Re: [LKP] [ALSA] 3a6d1980fe: kernel_BUG_at_mm/page_alloc.c

[Takashi Iwai]

On Mon, 26 Nov 2018 01:28:05 +0100,
kernel test robot wrote:
> 
> FYI, we noticed the following commit (built with gcc-7):
> 
> commit: 3a6d1980fe96dbbfe3ae58db0048867f5319cdbf ("ALSA: Replace snd_malloc_pages() and snd_free_pages() with standard helpers")
> https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git for-next
....
> [  174.830284] kernel BUG at mm/page_alloc.c:2850!

OK, this seem to be an issue about using __GFP_COMP and
alloc_pages_exact().  I didn't hit this while testing locally maybe
just because I used the buffer size in power-of-two casually.

I dropped the patch until we sort this out.


thanks,

Takashi