[Bug 1317833] [NEW] DRBD 8.4 kernel crash when using same resource for 2 minors

[Dick Tump]

Public bug reported:

When you use the same resource for 2 minors, it crashes the kernel. Of
course you should not do that, though I think it should not crash the
kernel. The expected output is just an error message. This makes DRBD
resource/minor management more difficult and also kind of dangerous.

DRBD 8.3 does not have this problem, probably because it works a bit
different with resources/minors.

Steps to reproduce:
* drbdsetup new-resource test1
* drbdsetup new-minor test1 1 0
* drbdsetup new-minor test1 3 0

It exits showing the message 'Killed'. The kernel log shows some errors
and DRBD is not usable anymore. After a short while or when executing
other drbdsetup commands, the whole system crashes.

I am not sure whether it's the utils package, or the kernel module.

System info:
Description:	Ubuntu 14.04 LTS
Release:	14.04
drbd8-utils version: 2:8.4.4-1ubuntu1
Installed kernel: linux-image-3.13.0-24-generic 3.13.0-24.47

** Affects: drbd8 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1317833

Title:
  DRBD 8.4 kernel crash when using same resource for 2 minors

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