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NFS troubles on Suspend

I'm having an issue where NFS hangs after my laptop resumes after suspended from closing the lid.

The scenario is a fresh Debian Jessie install, which is host to a Debian 7.4 VM using VirtualBox, which is managed by Vagrant. 

I'm hoping to get some advice on debugging this. I realize the Vagrant/VirtualBox complicates things, but I have had a similar setup working without problems in with a Ubuntu 14.04 host, and so far it feels like this is a related to the Debian host.

Steps to reproduce:

With a Vagrantfile like this:

Vagrant.configure(2) do |config|
  config.vm.box = "chef/debian-7.4"
  config.vm.network "private_network", ip: ""
  config.vm.synced_folder "test", "/mnt/test", nfs: true

ssh into guest:

$ vagrant ssh

Change directory shared directory:

vagrant@packer-debian-7:~$ cd /mnt/test/

Suspend and resume by closing laptop lid.

Attempt a directory listing in shared directory from the guest.

vagrant@packer-debian-7:/mnt/test$ ls -al

... and the command will hang.

When I look at the process list, I see that that 'ls' process is stuck in D/uninterruptible sleep.


“There’s nothing sadder to me than associations held together by nothing but the glue of postage stamps" - East of Eden

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