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[Bug 1564807] Re: nfs causes guest system to get stuck


Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.6 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:

Once testing of the upstream kernel is complete, please mark this bug as

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc1-wily/

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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  nfs causes guest system to get stuck

Status in linux package in Ubuntu:

Bug description:
  Host OS Ubuntu 15.10
  Guest OS Ubuntu 14.10

  Using Vagrant with nfs and Virtualbox and static ip on the private

  It is working perfectly except that after having suspended the host
  OS, the entire guest OS will be unusable. This does not happen when
  using the normal virtualbox shared folders.

  It's not only the nfs shared folder that is unusable, the entire OS is
  hanging. Even syslog does not seem to see much action. This is syslog
  on the guest, from waking up until vagrant halt is completed.

  Feb 26 07:15:33 vagrant kernel: [ 8375.252989] e1000: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
  Feb 26 07:16:11 vagrant kernel: [ 8413.109832] nfs: server not responding, still trying
  Feb 26 07:16:38 vagrant kernel: [ 8440.687476] nfs: server not responding, still trying
  Feb 26 07:17:01 vagrant CRON[3776]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
  Feb 26 07:20:33 vagrant rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="753" x-info="http://www.rsyslog.com";] exiting on signal 15.

  When I try to ssh to the guest system I the motd and last login: ..., but nothing more, it just hangs.
  If I was already logged in the guest system through ssh then that session is unresponsive (after pressing enter).

  How can this be fixed?
  How should I debug it?

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