group.of.nepali.translators team mailing list archive

[Chris J Arges <1743026@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

[impact]
4.4.0-101+ (also 4.4.0-109) Ubuntu kernels no longer can use qemu-nbd to mount virtual disks onto a local filesystem (see test case for reproducer). 4.4.0-98 works without issue.

I was able to bisect the issue down to
907196aba0d891c6d580abe69c36d3b4fd512dcc (a cherry-pick from
37091fdd831f28a6509008542174ed324dd645bc). Reverting this from 4.4 fixes
the issue.

Installing the mainline kernel shows mainline is _not_ affected by this
bug.

In addition this is also reported in debian here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829532

[test case]
# given a vmdk disk with multiple partitions
sudo modprobe nbd
sudo qemu-nbd -d /dev/nbd0
sudo qemu-nbd -r -c /dev/nbd0 disk.vmdk
ls /dev/nbd0*
# here you won't see multiple partition, nor be able to mount a partition locally

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Xenial)
     Importance: Undecided
         Status: New

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

** Description changed:

  [impact]
  4.4.0-101+ (also 4.4.0-109) Ubuntu kernels no longer can use qemu-nbd to mount virtual disks onto a local filesystem (see test case for reproducer).
  
  I was able to bisect the issue down to
- 907196aba0d891c6d580abe69c36d3b4fd512dcc. Reverting this from 4.4 fixes
+ 907196aba0d891c6d580abe69c36d3b4fd512dcc (a cherry-pick from
+ 37091fdd831f28a6509008542174ed324dd645bc). Reverting this from 4.4 fixes
  the issue.
  
  In addition this is also reported in debian here:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829532
  
  [test case]
  # given a vmdk disk with multiple partitions
  sudo modprobe nbd
  sudo qemu-nbd -d /dev/nbd0
  sudo qemu-nbd -r -c /dev/nbd0 disk.vmdk
  ls /dev/nbd0*
  # here you won't see multiple partition, nor be able to mount a partition locally

** Description changed:

  [impact]
- 4.4.0-101+ (also 4.4.0-109) Ubuntu kernels no longer can use qemu-nbd to mount virtual disks onto a local filesystem (see test case for reproducer).
+ 4.4.0-101+ (also 4.4.0-109) Ubuntu kernels no longer can use qemu-nbd to mount virtual disks onto a local filesystem (see test case for reproducer). 4.4.0-98 works without issue.
  
  I was able to bisect the issue down to
  907196aba0d891c6d580abe69c36d3b4fd512dcc (a cherry-pick from
  37091fdd831f28a6509008542174ed324dd645bc). Reverting this from 4.4 fixes
  the issue.
+ 
+ Installing the mainline kernel shows mainline is _not_ affected by this
+ bug.
  
  In addition this is also reported in debian here:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829532
  
  [test case]
  # given a vmdk disk with multiple partitions
  sudo modprobe nbd
  sudo qemu-nbd -d /dev/nbd0
  sudo qemu-nbd -r -c /dev/nbd0 disk.vmdk
  ls /dev/nbd0*
  # here you won't see multiple partition, nor be able to mount a partition locally

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https://bugs.launchpad.net/bugs/1743026

Title:
  qemu-nbd -c /dev/nbd0 fails to map partitions

Status in linux package in Ubuntu:
  New
Status in linux source package in Xenial:
  New

Bug description:
  [impact]
  4.4.0-101+ (also 4.4.0-109) Ubuntu kernels no longer can use qemu-nbd to mount virtual disks onto a local filesystem (see test case for reproducer). 4.4.0-98 works without issue.

  I was able to bisect the issue down to
  907196aba0d891c6d580abe69c36d3b4fd512dcc (a cherry-pick from
  37091fdd831f28a6509008542174ed324dd645bc). Reverting this from 4.4
  fixes the issue.

  Installing the mainline kernel shows mainline is _not_ affected by
  this bug.

  In addition this is also reported in debian here:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829532

  [test case]
  # given a vmdk disk with multiple partitions
  sudo modprobe nbd
  sudo qemu-nbd -d /dev/nbd0
  sudo qemu-nbd -r -c /dev/nbd0 disk.vmdk
  ls /dev/nbd0*
  # here you won't see multiple partition, nor be able to mount a partition locally

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