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Date:   Mon, 6 Jul 2020 16:41:31 -0700
From:   Stephen Hemminger <stephen@networkplumber.org>
To:     "J. Bruce Fields" <bfields@fieldses.org>,
        Chuck Lever <chuck.lever@oracle.com>
Cc:     linux-nfs@vger.kernel.org
Subject: Fw: [Bug 208451] New: NFS server occasionally spontaneously reboots
 when client mounts exported directory
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Begin forwarded message:

Date: Mon, 06 Jul 2020 02:11:42 +0000
From: bugzilla-daemon@bugzilla.kernel.org
To: stephen@networkplumber.org
Subject: [Bug 208451] New: NFS server occasionally spontaneously reboots when client mounts exported directory


https://bugzilla.kernel.org/show_bug.cgi?id=208451

            Bug ID: 208451
           Summary: NFS server occasionally spontaneously reboots when
                    client mounts exported directory
           Product: Networking
           Version: 2.5
    Kernel Version: 5.7.7
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: stephen@networkplumber.org
          Reporter: nanook@eskimo.com
        Regression: No

This may be related to bug #208157.  From 5.7.0 through 5.7.4, nfs-server
would not start upon boot on one of my servers.

     With 5.7.7 this was resolved BUT now when I reboot one of the NFS clients
or unmount and remount an NFS partition on the client, the NFS server will
sometimes spontaneously reboot.

     I get these messages in /var/log/dmesg.0:

     (The old dmesg log I assume is relevant since it would be the active one
before the last boot).

[   40.302192] systemd[1]: Mounting NFSD configuration filesystem...
[   40.688313] kernel: RPC: Registered tcp NFSv4.1 backchannel transport
module.
[   69.899630] kernel: NFSD: Using UMH upcall client tracking operations.
[   69.899635] kernel: NFSD: starting 90-second grace period (net f00000a8)

     After the NFS server reboots I see these NFS related messages in dmesg:

[   53.810062] systemd[1]: Mounting NFSD configuration filesystem...
[   54.254326] RPC: Registered tcp NFSv4.1 backchannel transport module.
[  106.468779] NFSD: Using UMH upcall client tracking operations.
[  106.468781] NFSD: starting 90-second grace period (net f00000a8)
[  107.631713] NFS: Registering the id_resolver key type
[  110.815312] NFS4: Couldn't follow remote path
[  113.935404] NFS4: Couldn't follow remote path
[  117.055421] NFS4: Couldn't follow remote path
[  120.175488] NFS4: Couldn't follow remote path
[  123.295611] NFS4: Couldn't follow remote path
[  126.415625] NFS4: Couldn't follow remote path
[  129.545752] NFS4: Couldn't follow remote path
[  132.655844] NFS4: Couldn't follow remote path

     So pretty much the same thing except for the "NFS4: Couldn't follow remote
path" messages which I've read are caused by old nfs-utils not using the new
system calls so probably not relevant.

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