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Subjectsnd_pcm_oss: Oopsen with resampling
Hi,

This code is too weird for me to follow, I would've loved to sent a better
debugged Oops, but I lost it when I found sound/core/oss/plugin_ops.h which
takes addresses of labels and gotos back to a predefined label called
GET_S16_END. Brrr. There is probably a reason for doing it this way but
currently I don't fathom it.

Anyhow, when playing at 22050 Hz, I get the oops below after about 200ms of
sound, at 44010 there is no problem. It doesn't always occur though.

gdb can't trace the line due to the aforementioned goto antics, but the code
mentioned corresponds to this:

get_s16_xx12_xx92: sample = as_u16(src) ^ 0x8000; goto GET_S16_END;
get_s16_xx12_xx21: sample = swab16(as_u16(src)); goto GET_S16_END;
get_s16_xx12_xxA1: sample = swab16(as_u16(src) ^ 0x80); goto GET_S16_END;
get_s16_x123_xx12: sample = as_u32(src) >> 8; goto GET_S16_END;
get_s16_x123_xx92: sample = (as_u32(src) >> 8) ^ 0x8000; goto GET_S16_END;

I have the following modules loaded in my gcc 3.3 compiled 2.5.70 (Debian
Unstable):

$ sudo lsmod
Module Size Used by
snd_pcm_oss 47140 0
snd_mixer_oss 16512 1 snd_pcm_oss
snd_via82xx 15524 0
snd_pcm 78752 2 snd_pcm_oss,snd_via82xx
snd_timer 19716 1 snd_pcm
snd_ac97_codec 45828 1 snd_via82xx
snd_page_alloc 7684 2 snd_via82xx,snd_pcm
snd_mpu401_uart 5760 1 snd_via82xx
snd_rawmidi 18592 1 snd_mpu401_uart
snd 42500 8
snd_pcm_oss,snd_mixer_oss,snd_via82xx,snd_pcm,snd_timer,snd_ac97_codec,snd_mpu401_uart,snd_rawmidi
usbkbd 6016 0

Oops:

<1>Unable to handle kernel paging request at virtual address e08e7000
printing eip:
e09af98b
*pde = 1fec6067
*pte = 00000000
Oops: 0000 [#3]
CPU: 0
EIP: 0060:[<e09af98b>] Not tainted
EFLAGS: 00010202
EIP is at resample_expand+0x343/0x377 [snd_pcm_oss]
eax: e09af98b ebx: 00000001 ecx: 000ae7ff edx: 8b518e09
esi: e08eaffc edi: db1f5c0c ebp: e08e6ffe esp: d13bde54
ds: 007b es: 007b ss: 0068
Process wavp (pid: 27806, threadinfo=d13bc000 task=caf74780)
Stack: e09ace05 db1f5b80 db0dec80 d13bde80 00008cad d23ffa80 00001000 ffffffff
e09af7af e09af903 e09af98b db1f5bf0 00000000 00000002 00000002 00000000
8e098e09 00000000 00001000 00000800 db1f5b80 d428ee00 e09afe35 db1f5b80
Call Trace:
[<e09ace05>] snd_pcm_plug_playback_channels_mask+0x72/0xd8 [snd_pcm_oss]
[<e09af7af>] resample_expand+0x167/0x377 [snd_pcm_oss]
[<e09af903>] resample_expand+0x2bb/0x377 [snd_pcm_oss]
[<e09af98b>] resample_expand+0x343/0x377 [snd_pcm_oss]
[<e09afe35>] rate_transfer+0x59/0x5d [snd_pcm_oss]
[<e09ad1dd>] snd_pcm_plug_write_transfer+0x95/0xf4 [snd_pcm_oss]
[<e09a934c>] snd_pcm_oss_write2+0xae/0x118 [snd_pcm_oss]
[<c011647b>] default_wake_function+0x0/0x2e
[<e09a9549>] snd_pcm_oss_write1+0x193/0x1ba [snd_pcm_oss]
[<e09ab42f>] snd_pcm_oss_write+0x43/0x5d [snd_pcm_oss]
[<e09ab3ec>] snd_pcm_oss_write+0x0/0x5d [snd_pcm_oss]
[<c01441cf>] vfs_write+0xb0/0x119
[<c01442dd>] sys_write+0x42/0x63
[<c010a62b>] syscall_call+0x7/0xb

Code: 8b 45 00 eb ac 0f b6 45 00 c1 e0 08 eb a3 81 fa 00 80 00 00

Thanks.

--
http://www.PowerDNS.com Open source, database driven DNS Software
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
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