On Fri, 17 Jun 2016, Ian Lepore wrote: > On Fri, 2016-06-17 at 07:52 -0700, Adrian Chadd wrote: >> Just disable 11n for now. ifconfig wlan0 -ht (and reassociate.) >> >> See if it's that. >> >> >> >> -adrian >> > > You can see from the crash info that it's an alignment fault: > > r6 =c21a4876 > ldmib r6,{r1-r2} > > An ldm instruction requires 4-byte alignment. Now the question is why > undefining __NO_STRICT_ALIGNMENT didn't fix the problem. Maybe the > wifi code doesn't use __NO_STRICT_ALIGNMENT the same way other network > drivers do? > > Unfortunately the pasted info lists the nearby symbol as $a.17+0x38, > which doesn't help find the actual code. A stack backtrace might help. > > -- Ian > ... What do I need to type at the "db> " prompt that would be useful? I should be able to access the RPI-B in 5 hours. Here's the result of a "where" taken from an earlier logged session (different r6 value): Fatal kernel mode data abort: 'Alignment Fault' on read trapframe: 0xd3c8c8c0 FSR=00000001, FAR=c218607a, spsr=60000013 r0 =c07a6548, r1 =00000004, r2 =c06059f6, r3 =000007b6 r4 =d3c8ca28, r5 =d3c8cb40, r6 =c2186076, r7 =c1dd4ce0 r8 =c1dd4ce0, r9 =c2186076, r10=d3c8cb40, r11=d3c8c988 r12=00000000, ssp=d3c8c950, slr=c1b50370, pc =c0449ff8 [ thread pid 13 tid 100036 ] Stopped at $a.17+0x38: ldmib r6, {r1-r2} db> where Tracing pid 13 tid 100036 td 0xc1b50370 db_trace_self() at db_trace_self pc = 0xc055c774 lr = 0xc0145be4 ($a.19+0xf4) sp = 0xd3c8c5b8 fp = 0xd3c8c5d0 $a.19() at $a.19+0xf4 pc = 0xc0145be4 lr = 0xc0145838 ($a.11+0x250) sp = 0xd3c8c5d8 fp = 0xd3c8c678 r4 = 0x00000001 r5 = 0x00000000 r6 = 0xc05fb0e7 r10 = 0xc07ab1a8 $a.11() at $a.11+0x250 pc = 0xc0145838 lr = 0xc01455c0 (db_command_loop+0x5c) sp = 0xd3c8c680 fp = 0xd3c8c690 r4 = 0xc05c8ec6 r5 = 0xc05ead58 r6 = 0xc07ab194 r7 = 0xc06b7ea0 r8 = 0xc079ed28 r9 = 0xc079ed2c r10 = 0x00000000 db_command_loop() at db_command_loop+0x5c pc = 0xc01455c0 lr = 0xc014872c (db_trap+0xec) sp = 0xd3c8c698 fp = 0xd3c8c7b0 r4 = 0x00000001 r5 = 0x00000000 r6 = 0xc07ab1a0 r10 = 0x00000000 db_trap() at db_trap+0xec pc = 0xc014872c lr = 0xc02f83b0 (kdb_trap+0xb8) sp = 0xd3c8c7b8 fp = 0xd3c8c7d8 r4 = 0x00000000 r5 = 0x00000001 r6 = 0xc079ed48 r10 = 0x00000000 kdb_trap() at kdb_trap+0xb8 pc = 0xc02f83b0 lr = 0xc05770b4 ($a.4+0x1c0) sp = 0xd3c8c7e0 fp = 0xd3c8c800 r4 = 0xd3c8c8c0 r5 = 0x00000013 r6 = 0xc218607a r7 = 0x00000001 r8 = 0x00000001 r9 = 0xc1b50370 r10 = 0x00000000 $a.4() at $a.4+0x1c0 pc = 0xc05770b4 lr = 0xc0577190 ($a.7+0x78) sp = 0xd3c8c808 fp = 0xd3c8c820 r4 = 0xc218607a r5 = 0xd3c8c840 r6 = 0x00000001 r7 = 0x00000001 r8 = 0x00000013 r10 = 0x00000000 $a.7() at $a.7+0x78 pc = 0xc0577190 lr = 0xc0576eac (abort_handler+0x438) sp = 0xd3c8c828 fp = 0xd3c8c8b8 r4 = 0xd3c8c8c0 r5 = 0xc0577118 abort_handler() at abort_handler+0x438 pc = 0xc0576eac lr = 0xc055eed0 (exception_exit) sp = 0xd3c8c8c0 fp = 0xd3c8c988 r4 = 0xd3c8ca28 r5 = 0xd3c8cb40 r6 = 0xc2186076 r7 = 0xc1dd4ce0 r8 = 0xc1dd4ce0 r9 = 0xc2186076 r10 = 0xd3c8cb40 exception_exit() at exception_exit pc = 0xc055eed0 lr = 0xc1b50370 (0xc1b50370) sp = 0xd3c8c950 fp = 0xd3c8c988 r0 = 0xc07a6548 r1 = 0x00000004 r2 = 0xc06059f6 r3 = 0x000007b6 r4 = 0xd3c8ca28 r5 = 0xd3c8cb40 r6 = 0xc2186076 r7 = 0xc1dd4ce0 r8 = 0xc1dd4ce0 r9 = 0xc2186076 r10 = 0xd3c8cb40 r12 = 0x00000000 $a.17() at $a.17+0x3c pc = 0xc0449ffc lr = 0xc0449068 (syncache_expand+0x10c) sp = 0xd3c8c990 fp = 0xd3c8cad8 r4 = 0xc1dd4cf0 r5 = 0xc23c9000 r6 = 0xc1f65208 r7 = 0xd3c8ca28 r8 = 0xc1dd4ce0 r9 = 0xc2186076 r10 = 0xd3c8cb40 syncache_expand() at syncache_expand+0x10c pc = 0xc0449068 lr = 0xc0438df8 ($a.21+0x100) sp = 0xd3c8cae0 fp = 0xd3c8cbb0 r4 = 0xc0604081 r5 = 0xc23b53a8 r6 = 0xd3c8cb6c r7 = 0xc2186076 r8 = 0xc23b54a4 r9 = 0x00000000 r10 = 0xc07ae0d8 $a.21() at $a.21+0x100 pc = 0xc0438df8 lr = 0xc03bf95c (ip_input+0x230) sp = 0xd3c8cbb8 fp = 0xd3c8cbf0 r4 = 0xc2186062 r5 = 0xc1e068e0 r6 = 0x00000003 r7 = 0x00000000 r8 = 0x00000000 r9 = 0xc06ff570 r10 = 0xc07ad790 ip_input() at ip_input+0x230 pc = 0xc03bf95c lr = 0xc039e7dc (netisr_dispatch_src+0xa8) sp = 0xd3c8cbf8 fp = 0xd3c8cc20 r4 = 0x00000001 r5 = 0xc07a59b4 r6 = 0x00000000 r7 = 0xc07a59b0 r8 = 0xc2102a00 r9 = 0xc05fd75c r10 = 0xc2102a00 netisr_dispatch_src() at netisr_dispatch_src+0xa8 pc = 0xc039e7dc lr = 0xc03996cc (ether_demux+0x198) sp = 0xd3c8cc28 fp = 0xd3c8cc40 r4 = 0xc1b2a800 r5 = 0x00000800 r6 = 0xc2102a10 r7 = 0x00000800 r8 = 0xc2186054 r9 = 0xc05fd75c r10 = 0xc2102a00 ether_demux() at ether_demux+0x198 pc = 0xc03996cc lr = 0xc039a610 ($a.29+0x39c) sp = 0xd3c8cc48 fp = 0xd3c8cc68 r4 = 0xc1b2a800 r5 = 0xc2102a00 r6 = 0xc2102a10 r10 = 0xc2102a00 $a.29() at $a.29+0x39c pc = 0xc039a610 lr = 0xc039e7dc (netisr_dispatch_src+0xa8) sp = 0xd3c8cc70 fp = 0xd3c8cc98 r4 = 0x00000005 r5 = 0xc07a5a34 r6 = 0x00000000 r7 = 0xc07a5a30 r8 = 0xc2102a00 r10 = 0xc2102a00 netisr_dispatch_src() at netisr_dispatch_src+0xa8 pc = 0xc039e7dc lr = 0xc0399a6c ($a.13+0x64) sp = 0xd3c8cca0 fp = 0xd3c8ccc0 r4 = 0xc1b2a800 r5 = 0xc2102a00 r6 = 0x00000000 r7 = 0x00000000 r8 = 0xc05fd734 r9 = 0xc05fd75c r10 = 0xc2102a00 $a.13() at $a.13+0x64 pc = 0xc0399a6c lr = 0xc1ff1170 (sta_input+0x498) sp = 0xd3c8ccc8 fp = 0xd3c8cd08 r4 = 0xc202a000 r5 = 0xc1b2a800 r6 = 0x0000001a r7 = 0xc23720d0 r8 = 0xc2372000 r9 = 0x00000080 sta_input() at sta_input+0x498 pc = 0xc1ff1170 lr = 0xc1f9d4a8 ($a.45+0x3a8) sp = 0xd3c8cd10 fp = 0xd3c8cd88 r4 = 0x00000000 r5 = 0xc1ff0cd8 r6 = 0xc1f2f4e0 r7 = 0xffffffb4 r8 = 0xc1f37030 r9 = 0xc2102a00 r10 = 0xc2372000 $a.45() at $a.45+0x3a8 pc = 0xc1f9d4a8 lr = 0xc01ca260 ($a.10+0x744) sp = 0xd3c8cd90 fp = 0xd3c8cdd0 r4 = 0xc1f37173 r5 = 0xc0710948 r6 = 0xc05d677d r7 = 0xc1f37000 r8 = 0xc1f37030 r9 = 0xc1f37030 r10 = 0xc1f370c0 $a.10() at $a.10+0x744 pc = 0xc01ca260 lr = 0xc01cb48c (usb_command_wrapper+0x150) sp = 0xd3c8cdd8 fp = 0xd3c8cdf0 r4 = 0xc1f37030 r5 = 0xc0710948 r6 = 0xc05d6a58 r7 = 0xc05d6a7f r8 = 0x00000000 r9 = 0xc05d6a6c r10 = 0xc1b5d094 usb_command_wrapper() at usb_command_wrapper+0x150 pc = 0xc01cb48c lr = 0xc01ca3f8 ($a.12+0x70) sp = 0xd3c8cdf8 fp = 0xd3c8ce00 r4 = 0xc05d677d r5 = 0xc1f37000 r6 = 0xc1f37044 r7 = 0xc05d6094 r8 = 0xc0710994 r9 = 0xc05d60a0 $a.12() at $a.12+0x70 pc = 0xc01ca3f8 lr = 0xc01c51f4 ($a.4+0xc8) sp = 0xd3c8ce08 fp = 0xd3c8ce28 r4 = 0xc1b5d084 r5 = 0xc1b5d08c $a.4() at $a.4+0xc8 pc = 0xc01c51f4 lr = 0xc0284a44 (fork_exit+0x80) sp = 0xd3c8ce30 fp = 0xd3c8ce48 r4 = 0xc1b50370 r5 = 0xc1ac8720 r6 = 0xc01c512c r7 = 0xc1b5d084 r8 = 0xd3c8ce50 r9 = 0x00000000 r10 = 0x00000000 fork_exit() at fork_exit+0x80 pc = 0xc0284a44 lr = 0xc055ee5c (swi_exit) sp = 0xd3c8ce50 fp = 0x00000000 r4 = 0xc01c512c r5 = 0xc1b5d084 r6 = 0x00000000 r7 = 0x00000000 r8 = 0x00000000 r10 = 0x00000000 swi_exit() at swi_exit pc = 0xc055ee5c lr = 0xc055ee5c (swi_exit) sp = 0xd3c8ce50 fp = 0x00000000 db> ...keithReceived on Fri Jun 17 2016 - 14:28:44 UTC
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