group.of.nepali.translators team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Trusty)
       Status: New => In Progress

** Changed in: linux (Ubuntu)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Xenial)
       Status: Triaged => In Progress

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

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Trusty)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Tags added: trusty

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https://bugs.launchpad.net/bugs/1683976

Title:
  Please backport fix to reference leak in cgroup blkio throttle

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Xenial:
  In Progress

Bug description:
  This is fixed in Linux 4.5
  https://github.com/torvalds/linux/commit/39a169b62b415390398291080dafe63aec751e0a

  Basically the module reference will leak whenever you write to
  /sys/fs/cgroup/blkio/blkio.throttle.*

  $ uname -a
  Linux david-kvm 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
  $ lsmod | grep ^zfs
  zfs                  2813952  1
  $ sudo sh -c 'i=100; while [ $i -gt 0 ]; do echo "230:0 1024" > /sys/fs/cgroup/blkio/blkio.throttle.read_bps_device; i=$(($i - 1)); done'
  $ lsmod | grep ^zfs
  zfs                  2813952  101

  This patch should be applied to all kernel < 4.5

  Thanks

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