[Bug 101011] Kernel Oops when disconnecting a mounted ext4 usb stick

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https://bugzilla.kernel.org/show_bug.cgi?id=101011

--- Comment #10 from Theodore Tso <tytso@mit.edu> ---
On Sat, Aug 15, 2015 at 10:19:02AM +0200, Christoph Hellwig wrote:
> 
> sorry for the delay - I saw the mail Jan Cc'ed me on yesterday.  After
> my changes it should not go away and I had tested the original eject
> test that it indeed didn't.  Either I forgot a case, or the major
> writeback Tejun did a little later regressed it.
> 
> As I won't have time to look into it ASAP I'd suggest to revert my
> patch for now.  In the long run I really don't want to have these
> checks spread over file system so I plan to look into it once I
> get a few spare hours.

Thanks, I'll revert the patch.

I suspect we should add an ioctl to simulate a USB device unplug using
the loopback block device, so we can add a test to xfstests.

                                            - Ted

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