[alsa-devel] alsa-lib(1.0.12) crash

[Cliff Cai]

Hi all,

I'm experiencing weird crash of alsa-lib.
the sound card has 16/24 bit ADC.
The ADC works on 24 bit mode, hw->formats= SNDRV_PCM_FMTBIT_S32_LE,and use 'copy' playback to copy DMA buffer to user space's buffer. 
I ran:
arecord -t wav -c 2 -f U8 -r 8000 -d 5 a.wav 

then arecord crash with following information:

Data access misaligned address violation
 - Attempted misaligned data memory or data cache access.

 RETE:  /* Maybe null pointer? */
 RETN:  /* unknown address */
 RETX:  [ /usr/lib/libasound.so.2 + 0x46da8 ]
 RETS:  [ /usr/lib/libasound.so.2 + 0x46aec ]
 PC  :  [ /usr/lib/libasound.so.2 + 0x46da8 ]
DCPLB_FAULT_ADDR:  [ arecord + 0x2ac ]
ICPLB_FAULT_ADDR:  [ /usr/lib/libasound.so.2 + 0x46da8 ]
Hardware Trace:
   0 Target :  { _trap_c + 0x0 }
     Source :  { _exception_to_level5 + 0xb4 }
   1 Target :  { _exception_to_level5 + 0x0 }
     Source :  { _ex_trap_c + 0x5c }
   2 Target :  { _ex_trap_c + 0x0 }
     Source :  { _trap + 0x28 }
   3 Target :  { _trap + 0x0 }
     Source :  [ /usr/lib/libasound.so.2 + 0x46da6 ]
   4 Target :  [ /usr/lib/libasound.so.2 + 0x46d9a ]
     Source :  [ /usr/lib/libasound.so.2 + 0x46b54 ]
   5 Target :  [ /usr/lib/libasound.so.2 + 0x46b46 ]
     Source :  [ /usr/lib/libasound.so.2 + 0x46b12 ]
   6 Target :  [ /usr/lib/libasound.so.2 + 0x46aec ]
     Source :  [ /usr/lib/libasound.so.2 + 0x4d16a ]
   7 Target :  [ /usr/lib/libasound.so.2 + 0x4d166 ]
     Source :  [ /usr/lib/libasound.so.2 + 0x4d17e ]
   8 Target :  [ /usr/lib/libasound.so.2 + 0x4d17c ]
     Source :  [ /usr/lib/libasound.so.2 + 0x4d0b2 ]
   9 Target :  [ /usr/lib/libasound.so.2 + 0x4d09c ]
     Source :  [ /usr/lib/libasound.so.2 + 0x278ec ]
  10 Target :  [ /usr/lib/libasound.so.2 + 0x278e4 ]
     Source :  [ /usr/lib/libasound.so.2 + 0x46ae8 ]
  11 Target :  [ /usr/lib/libasound.so.2 + 0x46a74 ]
     Source :  [ /usr/lib/libasound.so.2 + 0x28602 ]
  12 Target :  [ /usr/lib/libasound.so.2 + 0x285fa ]
     Source :  [ /usr/lib/libasound.so.2 + 0x46eac ]
  13 Target :  [ /usr/lib/libasound.so.2 + 0x46e94 ]
     Source :  [ /usr/lib/libasound.so.2 + 0x46e8a ]
  14 Target :  [ /usr/lib/libasound.so.2 + 0x46e88 ]
     Source :  [ /usr/lib/libasound.so.2 + 0x46e38 ]
  15 Target :  [ /usr/lib/libasound.so.2 + 0x46e0e ]
     Source :  [ /usr/lib/libasound.so.2 + 0x4d16a ]

Then I modified the driver ,set the ADC to 16bit mode and set  hw->formats= SNDRV_PCM_FMTBIT_S16_LE
no crash any more.

Any idea is appreciated.
Thanks a lot in advance!

Cliff
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