[gentoo-user] A bug in ALSA?

[gentoo-user] A bug in ALSA?

[Yuri K. Shatroff]

Hello gentoo-users,

I've got a Samsung laptop with Intel HDA sound card (Realtek ALC269VB )
Yesterday I updated software (it was about a month old; I did a eix-sync 
and emerge -Du @world) and somehow sound disappeared: the kernel module 
(snd-hda-intel) still loads and the devices get detected (the 
aforementioned Realtek codec and HDMI codecs). alsa-mixer also seems to 
function. At least, it shows the sound card and allows to change volume 
levels. (in /sys there are also entries for sound/card0)
But in KDE, the Kmix complains of the device not working, mpg123 says 
cannot find card 0, etc.
Before the update, everything worked, the kernel version was 3.7.0. I 
even installed kernels 3.7.4, 3.6.11, with many combinations of 
HDA-related options and module parameters, all in vain, now I installed 
3.7.4 with ultra-verbose DEBUG enabled for ALSA and that's what I'm getting:

=== BEGIN /var/log/messages ===
snd_hda_intel 0000:00:1b.0: irq 43 for MSI/MSI-X
ALSA sound/pci/hda/hda_intel.c:3150 chipset global capabilities = 0x4401
ALSA.... (many similar messages)
input: HDA Intel MID Mic as 
/devices/pci0000:00/0000:00:1b.0/sound/card0/input8
input: HDA Intel MID Headphone as 
/devices/pci0000:00/0000:00:1b.0/sound/card0/input9
BUG: unable to handle kernel NULL pointer dereference at 0000000000000005
IP: [<ffffffff811dd420>] strcmp+0x10/0x30
PGD 119028067 PUD 119029067 PMD 0
Oops: 0000 [#1] PREEMPT SMP
...(registers dump)...
Call Trace:
  [<ffffffffa00473d6>] card_id_ok.part.5+0x46/0x80 [snd]
  [<ffffffffa00475fb>] snd_card_set_id_no_lock+0xeb/0x150 [snd]
  [<ffffffffa0047725>] snd_card_register+0xc5/0x290 [snd]
  [<ffffffffa0138a29>] azx_probe_continue+0xa4/0x159 [snd_hda_intel]
  [<ffffffffa0138e81>] azx_probe+0xd9/0x116 [snd_hda_intel]
  [<ffffffff811fb319>] pci_device_probe+0x79/0xb0
  [<ffffffff8126aa4a>] ? driver_sysfs_add+0x7a/0xb0
  [<ffffffff8126abdc>] really_probe+0x5c/0x210
  [<ffffffff8126ae9d>] driver_probe_device+0x1d/0x20
  [<ffffffff8126af3b>] __driver_attach+0x9b/0xa0
  [<ffffffff8126aea0>] ? driver_probe_device+0x20/0x20
  [<ffffffff8126922e>] bus_for_each_dev+0x4e/0x80
  [<ffffffff8126a859>] driver_attach+0x19/0x20
  [<ffffffff8126a410>] bus_add_driver+0x180/0x270
  [<ffffffffa010c000>] ? 0xffffffffa010bfff
  [<ffffffff8126b455>] driver_register+0x75/0x150
  [<ffffffffa010c000>] ? 0xffffffffa010bfff
  [<ffffffff811fa3b3>] __pci_register_driver+0x43/0x50
  [<ffffffffa010c01e>] azx_driver_init+0x1e/0x1000 [snd_hda_intel]
  [<ffffffff810001fa>] do_one_initcall+0x3a/0x160
  [<ffffffff81088bf9>] sys_init_module+0xb9/0x220
  [<ffffffff813bf392>] system_call_fastpath+0x16/0x1b
...
---[ end trace d00fdb0cd6665b52 ]---
=== END /var/log/messages ===

As one can see, the line
 > BUG: unable to handle kernel NULL pointer dereference
indicates a bug, doesn't it?

If it is a bug, what should I do?

(I have ~amd64 in keywords, pulseaudio is disabled, alsa enabled in USE 
flags)

Strangely enough, I've got another laptop (a little newer model of 
Samsung), also with Realtek, and there the software update didn't cause 
any problems.

Thanks in advance for any ideas.

-- 
Best wishes,
Yuri K. Shatroff

Re: [gentoo-user] A bug in ALSA?

[Mick]

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On Thursday 31 Jan 2013 15:39:35 Yuri K. Shatroff wrote:
> Hello gentoo-users,
> 
> I've got a Samsung laptop with Intel HDA sound card (Realtek ALC269VB )
> Yesterday I updated software (it was about a month old; I did a eix-sync
> and emerge -Du @world) and somehow sound disappeared: the kernel module
> (snd-hda-intel) still loads and the devices get detected (the
> aforementioned Realtek codec and HDMI codecs). alsa-mixer also seems to
> function. At least, it shows the sound card and allows to change volume
> levels. (in /sys there are also entries for sound/card0)
> But in KDE, the Kmix complains of the device not working, mpg123 says
> cannot find card 0, etc.
> Before the update, everything worked, the kernel version was 3.7.0. I
> even installed kernels 3.7.4, 3.6.11, with many combinations of
> HDA-related options and module parameters, all in vain, now I installed
> 3.7.4 with ultra-verbose DEBUG enabled for ALSA and that's what I'm
> getting:
> 
> === BEGIN /var/log/messages ===
> snd_hda_intel 0000:00:1b.0: irq 43 for MSI/MSI-X
> ALSA sound/pci/hda/hda_intel.c:3150 chipset global capabilities = 0x4401
> ALSA.... (many similar messages)
> input: HDA Intel MID Mic as
> /devices/pci0000:00/0000:00:1b.0/sound/card0/input8
> input: HDA Intel MID Headphone as
> /devices/pci0000:00/0000:00:1b.0/sound/card0/input9
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000005
> IP: [<ffffffff811dd420>] strcmp+0x10/0x30
> PGD 119028067 PUD 119029067 PMD 0
> Oops: 0000 [#1] PREEMPT SMP
> ...(registers dump)...
> Call Trace:
>   [<ffffffffa00473d6>] card_id_ok.part.5+0x46/0x80 [snd]
>   [<ffffffffa00475fb>] snd_card_set_id_no_lock+0xeb/0x150 [snd]
>   [<ffffffffa0047725>] snd_card_register+0xc5/0x290 [snd]
>   [<ffffffffa0138a29>] azx_probe_continue+0xa4/0x159 [snd_hda_intel]
>   [<ffffffffa0138e81>] azx_probe+0xd9/0x116 [snd_hda_intel]
>   [<ffffffff811fb319>] pci_device_probe+0x79/0xb0
>   [<ffffffff8126aa4a>] ? driver_sysfs_add+0x7a/0xb0
>   [<ffffffff8126abdc>] really_probe+0x5c/0x210
>   [<ffffffff8126ae9d>] driver_probe_device+0x1d/0x20
>   [<ffffffff8126af3b>] __driver_attach+0x9b/0xa0
>   [<ffffffff8126aea0>] ? driver_probe_device+0x20/0x20
>   [<ffffffff8126922e>] bus_for_each_dev+0x4e/0x80
>   [<ffffffff8126a859>] driver_attach+0x19/0x20
>   [<ffffffff8126a410>] bus_add_driver+0x180/0x270
>   [<ffffffffa010c000>] ? 0xffffffffa010bfff
>   [<ffffffff8126b455>] driver_register+0x75/0x150
>   [<ffffffffa010c000>] ? 0xffffffffa010bfff
>   [<ffffffff811fa3b3>] __pci_register_driver+0x43/0x50
>   [<ffffffffa010c01e>] azx_driver_init+0x1e/0x1000 [snd_hda_intel]
>   [<ffffffff810001fa>] do_one_initcall+0x3a/0x160
>   [<ffffffff81088bf9>] sys_init_module+0xb9/0x220
>   [<ffffffff813bf392>] system_call_fastpath+0x16/0x1b
> ...
> ---[ end trace d00fdb0cd6665b52 ]---
> === END /var/log/messages ===
> 
> As one can see, the line
> 
>  > BUG: unable to handle kernel NULL pointer dereference
> 
> indicates a bug, doesn't it?
> 
> If it is a bug, what should I do?
> 
> (I have ~amd64 in keywords, pulseaudio is disabled, alsa enabled in USE
> flags)
> 
> Strangely enough, I've got another laptop (a little newer model of
> Samsung), also with Realtek, and there the software update didn't cause
> any problems.
> 
> Thanks in advance for any ideas.

Hi Yuri, it looks like a kernel bug that causes a kernel oops.  You can search 
https://bugs.gentoo.org/ to see if anyone else has reported it.

-- 
Regards,
Mick

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Re: [gentoo-user] A bug in ALSA?

[Volker Armin Hemmann]

Am 31.01.2013 16:39, schrieb Yuri K. Shatroff:
> Hello gentoo-users,
>
> I've got a Samsung laptop with Intel HDA sound card (Realtek ALC269VB )
> Yesterday I updated software (it was about a month old; I did a
> eix-sync and emerge -Du @world) and somehow sound disappeared: the
> kernel module (snd-hda-intel) still loads and the devices get detected
> (the aforementioned Realtek codec and HDMI codecs). alsa-mixer also
> seems to function. At least, it shows the sound card and allows to
> change volume levels. (in /sys there are also entries for sound/card0)
> But in KDE, the Kmix complains of the device not working, mpg123 says
> cannot find card 0, etc.
> Before the update, everything worked, the kernel version was 3.7.0. I
> even installed kernels 3.7.4, 3.6.11, with many combinations of
> HDA-related options and module parameters, all in vain, now I
> installed 3.7.4 with ultra-verbose DEBUG enabled for ALSA and that's
> what I'm getting:
>
> === BEGIN /var/log/messages ===
> snd_hda_intel 0000:00:1b.0: irq 43 for MSI/MSI-X
> ALSA sound/pci/hda/hda_intel.c:3150 chipset global capabilities = 0x4401
> ALSA.... (many similar messages)
> input: HDA Intel MID Mic as
> /devices/pci0000:00/0000:00:1b.0/sound/card0/input8
> input: HDA Intel MID Headphone as
> /devices/pci0000:00/0000:00:1b.0/sound/card0/input9
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000005
> IP: [<ffffffff811dd420>] strcmp+0x10/0x30
> PGD 119028067 PUD 119029067 PMD 0
> Oops: 0000 [#1] PREEMPT SMP
> ...(registers dump)...
> Call Trace:
>  [<ffffffffa00473d6>] card_id_ok.part.5+0x46/0x80 [snd]
>  [<ffffffffa00475fb>] snd_card_set_id_no_lock+0xeb/0x150 [snd]
>  [<ffffffffa0047725>] snd_card_register+0xc5/0x290 [snd]
>  [<ffffffffa0138a29>] azx_probe_continue+0xa4/0x159 [snd_hda_intel]
>  [<ffffffffa0138e81>] azx_probe+0xd9/0x116 [snd_hda_intel]
>  [<ffffffff811fb319>] pci_device_probe+0x79/0xb0
>  [<ffffffff8126aa4a>] ? driver_sysfs_add+0x7a/0xb0
>  [<ffffffff8126abdc>] really_probe+0x5c/0x210
>  [<ffffffff8126ae9d>] driver_probe_device+0x1d/0x20
>  [<ffffffff8126af3b>] __driver_attach+0x9b/0xa0
>  [<ffffffff8126aea0>] ? driver_probe_device+0x20/0x20
>  [<ffffffff8126922e>] bus_for_each_dev+0x4e/0x80
>  [<ffffffff8126a859>] driver_attach+0x19/0x20
>  [<ffffffff8126a410>] bus_add_driver+0x180/0x270
>  [<ffffffffa010c000>] ? 0xffffffffa010bfff
>  [<ffffffff8126b455>] driver_register+0x75/0x150
>  [<ffffffffa010c000>] ? 0xffffffffa010bfff
>  [<ffffffff811fa3b3>] __pci_register_driver+0x43/0x50
>  [<ffffffffa010c01e>] azx_driver_init+0x1e/0x1000 [snd_hda_intel]
>  [<ffffffff810001fa>] do_one_initcall+0x3a/0x160
>  [<ffffffff81088bf9>] sys_init_module+0xb9/0x220
>  [<ffffffff813bf392>] system_call_fastpath+0x16/0x1b
> ...
> ---[ end trace d00fdb0cd6665b52 ]---
> === END /var/log/messages ===
>
> As one can see, the line
> > BUG: unable to handle kernel NULL pointer dereference
> indicates a bug, doesn't it?

congratulation, you found a kernel bug.

>
> If it is a bug, what should I do?

depends. Gentoo sources?
Go to bugs.gentoo.org.

Vanilla sources?
lkml