seg fault in libasound

seg fault in libasound

[Jerry Geis]

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

Re: seg fault in libasound include alsa-info

[Jerry Geis]

name=root&type=33&description=/tmp/alsa-info.txt&expiry=&s=Submit+Post&content=
!!################################
!!ALSA Information Script v 0.4.48
!!################################

!!Script ran on: Wed Jun 25 13:40:41 EDT 2008


!!Linux Distribution
!!------------------

Debian GNU/Linux 4.0 \n \l


!!Kernel Information
!!------------------

Kernel release:    2.6.18-6-486
Operating System:  GNU/Linux
Architecture:      i486
Processor:         unknown
SMP Enabled:       No


!!ALSA Version
!!------------

Driver version:     1.0.17rc2
Library version:    1.0.17rc2
Utilities version:  1.0.17rc2


!!Loaded ALSA modules
!!-------------------

snd_usb_audio


!!Soundcards recognised by ALSA
!!-----------------------------

 0 [default        ]: USB-Audio - C-Media USB Headphone Set  
                      C-Media USB Headphone Set   at usb-0000:00:0a.0-1, full speed


!!PCI Soundcards installed in the system
!!--------------------------------------



!!Advanced information - PCI Vendor/Device/Susbsystem ID's
!!--------------------------------------------------------



!!Modprobe options (Sound related)
!!--------------------------------

snd-bt87x: index=-2
snd-cx88_alsa: index=-2
snd-atiixp-modem: index=-2
snd-intel8x0m: index=-2
snd-via82xx-modem: index=-2


!!Loaded sound module options
!!--------------------------

!!Module: snd_usb_audio
async_unlink : Y
device_setup : 0,0,0,0,0,0,0,0
enable : Y,Y,Y,Y,Y,Y,Y,Y
id : <NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>
index : -1,-1,-1,-1,-1,-1,-1,-1
nrpacks : 8
pid : -1,-1,-1,-1,-1,-1,-1,-1
vid : -1,-1,-1,-1,-1,-1,-1,-1

Re: 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

Re: seg fault in libasound

[Clemens Ladisch]

Jerry Geis wrote:
> I am getting a seg fault in alsa.
>
> #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

This is the "assert(bitofs % 8 == 0)" in snd_pcm_channel_area_addr()
in pcm_local.h.  In theory, this means that some sample is not aligned
to a byte boundary, but it should be impossible to get this error.

Do you have any .asoundrc or asound.conf file?  If yes, please remove
them and try again.


Regards,
Clemens

Re: seg fault in libasound

[Jerry Geis]

Clemens Ladisch wrote:
> Jerry Geis wrote:
>   
>> I am getting a seg fault in alsa.
>>
>> #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
>>     
>
> This is the "assert(bitofs % 8 == 0)" in snd_pcm_channel_area_addr()
> in pcm_local.h.  In theory, this means that some sample is not aligned
> to a byte boundary, but it should be impossible to get this error.
>
> Do you have any .asoundrc or asound.conf file?  If yes, please remove
> them and try again.
>
>
> Regards,
> Clemens
>
>   
You are correct. I removed my /etc/asound.conf file and now it does not 
seg fault.
Below is my file. What is wrong with it?

 aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: default [C-Media USB Headphone Set  ], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

 lsusb
Bus 004 Device 001: ID 0000:0000  
Bus 003 Device 002: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter
Bus 003 Device 001: ID 0000:0000  
Bus 002 Device 002: ID 13fe:1f00  
Bus 002 Device 001: ID 0000:0000  
Bus 001 Device 001: ID 0000:0000  

I have used this file many times with NON USB sound devices and it has been fine.

Also - after removing the asound.conf file my sound is a little choppy. Anything I can do about that?

Thank you.

Jerry


-----
 

# Set default sound card
# Useful so that all settings can be changed to a different card here.
pcm.snd_card {
     type hw
     card 0
     device 0
}

# Allow mixing of multiple output streams to this device
pcm.output {
     type dmix
     ipc_key 1024
     ipc_perm 0660 # Sound for everybody in your group!
     slave.pcm "snd_card"

     slave {
          # This stuff provides some fixes for latency issues.
          # buffer_size should be set for your audio chipset.
          period_time 0
          period_size 1024
          buffer_size 8192
     }

     bindings {
          0 0
          1 1
     }
}

# Allow reading from the default device.
# Also known as record or capture.
pcm.input {
     type dsnoop
     ipc_key 2048
     slave.pcm "snd_card"

## Possible artsd full duplex fix:
#     slave {
#          period_time 0
#          period_size 1024
#          buffer_size 8192
#     }

     bindings {
          0 0
          1 1
     }
}

# This is what we want as our default device
# a fully duplex (read/write) audio device.
pcm.duplex {
     type asym
     playback.pcm "output"
     capture.pcm "input"
}

###################
# CONVERSION PLUG #
###################
# Setting the default pcm device allows the conversion
# rate to be selected on the fly.
# duplex mode allows any alsa enabled app to read/write
# to the dmix plug (Fixes a problem with wine).
pcm.!default {
     type plug
     slave.pcm "duplex"
}

# Apparently this is wrong (breaks mplayer for me opening the device)
#ctl.!default {
#     type plug
#     slave.pcm "snd_card"
#}

########
# AOSS #
########
# OSS dsp0 device (OSS needs only output support, duplex will break some stuff)
pcm.dsp0 {
     type plug
     slave.pcm "output"
}

# OSS control for dsp0 (needed?...this might not be useful)
ctl.dsp0 {
     type plug
     slave.pcm "snd_card"
}

# OSS control for dsp0 (default old OSS is mixer0)
ctl.mixer0 {
     type plug
     slave.pcm "snd_card"
}