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Subject: Re: Kernel WARNING via bochsdrmfb mmap
To: Takashi Iwai <tiwai@suse.de>, dri-devel@lists.freedesktop.org
References: <s5hy49ue4y0.wl-tiwai@suse.de>
Cc: Gerd Hoffmann <kraxel@redhat.com>, Dave Airlie <airlied@redhat.com>,
        linux-kernel@vger.kernel.org
From: Jiri Slaby <jslaby@suse.cz>
Message-ID: <56DD920A.70400@suse.cz>
Date: Mon, 7 Mar 2016 15:36:58 +0100
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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