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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1743026
and then change the status of the bug to 'Confirmed'.
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Xenial)
Status: New => Incomplete
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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:
Incomplete
Status in linux source package in Xenial:
Incomplete
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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