Messages in this thread | | | From | Martin van Es <> | Subject | Kernel 2.6.17.1 bug/oops in snd_usb_audio subsystem | Date | Fri, 14 Jul 2006 11:54:36 +0200 |
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Hi,
I already sent this mail to perex@suse.cz a couple of days ago since I thought that was the closest match in the MAINTAINERS list for this oops. Since I didn't receive any reply I am not sure if the information in this mail is known to the developing community so I'll send a one time copy to the list. Please forgive me for not being a member of the list, I just happen to follow (stable) kernel development and stumbled upon this oops...
If there's anything I forgot, or should test/send to this list or person, please CC me on the reply.
Regards, Martin van Es
-- original message --
Device: The mentioned usb SOUND device is part of a philips webcam, dmesg output: pwc: Philips PCVC675K (Vesta) USB webcam detected.
and registers as /dev/dsp1
I was able to reproduce the bug every time I start up ffmpeg (using /dev/dsp1) in 2.6.17.1, but for 1 time. I tried the same with 2.6.16 (only) once which worked fine.
Maybe helpful: I deselected support for old ALSA API in 2.6.17.1
I didn't find a reference to the snd_usb_audio subsystem in recent 2.6.17 releases (> .1) changelog so didn't try to compile a new version of the 2.6.17.x kernel.
Grtz. Martin van Es
dmesg output:
BUG: unable to handle kernel NULL pointer dereference at virtual address 000001b8 printing eip: deae2514 *pde = 00000000 Oops: 0002 [#1] Modules linked in: snd_usb_audio pwc snd_usb_lib videodev v4l2_common snd_rawmidi snd_hwdep capability commoncap kqemu ipw2200 CPU: 0 EIP: 0060:[<deae2514>] Tainted: P VLI EFLAGS: 00210202 (2.6.17.1 #5) EIP is at snd_usb_pcm_open+0x34/0x4d0 [snd_usb_audio] eax: db67e780 ebx: 00000000 ecx: 0000000e edx: 000001a8 esi: deaf0d20 edi: c5be1e50 ebp: c56379c0 esp: c5be1d9c ds: 007b es: 007b ss: 0068 Process ffmpeg (pid: 19504, threadinfo=c5be0000 task=c678aa70) Stack: 00000020 c5be1dd8 00000000 d1d49000 00000010 c56379c0 c030f7f4 d1d49000 00000000 00000010 d1d49000 000001a8 00000011 0000000b ffffffff cfcdf600 00000000 0000000d c5be1e50 c56379c0 c030fb17 db67e780 00000001 c61a4c80 Call Trace: <c030f7f4> snd_pcm_hw_constraints_init+0x704/0x790 <c030fb17> snd_pcm_open_substream+0x57/0xb0 <c031df41> snd_pcm_oss_open+0x221/0x4a0 <c0163800> generic_permission+0x110/0x120 <c02126c7> kobject_get+0x17/0x20 <c01185c0> default_wake_function+0x0/0x20 <c030482d> soundcore_open+0x8d/0x1c0 <c015e826> chrdev_open+0x76/0x160 <c015e7b0> chrdev_open+0x0/0x160 <c0153aeb> __dentry_open+0xbb/0x200 <c0153d4c> do_filp_open+0x5c/0x70 <c01539cb> get_unused_fd+0x5b/0xc0 <c0153db3> do_sys_open+0x53/0x100 <c0153eb7> sys_open+0x27/0x30 <c0102f47> syscall_call+0x7/0xb Code: 8b 48 5c 8d 14 52 fc 89 4c 24 28 89 d1 c1 e1 04 01 ca b9 0e 00 00 00 8d 14 d5 10 00 00 00 89 54 24 2c 8b 58 08 01 da 89 54 24 2c <c7> 42 10 ff ff ff ff c7 42 24 00 00 00 00 8b 7c 24 28 81 c7 d0 EIP: [<deae2514>] snd_usb_pcm_open+0x34/0x4d0 [snd_usb_audio] SS:ESP 0068:c5be1d9c
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