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Date: Wed, 6 Apr 2011 10:54:07 +0200
From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: linux-kernel@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Thomas Hellstrom <thomas@shipmail.org>
Subject: Re: WARNING: at drivers/gpu/drm/ttm/ttm_page_alloc.c:758
Message-ID: <20110406085407.GA1634@x4.trippels.de>
References: <20110329145651.GA1641@gentoo.trippels.de>
 <20110405163141.GA1651@x4.trippels.de>
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On 2011.04.05 at 18:31 +0200, Markus Trippelsdorf wrote:
> On 2011.03.29 at 16:56 +0200, Markus Trippelsdorf wrote:
> > Just came across this WARNING (running latest git kernel):
> > 
> > Mar 29 09:14:39 gentoo kernel: udev[888]: starting version 164                                                                                       
> > Mar 29 15:45:45 gentoo kernel: ------------[ cut here ]------------                                                                                  
> > Mar 29 15:45:45 gentoo kernel: WARNING: at drivers/gpu/drm/ttm/ttm_page_alloc.c:758 ttm_put_pages+0x1c6/0x2b0()                                      
> > Mar 29 15:45:45 gentoo kernel: Hardware name: System Product Name                                                                                    
> It happened again today.
> 
>  ------------[ cut here ]------------                                                                                      
>  WARNING: at drivers/gpu/drm/ttm/ttm_page_alloc.c:758 ttm_put_pages+0x1c6/0x2c0()                                          
>  Hardware name: System Product Name                                                                                        
>  Pid: 680, comm: kworker/u:6 Not tainted 2.6.39-rc1-00254-gd297f96 #5                                                      
>  Call Trace:                                                                                                               
>  [<ffffffff810736af>] warn_slowpath_common+0x6f/0xa0                                                                       
>  [<ffffffff810737fa>] warn_slowpath_null+0x1a/0x20                                                                         
>  [<ffffffff812c7726>] ttm_put_pages+0x1c6/0x2c0                                                                            
>  [<ffffffff812bff7d>] ttm_tt_free_alloced_pages+0xbd/0x100                                                                 
>  [<ffffffff812c0a5c>] ttm_tt_swapout+0x1bc/0x2c0                                                                           
>  [<ffffffff812c2365>] ttm_bo_swapout+0x1a5/0x240                                                                           
>  [<ffffffff812b5637>] ? drm_mm_kmalloc+0x37/0xe0                                                                           
>  [<ffffffff812bf3b8>] ttm_shrink+0xd8/0x140                                                                                
>  [<ffffffff8108eb01>] ? queue_work+0x21/0x60                                                                               
>  [<ffffffff812bf420>] ? ttm_shrink+0x140/0x140                                                                             
>  [<ffffffff812bf439>] ttm_shrink_work+0x19/0x20                                                                            
>  [<ffffffff8108dade>] process_one_work+0x11e/0x4e0                                                                         
>  [<ffffffff8108e4ce>] worker_thread+0x16e/0x360                                                                            
>  [<ffffffff8108e360>] ? manage_workers.isra.28+0x260/0x260                                                                 
>  [<ffffffff810932ac>] kthread+0x8c/0xa0                                                                                    
>  [<ffffffff8152a394>] kernel_thread_helper+0x4/0x10                                                                        
>  [<ffffffff81093220>] ? kthread_flush_work_fn+0x20/0x20                                                                    
>  [<ffffffff8152a390>] ? gs_change+0xb/0xb                                                                                  
>  ---[ end trace cb7fc1aad109a0a7 ]---                                                                                      
>  ------------[ cut here ]------------

Looks like this is caused by f9820a46dd7888b05a36e81166fb1abcc47dcc3f :

 ttm: Utilize the DMA API for pages that have TTM_PAGE_FLAG_DMA32 set.

CCing the relevant people.

-- 
Markus
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