[alsa-devel] seg fault in libasound

[Jerry Geis]

Jerry Geis wrote:
> I am running asterisk on debian Etch , i486 with math emulation in 
> kernel. Verified by /boot/config-file.
> I am getting a seg fault in alsa. First I ran straight debian with 
> alsa install.  I got the same seg fault.
> Second I installed 1.0.16 and I still get the seg fault.
> Third I installed 1.0.17rc2 and I still get the seg fault.
> Posted to users first and stan suggested I post to devel.
>
> Below is the trace. I am only using the Console/Dsp from asterisk at 
> this point.
> Which is the interface to the soundcard and alsa.
> What shall I do?
>
> Jerry
>
> --------------------------
>
> Program received signal SIGABRT, Aborted.
> [Switching to Thread -1224033360 (LWP 2440)]
> 0xb7d77947 in raise () from /lib/tls/libc.so.6
> (gdb) where
> #0  0xb7d77947 in raise () from /lib/tls/libc.so.6
> #1  0xb7d790c9 in abort () from /lib/tls/libc.so.6
> #2  0xb7d7105f in __assert_fail () from /lib/tls/libc.so.6
> #3  0xb741861f in snd_pcm_area_copy (dst_area=0x81cc62c, dst_offset=0, 
>    src_area=0x81cb7ec, src_offset=5223, samples=816,    
> format=SND_PCM_FORMAT_S16_LE) at pcm_local.h:499
> #4  0xb744b7b7 in snd_pcm_dsnoop_sync_ptr (pcm=0x81cb930) at 
> pcm_dsnoop.c:77
> #5  0xb7410b11 in snd_pcm_hwsync (pcm=0x81cb930) at pcm.c:932
> #6  0xb7422b55 in snd1_pcm_generic_hwsync (pcm=0x81cc1c8) at 
> pcm_generic.c:143
> #7  0xb7410b11 in snd_pcm_hwsync (pcm=0x81cc1c8) at pcm.c:932
> #8  0xb742fb4d in snd_pcm_rate_hwsync (pcm=0x81cc3f8) at pcm_rate.c:624
> #9  0xb7410b11 in snd_pcm_hwsync (pcm=0x81cc3f8) at pcm.c:932
> #10 0xb7417817 in snd1_pcm_read_areas (pcm=0x81cc3f8, 
> areas=0xb70a5b70,    offset=0, size=160, func=0xb7421e10 
> <snd_pcm_mmap_read_areas>)
>    at pcm.c:6376
> #11 0xb742111f in snd_pcm_mmap_readi (pcm=0x81cc3f8, 
> buffer=0xb74a5a40,    size=160) at pcm_mmap.c:236
> #12 0xb740fff4 in snd_pcm_readi (pcm=0x81cc038, buffer=0xb74a5a40, 
> size=2440)
>    at pcm_local.h:521
> #13 0xb749579b in alsa_read (chan=0x8213f18) at chan_alsa.c:683
> #14 0x080855b1 in __ast_read (chan=0x8213f18, dropaudio=0) at 
> channel.c:2100
> #15 0x08087725 in ast_channel_bridge (c0=0x8212858, c1=0x817cf68,    
> config=0xb70a6eac, fo=0xb70a5fe8, rc=0xb70a5fe4) at channel.c:2380
> #16 0xb7c75592 in ast_bridge_call (chan=0x8212858, peer=0x8213f18,    
> config=0xb70a6eac) at res_features.c:1490
> #17 0xb75c38fd in dial_exec_full (chan=0x8212858, data=0xb70a8fd8,    
> peerflags=0xb70a6f84, continue_exec=0x0) at app_dial.c:1773
> #18 0xb75c519d in dial_exec (chan=0x8212858, data=0xb70a8fd8)
>    at app_dial.c:1827
> #19 0x080c6e3f in pbx_extension_helper (c=0x8212858, con=0x0,    
> context=0x82129d8 "smvoice", exten=0x8212a28 "s",    priority=3, 
> label=0x0, callerid=0x8215450 "404", action=E_SPAWN)
>    at pbx.c:537
> #20 0x080c9185 in __ast_pbx_run (c=0x8212858) at pbx.c:2317
> #21 0x080c9ebe in pbx_thread (data=0x8212858) at pbx.c:2636
> #22 0x080f51d2 in dummy_start (data=0x8213178) at utils.c:909
> #23 0xb7eff0bd in start_thread () from /lib/tls/libpthread.so.0
> #24 0xb7e1b01e in clone () from /lib/tls/libc.so.6
>
>
This seems to be 100% realted to usb-audio.
I Bus 002 Device 003: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter

I had a centos box worked fine. I disabled the on board audio. put my 
usb device in
and it is behaving the same way. plays wave files but asterisk dies.

I  have been searching for a know issue on this or fix but have not 
found one yet.

Any help is appreciated.

Jerry