Public bug reported:

This issue impacts Ubuntu 12.04.

Whenever a device is unregistered in vmbus_device_unregister
(drivers/hv/vmbus_drv.c), the device name in the log message may contain
garbage as the memory has already been freed by the time pr_info is
called.  Log example:

  [ 3149.170475] hv_vmbus: child device àõsèè0_5 unregistered

By logging the message just before calling device_unregister, the
correct device name is printed:

  [ 3145.034652] hv_vmbus: child device vmbus_0_5 unregistered


This issue has been resolved with the upstream patch: 
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/hv/vmbus_drv.c?id=84672369ffb98a51d4ddf74c20a23636da3ad615

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

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https://bugs.launchpad.net/bugs/1417313

Title:
  [Hyper-V] vmbus: incorrect device name is printed when child device is
  unregistered

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