Re: Changes to the FireWire kernel drivers in Linux 3.1

[Stefan R. <st...@s5...>]

On Nov 26 Michal Suchanek wrote:
> On 26 November 2011 10:36, Stefan Richter <st...@s5...> wrote:
> > On Nov 22 Jack Chaney wrote:
> > [block layer bugs WRT device removal]
> >> I have been relying on Ubuntu 11.10 and I must reboot to minimize
> >> expose to this problem. Also, I redistribute a shareware application
> >> in a bootable iso file, and I need to remaster when this is fixed.
> >>
> >> Please send a heads-up when you know anything positive about this
> >> problem.  Thanks.
> >
> > This is not what you are waiting for to hear, but alas the current
> > 3.2.0-rc still contains issues of this kind:
> > http://marc.info/?l=linux-scsi&m=132214509516626
> 
> For me the latest 3.2 rc fixed an issue with kernel bug when removing
> an USB floppy so there are some improvements.
> 
> Or maybe I was just lucky and did not see the error because the block
> device happened to always go away at the right time.
> 
> 3.2 is worth some testing I guess, though.

3.2-rc7 panics if a program has a /dev/sr* open and issues an ioctl after
the device was unplugged.  Happens with 1394 CD-ROMs and USB CD-ROMs and
is 100% reproducible.  http://marc.info/?l=linux-scsi&m=132484684720593

When you plan to unplug a CD-ROM or card reader or any other drive which
announced itself as a removable media device (or when you don't plan to
unplug it but happen to trip over the cable), and you don't think you have
any program running anymore which still has a /dev/sr* open, then remember:
If udisks-daemon or hald is running, it may open the device at any moment
and thus trigger the same kernel panic right after device removal.
-- 
Stefan Richter
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http://arcgraph.de/sr/