[ALSA - driver 0000344]: usx2y driver causes kernel oops

[noreply@alsa-project.org]

A BUGNOTE has been added to this bug.
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https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000344
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Reported By:                maggoi
Assigned To:                karsten
======================================================================
Project:                    ALSA - driver
Bug ID:                     344
Category:                   USB - usb-usx2y
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
Distribution:               Gentoo
Kernel Version:             2.6.6
======================================================================
Date Submitted:             06-24-2004 18:06 CEST
Last Modified:              06-29-2004 10:45 CEST
======================================================================
Summary:                    usx2y driver causes kernel oops
Description: 
While playing a soundfile using my Tascam us-122 (Alsa Module snd-usx2y)
after a few seconds the sound stutters and i get an Kernel oops. 
This is not happening if I use Jack.
I'm using the latest alsa drivers 1.0.5. With kernel 2.6.6. 

dmesg:
Debug: sleeping function called from invalid context at mm/slab.c:1996
in_atomic():1, irqs_disabled():1
 [<c01152f7>] __might_sleep+0xb7/0xe0
 [<c013be33>] __kmalloc+0xa3/0xb0
 [<c026dad1>] usb_alloc_urb+0x21/0x60
 [<f89b3775>] snd_usX2Y_substream_prepare+0xd5/0x1c0 [snd_usb_usx2y]
 [<f89b3397>] snd_usX2Y_urb_play_start+0xa7/0x170 [snd_usb_usx2y]
 [<f89b35bf>] snd_usX2Y_pcm_play_trigger+0x3f/0x50 [snd_usb_usx2y]
 [<f89490e8>] snd_pcm_do_start+0x28/0x30 [snd_pcm]
 [<f8948dc9>] snd_pcm_action_single+0x39/0x70 [snd_pcm]
 [<f8948f12>] snd_pcm_action_lock_irq+0x92/0x1e0 [snd_pcm]
 [<c0112a8c>] do_page_fault+0x34c/0x54e
 [<f894c4d7>] snd_pcm_common_ioctl1+0x167/0x2f0 [snd_pcm]
 [<f894c6c0>] snd_pcm_playback_ioctl1+0x60/0x3b0 [snd_pcm]
 [<c0150a32>] vfs_write+0xd2/0x130
 [<c0162f20>] sys_ioctl+0x100/0x270
 [<c010413b>] syscall_call+0x7/0xb



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----------------------------------------------------------------------
 karsten - 06-24-2004 22:17 CEST 
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As a test please replace all occurrences of GFP_KERNEL in 
function snd_usX2Y_substream_prepare() with GFP_ATOMIC.
That function is in alsa-driver/usb/usx2y/usbusx2yaudio.c.

Thanks for debugging.

----------------------------------------------------------------------
 maggoi - 06-28-2004 09:51 CEST 
----------------------------------------------------------------------
Thank's a lot, this has solved the issue. Will you include this fix in
further versions?

----------------------------------------------------------------------
 maggoi - 06-28-2004 10:34 CEST 
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Sorry i was to fast. The old error message has gone, but after aprox. 10
min. of listening to a mp3 file by xmms (alsa plugin) the sound becomes
completely distorted. I don't if this dmesg output is alsa related:
ALSA
/var/tmp/portage/alsa-driver-1.0.5a/work/alsa-driver-1.0.5a/alsa-kernel/usb/usbmidi.c:149:
urb status -108
ALSA
/var/tmp/portage/alsa-driver-1.0.5a/work/alsa-driver-1.0.5a/alsa-kernel/usb/usbmidi.c:134:
usb_submit_urb: -32
    ACPI-0279: *** Error: Looking up [BST0] in namespace,
AE_ALREADY_EXISTS
    ACPI-1133: *** Error: Method execution failed [\_SB_.BAT0._BST] (Node
f7fbe928), AE_ALREADY_EXISTS

----------------------------------------------------------------------
 karsten - 06-28-2004 21:04 CEST 
----------------------------------------------------------------------
The "ALSA......" lines are indeed ALSA-related. That issue is fixed in cvs
and shouldn't harm pcm playback.
The ACPI errors could cause distortion.
Please switch off the acpi-deamon.
Here I would do this as su with "/etc/init.d/acpid stop".
You could also use the kernel boot option acpi=off.
And yes, there will be a fix for the "Debug: sleeping function called from
invalid context" error. It will be a rearangement of some functions; more
complicated than this test-fix.

----------------------------------------------------------------------
 maggoi - 06-29-2004 10:45 CEST 
----------------------------------------------------------------------
Sorry, with alsa related i meant the acpi lines. But anyway, does this mean
that the usx2y driver will not work with acpi at all? I used my tascam
us-122 under WinXP and had also issues with drop outs while acpi was
switched on.
Thanks for your efford.

Bug History
Date Modified  Username       Field                    Change              
======================================================================
06-24-04 18:06 maggoi         New Bug                                      
06-24-04 18:06 maggoi         Distribution              => Gentoo          
06-24-04 18:06 maggoi         Kernel Version            => 2.6.6           
06-24-04 22:17 karsten        Bugnote Added: 0001337                       
06-28-04 09:51 maggoi         Bugnote Added: 0001343                       
06-28-04 10:34 maggoi         Bugnote Added: 0001344                       
06-28-04 21:04 karsten        Bugnote Added: 0001346                       
06-29-04 10:45 maggoi         Bugnote Added: 0001347                       
======================================================================




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