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>
...keith
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