sound/core/pcm_lib.c:158: BUG

sound/core/pcm_lib.c:158: BUG

[Olaf Hering]

Is this just debug output, or should I be worried about it?

linux-2.6.10-rc3-olh/sound/core/pcm_lib.c:158: BUG: stream = 0, pos = 0x4000, buffer size = 0x4000, period size = 0x1000

This is an ibook2, playing mp3 with xmms, alsa version is 1.0.3, from sles9.
I remember no failures in the last couple hours.


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Re: sound/core/pcm_lib.c:158: BUG

[Lee Revell]

On Sun, 2004-12-19 at 00:53 +0100, Olaf Hering wrote:
> Is this just debug output, or should I be worried about it?
> 
> linux-2.6.10-rc3-olh/sound/core/pcm_lib.c:158: BUG: stream = 0, pos = 0x4000, buffer size = 0x4000, period size = 0x1000
> 
> This is an ibook2, playing mp3 with xmms, alsa version is 1.0.3, from sles9.
> I remember no failures in the last couple hours.

That message indicates that the hardware pointer returned by the pointer
callback was beyond the end of the buffer which should not be possible.

This could indicate an off by one error in the driver, it looks like the
erroneous position is one sample past the end of the buffer.

Lee



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Re: sound/core/pcm_lib.c:158: BUG

[Takashi Iwai]

[-- Attachment #1: Type: text/plain, Size: 777 bytes --]

At Sat, 18 Dec 2004 19:34:12 -0500,
Lee Revell wrote:
> 
> On Sun, 2004-12-19 at 00:53 +0100, Olaf Hering wrote:
> > Is this just debug output, or should I be worried about it?
> > 
> > linux-2.6.10-rc3-olh/sound/core/pcm_lib.c:158: BUG: stream = 0, pos = 0x4000, buffer size = 0x4000, period size = 0x1000
> > 
> > This is an ibook2, playing mp3 with xmms, alsa version is 1.0.3, from sles9.
> > I remember no failures in the last couple hours.
> 
> That message indicates that the hardware pointer returned by the pointer
> callback was beyond the end of the buffer which should not be possible.
> 
> This could indicate an off by one error in the driver, it looks like the
> erroneous position is one sample past the end of the buffer.

Does the patch below work?


Takashi

[-- Attachment #2: Type: text/plain, Size: 584 bytes --]

Index: alsa-kernel/ppc/pmac.c
===================================================================
RCS file: /suse/tiwai/cvs/alsa/alsa-kernel/ppc/pmac.c,v
retrieving revision 1.51
diff -u -r1.51 pmac.c
--- alsa-kernel/ppc/pmac.c	15 Dec 2004 21:45:54 -0000	1.51
+++ alsa-kernel/ppc/pmac.c	20 Dec 2004 14:06:46 -0000
@@ -318,7 +318,8 @@
 	stat = ld_le16(&cp->xfer_status);
 	if (stat & (ACTIVE|DEAD)) {
 		count = in_le16(&cp->res_count);
-		count = rec->period_size - count;
+		if (count)
+			count = rec->period_size - count;
 	}
 #endif
 	count += rec->cur_period * rec->period_size;

Re: sound/core/pcm_lib.c:158: BUG

[Olaf Hering]

 On Mon, Dec 20, Takashi Iwai wrote:

> At Sat, 18 Dec 2004 19:34:12 -0500,
> Lee Revell wrote:
> > 
> > On Sun, 2004-12-19 at 00:53 +0100, Olaf Hering wrote:
> > > Is this just debug output, or should I be worried about it?
> > > 
> > > linux-2.6.10-rc3-olh/sound/core/pcm_lib.c:158: BUG: stream = 0, pos = 0x4000, buffer size = 0x4000, period size = 0x1000
> > > 
> > > This is an ibook2, playing mp3 with xmms, alsa version is 1.0.3, from sles9.
> > > I remember no failures in the last couple hours.
> > 
> > That message indicates that the hardware pointer returned by the pointer
> > callback was beyond the end of the buffer which should not be possible.
> > 
> > This could indicate an off by one error in the driver, it looks like the
> > erroneous position is one sample past the end of the buffer.
> 
> Does the patch below work?

I havent seen that warning since 2 hours, so I guess it helps.


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