Re: [regression/bisected] corrupt CD data after media change anddelay

[Geert Uytterhoeven]

On Fri, 6 Jun 2008, James Bottomley wrote:
> On Fri, 2008-06-06 at 16:06 +0200, Geert Uytterhoeven wrote:
> > When mounting a CD/DVD more than 30 seconds after inserting it, and reading
> > from it, we get:
> > 
> >     attempt to access beyond end of device
> >     sr0: rw=0, want=371932, limit=371928
> >     Buffer I/O error on device sr0, logical block 92982
> >     attempt to access beyond end of device
> >     sr0: rw=0, want=371936, limit=371928
> >     Buffer I/O error on device sr0, logical block 92983
> >     attempt to access beyond end of device
> >     sr0: rw=0, want=371940, limit=371928
> >     Buffer I/O error on device sr0, logical block 92984
> >     attempt to access beyond end of device
> >     sr0: rw=0, want=371944, limit=371928
> >     Buffer I/O error on device sr0, logical block 92985
> >     attempt to access beyond end of device
> >     sr0: rw=0, want=371948, limit=371928
> >     Buffer I/O error on device sr0, logical block 92986
> >     ...
> > 
> > It can be reproduced on a PS3 with busybox userland using:
> > 
> >     # Insert first CD
> >     $ mount /dev/sr0 /mnt
> >     $ ls -R /mnt
> >     $ umount /mnt
> >     $ eject
> >     # Remove first CD
> > 
> >     # Insert second CD
> >     # Wait at least 30 seconds
> >     $ mount /dev/sr0 /mnt
> >     $ tar cf /dev/null /mnt
> > 
> > It does not happen when mounting the second CD within 30 seconds after
> > inserting it, which is consistent with
> > 
> >     #define SR_TIMEOUT     (30 * HZ)
> > 
> > I can't seem to reproduce it with a Debian or Fedora Core 6 userland.
> > 
> > The problem is present in 2.6.25.
> > 2.6.24 is OK.
> 
> Hmm ... how are you preventing HAL from automatically mounting the CD?

By not running HAL?

> Also, in the two different situations, what does
> 
> cat /sys/block/sr0/size
> 
> (assuming your cd is sr0) give you?  My first theory is an incorrect
> size propagating from something.

I'll give that a try on Monday...

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre
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