Alignment trap: not handling instruction

[ngisp]

HI all ,

Below I am trying to run some Bluetooth related scripts but getting below crash . How can I avoid this crash as it is produced randomly and not always.

rm: cannot remove `/var/run/dbus/pid': No such file or directory

BT FW is active(6)

Alignment trap: not handling instruction e19cef9f at [<c018b464>]

Unhandled fault: alignment exception (0x001) at 0x0000009d

Internal error: : 1 [#1] PREEMPT SMP

Modules linked in: bt8xxx

CPU: 0    Not tainted  (3.0.35-2508-g54750ff-ihmv7-svn430 #10)

PC is at dup_fd+0x13c/0x328

LR is at 0x0

pc : [<c018b468>]    lr : [<00000000>]    psr: 20000013

sp : da12def0  ip : 0000009d  fp : dfa12c00

r10: 00000007  r9 : 0000001b  r8 : 00000100

r7 : 00000100  r6 : df933fa0  r5 : 00000001  r4 : dfbb2874

r3 : 0000007d  r2 : 000000e4  r1 : 0000001c  r0 : dfa12c70

Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user

Control: 10c53c7d  Table: 2a0c804a  DAC: 00000015

Process BT_Init.sh (pid: 3273, stack limit = 0xda12c2f8)

Stack: (0xda12def0 to 0xda12e000)

dee0:                                     dffcbee0 dffcb820 01200011 dfee32c0

df00: 01200011 da12c000 00000000 c080a700 dfee33e4 000001c0 00000000 c00fb1a4

df20: 000010e9 00000000 00000000 dfee345c bed15818 da12dfb0 da1203c0 fffffff4

df40: 00000001 01200011 00000000 da12dfb0 00000000 bed15818 da12c000 00000000

df60: bed15834 c00fb95c 40076068 00000000 00000000 00000000 0000021c 00000000

df80: 00000000 00000000 00000001 00000000 40076068 00000000 40281000 00000078

dfa0: c00cc144 c00cbfc0 00000000 40076068 01200011 00000000 00000000 00000000

dfc0: 40076068 00000000 40281000 00000078 00000cc9 000abc48 000ac368 bed15834

dfe0: 400764c0 bed15818 00000000 401f1b48 60000010 01200011 00000000 00000000

[<c018b468>] (dup_fd+0x13c/0x328) from [<c00fb1a4>] (copy_process+0x5ec/0xce4)

[<c00fb1a4>] (copy_process+0x5ec/0xce4) from [<c00fb95c>] (do_fork+0x9c/0x264)

[<c00fb95c>] (do_fork+0x9c/0x264) from [<c00cbfc0>] (ret_fast_syscall+0x0/0x30)

Code: e3a01000 e58d5000 ea000009 e19cef9f (e28ee001)

---[ end trace 125b5a44c9432aed ]---

note: BT_Init.sh[3273] exited with preempt_count 1

BUG: scheduling while atomic: BT_Init.sh/3273/0x40000002

Modules linked in: bt8xxx

[<c00d2774>] (unwind_backtrace+0x0/0xf8) from [<c05bd654>] (__schedule+0x4c0/0x6c0)

[<c05bd654>] (__schedule+0x4c0/0x6c0) from [<c00f7bbc>] (__cond_resched+0x24/0x34)

[<c00f7bbc>] (__cond_resched+0x24/0x34) from [<c05bd8ec>] (_cond_resched+0x34/0x44)

[<c05bd8ec>] (_cond_resched+0x34/0x44) from [<c015b620>] (unmap_vmas+0x40c/0x670)

[<c015b620>] (unmap_vmas+0x40c/0x670) from [<c0160e38>] (exit_mmap+0x108/0x248)

[<c0160e38>] (exit_mmap+0x108/0x248) from [<c00fa508>] (mmput+0x48/0xf4)

[<c00fa508>] (mmput+0x48/0xf4) from [<c00fe510>] (exit_mm+0x128/0x168)

[<c00fe510>] (exit_mm+0x128/0x168) from [<c00ffe78>] (do_exit+0x570/0x6e8)

[<c00ffe78>] (do_exit+0x570/0x6e8) from [<c00cf73c>] (die+0x228/0x284)

[<c00cf73c>] (die+0x228/0x284) from [<c00c63dc>] (do_DataAbort+0x8c/0x9c)

[<c00c63dc>] (do_DataAbort+0x8c/0x9c) from [<c00cb990>] (__dabt_svc+0x70/0xa0)

Exception stack(0xda12dea8 to 0xda12def0)

dea0:                   dfa12c70 0000001c 000000e4 0000007d dfbb2874 00000001

dec0: df933fa0 00000100 00000100 0000001b 00000007 dfa12c00 0000009d da12def0

dee0: 00000000 c018b468 20000013 ffffffff

[<c00cb990>] (__dabt_svc+0x70/0xa0) from [<c018b468>] (dup_fd+0x13c/0x328)

[<c018b468>] (dup_fd+0x13c/0x328) from [<c00fb1a4>] (copy_process+0x5ec/0xce4)

[<c00fb1a4>] (copy_process+0x5ec/0xce4) from [<c00fb95c>] (do_fork+0x9c/0x264)

[<c00fb95c>] (do_fork+0x9c/0x264) from [<c00cbfc0>] (ret_fast_syscall+0x0/0x30)

./BT_Demo.sh: line 36:  3273 Segmentation fault      ./BT_Init.sh

Regards

[igorpadykov]

Hi sn

I would suggest to request updated driver and firmware for that chip from

vendor, since firmware of Bluetooth chips even with the same marking may differ,

chip vendor can provide frimware for specific chip revision.

Best regards

igor

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[ngisp]

Hey igor ,

Thanks for the quick reply . Issue is this crash does not occur everytime , sometimes the BT works just fine scan connect transfer. I have tried implementing what is mentioned in this link

http://blog.galemin.com/tag/codesourcery/

but of no use though. cr = 10c53c7d always with and without modification. HOw can we add EXTRA_CFLAGS=-mno-unaligned-access anywhere in filesytem in dist/lfs-5.1/bluez-libs/bluez-libs.spec

Boot log observed is

the [ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7d

Regards

[ngisp]

Hey igor :smileyhappy:,

Thanks for the quick reply . Issue is this crash does not occur everytime , sometimes the BT works just fine scan connect transfer. I have tried implementing what is mentioned in this link

http://blog.galemin.com/tag/codesourcery/

but of no use though. cr = 10c53c7d always with and without modification. HOw can we add EXTRA_CFLAGS=-mno-unaligned-access anywhere in filesytem in dist/lfs-5.1/bluez-libs/bluez-libs.spec 

Boot log observed is

the [ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7d

Regards

sn