Segfault in libasound

hrak · 2007-12-10 14:21

On Gentoo using alsa-lib 1.0.15 (also tested with 1.0.14) using svn rev 10952

no system asound.conf and no user .asoundrc

Quote:CPlayerCoreFactor::GetPlayers(/home/hans/media/vids/test.avi)
DVDPlayer: Opening: /home/hans/media/vids/test.avi
CDVDPlayer::CloseFile()
CDVDMessageQueue::Put MSGQ_NOT_INITIALIZED
DVDPlayer: waiting for threads to exit
DVDPlayer: finished waiting
CDVDMessageQueue::Put MSGQ_NOT_INITIALIZED
Running thread 2947992464
thread start, auto delete: 0
Creating InputStream
Creating Demuxer
SECTION:LoadDLL(Q:\system\players\dvdplayer\avutil-51-i486-linux.so)
Loading: /home/hans/dev/xbmc/branches/linuxport/XBMC/BUILD/system/players/dvdplayer/avutil-51-i486-linux.so
SECTION:LoadDLL(Q:\system\players\dvdplayer\avcodec-51-i486-linux.so)
Loading: /home/hans/dev/xbmc/branches/linuxport/XBMC/BUILD/system/players/dvdplayer/avcodec-51-i486-linux.so
DllAvCodec loaded
SECTION:LoadDLL(Q:\system\players\dvdplayer\avformat-51-i486-linux.so)
Loading: /home/hans/dev/xbmc/branches/linuxport/XBMC/BUILD/system/players/dvdplayer/avformat-51-i486-linux.so
ffmpeg: Input #0, avi, from '/home/hans/media/vids/test.avi':
ffmpeg: Duration: 01:13:52.4, start: 0.000000, bitrate: 1325 kb/s
ffmpeg: Stream #0.0: Video: mpeg4, yuv420p, 640x272 [PAR 1:1 DAR 40:17], 23.98 tb®
ffmpeg: Stream #0.1: Audio: ac3, 48000 Hz, 5:1, 448 kb/s
CDVDFactorySubtitle::GetSubtitles, searching subtitles
CacheSubtitles: START
CacheSubtitles: Checking for common subirs...
CacheSubtitles: Done (time: 2 ms)
CacheSubtitles: Searching for subtitles...
CacheSubtitles: Done (time: 0 ms)
CacheSubtitles: END (total time: 3 ms)
CDVDFactorySubtitle::GetSubtitles, searching subtitles done
Opening audio stream: 1
Finding audio codec for: 86020
FactoryCodec - Audio: passthrough - Opening
FactoryCodec - Audio: passthrough - Failed
FactoryCodec - Audio: liba52 - Opening
SECTION:LoadDLL(Q:\system\players\dvdplayer\liba52-i486-linux.so)
Loading: /home/hans/dev/xbmc/branches/linuxport/XBMC/BUILD/system/players/dvdplayer/liba52-i486-linux.so
FactoryCodec - Audio: liba52 - Opened
Creating audio thread
Running thread 2956385168
thread start, auto delete: 0
running thread: CDVDPlayerAudio::Process()
Opening video stream: 0
Creating video codec with codec id: 13
FactoryCodec - Video: FFmpeg - Opening
DllAvCodec loaded
SECTION:LoadDLL(Q:\system\players\dvdplayer\swscale-51-i486-linux.so)
Loading: /home/hans/dev/xbmc/branches/linuxport/XBMC/BUILD/system/players/dvdplayer/swscale-51-i486-linux.so
FactoryCodec - Video: FFmpeg - Opened
Creating video thread
Running thread 2964777872
thread start, auto delete: 0
Constructing surface
GLX Info: Using destination window
GLX Info: Creating shared context
Playback has started
Creating audio device with codec id: 86020, channels: 6, sample rate: 48000, no pass-through
CALSADirectSound::CALSADirectSound - opening alsa device
ffmpeg: [NULL] frame skip 8
ffmpeg: [NULL] frame skip 8
GL: OpenGL version 2.1 detected
GL: NPOT textures are supported natively
DllAvCodec loaded
GL: Selecting YUV 2 RGB Progressive Shader
GL: Shader compilation log:

GL: Shader compilation log:

------------------- GUI_MSG_WINDOW_INIT -------------------
Loading skin file: VideoOverlay.xml
running thread: video_thread
ffmpeg: [mpeg4] frame skip 8
ffmpeg: [mpeg4] frame skip 8
fps: 23.976000, pwidth: 640, pheight: 272, dwidth: 640, dheight: 272
OutputPicture- change configuration. 640x272. framerate: 23.98
Display resolution AUTO : PAL 4:3 (6)
GL: OpenGL version 2.1 detected
GL: NPOT textures are supported natively
Segmentation fault (core dumped)

Code:

#0  0xb7e7b307 in snd_config_get_type () from /usr/lib/libasound.so.2

(gdb) bt

#0  0xb7e7b307 in snd_config_get_type () from /usr/lib/libasound.so.2

#1  0x087b51bb in CALSADirectSound (this=0xb22bebc8, pCallback=0x0, iChannels=6, uiSamplesPerSec=48000, uiBitsPerSample=16, bResample=false,

    strAudioCodec=0x88dbcb7 "", bIsMusic=false, bPassthrough=false) at ALSADirectSound.cpp:85

#2  0x087b81c3 in CDVDAudio::Create (this=0xb224c888, audioframe=@0xb01fd12c, codec=CODEC_ID_AC3) at DVDAudio.cpp:76

#3  0x087c7b54 in CDVDPlayerAudio::Process (this=0xb224c788) at DVDPlayerAudio.cpp:393

#4  0x087534b7 in CThread::staticThread (data=0xb224c788) at Thread.cpp:168

#5  0x086ba2e5 in InternalThreadFunc (data=0x8c26e40) at XThreadUtils.cpp:61

#6  0xb7a9552b in ?? () from /usr/lib/libSDL-1.2.so.0

#7  0x08c26e40 in ?? ()

#8  0x086ba276 in _beginthreadex (security=0x8b80050, stack_size=3077484532, start_address=0xb01fd408, arglist=0xb76dc64b, initflag=146276432,

    thrdaddr=0xb01feb90) at XThreadUtils.cpp:126

#9  0xb7ad0c3d in ?? () from /usr/lib/libSDL-1.2.so.0

#10 0x08b80050 in ?? ()

#11 0xb76eaff4 in ?? () from /lib/libpthread.so.0

#12 0xb01fd408 in ?? ()

#13 0xb76dc64b in ?? () from /lib/libpthread.so.0

#14 0x08b80050 in ?? ()

#15 0xb01feb90 in ?? ()

#16 0xb01feb90 in ?? ()

#17 0xb01feb90 in ?? ()

#18 0xb01fd3d0 in ?? ()

#19 0x00000000 in ?? ()

**Jezz_X** · 2007-12-10 14:50

Did you copy the new asound.conf file in our svn userdata dir to your running userdata dir its what we use for downmix now instead of the global ones

**elupus** · 2007-12-10 17:23

not userdata jezz, system...

in either case the log looks like it's getting the device wrong.

CALSADirectSound::CALSADirectSound - opening alsa device

should list the device it's opening.

hrak · 2007-12-10 18:22

The asound.conf from svn (XBMC/system) is also present in BUILD/system so that shouldnt be a problem.

My sound used to work (at least not segfault) so something in recent svn changes broke it. Any ideas?

hrak · 2007-12-10 18:36

In addition to elupus, the segfault occurs before the point where it logs the device used. Actually, it crashes while determining which device to use Smile

(line 85 of ALSADirectSound.cpp)

BTW: My audio output is analog and device is set to "default" in xbmc settings->system->audio hardware.

**elupus** · 2007-12-10 20:15

aah, looks like the global snd_config is null, that way it would fail. should probably make sure it isn't null before trying to copy it.

hrak · 2007-12-11 11:09

Thanks for your fix, it works like a charm now. Even got downmixing going thanks to the new asound.conf! Smile

oizone · 2007-12-21 21:18

How did you actually fix this? I'm having this same problem with my secondary system that uses analog output. (one with digital sound works fine)

I didn't quite get it from elupus's comment to set snd_config to non-null..

**elupus** · 2007-12-22 17:32

i fixed it in source, get me a gdb backtrace and i might be able to help you.

Jezz_X Team-XBMC Skinner Posts: 5,264 Joined: Jun 2006 Reputation: 55 Location: Earth	2007-12-10 14:50 Post: #2 Did you copy the new asound.conf file in our svn userdata dir to your running userdata dir its what we use for downmix now instead of the global ones
	find quote

hrak Junior Member Posts: 42 Joined: Oct 2007 Reputation: 0	2007-12-10 18:22 Post: #4 The asound.conf from svn (XBMC/system) is also present in BUILD/system so that shouldnt be a problem. My sound used to work (at least not segfault) so something in recent svn changes broke it. Any ideas?
	find quote

hrak Junior Member Posts: 42 Joined: Oct 2007 Reputation: 0	2007-12-10 18:36 Post: #5 In addition to elupus, the segfault occurs before the point where it logs the device used. Actually, it crashes while determining which device to use (line 85 of ALSADirectSound.cpp) BTW: My audio output is analog and device is set to "default" in xbmc settings->system->audio hardware.
	find quote

hrak Junior Member Posts: 42 Joined: Oct 2007 Reputation: 0	2007-12-11 11:09 Post: #7 Thanks for your fix, it works like a charm now. Even got downmixing going thanks to the new asound.conf!
	find quote

oizone Junior Member Posts: 2 Joined: Dec 2007 Reputation: 0	2007-12-21 21:18 Post: #8 How did you actually fix this? I'm having this same problem with my secondary system that uses analog output. (one with digital sound works fine) I didn't quite get it from elupus's comment to set snd_config to non-null..
	find quote

elupus Team-XBMC Developer Posts: 3,764 Joined: Mar 2004 Reputation: 2	2007-12-22 17:32 Post: #9 i fixed it in source, get me a gdb backtrace and i might be able to help you. Always read the XBMC online-manual, FAQ and search the forum before posting. Do not e-mail XBMC-Team members directly asking for support. Read/follow the forum rules. For troubleshooting and bug reporting please make sure you read this first.
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