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From:   Michael Wakabayashi <mwakabayashi@vmware.com>
To:     Olga Kornievskaia <aglo@umich.edu>
CC:     Trond Myklebust <trondmy@hammerspace.com>,
        "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
        "SteveD@redhat.com" <SteveD@redhat.com>
Subject: Re: NFSv4: Mounting NFS server which is down, blocks all other NFS
 mounts on same machine
Thread-Topic: NFSv4: Mounting NFS server which is down, blocks all other NFS
 mounts on same machine
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Date:   Wed, 9 Jun 2021 05:31:08 +0000
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List-ID: <linux-nfs.vger.kernel.org>
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Hi Olga,=0A=
=0A=
There seems to be a discrepancy between what you're seeing and what we're s=
eeing.=0A=
=0A=
So we were wondering if you can you please run these commands in your Linux=
 environment and paste the output of the mount command below?=0A=
    $ sudo mkdir -p /tmp/mnt.dead=0A=
    $ time sudo mount -o vers=3D4 -vvv 2.2.2.2:/fake_path /tmp/mnt.dead=0A=
=0A=
We'd like the mount command to specifically use "2.2.2.2:/fake_path" since =
we know it is unreachable and outside your subnet.=0A=
We're hoping by mounting "2.2.2.2:/fake_path" you'll be able to reproduce t=
he same behavior that we're seeing.=0A=
=0A=
Also, if possible, a packet trace would be helpful:=0A=
    $ sudo tcpdump -s 0 -w /tmp/nfsv4.pcap port 2049=0A=
=0A=
On my Ubuntu VirtualMachine, I see this output:=0A=
    ubuntu@mikes-ubuntu-21-04:~$ time sudo mount -o vers=3D4 -vvv 2.2.2.2:/=
fake_path /tmp/mnt.dead=0A=
    mount.nfs: timeout set for Wed Jun  9 05:12:15 2021=0A=
    mount.nfs: trying text-based options 'vers=3D4,addr=3D2.2.2.2,clientadd=
r=3D10.162.132.231'=0A=
    mount.nfs: mount(2): Connection timed out=0A=
    mount.nfs: Connection timed out=0A=
    real  3m1.257s=0A=
    user  0m0.006s=0A=
    sys 0m0.007s=0A=
=0A=
Thanks, Mike=