj4-vLDN5bZNCz-Q@mail.gmail.com>,
 <162846730406.22632.14734595494457390936@noble.neil.brown.name>,
 <CAOv1SKBZ7sGBnvG9-M+De+s=CfU=H_GBs4hJah1E4ks+NSMyPw@mail.gmail.com>,
 <CAOv1SKCUM5cGuXWAc7dsXtbmPMATqd245juC+S9gVXHWiZsvmQ@mail.gmail.com>,
 <162855893202.12431.3423894387218130632@noble.neil.brown.name>,
 <CAOv1SKAaSbfw53LWCCrvGCHESgdtCf5h275Zkzi9_uHkqnCrdg@mail.gmail.com>,
 <162882238416.1695.4958036322575947783@noble.neil.brown.name>,
 <CAOv1SKB_dsam7P9pzzh_SKCtA8uE9cyFdJ=qquEfhLT42-szPA@mail.gmail.com>,
 <CAOv1SKDDOj5UeUwztrMSNJnLgSoEgD8OU55hqtLHffHvaCQzzA@mail.gmail.com>,
 <162907681945.1695.10796003189432247877@noble.neil.brown.name>,
 <87777C39-BDDA-4E1E-83FA-5B46918A66D3@oracle.com>,
 <CAOv1SKA5ByO7PYQwvd6iBcPieWxEp=BfUZuigJ=7Hm4HAmTuMA@mail.gmail.com>,
 <162915491276.9892.7049267765583701172@noble.neil.brown.name>,
 <162941948235.9892.6790956894845282568@noble.neil.brown.name>,
 <CAOv1SKAyr0Cixc8eQf8-Fdnf=9Db_xZGsweq9K2E5AkALFqavQ@mail.gmail.com>,
 <CAOv1SKDDUFpgexZ_xYCe6c2-UCBK0+vicoG+LAtG2Zhispd_jg@mail.gmail.com>,
 <162960371884.9892.13803244995043191094@noble.neil.brown.name>,
 <CAOv1SKBePD6N-R0uETgcSPA-LZZ4895ZJDKTY7mYvhfu184OQQ@mail.gmail.com>,
 <162966962721.9892.5962616727949224286@noble.neil.brown.name>,
 <CAOv1SKB6xqyduf5L5hcXOe-xMN-UJOfFeE5eXVga3TviKuH0PA@mail.gmail.com>
Date:   Fri, 27 Aug 2021 07:44:37 +1000
Message-id: <163001427749.7591.7281634750945934559@noble.neil.brown.name>
Precedence: bulk

On Fri, 27 Aug 2021, Mike Javorski wrote:
> I finally had the chance to test with the offloading disabled on the
> server. Unfortunately, the issues remain, may even be more frequent,
> but I can't rule out confirmation bias on that one.
> 
> Not sure where to go from here.

Have you tried NFSv3?  Or 4.0?
I am (or was) leaning away from thinking it was an nfsd problem, but we
cannot rule anything out until we know that is happening.

I plan to have another dig through the code changes today.

NeilBrown