next-0519 on thinkpad x60: sound related? window manager crash

[Alex Xu (Hello71)]

Excerpts from Christoph Hellwig's message of June 8, 2020 2:19 am:
> Can you do a listing using gdb where this happens?
> 
> gdb vmlinux
> 
> l *(snd_pcm_hw_params+0x3f3)
> 
> ?
> 

(gdb) l *(snd_pcm_hw_params+0x3f3)
0xffffffff817efc85 is in snd_pcm_hw_params (.../linux/sound/core/pcm_native.c:749).
744             while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
745                     runtime->boundary *= 2;
746
747             /* clear the buffer for avoiding possible kernel info leaks */
748             if (runtime->dma_area && !substream->ops->copy_user)
749                     memset(runtime->dma_area, 0, runtime->dma_bytes);
750
751             snd_pcm_timer_resolution_change(substream);
752             snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
753