[Bug 1687273] Missing required logs.

[Brad Figg]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1687273

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1687273

Title:
  Shared folder randomly not mounted

Status in cifs-utils package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello Everybody,

  since last update from ubuntu 16.04.2, last night, my servers are
  randomly not able to read and write from shared folders. I got this
  message:

  lsof: WARNING: can't stat() cifs file system /mnt/record
        Output information may be incomplete.
  lsof: WARNING: can't stat() cifs file system /mnt/record
        Output information may be incomplete.
  lsof: WARNING: can't stat() cifs file system /mnt/record
        Output information may be incomplete.
  ...
  rsync: ERROR: cannot stat destination "/mnt/record/": Host is down (112)
  rsync error: errors selecting input/output files, dirs (code 3) at main.c(652) [Receiver=3.1.1]

  This comes from my cron script.

  When I type df -h it takes sometimes very long to get the list. And it
  also can be that the mounted share is disconnected and I have to mount
  -a (what also takes long) again.

  My fstab have this command:

  //address /mnt/storage cifs
  auto,nofail,iocharset=utf8,rw,credentials=/path/.smb,uid=1000,gid=1000,file_mode=0660,dir_mode=0770
  0 0

  My update list from last night was this:

  linux-image-4.4.0-75-generic:amd64 (4.4.0-75.96, automatic)
  linux-image-extra-4.4.0-75-generic:amd64 (4.4.0-75.96, automatic)
  linux-headers-4.4.0-75-generic:amd64 (4.4.0-75.96, automatic)
  linux-headers-4.4.0-75:amd64 (4.4.0-75.96, automatic)
  Upgrade: libdns-export162:amd64 (1:9.10.3.dfsg.P4-8ubuntu1.5, 1:9.10.3.dfsg.P4-8ubuntu1.6)
  linux-headers-generic:amd64 (4.4.0.72.78, 4.4.0.75.81)
  linux-libc-dev:amd64 (4.4.0-72.93, 4.4.0-75.96)
  mysql-client-5.7:amd64 (5.7.17-0ubuntu0.16.04.2, 5.7.18-0ubuntu0.16.04.1)
  libapt-inst2.0:amd64 (1.2.19, 1.2.20)
  mysql-server-5.7:amd64 (5.7.17-0ubuntu0.16.04.2, 5.7.18-0ubuntu0.16.04.1)
  libsystemd0:amd64 (229-4ubuntu16, 229-4ubuntu17)
  linux-image-generic:amd64 (4.4.0.72.78, 4.4.0.75.81)
  apt:amd64 (1.2.19, 1.2.20)
  mysql-server:amd64 (5.7.17-0ubuntu0.16.04.2, 5.7.18-0ubuntu0.16.04.1)
  udev:amd64 (229-4ubuntu16, 229-4ubuntu17)
  libapt-pkg5.0:amd64 (1.2.19, 1.2.20)
  libudev1:amd64 (229-4ubuntu16, 229-4ubuntu17)
  cifs-utils:amd64 (2:6.4-1ubuntu1, 2:6.4-1ubuntu1.1)
  dpkg:amd64 (1.18.4ubuntu1.1, 1.18.4ubuntu1.2)
  mysql-client-core-5.7:amd64 (5.7.17-0ubuntu0.16.04.2, 5.7.18-0ubuntu0.16.04.1)
  libisc-export160:amd64 (1:9.10.3.dfsg.P4-8ubuntu1.5, 1:9.10.3.dfsg.P4-8ubuntu1.6)
  linux-virtual:amd64 (4.4.0.72.78, 4.4.0.75.81)
  systemd-sysv:amd64 (229-4ubuntu16, 229-4ubuntu17)
  distro-info-data:amd64 (0.28ubuntu0.2, 0.28ubuntu0.3)
  systemd:amd64 (229-4ubuntu16, 229-4ubuntu17)
  mysql-common:amd64 (5.7.17-0ubuntu0.16.04.2, 5.7.18-0ubuntu0.16.04.1)
  apt-utils:amd64 (1.2.19, 1.2.20)
  libmysqlclient20:amd64 (5.7.17-0ubuntu0.16.04.2, 5.7.18-0ubuntu0.16.04.1)
  linux-headers-virtual:amd64 (4.4.0.72.78, 4.4.0.75.81)
  linux-image-extra-virtual:amd64 (4.4.0.72.78, 4.4.0.75.81)
  thermald:amd64 (1.5-2ubuntu3, 1.5-2ubuntu4)
  qemu-guest-agent:amd64 (1:2.5+dfsg-5ubuntu10.10, 1:2.5+dfsg-5ubuntu10.11)
  libfreetype6:amd64 (2.6.1-0.1ubuntu2.1, 2.6.1-0.1ubuntu2.2)
  linux-image-virtual:amd64 (4.4.0.72.78, 4.4.0.75.81)
  libdpkg-perl:amd64 (1.18.4ubuntu1.1, 1.18.4ubuntu1.2)
  mysql-server-core-5.7:amd64 (5.7.17-0ubuntu0.16.04.2, 5.7.18-0ubuntu0.16.04.1)
  libxslt1.1:amd64 (1.1.28-2.1, 1.1.28-2.1ubuntu0.1)
  dpkg-dev:amd64 (1.18.4ubuntu1.1, 1.18.4ubuntu1.2)

  I saw that somebody else has the same problem:

  https://askubuntu.com/questions/910058/updates-broke-cifs-smb-mounts-
  in-16-04

  I had to remove the latest kernel update, after that it works.

  Regards

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