[Samsung Galaxy Nexus] renaud:
That's because the logs don't show anything at all. In fact the log is from when the AP is first activated. There is no additional log when you shut it down, it crashes instantly.

The right log of the crash is:

[ 151.164154] Unable to handle kernel NULL pointer dereference at virtual address 00000002
[ 151.164367] pgd = c6e68000
[ 151.164489] [00000002] *pgd=00000000
[ 151.164733] Internal error: Oops: 5 [#1] PREEMPT SMP
[ 151.164916] CPU: 0 Not tainted (3.0.43-FuguMod #655)
[ 151.165039] pc : [<c02d8108>] lr : [<c02d8084>] psr: a0000013
[ 151.165039] sp : c1d6de08 ip : c02d6318 fp : c7380444
[ 151.165313] r10: c71afb00 r9 : c721b000 r8 : 0001112c
[ 151.165527] r7 : 00011128 r6 : c7380444 r5 : c73804b4 r4 : c7380320
[ 151.165618] r3 : 00000000 r2 : 00000002 r1 : c71afb68 r0 : 00000000
[ 151.165832] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 151.165924] Control: 10c5387d Table: 86e6804a DAC: 00000015
[ 151.166137]
[ 151.166137] PC: 0xc02d8088:
[ 151.166320] 8088 e35c0000 0a000007 e7943008 e3130040 0a000004 e1a00004 e1a0100b e3a02006
[ 151.167297] 80a8 e3a03000 e12fff3c e5963070 e1a0b006 e2436070 e28b3070 e1550003 1affffe6
[ 151.168365] 80c8 e59a3070 e1a0600a e243a070 e2863070 e1550003 1afffef3 e5943000 e3a02002
[ 151.169342] 80e8 e5933010 e5933168 e5832004 e59d300c e3530000 0a000006 e59f307c e7943003
[ 151.170410] 8108 e5d33002 e3530000 0a000001 e59d000c eb038df6 e1a00004 eb00175d e1a00004
[ 151.171478] 8128 ebffd337 e1a00004 ebffafa1 e59f304c e7d43003 e3530000 0a000001 e1a00004
[ 151.172515] 8148 eb0010ca eb001537 e59d0008 eb089398 e3a00000 e28dd014 e8bd8ff0 c0650910
[ 151.173522] 8168 c05b347d c052a630 c05b3495 c0702944 c052a641 00011128 0001112c 00011100
[ 151.174560]
[ 151.174591] LR: 0xc02d8004:
[ 151.174774] 8004 e794c007 e59d3004 e35c0000 0a000007 e7942008 e3120080 0a000004 e1a01003
[ 151.175842] 8024 e1a00004 e3a02007 e3a03000 e12fff3c e5992070 e1a03009 e2429070 e2832070
[ 151.176910] 8044 e1550002 1affffe4 e5943194 e5969000 e5936000 e243b070 e2466070 ea000015
[ 151.177978] 8064 e3590000 0a000010 e59b3000 e1530009 1a00000d e3a00006 e28b1068 ebfb8ddb
[ 151.178955] 8084 e794c007 e35c0000 0a000007 e7943008 e3130040 0a000004 e1a00004 e1a0100b
[ 151.180023] 80a4 e3a02006 e3a03000 e12fff3c e5963070 e1a0b006 e2436070 e28b3070 e1550003
[ 151.181091] 80c4 1affffe6 e59a3070 e1a0600a e243a070 e2863070 e1550003 1afffef3 e5943000
[ 151.182159] 80e4 e3a02002 e5933010 e5933168 e5832004 e59d300c e3530000 0a000006 e59f307c
[ 151.183135]
[ 151.183135] SP: 0xc1d6dd88:
[ 151.183410] dd88 c1839380 c782da00 c4cb0e00 c00ad158 c71afb00 c1d6ddd8 c73804c4 c02c97e4
[ 151.184387] dda8 00000000 ffffffff c1d6ddf4 c7380444 00011128 c004d5ec 00000000 c71afb68
[ 151.185455] ddc8 00000002 00000000 c7380320 c73804b4 c7380444 00011128 0001112c c721b000
[ 151.186523] dde8 c71afb00 c7380444 c02d6318 c1d6de08 c02d8084 c02d8108 a0000013 ffffffff
[ 151.187591] de08 00000001 c71afb00 c7380508 c721c800 c7143000 c7143000 c1d6de78 c721b000
[ 151.188568] de28 00001003 00000000 00000000 b64f6d0c c721b000 c02a36ac c02a3610 c721b000
[ 151.189636] de48 c1d6de78 00000001 00001003 00000001 00000000 b64f6d0c c721b000 c03bb7b4
[ 151.190643] de68 c721b058 c721b000 00001042 c03bb808 c721b058 c721b058 c03be9cc c03bed34
[ 151.191619]
[ 151.191619] IP: 0xc02d6298:
[ 151.191894] 6298 c052a541 c05b3e93 c05b3e81 c05b72a2 c05b3e86 c05b3e8f c05b632d c05b634a
[ 151.192962] 62b8 c05b6369 c052a55a c05b6386 c05adf00 00011100 c05b63ae c05b63b3 c05b63cd
[ 151.193939] 62d8 c05b63e3 c05b63f6 c05b639a c05b6409 c05b6425 00011130 c05b6438 0001112c
[ 151.195007] 62f8 00011128 c05b6456 c052a575 c05b6475 c05b6489 c05b649b c05b64b7 c05b64d2
[ 151.195983] 6318 e92d4ff0 e1a08001 e24dd024 e3a01002 e2534000 e3a07000 e58d1014 e1a05000
[ 151.196960] 6338 e5901000 e58d7018 e58d701c e5911010 e58d100c 0a0000fc e3520004 11a04007
[ 151.198028] 6358 1a0001ae e1a06000 e5b62194 e2423070 e5922000 e2422070 ea000008 e5931000
[ 151.199066] 6378 e3510000 0a000002 e5933068 e3130010 12877001 e5921070 e1a03002 e2412070
[ 151.200134]
[ 151.200134] FP: 0xc73803c4:
[ 151.200347] 03c4 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.201293] 03e4 c02d365c 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.202270] 0404 00000000 00000000 00000000 c02db408 00000000 00000000 00000000 00000000
[ 151.203308] 0424 c02dbb28 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.204345] 0444 00000000 c02d0f10 c02dbb28 00000000 c02d365c 00000000 00000000 c02d365c
[ 151.205352] 0464 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.206329] 0484 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.207366] 04a4 00000000 00000000 c73804ac c73804ac c71afb70 c71afb70 00000000 00000000
[ 151.208404]
[ 151.208404] R1: 0xc71afae8:
[ 151.208618] fae8 00000000 00000000 00000000 00000000 00000000 00000000 c721b000 c70ddf00
[ 151.209655] fb08 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.210693] fb28 00000000 00000000 00000000 00000000 00000002 00000000 000fac04 000fac04
[ 151.211639] fb48 000fac02 00000000 00000000 9d160000 00206e7c 01000064 00000002 ffffffff
[ 151.212677] fb68 00000000 00000000 c73804b4 c73804b4 00000000 00000000 f000054d 00000004
[ 151.213714] fb88 c71afbe0 00018124 00000000 00000000 00000000 00000000 c050b960 c055dfe0
[ 151.214782] fba8 c71afa00 c714b000 00000000 c727e000 00000000 00000000 00000001 00000000
[ 151.215728] fbc8 00000000 00000000 00000000 c71afbd4 c71afbd4 00000000 30703270 00000000
[ 151.216766]
[ 151.216796] R4: 0xc73802a0:
[ 151.216979] 02a0 00000002 00000000 00000000 00000000 00000000 00000000 ffff6c4a 00000000
[ 151.218017] 02c0 00000000 00000000 00000000 00000000 00000000 c73802d4 c73802d4 00000000
[ 151.219055] 02e0 00000000 00000000 00000000 00000000 c73802f0 c73802f0 c7939740 c7939748
[ 151.220092] 0300 c7939748 00000001 c0665048 00000000 00000000 00000000 c74e27f8 00000000
[ 151.221069] 0320 c70ddf00 c7270000 c721c800 c7211b80 00000000 c02d0370 00000000 00000000
[ 151.222106] 0340 c02d0370 00000000 c02d0370 c02d0370 c02d0370 c02d0370 00000000 c02d0370
[ 151.223144] 0360 00000000 c02d0370 00000000 00000000 00000000 c02d0370 c02c94d8 00000000
[ 151.224121] 0380 c02cc958 00000000 00000000 00000000 00000000 00000000 00000000 c02cbf0c
[ 151.225158]
[ 151.225158] R5: 0xc7380434:
[ 151.225433] 0434 00000000 00000000 00000000 00000000 00000000 c02d0f10 c02dbb28 00000000
[ 151.226409] 0454 c02d365c 00000000 00000000 c02d365c 00000000 00000000 00000000 00000000
[ 151.227447] 0474 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.228485] 0494 00000000 00000000 00000000 00000000 00000000 00000000 c73804ac c73804ac
[ 151.229461] 04b4 c71afb70 c71afb70 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.230499] 04d4 00000000 c73804d8 c73804d8 00000000 00000000 00000000 c73804ec c73804ec
[ 151.231536] 04f4 00000000 00000000 00000000 c7380500 c7380500 00000000 00000000 00000000
[ 151.232574] 0514 c7380514 c7380514 c1839380 c7381370 c725a000 c7211bc0 040000d4 6f6d6544
[ 151.233520]
[ 151.233551] R6: 0xc73803c4:
[ 151.233825] 03c4 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.234771] 03e4 c02d365c 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.235839] 0404 00000000 00000000 00000000 c02db408 00000000 00000000 00000000 00000000
[ 151.236877] 0424 c02dbb28 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.237915] 0444 00000000 c02d0f10 c02dbb28 00000000 c02d365c 00000000 00000000 c02d365c
[ 151.238861] 0464 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.239807] 0484 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.240875] 04a4 00000000 00000000 c73804ac c73804ac c71afb70 c71afb70 00000000 00000000
[ 151.241912]
[ 151.241912] R9: 0xc721af80:
[ 151.242095] af80 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.243133] afa0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.244110] afc0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.245056] afe0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.246093] b000 6e616c77 00000030 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.247131] b020 00000000 00000000 00000000 c780ae68 00000000 00000000 00000000 00000000
[ 151.248107] b040 00000000 00000002 c0808868 c721c848 c721b050 c721b050 c1d6de78 c1d6de78
[ 151.249145] b060 00006000 40004800 00004800 00004020 0000000b 0000000b 00000000 00000000
[ 151.250183]
[ 151.250183] R10: 0xc71afa80:
[ 151.250396] fa80 000002ff 00000000 00000000 01000000 c71fd400 00000000 00000000 00000000
[ 151.251434] faa0 00000000 00000000 00000001 00000000 00000000 00000000 00000000 c068a480
[ 151.252502] fac0 c047ed70 c71afa80 ffffffff 0000000c 00000001 00000001 00000000 00000000
[ 151.253479] fae0 ffff6bdb ffff6bdb 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.254516] fb00 c721b000 c70ddf00 00000000 00000000 00000000 00000000 00000000 00000000
[ 151.255584] fb20 00000000 00000000 00000000 00000000 00000000 00000000 00000002 00000000
[ 151.256561] fb40 000fac04 000fac04 000fac02 00000000 00000000 9d160000 00206e7c 01000064
[ 151.257629] fb60 00000002 ffffffff 00000000 00000000 c73804b4 c73804b4 00000000 00000000
[ 151.258697] Process hostapd (pid: 3129, stack limit = 0xc1d6c2f8)
[ 151.258819] Stack: (0xc1d6de08 to 0xc1d6e000)
[ 151.259002] de00: 00000001 c71afb00 c7380508 c721c800 c7143000 c7143000
[ 151.259216] de20: c1d6de78 c721b000 00001003 00000000 00000000 b64f6d0c c721b000 c02a36ac
[ 151.259338] de40: c02a3610 c721b000 c1d6de78 00000001 00001003 00000001 00000000 b64f6d0c
[ 151.259521] de60: c721b000 c03bb7b4 c721b058 c721b000 00001042 c03bb808 c721b058 c721b058
[ 151.259735] de80: c03be9cc c03bed34 00000006 c721b000 00001003 c727020c c7270200 c03bee24
[ 151.259826] dea0: 00000000 00008914 c727020c c0431848 00000020 c0808820 00000000 6e616c77
[ 151.260040] dec0: 00000030 00000000 00000000 00001042 00000000 00000000 00000000 d278b780
[ 151.260253] dee0: 00000000 00008914 c381ce60 b64f6d0c 00000027 c004dcc4 c1d6c000 b64f6d0c
[ 151.260437] df00: c75bf3a0 c03acc20 b64f6d0c c381ce60 00008914 c0106874 c7652bb0 c0107360
[ 151.260559] df20: 04ce13c0 c01099dc c76ef440 00000000 c76ef440 00000000 c76ef48c c010a920
[ 151.260742] df40: 00000002 c6f40be0 c7574360 00000008 c1d6c000 c780c3c0 c1d6c000 c780c3c0
[ 151.260955] df60: c1d6c000 b64f6d0c c381ce60 00008914 00000027 c004dcc4 c1d6c000 00000000
[ 151.261169] df80: 04ce13c0 c01073e4 00000027 00000000 b64f6d0c 00000001 45313a4c 04cf1650
[ 151.261260] dfa0: 00000036 c004db40 00000001 45313a4c 00000027 00008914 b64f6d0c b64f6d04
[ 151.261474] dfc0: 00000001 45313a4c 04cf1650 00000036 00000001 00000000 00000000 04ce13c0
[ 151.261657] dfe0: 04ce0f28 b64f6ce8 452ead79 452cfb64 80000010 00000027 00000000 00000000
[ 151.261779] Function entered at [<c02d8108>] from [<c02a36ac>]
[ 151.261962] Function entered at [<c02a36ac>] from [<c03bb7b4>]
[ 151.262084] Function entered at [<c03bb7b4>] from [<c03bb808>]
[ 151.262268] Function entered at [<c03bb808>] from [<c03bed34>]
[ 151.262390] Function entered at [<c03bed34>] from [<c03bee24>]
[ 151.262481] Function entered at [<c03bee24>] from [<c0431848>]
[ 151.262695] Function entered at [<c0431848>] from [<c03acc20>]
[ 151.262786] Function entered at [<c03acc20>] from [<c0106874>]
[ 151.263000] Function entered at [<c0106874>] from [<c0107360>]
[ 151.263092] Function entered at [<c0107360>] from [<c01073e4>]
[ 151.263275] Function entered at [<c01073e4>] from [<c004db40>]
[ 151.263397] Code: e3530000 0a000006 e59f307c e7943003 (e5d33002)
[ 151.264038] Board Information: Tuna HW revision: 09 (Maguro 8th Sample), cpu OMAP4460 ES1.1
[ 151.264648] ---[ end trace 61b05c0ebf45c903 ]---
[ 151.264862] Kernel panic - not syncing: Fatal exception
[ 151.264923] CPU1: stopping
[ 151.265014] Function entered at [<c0052c80>] from [<c0048388>]
[ 151.265075] Function entered at [<c0048388>] from [<c004d648>]
[ 151.265228] Exception stack(0xc1ed9e90 to 0xc1ed9ed8)
[ 151.265289] 9e80: 00000500 0000003a 00000015 00000300
[ 151.265441] 9ea0: c65c8000 0000030c c65c8cf4 c051a30c c54568c0 c65c83bc c65c8800 c65c80f4
[ 151.265533] 9ec0: 00000000 c1ed9ed8 00000005 c0216f10 80000013 ffffffff
[ 151.265655] Function entered at [<c004d648>] from [<c0216f10>]
[ 151.265777] Function entered at [<c0216f10>] from [<c0213500>]
[ 151.265869] Function entered at [<c0213500>] from [<c00f8574>]
[ 151.265991] Function entered at [<c00f8574>] from [<c00f8698>]
[ 151.266082] Function entered at [<c00f8698>] from [<c004db40>]
[ 151.266204] Rebooting in 5 seconds..
[ 153.452941] [MIPI-HSI] wrong state : 0000000e, recv_step : 12, size : 13
[ 153.962951] [MIPI-HSI] wrong state : 0000000e, recv_step : 12, size : 13
[ 154.474792] [MIPI-HSI] wrong state : 0000000e, recv_step : 12, size : 13
[ 154.984954] [MIPI-HSI] wrong state : 0000000e, recv_step : 12, size : 13
[ 155.496154] [MIPI-HSI] wrong state : 0000000e, recv_step : 12, size : 13
[ 155.602661]
[ 155.602722] Restarting Linux version 3.0.43-FuguMod (r@fugu) (gcc version 4.7.1 20120402 (prerelease) (crosstool-NG 1.15.3) ) #655 SMP PREEMPT Thu Sep 27 07:50:28 CEST 2012
[ 155.602752]

No errors detected
Boot info:
Last reset was warm software reset (PRM_RSTST=0x2)