Date: Wed, 2 Jun 2021 16:07:22 -0600 From: Alan Somers <asomers@freebsd.org> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: "nfs server not responding, timed out" with Linux client and 13.0-RELEASE server Message-ID: <CAOtMX2gnSrF-73RVgV7-p_FECLndSc40e_M7LFJqihVLBtD5Lg@mail.gmail.com> In-Reply-To: <YQXPR0101MB0968D693F45A87E0ACA991A7DD3D9@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> References: <CAOtMX2iDcJYuAkFURigZNNZNHDWShK01%2BmmTpGWGHkd%2BSrwwqA@mail.gmail.com> <YQXPR0101MB0968D693F45A87E0ACA991A7DD3D9@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM>
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--0000000000008a3e2005c3cfaf47 Content-Type: text/plain; charset="UTF-8" On Tue, Jun 1, 2021 at 7:09 PM Rick Macklem <rmacklem@uoguelph.ca> wrote: > Alan Somers wrote: > >I have several Linux NFS clients (Debian, with various 4.9 kernels) > >mounting NFS 4.0 from both Solaris and FreeBSD (mostly 12.2-RELEASE) > >servers. I frequently see kernel messages in the clients about "nfs: > >server <HOSTNAME> not responding, timed out" for both the FreeBSD and > >Solaris servers. It usually recovers after a few seconds. However, on > the > >sole 13.0-RELEASE server, the hangs last for minutes to hours. > > > >tcpdump/wireshark shows the NFS client sending a "V4 Call SEQUENCE" packet > >every 5-10 seconds, all with the same sessionid. The server responds with > >a TCP ACK, but sends no NFS-level response. I've seen this with both NFS > >4.0 and 4.2. > > > >NFS delegations are disabled, and nfsdumpstate shows that the client has > >callbacks enabled, with 2-4 opens, openowners, locks, and lockowners. > > > >Can anybody suggest how to fix or further debug this problem? > See PR#256280 for the ways to fix this, rick > > -Alan > Thanks for the tip, Rick! I reverted the change mentioned in that PR, and everything seems fine so far. -Alan --0000000000008a3e2005c3cfaf47--
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