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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

apport-collect 1501623

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/1501623

Title:
  UFS rw support fails with 3.19.0-26-generic

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hi guys,

  I'd like to enable rw support for ufs file system with kernel
  3.19.0-26-generic.

  Basically, I follow steps as below from
  http://oz123.github.io/writings/2012-11-26-enable-ufs-write-support-
  debian/

  sudo apt-get build-dep --no-install-recommends linux-image-$(uname -r)

  mkdir ufs_rw
  cd ufs_rw

  apt-get source linux-image-$(uname -r)
  cp -v /usr/src/linux-headers-$(uname -r)/Module.symvers .

  cd linux-*/
  cp -v /boot/config-$(uname -r) .

  make  EXTRAVERSION=-4 O=~/ufs_rw  oldconfig

  sed -i 's/# CONFIG_UFS_FS_WRITE is not set/CONFIG_UFS_FS_WRITE=y/'
  ~/ufs_rw/.config

  make  EXTRAVERSION=-4 O=~/ufs_rw prepare

  make  EXTRAVERSION=-4 O=~/ufs_rw outputmakefile

  make  EXTRAVERSION=-4 O=~/ufs_rw archprepare

  make  EXTRAVERSION=-4 O=~/ufs_rw modules SUBDIRS=scripts

  make  EXTRAVERSION=-4 O=~/ufs_rw modules SUBDIRS=fs/ufs

  I get ufs.ko under ufs_rw/fs/ufs and try it with below commands.

  modprobe nbd

  qemu-nbd -c /dev/nbd0 freebsd10u1x64

  mount -t ufs -o ufstype=ufs2,rw /dev/nbd0p2 /mnt

  There is no error or warning when I run

  mount -t ufs -o ufstype=ufs2,rw /dev/nbd0p2 /mnt

  However, when I try to write something to /mnt or even umount /mnt,
  there is kernel panic.

  And further more, the way above works for
  3.8.0-34-generic/3.11.0-26-generic.

  That means I can read/write correctly with ufs2 file system.

  It breaks with 3.19.0-26-generic, from my view.

  Please let me know if more info is needed.

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