css hang; somewhere between test12 and test13pre4ac2

css hang; somewhere between test12 and test13pre4ac2

[Dave Gilbert]

Hi,
  Somewhere between test12 and test13pre4ac2 (sheesh the version
numbers.....) CSS on ATAPI DVD ROM drives has stopped working.

Playing a CSS disc (using xine) causes a complete system hang (machine
doesn't ping - sysrq-b still works) on test13pre4ac2.  On test12 it is
still OK.

This is on an Alpha LX164.

Dave

-- 
 ---------------- Have a happy GNU millennium! ----------------------   
/ Dr. David Alan Gilbert      | Running GNU/Linux on       |  Happy  \ 
\   gro.gilbert @ treblig.org |  Alpha, x86, ARM and SPARC |  In Hex /
 \ ___________________________|___ http://www.treblig.org  |________/

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Re: css hang; somewhere between test12 and test13pre4ac2

[Mohammad A. Haque]

Works fine under test13-pre4 here on a x86 and an ATAPI Creative 2x dvd
drive using xine or dxr2 player.

Dave Gilbert wrote:
> 
> Hi,
>   Somewhere between test12 and test13pre4ac2 (sheesh the version
> numbers.....) CSS on ATAPI DVD ROM drives has stopped working.
> 
> Playing a CSS disc (using xine) causes a complete system hang (machine
> doesn't ping - sysrq-b still works) on test13pre4ac2.  On test12 it is
> still OK.
> 
> This is on an Alpha LX164.

-- 

=====================================================================
Mohammad A. Haque                              http://www.haque.net/ 
                                               mhaque@haque.net

  "Alcohol and calculus don't mix.             Project Lead
   Don't drink and derive." --Unknown          http://wm.themes.org/
                                               batmanppc@themes.org
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Re: css hang; somewhere between test12 and test13pre4ac2

[Mohammad A. Haque]

Actually... I just remembered that I have my kernel patched to bring it
up-to-date with udf cvs.

Dave Gilbert wrote:
> 
> Hi,
>   Somewhere between test12 and test13pre4ac2 (sheesh the version
> numbers.....) CSS on ATAPI DVD ROM drives has stopped working.
> 
> Playing a CSS disc (using xine) causes a complete system hang (machine
> doesn't ping - sysrq-b still works) on test13pre4ac2.  On test12 it is
> still OK.
> 
> This is on an Alpha LX164.

-- 

=====================================================================
Mohammad A. Haque                              http://www.haque.net/ 
                                               mhaque@haque.net

  "Alcohol and calculus don't mix.             Project Lead
   Don't drink and derive." --Unknown          http://wm.themes.org/
                                               batmanppc@themes.org
=====================================================================
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Re: css hang; somewhere between test12 and test13pre4ac2

[Jens Axboe]

On Sun, Dec 24 2000, Dave Gilbert wrote:
> Hi,
>   Somewhere between test12 and test13pre4ac2 (sheesh the version
> numbers.....) CSS on ATAPI DVD ROM drives has stopped working.
> 
> Playing a CSS disc (using xine) causes a complete system hang (machine
> doesn't ping - sysrq-b still works) on test13pre4ac2.  On test12 it is
> still OK.
> 
> This is on an Alpha LX164.

The most likely suspect (as someone else pointed out) is not at
all css (I'm not even sure what you mean by css hang?) but UDF.
Given the fs changes. Since sysrq still works, it would help a
lot if you could capture sysrq-p repeatedly and send it in.

Do you have any non-css discs to beat on UDF?

-- 
* Jens Axboe <axboe@suse.de>
* SuSE Labs
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Re: css hang; somewhere between test12 and test13pre4ac2

[Dave Gilbert]

On Mon, 25 Dec 2000, Jens Axboe wrote:

> The most likely suspect (as someone else pointed out) is not at
> all css (I'm not even sure what you mean by css hang?) but UDF.

I mean a complete system hang when playing a CSS disc - doesn't even ping.
Doesn't recover.

> Given the fs changes. Since sysrq still works, it would help a
> lot if you could capture sysrq-p repeatedly and send it in.

I think at this point the only thing that works is sysrq-b - at least the
sysrq-u's and sysrq-s's that I've given don't seem to have cleanly
unmounted the file system.
 
> Do you have any non-css discs to beat on UDF?


Yep one disc (Scanners) - it is fine - hence my reason for beleiving it is
a CSSism (although I guess CSS makes other demands on the UDF code).

Dave

-- 
 ---------------- Have a happy GNU millennium! ----------------------   
/ Dr. David Alan Gilbert      | Running GNU/Linux on       |  Happy  \ 
\   gro.gilbert @ treblig.org |  Alpha, x86, ARM and SPARC |  In Hex /
 \ ___________________________|___ http://www.treblig.org  |________/

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Re: css hang; somewhere between test12 and test13pre4ac2

[Jens Axboe]

[-- Attachment #1: Type: text/plain, Size: 1090 bytes --]

On Mon, Dec 25 2000, Dave Gilbert wrote:
> > The most likely suspect (as someone else pointed out) is not at
> > all css (I'm not even sure what you mean by css hang?) but UDF.
> 
> I mean a complete system hang when playing a CSS disc - doesn't even ping.
> Doesn't recover.

Hmm

> > Given the fs changes. Since sysrq still works, it would help a
> > lot if you could capture sysrq-p repeatedly and send it in.
> 
> I think at this point the only thing that works is sysrq-b - at least the
> sysrq-u's and sysrq-s's that I've given don't seem to have cleanly
> unmounted the file system.

Could you at least check? You may need some sort of serial console too..

> > Do you have any non-css discs to beat on UDF?
> 
> Yep one disc (Scanners) - it is fine - hence my reason for beleiving it is
> a CSSism (although I guess CSS makes other demands on the UDF code).

Not so. Once a css "session" has been established, data is read just
like off any other CD. But try with this patch applied, it could be
a NULL pointer deref at the wrong time.

-- 
* Jens Axboe <axboe@suse.de>
* SuSE Labs

[-- Attachment #2: idecd_log-2 --]
[-- Type: text/plain, Size: 268 bytes --]

--- drivers/ide/ide-cd.c~	Sat Dec 23 23:59:52 2000
+++ drivers/ide/ide-cd.c	Sun Dec 24 00:03:38 2000
@@ -333,7 +333,7 @@
 {
 	int log = 0;
 
-	if (sense == NULL || pc->quiet)
+	if (sense == NULL || pc == NULL || pc->quiet)
 		return 0;
 
 	switch (sense->sense_key) {

Re: css hang; somewhere between test12 and test13pre4ac2

[Dave Gilbert]

Hi Jens,
  Thanks for the patch; unfortunatly at the moment I can neither confirm
or deny whether the patch works - since the damn thing won't crash on me
with or without the patch - I suspect it depends on system mood.

But I have a PDA logging console so if it happens I should catch it.

Thanks again,

Dave

-- 
 ---------------- Have a happy GNU millennium! ----------------------   
/ Dr. David Alan Gilbert      | Running GNU/Linux on       |  Happy  \ 
\   gro.gilbert @ treblig.org |  Alpha, x86, ARM and SPARC |  In Hex /
 \ ___________________________|___ http://www.treblig.org  |________/

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Re: css hang; somewhere between test12 and test13pre4ac2

[Mohammad A. Haque]

This is confirmed. mounting css dics causes oops. non-css discs work
fine. 

oops coming soon.

Jens Axboe wrote:
> The most likely suspect (as someone else pointed out) is not at
> all css (I'm not even sure what you mean by css hang?) but UDF.
> Given the fs changes. Since sysrq still works, it would help a
> lot if you could capture sysrq-p repeatedly and send it in.
> 
> Do you have any non-css discs to beat on UDF?
> 
> --
> * Jens Axboe <axboe@suse.de>
> * SuSE Labs
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> Please read the FAQ at http://www.tux.org/lkml/

-- 

=====================================================================
Mohammad A. Haque                              http://www.haque.net/ 
                                               mhaque@haque.net

  "Alcohol and calculus don't mix.             Project Lead
   Don't drink and derive." --Unknown          http://wm.themes.org/
                                               batmanppc@themes.org
=====================================================================
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Re: css hang; somewhere between test12 and test13pre4ac2

[Jens Axboe]

On Mon, Dec 25 2000, Mohammad A. Haque wrote:
> This is confirmed. mounting css dics causes oops. non-css discs work
> fine. 
> 
> oops coming soon.

Thanks. If it's the cdrom_log_sense oops, please try also with
previously sent patch.

-- 
* Jens Axboe <axboe@suse.de>
* SuSE Labs
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Re: css hang; somewhere between test12 and test13pre4ac2

[Mohammad A. Haque]

Heh, just go it. Testing....

Jens Axboe wrote:
> 
> Thanks. If it's the cdrom_log_sense oops, please try also with
> previously sent patch.

-- 

=====================================================================
Mohammad A. Haque                              http://www.haque.net/ 
                                               mhaque@haque.net

  "Alcohol and calculus don't mix.             Project Lead
   Don't drink and derive." --Unknown          http://wm.themes.org/
                                               batmanppc@themes.org
=====================================================================
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To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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