[Bug 829407] Re: Ubuntu hangs on shutdown after mounting usb pendrive with btrfs

[Daniel Kulesz]

I think this is exactly the problem.

One easy way to reproduce it is as follows:
1.) Insert an USB pendrive with btrfs on it.
2.) Verify that the USB pendrive got automounted (but do not open it in nautilus)
3.) dd the pendrive (depending on your device number, i.e.: dd if=/dev/zero of=/dev/sdc)
4.) remove the pendrive
5.) Try to shutdown Ubuntu

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https://bugs.launchpad.net/bugs/829407

Title:
  Ubuntu hangs on shutdown after mounting usb pendrive with btrfs

Status in “btrfs-tools” package in Ubuntu:
  New

Bug description:
  After mounting a pendrive with btrfs on it, Ubuntu hangs on shutdown
  even if the drive has been previously removed. The behavior can be
  observed in Ubuntu 10.10 as well as in 10.04.

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