linux-kernel - Re: [Cbe-oss-dev] [regression/bisected] corrupt CD data after media change and delay

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Message-ID: <5a4c581d0807231325v5150ed6qbea2798608a98bd7@mail.gmail.com>
Date:	Wed, 23 Jul 2008 22:25:18 +0200
From:	"Alessandro Suardi" <alessandro.suardi@...il.com>
To:	"James Bottomley" <James.Bottomley@...senpartnership.com>
Cc:	"Geert Uytterhoeven" <Geert.Uytterhoeven@...ycom.com>,
	linux-scsi@...r.kernel.org,
	"Linux Kernel Development" <linux-kernel@...r.kernel.org>,
	"Maarten Bressers" <mbres@...too.org>,
	"Daniel Drake" <dsd@...too.org>,
	"Cell Broadband Engine OSS Development" <cbe-oss-dev@...abs.org>
Subject: Re: [Cbe-oss-dev] [regression/bisected] corrupt CD data after media change and delay

On Sun, Jul 13, 2008 at 3:33 PM, James Bottomley
<James.Bottomley@...senpartnership.com> wrote:
> On Sat, 2008-07-12 at 14:08 +0200, Alessandro Suardi wrote:
>> On Fri, Jul 11, 2008 at 11:25 PM, Alessandro Suardi
>> sr0: rw=0, want=3291928, limit=2097151
>> [asuardi@...dman sdlmame0126]$ h | grep siz
>>   958  cat /sys/block/sr0/size
>>  1031  h | grep siz
>> [asuardi@...dman sdlmame0126]$ !958
>> cat /sys/block/sr0/size
>> 6993536
>>
>> <eject, remount DVD>
>>
>> [asuardi@...dman sdlmame0126]$ !mount
>> mount -r /cdrom
>> [asuardi@...dman sdlmame0126]$ cat /sys/block/sr0/size
>> 6993536
>>
>> <now everything works fine>
>>
>> Possibly a new bug then - since size is always the same ?
>
> It looks like a re-manifestation of Geert's bug.
>
> You said everything worked in -rc7, and there actually have been no sr
> changes at all between then and now, so I'm a bit confused as to how it
> could reappear.  Could you try a bisection search for it (first
> re-verify -rc7 is OK, just in case that's a false negative).

I have been away a few days - I'll try this weekend rebuilding
 older kernels (I save religiously my .configs for every kernel
 I built in the last, um, five years at least) and give the reboot/
 DVD mount/access sequence a go...

The good news is that in 2.6.26-git4, -git9, -git10 I have been
 unable to reproduce the issue a single time. Still, I'm willing
 to make a bit more effort in trying to reproduce.

--alessandro

 "Give me love / Or give me hate
 Give me anything that's not just ok"

 (Sophia, 'Weightless')
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