ttm dma allocator issue ?

[Jerome Glisse]

Hi Konrad i stumble on this after a long period of test :

Dec  9 12:00:37 homer kernel: ------------[ cut here ]------------
Dec  9 12:00:37 homer kernel: WARNING: at lib/dma-debug.c:894
check_unmap+0x262/0x7e0()
Dec  9 12:00:37 homer kernel: Hardware name: GA-A75M-UD2H
Dec  9 12:00:37 homer kernel: radeon 0000:01:00.0: DMA-API: device
driver frees DMA memory with different CPU address [device address=0x00000002093f3000]
                                                   [size=4096 bytes]
                                                   [cpu alloc address=0x0000000213bf2000]
                                                   [cpu free address=0x00000002093f3000]
Dec  9 12:00:37 homer kernel: Modules linked in: radeon ttm
drm_kms_helper drm ip6t_REJECT ipt_REJECT nf_conntrack_ipv6
nf_conntrack_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 xt_state nf_conntrack
ip6table_filter iptable_filter ip6_tables ip_tables dm_mirror
dm_region_hash dm_log dm_mod snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device r8169
snd_pcm microcode serio_raw xhci_hcd mii hwmon i2c_piix4 i2c_algo_bit
snd_timer snd soundcore snd_page_alloc ipv6 ext4 mbcache jbd2
ata_generic pata_atiixp [last unloaded: drm]
Dec  9 12:00:37 homer kernel: Pid: 1158, comm: Heaven_x64 Not tainted 3.2.0-rc4+ #72
Dec  9 12:00:37 homer kernel: Call Trace:
Dec  9 12:00:37 homer kernel: [<ffffffff81043d0f>] warn_slowpath_common+0x7f/0xc0
Dec  9 12:00:37 homer kernel: [<ffffffff81043e06>] warn_slowpath_fmt+0x46/0x50
Dec  9 12:00:37 homer kernel: [<ffffffff81229382>] check_unmap+0x262/0x7e0
Dec  9 12:00:37 homer kernel: [<ffffffff81113977>] ?vm_unmap_aliases+0x77/0x1d0
Dec  9 12:00:37 homer kernel: [<ffffffff8122996d>] debug_dma_free_coherent+0x6d/0x80
Dec  9 12:00:37 homer kernel: [<ffffffff8104bb60>] ?__request_resource+0x60/0x60
Dec  9 12:00:37 homer kernel: [<ffffffffa03e7597>] __ttm_dma_free_page+0x67/0xd0 [ttm]
Dec  9 12:00:37 homer kernel: [<ffffffffa03e7f45>] ttm_dma_unpopulate+0x2c5/0x340 [ttm]
Dec  9 12:00:37 homer kernel: [<ffffffffa042a81f>] radeon_ttm_tt_unpopulate+0xdf/0xf0 [radeon]
Dec  9 12:00:37 homer kernel: [<ffffffffa03df151>] ttm_tt_destroy+0x31/0x70 [ttm]
Dec  9 12:00:37 homer kernel: [<ffffffffa03df703>] ttm_bo_cleanup_memtype_use+0x43/0xb0 [ttm]
Dec  9 12:00:37 homer kernel: [<ffffffffa03e0988>] ttm_bo_release+0x218/0x240 [ttm]
Dec  9 12:00:37 homer kernel: [<ffffffffa03e0770>] ?ttm_bo_delayed_workqueue+0x40/0x40 [ttm]
Dec  9 12:00:37 homer kernel: [<ffffffff8120df96>] kref_put+0x36/0x70
Dec  9 12:00:37 homer kernel: [<ffffffffa03dfa71>] ttm_bo_unref+0x41/0x60 [ttm]
Dec  9 12:00:37 homer kernel: [<ffffffffa042bb29>] radeon_bo_unref+0x49/0x80 [radeon]
Dec  9 12:00:37 homer kernel: [<ffffffffa038e4d0>] ?drm_gem_object_release_handle+0x90/0x90 [drm]
Dec  9 12:00:37 homer kernel: [<ffffffffa043cd16>] radeon_gem_object_free+0x26/0x30 [radeon]
Dec  9 12:00:37 homer kernel: [<ffffffffa038e4fa>] drm_gem_object_free+0x2a/0x30 [drm]
Dec  9 12:00:37 homer kernel: [<ffffffff8120df96>] kref_put+0x36/0x70
Dec  9 12:00:37 homer kernel: [<ffffffffa038e152>] drm_gem_handle_delete+0xc2/0x110 [drm]
Dec  9 12:00:37 homer kernel: [<ffffffffa038e7e8>] drm_gem_close_ioctl+0x28/0x30 [drm]
Dec  9 12:00:37 homer kernel: [<ffffffffa038c5d4>] drm_ioctl+0x444/0x510 [drm]
Dec  9 12:00:37 homer kernel: [<ffffffffa038e7c0>] ?drm_gem_destroy+0x60/0x60 [drm]
Dec  9 12:00:37 homer kernel: [<ffffffff811c4670>] ?inode_has_perm+0x30/0x40
Dec  9 12:00:37 homer kernel: [<ffffffff811c4d6c>] ?file_has_perm+0xdc/0xf0
Dec  9 12:00:37 homer kernel: [<ffffffff81146198>] do_vfs_ioctl+0x98/0x570
Dec  9 12:00:37 homer kernel: [<ffffffff81146701>] sys_ioctl+0x91/0xa0
Dec  9 12:00:37 homer kernel: [<ffffffff814bf42b>] system_call_fastpath+0x16/0x1b
Dec  9 12:00:37 homer kernel: ---[ end trace 8219ad8f7980f419 ]---
Dec  9 12:00:37 homer kernel: Mapped at:
Dec  9 12:00:37 homer kernel: [<ffffffff812282eb>] debug_dma_alloc_coherent+0x3b/0x90
Dec  9 12:00:37 homer kernel: [<ffffffffa03e84a0>] ttm_dma_populate+0x340/0xa30 [ttm]
Dec  9 12:00:37 homer kernel: [<ffffffffa042ae4f>] radeon_ttm_tt_populate+0x19f/0x280 [radeon]
Dec  9 12:00:37 homer kernel: [<ffffffffa03df0ae>] ttm_tt_bind+0x3e/0x70 [ttm]
Dec  9 12:00:37 homer kernel: [<ffffffffa03e0fcf>] ttm_bo_handle_move_mem+0x36f/0x3e0 [ttm]
Dec  9 12:01:29 homer kernel: DMA-API: debugging out of memory - disabling
Dec  9 19:16:54 homer kernel: [drm:radeon_dvi_detect] *ERROR* DVI-I-1:
probed a monitor but no|invalid EDID

Nothing else in the log. Quite frankly i dont this how this can happen.
Any ideas ?

Cheers,
Jerome