linux-kernel - Re: WARNING: at sound/core/sound_oss.c:96 snd_oss_kernel

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Date:	Mon, 18 Jan 2010 12:36:38 +0100
From:	John Kacur <jkacur@...hat.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org
Subject: Re: WARNING: at sound/core/sound_oss.c:96 snd_oss_kernel_minor+0xdf/0x120 
	[snd]()

On Mon, Jan 18, 2010 at 12:28 PM, Takashi Iwai <tiwai@...e.de> wrote:
> At Mon, 18 Jan 2010 09:15:23 +0100,
> John Kacur wrote:
>>
>> On Tue, Jan 12, 2010 at 9:57 AM, Takashi Iwai <tiwai@...e.de> wrote:
>> > At Wed, 6 Jan 2010 17:53:24 +0100,
>> > John Kacur wrote:
>> >>
>> >> The following was in my 2.6.33-rc3 dmesg (of course that doesn't mean
>> >> that the problem didn't exist earlier too)
>> >>
>> >> WARNING: at /home/jkacur/rt.linux.git/sound/core/sound_oss.c:96
>> >> snd_oss_kernel_minor+0xdf/0x120 [snd]()
>> >> Hardware name: 2241B48
>> >> BUG? (minor < 0 || minor >= 128)
>> >> Modules linked in: snd_mixer_oss thinkpad_acpi(+) sdhci hwmon i2c_i801
>> >> firewire_ohci snd_pcm mmc_core snd_timer cfg80211 firewire_core btusb
>> >> joydev iTCO_wdt bluetooth ata_generic e1000e i2c_core ppdev snd
>> >> battery ac iTCO_vendor_support parport_pc ricoh_mmc intel_agp
>> >> pata_acpi pcspkr parport tpm_tis video wmi output soundcore button tpm
>> >> rfkill sr_mod tpm_bios snd_page_alloc crc_itu_t cdrom sg ahci libata
>> >> sd_mod scsi_mod crc_t10dif xfs exportfs uhci_hcd ohci_hcd ehci_hcd
>> >> [last unloaded: scsi_wait_scan]
>> >> Pid: 1317, comm: modprobe Not tainted 2.6.33-rc3 #1
>> >> Call Trace:
>> >>  [<ffffffffa027bb25>] ? snd_oss_kernel_minor+0xdf/0x120 [snd]
>> >>  [<ffffffff8104338c>] warn_slowpath_common+0x7c/0xa9
>> >>  [<ffffffff81043410>] warn_slowpath_fmt+0x41/0x43
>> >>  [<ffffffffa027bb25>] snd_oss_kernel_minor+0xdf/0x120 [snd]
>> >>  [<ffffffffa027bc7e>] snd_register_oss_device+0x2c/0x21a [snd]
>> >>  [<ffffffffa0271e1e>] snd_mixer_oss_notify_handler+0xa5/0x2e5 [snd_mixer_oss]
>> >>  [<ffffffff81375e00>] ? __mutex_unlock_slowpath+0x5c/0x141
>> >>  [<ffffffff810710d5>] ? trace_hardirqs_on_caller+0x11f/0x14a
>> >>  [<ffffffff8107110d>] ? trace_hardirqs_on+0xd/0xf
>> >> sdhci-pci 0000:15:00.2: SDHCI controller found [1180:0822] (rev 21)
>> >> sdhci-pci 0000:15:00.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18
>> >>  [<ffffffff81375ed3>] ? __mutex_unlock_slowpath+0x12f/0x141
>> >> sdhci-pci 0000:15:00.2: Will use DMA mode even though HW doesn't fully
>> >> claim to support it.
>> >> Registered led device: mmc0::
>> >> mmc0: SDHCI controller on PCI [0000:15:00.2] using DMA
>> >>  [<ffffffffa027628a>] snd_card_register+0x135/0x14b [snd]
>> >>  [<ffffffffa0370c88>] volume_init+0x335/0x3d2 [thinkpad_acpi]
>> >>  [<ffffffffa037289b>] thinkpad_acpi_module_init+0x61f/0xa4f [thinkpad_acpi]
>> >>  [<ffffffffa037227c>] ? thinkpad_acpi_module_init+0x0/0xa4f [thinkpad_acpi]
>> >>  [<ffffffff810001fa>] do_one_initcall+0x5f/0x154
>> >>  [<ffffffff8107ff34>] sys_init_module+0xd7/0x234
>> >>  [<ffffffff81002d5b>] system_call_fastpath+0x16/0x1b
>> >> ---[ end trace a6d53dc318f09cb5 ]---
>> >
>> > Looks like the code path from thinkpad-acpi...
>> >
>> > Could you add some printk's in sound/core/sound_oss.c:snd_oss_kernel_minor()
>> > to inspect which values are taken and calculated?
>> >
>>
>> I'm getting a card->number equal to 29, and a dev equal to 0.
>
> The card number 29 is very strange.  Is it the correct number?
> You can see the sound instances in /proc/asound/cards.
>
>> The case is SNDRV_OSS_DEVICE_TYPE_MIXER:
>> So that does  minor = SNDRV_MINOR_OSS(card->number, (dev ?
>> SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
>> and according to the formula #define SNDRV_MINOR_OSS(card,
>> dev)  (((card) << 4) | (dev))
>> That works out to 464 which of course is not in the acceptable range
>> between 0 and 128.
>
> Do you build thinkpad-acpi as a module or built-in?  How about the
> sound stuff?
>
>
> Takashi
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 cat /proc/asound/card
card0/  card29/ cards
[jkacur@...ho rt.linux.git]$ cat /proc/asound/cards
 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xfc020000 irq 31
29 [ThinkPadEC     ]: ThinkPad EC - ThinkPad Console Audio Control
                      ThinkPad Console Audio Control at EC reg 0x30,
fw 7VHT12WW-1.01

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