Cubietruck, hangs graphics subsystem

[impatt]

Hello everyone.
Another difficulty with Cubietruck: spontaneously die graphics subsystem. dmesg contains references to memory access errors. Maybe someone knows what it is and how to fix it?
Thank you.

Errors from dmesg below:
$this->bbcode_second_pass_code('', '[43673.580793] Unable to handle kernel paging request at virtual address 008beac0
[43673.582557] pgd = ec778000
[43673.584914] [008beac0] *pgd=6962d831, *pte=a6d4a75d, *ppte=00000000
[43673.592163] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
[43673.599398] Modules linked in: dm_crypt dm_mod sunxi_gmac disp_ump sunxi_cedar_mod mali ump sysimgblt sysfillrect syscopyarea fb_sys_fops
[43673.625103] CPU: 1 Not tainted (3.4.103-5-ARCH #2)
[43673.633611] PC is at DE_BE_HWC_Set_Src+0xbc/0x158
[43673.637879] LR is at BSP_disp_hwc_set_framebuffer+0x10/0x20
[43673.646739] pc : [<c0222ef0>] lr : [<c022ad88>] psr: 40050013
[43673.646745] sp : ec7f9e24 ip : 008beac0 fp : 00000109
[43673.655341] r10: 000000c4 r9 : 00000000 r8 : ecd4d2c0
[43673.666099] r7 : beceb9e8 r6 : 00000001 r5 : 00000001 r4 : 00000001
[43673.677550] r3 : 00000000 r2 : c06bd3c8 r1 : ec7f9e60 r0 : 00000000
[43673.688568] Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[43673.698207] Control: 10c5387d Table: 6c77806a DAC: 00000015

[43673.706368] PC: 0xc0222e70:
[43673.720417] 2e70 e591c004 e7d3c00c e6ef707c f57ff04f e591c004 e28cc001 e7dcc003 e6efc07c
[43673.742968] 2e90 f57ff04f e591e004 e28ee002 e7dee003 e6efe07e f57ff04f e1a0e80e e18ec40c
[43673.760404] 2eb0 e591e004 e18cc007 e28ee003 e7dee003 e6efe07e f57ff04f e18ccc0e f57ff04f
[43673.775501] 2ed0 e792e100 e28eeb12 e78ec003 e2833004 e3530b01 1affffe1 ea000009 e591c004
[43673.790599] 2ef0 e793e00c f57ff04f f57ff04f e792c100 e28ccb12 e78ce003 e2833004 e3530b01
[43673.805870] 2f10 1afffff5 e7923100 e59338e0 f57ff04f f57ff04f e7921100 e1a04204 e1844106
[43673.820976] 2f30 e3c3303c e1844003 e58148e0 e7923100 e59338e0 f57ff04f f57ff04f e7921100
[43673.835899] 2f50 e3c33003 e1853003 e58138e0 e7923100 e59338d8 f57ff04f f57ff04f e7922100

[43673.852386] LR: 0xc022ad08:
[43673.854305] ad08 e5832048 e590200c e5832038 e5902010 e583203c e5902014 e583204c e5902018
[43673.872000] ad28 e5832050 e590201c e5832054 e5902020 e3a00000 e5832058 e12fff1e c06bd470
[43673.887270] ad48 e92d4008 ebffe003 e3a00000 e8bd8008 e92d4008 ebffe00b e3a00000 e8bd8008
[43673.902195] ad68 e92d4008 ebffe013 e3a00000 e8bd8008 e3510000 0a000003 e92d4008 ebffe02a
[43673.917292] ad88 e3a00000 e8bd8008 e3e00001 e12fff1e e3510000 e92d4008 0a000002 e082c003
[43673.932562] ada8 e35c0b01 9a000003 e59f0014 eb085a70 e3e00001 e8bd8008 ebffe009 e3a00000
[43673.947487] adc8 e8bd8008 c05812e1 e92d4030 e24dd02c e1a05000 e1a04001 e1a0000d e3a01028
[43673.962757] ade8 ebff0c84 e1a0100d e1a00005 ebffe1b8 e1a00005 e3a01000 ebffe218 e1a01004

[43673.978899] SP: 0xec7f9da4:
[43673.979518] 9da4 00100100 00000040 00001000 e9369880 000000db ec7f9d58 ec7f9f7c c00d5014
[43673.998687] 9dc4 c0222ef0 40050013 ffffffff ec7f9e0c c000d458 00000000 ec7f9e60 c06bd3c8
[43674.013783] 9de4 00000000 00000001 00000001 00000001 beceb9e8 ecd4d2c0 00000000 000000c4
[43674.029052] 9e04 00000109 008beac0 ec7f9e24 c022ad88 c0222ef0 40050013 ffffffff ec7f8000
[43674.044149] 9e24 c06b9114 00000000 ec7f8000 beceb9e8 c022ad88 00000000 c02198d8 ec7f9e90
[43674.059245] 9e44 ec7f9e80 beceb98c ec7f9e80 00000000 beceb9e8 00000000 00000109 00000001
[43674.074340] 9e64 008beac0 beceb98c ec7f9e80 e9369880 c035acc8 00000000 beceb9a8 00df7d38
[43674.089437] 9e84 00000fe0 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[43674.105748] R1: 0xec7f9de0:
[43674.110440] 9de0 c06bd3c8 00000000 00000001 00000001 00000001 beceb9e8 ecd4d2c0 00000000
[43674.125536] 9e00 000000c4 00000109 008beac0 ec7f9e24 c022ad88 c0222ef0 40050013 ffffffff
[43674.140460] 9e20 ec7f8000 c06b9114 00000000 ec7f8000 beceb9e8 c022ad88 00000000 c02198d8
[43674.155729] 9e40 ec7f9e90 ec7f9e80 beceb98c ec7f9e80 00000000 beceb9e8 00000000 00000109
[43674.170825] 9e60 00000001 008beac0 beceb98c ec7f9e80 e9369880 c035acc8 00000000 beceb9a8
[43674.185758] 9e80 00df7d38 00000fe0 00000000 00000000 00000000 00000000 00000000 00000000
[43674.201025] 9ea0 00000000 00000000 ece162d0 d4216684 8b9da7ac 000027b8 d4216640 c01f66b8
[43674.216124] 9ec0 00000038 ece162d0 d4216678 00000001 00000038 c004c268 00000038 d4216678

[43674.232437] R2: 0xc06bd348:
[43674.237129] d348 ff0b0b0b ff0c0c0c ff0d0d0d ff0e0e0e ff0f0f0f 00000000 00000000 00000000
[43674.251273] d368 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[43674.267320] d388 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[43674.282413] d3a8 00000000 00000000 00000000 d1001000 00000000 bf049000 d420b2dd 00000000
[43674.297508] d3c8 f1e60000 f1e40000 f1e00000 f1e20000 00000000 00000000 00000000 00000000
[43674.312429] d3e8 00000000 00000000 00000000 00000000 f1c0c000 f1c0d000 f1c0a000 f1c1b000
[43674.327698] d408 c0680cec c06806e8 c0681084 33171177 c0680d00 c06806fc c0681098 c0680d14
[43674.342621] d428 c068105c c0680710 c0680d28 c0681070 c0680724 c0680c74 c068074c c06807b0

[43674.358936] R8: 0xecd4d240:
[43674.359555] d240 00000000 00000000 ecd4d248 ecd4d248 00000000 00000000 00000014 00003b1c
[43674.378906] d260 c06448ec 00000000 00200200 00000000 00000000 00000000 00000000 00000000
[43674.393999] d280 ecd4db00 00000000 ecd4d288 ecd4d288 00000000 00000000 00000014 00000000
[43674.409098] d2a0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[43674.424192] d2c0 00010000 00000065 00000000 00000000 00000000 00000000 00000000 00000000
[43674.439286] d2e0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[43674.454380] d300 ecd4d680 00000000 ecd4d308 ecd4d308 00000000 00000000 00000014 00000000
[43674.469302] d320 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[43674.488816] Process Xorg (pid: 251, stack limit = 0xec7f82f8)
[43674.497846] Stack: (0xec7f9e24 to 0xec7fa000)
[43674.509302] 9e20: c06b9114 00000000 ec7f8000 beceb9e8 c022ad88 00000000 c02198d8
[43674.516433] 9e40: ec7f9e90 ec7f9e80 beceb98c ec7f9e80 00000000 beceb9e8 00000000 00000109
[43674.531710] 9e60: 00000001 008beac0 beceb98c ec7f9e80 e9369880 c035acc8 00000000 beceb9a8
[43674.546976] 9e80: 00df7d38 00000fe0 00000000 00000000 00000000 00000000 00000000 00000000
[43674.562251] 9ea0: 00000000 00000000 ece162d0 d4216684 8b9da7ac 000027b8 d4216640 c01f66b8
[43674.577515] 9ec0: 00000038 ece162d0 d4216678 00000001 00000038 c004c268 00000038 d4216678
[43674.592789] 9ee0: ece162d0 c004cc7c 00000000 beceb9f0 ef13cce8 ec75ccc0 00000009 c000da44
[43674.608054] 9f00: ec7f8000 00000000 008beac0 c00d3d4c 00002000 c00d4740 00000000 ecf1d200
[43674.631473] 9f20: ece162d0 00000000 ec7f8000 00000000 001df000 c004cdfc 00000000 beceb98c
[43674.638604] 9f40: e3491840 beceb9a8 e9369880 beceb98c 00000000 00000129 c000da44 ec7f8000
[43674.653879] 9f60: ec75ccc0 beceb9f0 ec75ccc0 000000c4 00000009 c000da44 ec7f8000 00000000
[43674.669144] 9f80: 008beac0 c00d4864 00000009 00000001 beceb9f0 00208408 002103a8 00000008
[43674.684418] 9fa0: 00000036 c000d8c0 00208408 002103a8 00000009 000000c4 beceb9f0 00000001
[43674.699682] 9fc0: 00208408 002103a8 00000008 00000036 0000005e 00000000 00209388 008beac0
[43674.723104] 9fe0: b65f20b8 beceb9e4 b65dcedc b6b4926c 60050010 00000009 aaaaaaaa aaaaaaaa
[43674.732160] [<c0222ef0>] (DE_BE_HWC_Set_Src+0xbc/0x158) from [<c022ad88>] (BSP_disp_hwc_set_framebuffer+0x10/0x20)
[43674.748995] [<c022ad88>] (BSP_disp_hwc_set_framebuffer+0x10/0x20) from [<c02198d8>] (disp_ioctl+0x1620/0x2180)
[43674.766340] [<c02198d8>] (disp_ioctl+0x1620/0x2180) from [<c00d3d4c>] (vfs_ioctl+0x28/0x3c)
[43674.773390] [<c00d3d4c>] (vfs_ioctl+0x28/0x3c) from [<c00d4740>] (do_vfs_ioctl+0x474/0x564)
[43674.790400] [<c00d4740>] (do_vfs_ioctl+0x474/0x564) from [<c00d4864>] (sys_ioctl+0x34/0x58)
[43674.805838] [<c00d4864>] (sys_ioctl+0x34/0x58) from [<c000d8c0>] (ret_fast_syscall+0x0/0x30)
[43674.819197] Code: e3530b01 1affffe1 ea000009 e591c004 (e793e00c)
[43674.837270] ---[ end trace de1064d4055e3dcb ]---
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