Oops (NULL pointer dereference) in radeon_fence_ref in 3.14.63
Christian König
christian.koenig at amd.com
Tue Mar 8 08:50:05 UTC 2016
Am 08.03.2016 um 03:54 schrieb Nicolai Hähnle:
> Hi,
>
> On 05.03.2016 16:24, Christian König wrote:
>> just an educated guess, but I think the problem is simply that kernel
>> 3.14 doesn't yet contain the code so that radeon_fence_get() can safely
>> called with a NULL pointer.
>>
>> So the backport of Nicolai's patch needs and extra check for the case
>> when the fence is NULL.
>
> Oops indeed. Only the ref call should need the guard, the unref has
> always had a NULL pointer test as far as I can see.
>
> Lutz, could you please test whether the attached patch on top of
> 3.14.63 fixes the problem?
Patch is Reviewed-by: Christian König <christian.koenig at amd.com>.
Regards,
Christian.
>
> Thanks,
> Nicolai
>
>> Regards,
>> Christian.
>>
>> Am 05.03.2016 um 18:16 schrieb Lutz Euler:
>>> Hi,
>>>
>>> after upgrading from kernel 3.14.62 to 3.14.63, while surfing, the
>>> screen suddenly got black and the mouse cursor froze. I had to reset
>>> the machine and found an oops followed by repeated messages
>>> "BUG: scheduling while atomic: Xorg/3757/0x00000002" in the logs.
>>> I have copied the oops and the first of these messages below.
>>>
>>> This was repeatable: After the reboot, when the browser restored its
>>> tabs, the oops occurred again. I then rebooted into 3.14.62 and the
>>> problem didn't occur again.
>>>
>>> Just guessing: Of the commits regarding radeon between these two
>>> kernel versions might the following be involved
>>>
>>> Nicolai Hähnle (1):
>>> drm/radeon: hold reference to fences in radeon_sa_bo_new
>>>
>>> as it mentions fences and the stack trace starts with radeon_sa_bo_new?
>>>
>>> Thanks and Regards,
>>>
>>> Lutz
>>>
>>> From lspci -v:
>>>
>>> 05:00.0 VGA compatible controller: ATI Technologies Inc NI Caicos [AMD
>>> RADEON HD 6450] (prog-if 00 [VGA controller])
>>> Subsystem: PC Partner Limited Device e164
>>> Flags: bus master, fast devsel, latency 0, IRQ 53
>>> Memory at d0000000 (64-bit, prefetchable) [size=256M]
>>> Memory at fe9e0000 (64-bit, non-prefetchable) [size=128K]
>>> I/O ports at e000 [size=256]
>>> Expansion ROM at fe9c0000 [disabled] [size=128K]
>>> Capabilities: [50] Power Management version 3
>>> Capabilities: [58] Express Legacy Endpoint, MSI 00
>>> Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
>>> Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1
>>> Len=010 <?>
>>> Capabilities: [150] Advanced Error Reporting
>>> Kernel driver in use: radeon
>>> Kernel modules: radeon
>>>
>>> X.Org version: 1.10.4
>>>
>>> decodecode of the oops:
>>>
>>> Mar 5 15:04:58 lutz kernel: [ 6995.216776] Code: c7 c6 d8 3e 36 a0 31
>>> c0 45 31 e4 e8 7b 70 15 e1 eb b5 66 0f 1f 84 00 00 00 00 00 55 48 89
>>> f8 ba 01 00 00 00 48 89 e5 48 83 ec 10 <f0> 0f c1 57 08 ff c2 ff ca 7e
>>> 02 c9 c3 80 3d 10 ae 10 00 01 74
>>> All code
>>> ========
>>> 0: c7 c6 d8 3e 36 a0 mov $0xa0363ed8,%esi
>>> 6: 31 c0 xor %eax,%eax
>>> 8: 45 31 e4 xor %r12d,%r12d
>>> b: e8 7b 70 15 e1 callq 0xffffffffe115708b
>>> 10: eb b5 jmp 0xffffffffffffffc7
>>> 12: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1)
>>> 19: 00 00
>>> 1b: 55 push %rbp
>>> 1c: 48 89 f8 mov %rdi,%rax
>>> 1f: ba 01 00 00 00 mov $0x1,%edx
>>> 24: 48 89 e5 mov %rsp,%rbp
>>> 27: 48 83 ec 10 sub $0x10,%rsp
>>> 2b:* f0 0f c1 57 08 lock xadd %edx,0x8(%rdi)
>>> <-- trapping instruction
>>> 30: ff c2 inc %edx
>>> 32: ff ca dec %edx
>>> 34: 7e 02 jle 0x38
>>> 36: c9 leaveq
>>> 37: c3 retq
>>> 38: 80 3d 10 ae 10 00 01 cmpb $0x1,0x10ae10(%rip) #
>>> 0x10ae4f
>>> 3f: 74 .byte 0x74
>>>
>>> Code starting with the faulting instruction
>>> ===========================================
>>> 0: f0 0f c1 57 08 lock xadd %edx,0x8(%rdi)
>>> 5: ff c2 inc %edx
>>> 7: ff ca dec %edx
>>> 9: 7e 02 jle 0xd
>>> b: c9 leaveq
>>> c: c3 retq
>>> d: 80 3d 10 ae 10 00 01 cmpb $0x1,0x10ae10(%rip) #
>>> 0x10ae24
>>> 14: 74 .byte 0x74
>>>
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192330] BUG: unable to handle
>>> kernel NULL pointer dereference at 0000000000000008
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192375] IP: [<ffffffffa02776c0>]
>>> radeon_fence_ref+0x10/0x50 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192441] PGD 22a86a067 PUD
>>> 22d8e8067 PMD 0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192463] Oops: 0002 [#1] PREEMPT SMP
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192484] Modules linked in:
>>> binfmt_misc parport_pc ppdev snd_hda_codec_hdmi snd_opl3_synth
>>> snd_seq_midi_emul snd_hda_intel snd_hda_codec snd_es1938 gameport
>>> snd_pcm_oss snd_mixer_oss snd_seq_dummy snd_pcm snd_seq_oss
>>> snd_opl3_lib snd_hwdep snd_mpu401_uart snd_seq_midi snd_rawmidi
>>> snd_seq_midi_event snd_seq psmouse fbcon tileblit edac_core font
>>> serio_raw i2c_piix4 bitblit softcursor radeon snd_seq_device snd_timer
>>> hwmon_vid ttm drm_kms_helper asus_atk0110 drm i2c_algo_bit snd
>>> soundcore lp parport usbhid btrfs raid6_pq zlib_deflate xor r8169 mii
>>> xhci_hcd libcrc32c
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192741] CPU: 5 PID: 3757 Comm:
>>> Xorg Not tainted 3.14.63 #1
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192765] Hardware name: System
>>> manufacturer System Product Name/M4A87TD/USB3, BIOS 1202 02/17/2011
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192803] task: ffff88022c1d5f80 ti:
>>> ffff8800c42a6000 task.ti: ffff8800c42a6000
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192833] RIP:
>>> 0010:[<ffffffffa02776c0>] [<ffffffffa02776c0>]
>>> radeon_fence_ref+0x10/0x50 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192881] RSP:
>>> 0018:ffff8800c42a7a68 EFLAGS: 00010282
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192903] RAX: 0000000000000000 RBX:
>>> ffff8800c5d61328 RCX: 0000000000000000
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192931] RDX: 0000000000000001 RSI:
>>> 0000000000000000 RDI: 0000000000000000
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192960] RBP: ffff8800c42a7a78 R08:
>>> ffff8800c5d60000 R09: 0000000000000000
>>> Mar 5 15:04:58 lutz kernel: [ 6995.192988] R10: 0000000000000000 R11:
>>> 0000000000000000 R12: 0000000000000100
>>> Mar 5 15:04:58 lutz kernel: [ 6995.193016] R13: ffff8800c5d613b0 R14:
>>> ffff8800c42a7ae8 R15: ffff8800c42a7b08
>>> Mar 5 15:04:58 lutz kernel: [ 6995.193045] FS:
>>> 00007f7ebe91d8a0(0000) GS:ffff880237d40000(0000) knlGS:0000000000000000
>>> Mar 5 15:04:58 lutz kernel: [ 6995.193076] CS: 0010 DS: 0000 ES:
>>> 0000 CR0: 0000000080050033
>>> Mar 5 15:04:58 lutz kernel: [ 6995.193100] CR2: 0000000000000008 CR3:
>>> 000000022de3e000 CR4: 00000000000007e0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.193128] Stack:
>>> Mar 5 15:04:58 lutz kernel: [ 6995.193137] ffff880159dcef00
>>> ffff8800c5d61328 ffff8800c42a7b88 ffffffffa02d9f22
>>> Mar 5 15:04:58 lutz kernel: [ 6995.193170] 01ff8800c42a7a98
>>> ffff8800c5d60000 ffff8800c42a7b08 ffff8800c42a7c88
>>> Mar 5 15:04:58 lutz kernel: [ 6995.193203] 0000f00455ee5200
>>> ffff8800c5d613b0 00000100c42a7b08 0006e97800200000
>>> Mar 5 15:04:58 lutz kernel: [ 6995.193237] Call Trace:
>>> Mar 5 15:04:58 lutz kernel: [ 6995.194709] [<ffffffffa02d9f22>]
>>> radeon_sa_bo_new+0x302/0x590 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.196175] [<ffffffff811551e6>] ?
>>> __kmalloc+0x66/0x1d0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.197659] [<ffffffffa028f849>] ?
>>> copy_from_user+0x9/0x10 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.199160] [<ffffffffa028dcb3>]
>>> radeon_ib_get+0x43/0xe0 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.200655] [<ffffffffa0290111>]
>>> radeon_cs_ioctl+0x201/0xac0 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.202135] [<ffffffff812ffe52>] ?
>>> idr_mark_full+0x52/0x70
>>> Mar 5 15:04:58 lutz kernel: [ 6995.203620] [<ffffffffa01b6b31>]
>>> drm_ioctl+0x401/0x580 [drm]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.205094] [<ffffffffa028ff10>] ?
>>> radeon_cs_parser_init+0x470/0x470 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.206564] [<ffffffff816572dc>] ?
>>> __do_page_fault+0x1cc/0x560
>>> Mar 5 15:04:58 lutz kernel: [ 6995.208033] [<ffffffffa025e349>]
>>> radeon_drm_ioctl+0x9/0x10 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.209510] [<ffffffff8116fe21>]
>>> do_vfs_ioctl+0x81/0x4d0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.210975] [<ffffffff81137f29>] ?
>>> SyS_mmap_pgoff+0xd9/0x210
>>> Mar 5 15:04:58 lutz kernel: [ 6995.212432] [<ffffffff81170301>]
>>> SyS_ioctl+0x91/0xa0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.213874] [<ffffffff8165767c>] ?
>>> do_page_fault+0xc/0x10
>>> Mar 5 15:04:58 lutz kernel: [ 6995.215323] [<ffffffff8165b542>]
>>> system_call_fastpath+0x16/0x1b
>>> Mar 5 15:04:58 lutz kernel: [ 6995.216776] Code: c7 c6 d8 3e 36 a0 31
>>> c0 45 31 e4 e8 7b 70 15 e1 eb b5 66 0f 1f 84 00 00 00 00 00 55 48 89
>>> f8 ba 01 00 00 00 48 89 e5 48 83 ec 10 <f0> 0f c1 57 08 ff c2 ff ca 7e
>>> 02 c9 c3 80 3d 10 ae 10 00 01 74
>>> Mar 5 15:04:58 lutz kernel: [ 6995.218402] RIP [<ffffffffa02776c0>]
>>> radeon_fence_ref+0x10/0x50 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.219987] RSP <ffff8800c42a7a68>
>>> Mar 5 15:04:58 lutz kernel: [ 6995.221568] CR2: 0000000000000008
>>> Mar 5 15:04:58 lutz kernel: [ 6995.234168] ---[ end trace
>>> 37c0545f39a2b3e5 ]---
>>>
>>> Mar 5 15:04:58 lutz kernel: [ 6995.234170] note: Xorg[3757] exited
>>> with preempt_count 1
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239926] BUG: scheduling while
>>> atomic: Xorg/3757/0x00000002
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239931] Modules linked in:
>>> binfmt_misc parport_pc ppdev snd_hda_codec_hdmi snd_opl3_synth
>>> snd_seq_midi_emul snd_hda_intel snd_hda_c
>>> odec snd_es1938 gameport snd_pcm_oss snd_mixer_oss snd_seq_dummy
>>> snd_pcm snd_seq_oss snd_opl3_lib snd_hwdep snd_mpu401_uart
>>> snd_seq_midi snd_rawmidi snd_seq_midi_event
>>> snd_seq psmouse fbcon tileblit edac_core font serio_raw i2c_piix4
>>> bitblit softcursor radeon snd_seq_device snd_timer hwmon_vid ttm
>>> drm_kms_helper asus_atk0110 drm i2c
>>> _algo_bit snd soundcore lp parport usbhid btrfs raid6_pq zlib_deflate
>>> xor r8169 mii xhci_hcd libcrc32c
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239960] CPU: 5 PID: 3757 Comm:
>>> Xorg Tainted: G D 3.14.63 #1
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239961] Hardware name: System
>>> manufacturer System Product Name/M4A87TD/USB3, BIOS 1202 02/17/2011
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239963] 0000000000000000
>>> ffff8800c42a7078 ffffffff8164f89c ffff880237d518c0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239965] 0000000000000005
>>> ffff8800c42a7088 ffffffff81075d27 ffff8800c42a70f8
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239967] ffffffff81650680
>>> ffff8800c42a7184 ffff88022c1d5f80 ffff8800c42a6000
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239969] Call Trace:
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239976] [<ffffffff8164f89c>]
>>> dump_stack+0x4f/0x6b
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239980] [<ffffffff81075d27>]
>>> __schedule_bug+0x47/0x60
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239982] [<ffffffff81650680>]
>>> __schedule+0x600/0x810
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239984] [<ffffffff81650984>]
>>> schedule+0x24/0x70
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239986] [<ffffffff8164fa11>]
>>> schedule_timeout+0x151/0x320
>>> Mar 5 15:04:58 lutz kernel: [ 6995.239989] [<ffffffff81056b60>] ?
>>> call_timer_fn+0x1a0/0x1a0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240028] [<ffffffffa027713a>]
>>> radeon_fence_wait_seq+0x3ca/0x530 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240043] [<ffffffffa02c1740>] ?
>>> evergreen_program_watermarks+0x150/0x670 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240046] [<ffffffff8108a210>] ?
>>> bit_waitqueue+0xd0/0xd0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240062] [<ffffffffa02c004b>] ?
>>> evergreen_line_buffer_adjust.clone.5+0xcb/0x1a0 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240073] [<ffffffffa0277680>]
>>> radeon_fence_wait_empty_locked+0xb0/0xe0 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240088] [<ffffffffa02bb83d>]
>>> radeon_pm_compute_clocks+0x59d/0x840 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240100] [<ffffffffa026a69f>]
>>> atombios_crtc_dpms+0x6f/0x100 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240111] [<ffffffffa026bc08>]
>>> atombios_crtc_disable+0x28/0x2f0 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240126] [<ffffffffa02d8844>] ?
>>> radeon_atom_encoder_dpms+0xf4/0x230 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240132] [<ffffffffa021b305>]
>>> drm_helper_disable_unused_functions+0x105/0x160 [drm_kms_helper]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240135] [<ffffffffa021c610>]
>>> drm_crtc_helper_set_config+0x130/0x970 [drm_kms_helper]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240138] [<ffffffff81155962>] ?
>>> __slab_free+0x302/0x480
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240151] [<ffffffffa0285061>]
>>> radeon_crtc_set_config+0x31/0xb0 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240172] [<ffffffffa01c16ac>]
>>> drm_mode_set_config_internal+0x5c/0xe0 [drm]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240180] [<ffffffffa01c30bd>]
>>> drm_framebuffer_remove+0x10d/0x160 [drm]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240188] [<ffffffffa01c6605>]
>>> drm_fb_release+0xa5/0xd0 [drm]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240195] [<ffffffffa01b7e18>]
>>> drm_release+0x548/0x5c0 [drm]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240198] [<ffffffff8115f5a4>]
>>> __fput+0xa4/0x220
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240199] [<ffffffff8115f769>]
>>> ____fput+0x9/0x10
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240202] [<ffffffff8106a80c>]
>>> task_work_run+0xac/0xd0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240205] [<ffffffff8104dc30>]
>>> do_exit+0x2c0/0xac0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240207] [<ffffffff8164f77b>] ?
>>> printk+0x48/0x4a
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240209] [<ffffffff8109bc29>] ?
>>> kmsg_dump+0xb9/0xd0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240211] [<ffffffff8165553a>]
>>> oops_end+0x9a/0xe0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240214] [<ffffffff8103ee32>]
>>> no_context+0x132/0x2e0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240216] [<ffffffff8103f0f5>]
>>> __bad_area_nosemaphore+0x115/0x210
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240218] [<ffffffff811136d1>] ?
>>> __alloc_pages_nodemask+0x141/0x910
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240220] [<ffffffff8103f1fe>]
>>> bad_area_nosemaphore+0xe/0x10
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240222] [<ffffffff81657442>]
>>> __do_page_fault+0x332/0x560
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240230] [<ffffffffa022b8bb>] ?
>>> ttm_mem_global_alloc_zone.clone.1+0x12b/0x150 [ttm]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240233] [<ffffffffa022bc12>] ?
>>> ttm_mem_global_alloc_page+0x42/0x50 [ttm]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240237] [<ffffffff8114dd3e>] ?
>>> alloc_pages_current+0xae/0x170
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240238] [<ffffffff8165767c>]
>>> do_page_fault+0xc/0x10
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240240] [<ffffffff816549d2>]
>>> page_fault+0x22/0x30
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240252] [<ffffffffa02776c0>] ?
>>> radeon_fence_ref+0x10/0x50 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240268] [<ffffffffa02d9f22>]
>>> radeon_sa_bo_new+0x302/0x590 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240270] [<ffffffff811551e6>] ?
>>> __kmalloc+0x66/0x1d0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240283] [<ffffffffa028f849>] ?
>>> copy_from_user+0x9/0x10 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240296] [<ffffffffa028dcb3>]
>>> radeon_ib_get+0x43/0xe0 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240309] [<ffffffffa0290111>]
>>> radeon_cs_ioctl+0x201/0xac0 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240312] [<ffffffff812ffe52>] ?
>>> idr_mark_full+0x52/0x70
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240320] [<ffffffffa01b6b31>]
>>> drm_ioctl+0x401/0x580 [drm]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240333] [<ffffffffa028ff10>] ?
>>> radeon_cs_parser_init+0x470/0x470 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240335] [<ffffffff816572dc>] ?
>>> __do_page_fault+0x1cc/0x560
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240346] [<ffffffffa025e349>]
>>> radeon_drm_ioctl+0x9/0x10 [radeon]
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240348] [<ffffffff8116fe21>]
>>> do_vfs_ioctl+0x81/0x4d0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240351] [<ffffffff81137f29>] ?
>>> SyS_mmap_pgoff+0xd9/0x210
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240353] [<ffffffff81170301>]
>>> SyS_ioctl+0x91/0xa0
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240355] [<ffffffff8165767c>] ?
>>> do_page_fault+0xc/0x10
>>> Mar 5 15:04:58 lutz kernel: [ 6995.240357] [<ffffffff8165b542>]
>>> system_call_fastpath+0x16/0x1b
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>>
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