My system plays and captures short streams using by dmix device after boot. But that system sometimes go infinity wait state when stream plays. I use alsa-lib-1.0.24.1. but v1.0.27 and 1.0.28 also occur same err. So I have below questions. - What event that poll (in snd_pcm_wait_nocheck) wait? I know snd_pcm_wait function is for wait PCM ready. But I want to know details. - How can I avoid that problem? I changed timeout(in snd_pcm_wait) from -1 to 100. But system go infinity loop.

And I attach status and params when this problem occurred. - status state: RUNNING owner_pid : 1213 trigger_time: 5.285075511 tstamp : 5.333190511 delay : -832 avail : 17216 avail_max : 17216 ----- hw_ptr : 832 appl_ptr : 0 - hw_params access: MMAP_INTERLEAVED format: S16_LE subformat: STD channels: 2 rate: 44100 (44100/1) period_size: 1024 buffer_size: 16384 - sw_params tstamp_mode: ENABLE period_step: 1 avail_min: 1024 start_threshold: 1 stop_threshold: 1073741824 silence_threshold: 0 silence_size: 1073741824 boundary: 1073741824

Please reply about it. Thanks.

----- Eunhee Kim