[Bug 1687273] Re: Shared folder randomly not mounted

[Iggy]

Updating the kernel to the latest version did not fix the problem for
me, unfortunately. This is still quite unacceptable, not being able to
access essential files and folders!

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Title:
  Shared folder randomly not mounted

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

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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