Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: btrfs-tools (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/829407
Title:
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)
Do you recall if the device specifically unmounted before removing it?
Btrfs doesn't handle devices going missing very well yet.
The output of alt-sysrq-w during a hang would be useful.
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