Bug#675621: system freeze after safely unmounting usb drive

[Ben Hutchings <ben@decadent.org.uk>]

On Tue, Jun 05, 2012 at 09:05:42AM +0200, Rik Theys wrote:
> reassign 675621 linux-2.6
> thanks
> 
> Hi,
> 
> I have seen similar crashes with the 6.0.x kernel on some of our
> systems. Unfortunately the systems are in a remote location and I
> was unable to capture any crash screens.
[...]

This sounds somewhat the bug fixed by:

commit 8354a9e00afb022f6b508bd7d6bd74daebb8b751
Author: James Bottomley <James.Bottomley@HansenPartnership.com>
Date:   Wed May 25 15:52:14 2011 -0500

    Fix oops caused by queue refcounting failure
    
    commit e73e079bf128d68284efedeba1fbbc18d78610f9 upstream.

or possibly:

commit 5e4c1dbf52bc1ff33782266332a62151d5b5f0be
Author: James Bottomley <James.Bottomley@suse.de>
Date:   Wed May 18 16:20:10 2011 +0200

    block: add proper state guards to __elv_next_request
    
    commit 0a58e077eb600d1efd7e54ad9926a75a39d7f8ae upstream.

But we've had those since linux-2.6 version 2.6.32-36 (Debian release
6.0.3).  So unless Sebastien has somehow failed to upgrade then this
must be something different.

We're really going to need a kernel log in order to make any progress
on this.

Ben.

-- 
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
                                                              - Albert Camus