Problem closing device handle

[igor@eellc.ru]

Hello
I'm developing software which captures audio and plays it from multiple 
sources in parallel.
I'm using plughw:1,0 device to capture and plug:'dmix:SLAVE="hw:1,0"', 
everything works fine (i mean play and capture), but when i try to close 
capture handle -
snd_pcm_close(dev_handle)
i get following output:
ALSA lib pcm_hw.c:370:(snd_pcm_hw_hw_free) SNDRV_PCM_IOCTL_HW_FREE failed: 
File descriptor in bad state
ALSA lib pcm_plug.c:69:(snd_pcm_plug_close) plug slaves mismatch

(second error about slaves mismatch appears not in all situation). 
After some debugging i found out following - 
- this error occures only if i use playback (yes, playback, and error while 
trying to close capture handle). If i don't open playback device - it doesn't 
happens
- after this handle remains open, and i cannot open it again - if i close 
snd_pcm_close again, it finally closes, but it doesn't seems a nice solution
- it happens only when i use dmix plugin, when i use just plug plugin - 
everything is OK

Has anyone comments to this, is it some misconfiguration or something else?
Thanks


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