linux-kernel - Re: Kernel WARNING via bochsdrmfb mmap

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Message-ID: <56DD920A.70400@suse.cz>
Date:	Mon, 7 Mar 2016 15:36:58 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Takashi Iwai <tiwai@...e.de>, dri-devel@...ts.freedesktop.org
Cc:	Gerd Hoffmann <kraxel@...hat.com>,
	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Kernel WARNING via bochsdrmfb mmap

On 03/07/2016, 03:30 PM, Takashi Iwai wrote:
> Hi,
> 
> Jiri Slaby reported a kernel WARNING triggered by syzkaller.  It can
> be reliably reproduced via fbdev mmap access on bochs drm.  The
> warning looks like below:
> 
> WARNING: CPU: 3 PID: 29356 at ../drivers/gpu/drm/ttm/ttm_bo_vm.c:265 ttm_bo_vm_open+0x11a/0x180 [ttm]()

BTW running the reproducer on my box gives:
x86/PAT: ac:501 freeing invalid memtype [mem 0xe083d000-0xe083dfff]

and not the warning.

thanks,
-- 
js
suse labs