Userspace proglem [Fwd: Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files]

Userspace proglem [Fwd: Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files]

[Stephen Samuel]

From: Xavier Bestel <xavier.bestel@free.fr>
> 
> Le jeu 02/05/2002 à 10:26, Stephen Samuel a écrit :
>> I ran a similar type of test on a 2.4.9.31 (redhat 7.1 ) kernel.
>> With the CD on HDD, I could read off of HDA just peachy while
>> the system was choking on a scratched (aol) cd.
> 
> The "system grinding to a halt" happens to me too, when *ripping*
> scratched cds. Note that it's when using *userspace* access to the block
> device, with e.g. cdparanoia or grip (or dvd ripping tools).
> 
> My DVD drive is on a VT82C693A/694x (ABit VP6).

A very important distinction. I'm not willing to sacrifice any of my
music CDs to the experiment, but if userspace reads are what block the
whole system, that explains why everybody claims that everybody else
is crazy.  All of my tests have been pure kernel-space (fs) accesses,
This is probably why I haven't seen any blockages.

Moral of the story: don't rip scratched CDs on server boxes
(at least -- nut until this is fixed, anyways).

-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
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