linux-kernel - Re: [LKP] [ALSA] 3a6d1980fe: kernel_BUG_at_mm/page

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Date:   Mon, 26 Nov 2018 09:17:32 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     Takashi Sakamoto <o-takashi@...amocchi.jp>,
        LKML <linux-kernel@...r.kernel.org>, alsa-devel@...a-project.org,
        lkp@...org
Subject: Re: [LKP] [ALSA] 3a6d1980fe: kernel_BUG_at_mm/page_alloc.c

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