Okay, I've built the same kernel config but without kgdb enabled.
Running cyclictest with a tracer enabled (-f in this case) causes the
crash below.
I'm not big on debugging these things yet. Since cyclictest works
without the tracers enabled and causes a crash with them enabled, the
problem must be in the tracers themselves, right? Actually, 'echo
function > current_tracer' has the same effect.
Is that trace really saying that the processor is in mode 0? AFAICT,
ARM does not have a mode 0 unless you truncate the mode number to four
bits - in which case mode '0' is user mode. The process name seems to
be a red herring - repeating this can turn up almost any process
running on the system, from interrupt handler threads to bash.
Is this a known problem? Any tips on figuring it out?
Sebastian, sorry for the repeat - hit the wrong reply button the first time.
Thanks,
Tom
pi@raspberrypi:~/rt-tests$ sudo ./cyclictest -p95 -m -f -b 2000
# /dev/cpu_dma_latency set to 0us
[ 199.186167] Bad mode in data abort handler detected
[ 199.186194] Internal error: Oops - bad mode: 0 [#1] PREEMPT ARM
[ 199.186246] Modules linked in: snd_bcm2835 snd_pcm snd_seq
snd_timer snd_seq_device snd snd_page_alloc
[ 199.186260] CPU: 0 Not tainted (3.6.11-rt31+ #1)
[ 199.186297] PC is at ring_buffer_lock_reserve+0x7c/0x144
[ 199.186326] LR is at vfs_write+0x140/0x188
[ 199.186341] pc : [<c009486c>] lr : [<c00efda4>] psr: 600001d1
[ 199.186341] sp : da645ef8 ip : da645e28 fp : da645f6c
[ 199.186348] r10: 00000000 r9 : 00000000 r8 : 00000008
[ 199.186357] r7 : 200001d1 r6 : c030226c r5 : c012cd64 r4 : c0732000
[ 199.186366] r3 : 200001d1 r2 : 00000018 r1 : 00000000 r0 : db801420
[ 199.186375] Flags: nZCv IRQs off FIQs off Mode FIQ_32 ISA ARM
Segment user
[ 199.186384] Control: 00c5387d Table: 1a7f8008 DAC: 00000015
[ 199.186396] Process cyclictest (pid: 2035, stack limit = 0xda644268)
[ 199.186406] Stack: (0xda645ef8 to 0xda646000)
[ 199.186417] 5ee0:
db801420 00000000
[ 199.186434] 5f00: 00000018 200001d1 c0732000 c012cd64 c030226c
200001d1 00000008 00000000
[ 199.186451] 5f20: 00000000 da645f6c da645e28 da645ef8 c00efda4
c009486c 600001d1 ffffffff
[ 199.186467] 5f40: db408988 da6e52c8 da6e52c0 0000fc10 00000008
00000004 00000000 00000000
[ 199.186483] 5f60: da645fa4 da645f70 c00f002c c00efc70 00000008
00000000 00000001 00000000
[ 199.186499] 5f80: 00000004 00000004 00000001 0000001a c000e248
da644000 00000000 da645fa8
[ 199.186515] 5fa0: c000dfc0 c00effec 00000004 00000001 00000004
0000fc10 00000008 00000063
[ 199.186531] 5fc0: 00000004 00000001 0000001a 00000004 00019798
0000fc10 00000008 00000001
[ 199.186547] 5fe0: 0000000e beca42c0 0000b7bc b6f7a6fc 60000010
00000004 00000000 00000000
[ 199.186595] [<c009486c>] (ring_buffer_lock_reserve+0x7c/0x144) from
[<c00f002c>] (sys_write+0x4c/0x78)
[ 199.186639] [<c00f002c>] (sys_write+0x4c/0x78) from [<c000dfc0>]
(ret_fast_syscall+0x0/0x48)
[ 199.186659] Code: eb0df889 e3a00000 e89da830 e5941010 (e591cd4c)
[ 199.497152] ---[ end trace 0000000000000002 ]---
[ 199.497169] Kernel panic - not syncing: Fatal exception
[ 199.515555] Bad mode in prefetch abort handler detected
[ 199.515584] Internal error: Oops - bad mode: 0 [#2] PREEMPT ARM
[ 199.515632] Modules linked in: snd_bcm2835 snd_pcm snd_seq
snd_timer snd_seq_device snd snd_page_alloc
[ 199.515644] CPU: 0 Tainted: G D (3.6.11-rt31+ #1)
[ 199.515660] PC is at 0xbe6f00b0
[ 199.515671] LR is at 0xb6ee67d4
[ 199.515684] pc : [<be6f00b0>] lr : [<b6ee67d4>] psr: 800001d1
[ 199.515684] sp : da46ffb0 ip : 00000000 fp : b5ca8fac
[ 199.515691] r10: b5ca96a4 r9 : b5ca8fb0 r8 : 00000000
[ 199.515700] r7 : 00000003 r6 : b5ca9684 r5 : b6cf62dc r4 : b6cf42e4
[ 199.515708] r3 : 00000000 r2 : 00000fff r1 : b6cf42e4 r0 : 000008fe
[ 199.515717] Flags: Nzcv IRQs off FIQs off Mode FIQ_32 ISA ARM
Segment user
[ 199.515725] Control: 00c5387d Table: 1a434008 DAC: 00000015
[ 199.515735] Process rsyslogd (pid: 1700, stack limit = 0xda46e268)
[ 199.515744] Stack: (0xda46ffb0 to 0xda470000)
[ 199.515759] ffa0: 000008fe
b6cf42e4 00000fff 00000000
[ 199.515776] ffc0: b6cf42e4 b6cf62dc b5ca9684 00000003 00000000
b5ca8fb0 b5ca96a4 b5ca8fac
[ 199.515793] ffe0: 00000000 da46ffb0 b6ee67d4 be6f00b0 800001d1
ffffffff 1bffe821 1bffec21
[ 199.515900] Code: 00000000 00000000 00000000 00000000 (00000000)
On Fri, May 3, 2013 at 5:05 PM, Sebastian Andrzej Siewior
<bigeasy@xxxxxxxxxxxxx> wrote:
> * Tom Cook | 2013-04-29 08:16:35 [+0100]:
>
>>No ideas?
>
> what about trying without kgdb?
>
> Sebastian
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