Bug#855051: nfs-common: wrong shutdown sequence of wifi then nfs leaves nfs mounts hanging

[Joshua Pritikin <jpritikin@pobox.com>]

Package: nfs-common
Version: 1:1.3.4-2
Severity: normal

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?

I use autofs to mount NFS

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

I've noticed that when I shutdown, my wifi often goes down before the 
NFS volume is unmounted. This leads to a hang in the shutdown. I can 
provide journalctl logs if that would help.

   * What was the outcome of this action?

I usually get frustrated, search the web for work-arounds, and file bug 
reports. I've found some reports of this issue in various places. I 
wonder if there is already a debian bug to track this issue or, maybe, a 
fix is already known?

   * What outcome did you expect instead?

I expected a very rapid shutdown.

*** End of the template - remove these template lines ***


-- Package-specific info:
-- rpcinfo --
   program vers proto   port  service
    100000    4   tcp    111  portmapper
    100000    3   tcp    111  portmapper
    100000    2   tcp    111  portmapper
    100000    4   udp    111  portmapper
    100000    3   udp    111  portmapper
    100000    2   udp    111  portmapper
-- /etc/default/nfs-common --
NEED_STATD=
STATDOPTS=
NEED_IDMAPD=
NEED_GSSD=
-- /etc/idmapd.conf --
[General]
Verbosity = 0
Pipefs-Directory = /run/rpc_pipefs
[Mapping]
Nobody-User = nobody
Nobody-Group = nogroup
-- /etc/fstab --

-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages nfs-common depends on:
ii  adduser              3.115
ii  init-system-helpers  1.47
ii  keyutils             1.5.9-9
ii  libc6                2.24-9
ii  libcap2              1:2.25-1
ii  libcomerr2           1.43.4-2
ii  libdevmapper1.02.1   2:1.02.137-1
ii  libevent-2.0-5       2.0.21-stable-2.1
ii  libgssapi-krb5-2     1.15-1
ii  libk5crypto3         1.15-1
ii  libkeyutils1         1.5.9-9
ii  libkrb5-3            1.15-1
ii  libmount1            2.29.1-1
ii  libnfsidmap2         0.25-5.1
ii  libtirpc1            0.2.5-1.1
ii  libwrap0             7.6.q-26
ii  lsb-base             9.20161125
ii  rpcbind              0.2.3-0.5
ii  ucf                  3.0036

Versions of packages nfs-common recommends:
ii  python  2.7.13-2

Versions of packages nfs-common suggests:
pn  open-iscsi  <none>
pn  watchdog    <none>

-- no debconf information