On 2011.04.12 at 21:09 +0200, Stefan Richter wrote:

Hi,

I just switched from 2.6.38-rc7 to 2.6.39-rc3 and got this at some point during userland startup:

WARNING: at lib/dma-debug.c:803 check_unmap+0x19a/0x696() Hardware name: System Product Name NULL NULL: DMA-API: device driver tries to free DMA memory it has not allocated [device address=0x00000000ce47b000] [size=4096 bytes] Modules linked in: cpufreq_ondemand powernow_k8 freq_table mperf snd_pcm_oss snd_mixer_oss snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device nfsd lockd it87 hwmon_vid sunrpc ext4 jbd2 crc16 sr_mod cdrom snd_hda_codec_realtek k10temp yenta_socket snd_hda_intel pcmcia_core pcmcia_rsrc snd_hda_codec snd_pcm pata_atiixp snd_timer sg snd snd_page_alloc r8169 mii processor usb_storage Pid: 4397, comm: X Tainted: G W 2.6.39-rc3 #2 Call Trace: [<ffffffff81031ef9>] warn_slowpath_common+0x80/0x98 [<ffffffff81031fa5>] warn_slowpath_fmt+0x41/0x43 [<ffffffff8134606d>] ? _raw_spin_lock_irqsave+0x49/0x53 [<ffffffff811474e5>] ? check_unmap+0x102/0x696 [<ffffffff8114757d>] check_unmap+0x19a/0x696 [<ffffffff81021810>] ? __change_page_attr_set_clr+0x16d/0x99d [<ffffffff81147ae5>] debug_dma_free_coherent+0x6c/0x7a [<ffffffff811ccb00>] ttm_put_pages+0x117/0x255 [<ffffffff811c62cb>] ttm_tt_free_alloced_pages+0xbc/0xe2 [<ffffffff811c6695>] ttm_tt_destroy+0x50/0xda [<ffffffff811c6f27>] ttm_bo_cleanup_memtype_use+0x29/0x63 [<ffffffff811c96aa>] ttm_bo_release+0x112/0x1df [<ffffffff811c9598>] ? ttm_bo_create+0xff/0xff [<ffffffff81139882>] kref_put+0x43/0x4d [<ffffffff811c7748>] ttm_bo_unref+0x33/0x40 [<ffffffff811f6f66>] radeon_bo_unref+0x3f/0x5e [<ffffffff811b58f2>] ? drm_gem_handle_delete+0x89/0xab [<ffffffff811b5779>] ? drm_gem_object_release_handle+0x5a/0x5a [<ffffffff8120985a>] radeon_gem_object_free+0x1e/0x20 [<ffffffff811b57a1>] drm_gem_object_free+0x28/0x2a [<ffffffff81139882>] kref_put+0x43/0x4d [<ffffffff811b5901>] drm_gem_handle_delete+0x98/0xab [<ffffffff811b5937>] drm_gem_close_ioctl+0x23/0x25 [<ffffffff811b4106>] drm_ioctl+0x277/0x343 [<ffffffff811b5914>] ? drm_gem_handle_delete+0xab/0xab [<ffffffff8102b65f>] ? get_parent_ip+0x11/0x41 [<ffffffff81058895>] ? trace_hardirqs_on+0xd/0xf [<ffffffff810b5e8b>] do_vfs_ioctl+0x464/0x4b3 [<ffffffff810953bd>] ? remove_vma+0x69/0x71 [<ffffffff810b5f1c>] sys_ioctl+0x42/0x65 [<ffffffff813472bb>] system_call_fastpath+0x16/0x1b ---[ end trace 6a2f7052e2c76f52 ]--- DMA-API: debugging out of memory - disabling

This is an AMD RS780/ ATI Radeon HD 3200 system with Gentoo xorg-server 1.9.4 and xf86-video-ati 6.14.1.

Looks similar to: http://thread.gmane.org/gmane.linux.kernel/1119774

Try reverting 69a07f0b117a40fcc1a479358d8e1f41793617f2