日前在CVBS的输出中遇到如下问题，特记录

正常情况下，未插入CVBS线，系统正常启动运行，可是一旦将线插入CVBS插口，系统立即重新启动并且内核打印如下：

[    3.500213] iptables used greatest stack depth: 5232 bytes left
[    3.637085] android_usb: already disabled
[    3.641890] init: starting 'adbd'
[    6.398347] init: starting 'bootanim'
[   26.995598] Unable to handle kernel paging request at virtual address 7f000400
[   27.002907] pgd = e7204000
[   27.005613] [7f000400] *pgd=00000000
[   27.009205] Internal error: Oops: 805 [#1] PREEMPT
[   27.012854] Modules linked in: rtl8150 mcs7830 qf9700 asix tvd gc0308 videobuf_dma_contig videobuf_core cedarx mali ump nand
[   27.012854] CPU: 0    Not tainted  (3.0.8 #247)
[   27.012854] PC is at cpu_v7_set_pte_ext+0x0/0x50
[   27.012854] LR is at __kmap_atomic+0xdc/0x11c
[   27.012854] pc : [<c0040f44>]    lr : [<c00405f0>]    psr: 20000013
[   27.012854] sp : e71f7d38  ip : 00000020  fp : 00000fb0
[   27.012854] r10: e71dc700  r9 : 00000000  r8 : 00000000
[   27.012854] r7 : 00000fb0  r6 : 00000050  r5 : c17a8e00  r4 : fff00000
[   27.012854] r3 : 0000024f  r2 : 00000000  r1 : 76f7024f  r0 : 7f000400
[   27.012854] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[   27.012854] Control: 10c5387d  Table: 67204019  DAC: 00000015
[   27.012854]
[   27.012854] PC: 0xc0040ec4:
[   27.012854] 0ec4  ee110f10 e3c00a01 e3c00006 ee010f10 e1a0f00e e320f000 e320f000 e1a0f000
[   27.012854] 0ee4  f57ff04f e320f003 e1a0f00e ee103f30 e1a03823 e203300f e3a02004 e1a02312
[   27.012854] 0f04  ee070f3a e0800002 e0511002 8afffffb f57ff04f e1a0f00e e3a02000 e5911150
[   27.012854] 0f24  e3800059 ee0d2f30 f57ff06f ee020f10 f57ff06f ee0d1f30 f57ff06f e1a0f00e
[   27.012854] 0f44  e5801000 e3c13e3f e3c33003 e1833002 e3833012 e3110010 13833040 e2211040
[   27.012854] 0f64  e31100c0 13833c02 e3110c01 13833020 e3110c02 13833001 e3110002 13110001
[   27.012854] 0f84  03a03000 e5a03800 ee070f3a e1a0f00e 764d5241 72502037 7365636f 00726f73
[   27.012854] 0fa4  e92d4ff0 ee1d4f10 ee1d5f30 ee1d6f70 e8a00070 ee136f10 ee127f10 ee128f30
[   27.012854]
[   27.012854] LR: 0xc0040570:
[   27.012854] 0570  e3a00001 eb005753 e1a0200d e3c23d7f e3c3303f e5933000 e3130002 0a000000
[   27.012854] 0590  eb1373a0 eb087376 e59f3084 e59f1084 e5933000 e5911000 e0611005 e1a012c1
[   27.012854] 05b0  e2811701 e0844200 e5930000 e59f3068 e1a04604 e3c00eff e2444601 e3c0000f
[   27.012854] 05d0  e5933000 e7e82654 e2800102 e3833c02 e0800102 e1831601 e3a02000 eb000254
[   27.012854] 05f0  f57ff04f ee084f37 e3a03000 ee073fd5 f57ff04f f57ff06f e1a00004 e8bd8070
[   27.012854] 0610  e1a00005 e8bd4070 ea01d799 c07b7b90 c0780ff0 c07c2648 c0857944 c07c2644
[   27.012854] 0630  e92d4010 e1a0100d e3c13d7f e3c3303f e5933004 e3c334fe e3c330ff e3530000
[   27.012854] 0650  0a000002 e59f0030 e3a01020 ebffe0f0 e5903000 e3a01e2e e59f2020 e1a03f23
[   27.012854]
[   27.012854] SP: 0xe71f7cb8:
[   27.012854] 7cb8  e74a1000 e75a5200 0000004c e74a1000 c17a8e00 e74c4730 00000004 e71f7d94
[   27.012854] 7cd8  0000040f 00000005 00000050 00000fb0 00000000 c0034a50 7f000400 76f7024f
[   27.012854] 7cf8  00000000 0000024f fff00000 c17a8e00 00000050 00000fb0 00000000 00000000
[   27.012854] 7d18  e71dc700 00000fb0 00000020 e71f7d38 c00405f0 c0040f44 20000013 ffffffff
[   27.012854] 7d38  e71f7d80 e74c47e4 00000050 c009ff8c 00000050 00000050 e74c47e4 00000000
[   27.012854] 7d58  c052e608 c00a00f4 00000050 00000000 e71f7d94 e71f7d90 0004cfb0 00000000
[   27.012854] 7d78  00000050 00000000 e71f7f40 00000001 00000000 00000054 00000000 c17a8e00
[   27.012854] 7d98  4b3d3f4c e71dc700 00000054 00000000 e74c4730 0004cfb0 00000000 00000000
[   27.012854]
[   27.012854] R4: 0xffefff80:
[   27.012854] ff80  ******** ******** ******** ******** ******** ******** ******** ********
[   27.012854] ffa0  ******** ******** ******** ******** ******** ******** ******** ********
[   27.012854] ffc0  ******** ******** ******** ******** ******** ******** ******** ********
[   27.012854] ffe0  ******** ******** ******** ******** ******** ******** ******** ********
[   27.012854] 0000  00000000 00000000 00000000 00000000 00000000 00000000 ffffffff ffffffff
[   27.012854] 0020  ffffffff 00000043 40bf4150 00000000 00000000 00000062 00000000 00000000
[   27.012854] 0040  00000000 00000000 00000000 00000000 00000000 00000000 ffffffff ffffffff
[   27.012854] 0060  ffffffff 00000043 40bf4150 00000000 00000000 00000062 00000000 00000000
[   27.012854]
[   27.012854] R5: 0xc17a8d80:
[   27.012854] 8d80  40020228 00000001 ffffffff 00000000 e75bc5ac 00000050 c17a8d78 c17a8db8
[   27.012854] 8da0  40020228 00000002 00000000 00000000 e75bc5ac 00000051 c17a8d98 c17a8dd8
[   27.012854] 8dc0  40020228 00000002 00000000 00000000 e75bc5ac 00000052 c17a8db8 c17a8df8
[   27.012854] 8de0  40020228 00000001 ffffffff 00000000 e75bc5ac 00000053 c17a8dd8 c17a8f58
[   27.012854] 8e00  4000087d 00000003 ffffffff e75a5200 e74c47e4 0000004c c17b48b8 c179bdb8
[   27.012854] 8e20  40080068 00000001 00000000 00000000 e6e15c81 000005e3 c17a8e58 c17a9318
[   27.012854] 8e40  40080068 00000001 00000000 00000000 e6e15c81 000005e2 c17a8e78 c17a8e38
[   27.012854] 8e60  40080068 00000001 00000000 00000000 e6e150a1 00000127 c17a8e98 c17a8e58
[   27.012854]
[   27.012854] R10: 0xe71dc680:
[   27.012854] c680  e71dc680 e71dc680 e781b780 e74d2580 c05c9400 00000002 00000002 00000003
[   27.012854] c6a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 e7121c00
[   27.012854] c6c0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   27.012854] c6e0  00000000 00000000 e74bb600 e71dc6ec e71dc6ec e74bb6d4 00000000 00000000
[   27.012854] c700  e707c470 e71e2580 e701b540 e74c7000 c052e3d4 00000001 00020401 0000001e
[   27.012854] c720  0004cfb0 00000000 00000000 00000000 00000000 00000000 00000000 e7090180
[   27.012854] c740  00000000 00000000 00000000 00000020 00000000 00000000 ffffffff ffffffff
[   27.012854] c760  00000000 00000000 00000000 e71dc76c e71dc76c e74c47e4 00000000 00000000
[   27.012854] Process logcat (pid: 94, stack limit = 0xe71f62e8)
[   27.012854] Stack: (0xe71f7d38 to 0xe71f8000)
[   27.012854] 7d20:                                                       e71f7d80 e74c47e4
[   27.012854] 7d40: 00000050 c009ff8c 00000050 00000050 e74c47e4 00000000 c052e608 c00a00f4
[   27.012854] 7d60: 00000050 00000000 e71f7d94 e71f7d90 0004cfb0 00000000 00000050 00000000
[   27.012854] 7d80: e71f7f40 00000001 00000000 00000054 00000000 c17a8e00 4b3d3f4c e71dc700
[   27.012854] 7da0: 00000054 00000000 e74c4730 0004cfb0 00000000 00000000 ffffffff c00a1d44
[   27.012854] 7dc0: 0004cfb0 00000000 e71f7f00 00000054 00000000 0000000a e71f6000 e71f7ec8
[   27.012854] 7de0: e71f7f40 e71f7f00 e74c47e4 00000001 1000000a 00000001 000005a0 0000000a
[   27.012854] 7e00: 491c5b0e 00000054 e71f7e08 0004cfb0 00000000 e71dc700 e74c474c e71f7ec8
[   27.012854] 7e20: e71f7f40 00000001 00000000 c00a1dfc 00000000 c00e26bc 91827364 e71f7e3c
[   27.012854] 7e40: e71f7e3c e71f7e44 e71f7e44 00000000 e74c4730 00000001 e71f7f40 e71f7ec8
[   27.012854] 7e60: 00000000 e71f6000 0004cfb0 c01508d4 0004cfb0 00000000 00000069 e74c46a8
[   27.012854] 7e80: 00000000 fffffdee 0004ce1c 00000000 e71dc700 e71f7f80 00000069 0004cfb0
[   27.012854] 7ea0: 00000000 e71dc700 e71f7f80 00000054 e71f6000 00000000 beed79fc c00d2030
[   27.012854] 7ec0: 0004cfb0 00000000 33de2400 00000006 00000000 00000001 ffffffff e71dc700
[   27.012854] 7ee0: 00000000 00000000 00000000 00000000 e71fc000 00000000 00000000 00000000
[   27.012854] 7f00: 0004cfb0 00000000 e71f7f18 c0063a7c 00000054 00000200 00000054 e71dc780
[   27.012854] 7f20: e71dc788 00000001 c0122834 e71dc780 00000001 00000000 e7999880 00000200
[   27.012854] 7f40: beed764c 00000054 e71dc700 00000054 e71dc700 beed764c e71f7f80 c00d270c
[   27.012854] 7f60: e71dc700 beed764c e71dc700 beed764c 0004cfb0 00000000 00000054 c00d296c
[   27.012854] 7f80: 0004cfb0 00000000 00000054 00000000 400130e8 beed7648 beed764c 00000004
[   27.012854] 7fa0: c00352a8 c0035100 400130e8 beed7648 00000003 beed764c 00000054 5a477d66
[   27.012854] 7fc0: 400130e8 beed7648 beed764c 00000004 beed7648 0000aaee 00000000 beed79fc
[   27.012854] 7fe0: 40013154 beed7638 40011963 40081474 60000010 00000003 00000000 00000000
[   27.012854] [<c0040f44>] (cpu_v7_set_pte_ext+0x0/0x50) from [<c009ff8c>] (iov_iter_copy_from_user_atomic+0x38/0x94)
[   27.012854] [<c009ff8c>] (iov_iter_copy_from_user_atomic+0x38/0x94) from [<c00a00f4>] (generic_file_buffered_write+0x10c/0x224)
[   27.012854] [<c00a00f4>] (generic_file_buffered_write+0x10c/0x224) from [<c00a1d44>] (__generic_file_aio_write+0x3e8/0x438)
[   27.012854] [<c00a1d44>] (__generic_file_aio_write+0x3e8/0x438) from [<c00a1dfc>] (generic_file_aio_write+0x68/0xd4)
[   27.012854] [<c00a1dfc>] (generic_file_aio_write+0x68/0xd4) from [<c01508d4>] (ext4_file_write+0x254/0x2b4)
[   27.012854] [<c01508d4>] (ext4_file_write+0x254/0x2b4) from [<c00d2030>] (do_sync_write+0x94/0xd4)
[   27.012854] [<c00d2030>] (do_sync_write+0x94/0xd4) from [<c00d270c>] (vfs_write+0xb0/0x138)
[   27.012854] [<c00d270c>] (vfs_write+0xb0/0x138) from [<c00d296c>] (sys_write+0x3c/0x68)
[   27.012854] [<c00d296c>] (sys_write+0x3c/0x68) from [<c0035100>] (ret_fast_syscall+0x0/0x30)
[   27.012854] Code: f57ff06f ee0d1f30 f57ff06f e1a0f00e (e5801000)
[   27.795932] ---[ end trace 6c1e12576e793e59 ]---
[   27.800569] Kernel panic - not syncing: Fatal exception
[   27.805812] [<c003aa64>] (unwind_backtrace+0x0/0x11c) from [<c051cc18>] (panic+0x58/0x17c)
[   27.814108] [<c051cc18>] (panic+0x58/0x17c) from [<c0038edc>] (die+0x26c/0x2bc)
[   27.821434] [<c0038edc>] (die+0x26c/0x2bc) from [<c003e0a0>] (__do_kernel_fault+0x64/0x84)
[   27.829696] [<c003e0a0>] (__do_kernel_fault+0x64/0x84) from [<c003e318>] (do_page_fault+0x258/0x278)
[   27.838853] [<c003e318>] (do_page_fault+0x258/0x278) from [<c002f1f8>] (do_DataAbort+0x30/0x98)
[   27.847573] [<c002f1f8>] (do_DataAbort+0x30/0x98) from [<c0034a50>] (__dabt_svc+0x70/0xa0)
[   27.855852] Exception stack(0xe71f7cf0 to 0xe71f7d38)
[   27.860917] 7ce0:                                     7f000400 76f7024f 00000000 0000024f
[   27.869090] 7d00: fff00000 c17a8e00 00000050 00000fb0 00000000 00000000 e71dc700 00000fb0
[   27.877282] 7d20: 00000020 e71f7d38 c00405f0 c0040f44 20000013 ffffffff
[   27.883916] [<c0034a50>] (__dabt_svc+0x70/0xa0) from [<c0040f44>] (cpu_v7_set_pte_ext+0x0/0x50)
[   27.892639] [<c0040f44>] (cpu_v7_set_pte_ext+0x0/0x50) from [<c009ff8c>] (iov_iter_copy_from_user_atomic+0x38/0x94)
[   27.903102] [<c009ff8c>] (iov_iter_copy_from_user_atomic+0x38/0x94) from [<c00a00f4>] (generic_file_buffered_write+0x10c/0x224)
[   27.914598] [<c00a00f4>] (generic_file_buffered_write+0x10c/0x224) from [<c00a1d44>] (__generic_file_aio_write+0x3e8/0x438)
[   27.925742] [<c00a1d44>] (__generic_file_aio_write+0x3e8/0x438) from [<c00a1dfc>] (generic_file_aio_write+0x68/0xd4)
[   27.936284] [<c00a1dfc>] (generic_file_aio_write+0x68/0xd4) from [<c01508d4>] (ext4_file_write+0x254/0x2b4)
[   27.946041] [<c01508d4>] (ext4_file_write+0x254/0x2b4) from [<c00d2030>] (do_sync_write+0x94/0xd4)
[   27.955019] [<c00d2030>] (do_sync_write+0x94/0xd4) from [<c00d270c>] (vfs_write+0xb0/0x138)
[   27.963384] [<c00d270c>] (vfs_write+0xb0/0x138) from [<c00d296c>] (sys_write+0x3c/0x68)
[   27.971402] [<c00d296c>] (sys_write+0x3c/0x68) from [<c0035100>] (ret_fast_syscall+0x0/0x30)
[   27.979839] Rebooting in 2 seconds..HELLO! BOOT0 is starting!

不断重启中