T1023RDB Kernel dump for Bad area access

[abineshselvaraj]

Hi,

We are using T1023RDB based custom board for WiFi-AP project. The QorIQ SDK 1.7 is installed and its corresponding boot-images are used for booting this board. The SDK is built with 32-bit configuration (source ./fsl_setup_env -m t1023rdb). While the system is booted and loaded the application software, the following instruction dump is printed on console,

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Poky (Yocto Project Reference Distro) 1.6.1 t1023rdb /dev/ttyS0

t1023rdb login: Unable to handle kernel paging request for data at address 0x61616165
Faulting instruction address: 0xc00f0000
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=8 CoreNet Generic
Modules linked in: aptxdrv(O) aprcvdrv(O) umac(O) ath_dev(PO) ath_rate_atheros(PO) hst_tx99(PO) ath_spectral(PO) ath_dfs(PO))
CPU: 0 PID: 1851 Comm: WTP.exe Tainted: P O 3.12.19-rt30-QorIQ-SDK-V1.7+g6619b8b #2
task: e9135a30 ti: c43e2000 task.ti: c43e2000
NIP: c00f0000 LR: c00efdbc CTR: 00000000
REGS: c43e3d50 TRAP: 0300 Tainted: P O (3.12.19-rt30-QorIQ-SDK-V1.7+g6619b8b)
MSR: 00023002 <CE,FP,ME> CR: 28228488 XER: 20000000
DEAR: 61616165, ESR: 00800000

GPR00: c00efcfc c43e3e00 e9135a30 c8db09c0 000000d0 00000000 000006cb 0002f642
GPR08: 00000000 e9008f84 61616161 00000000 48222442 10ef8dd0 c09f0000 e9008f94
GPR16: e9008f8c c09f0000 00100100 00200200 00000001 e9008f84 e9008f80 c8db001c
GPR24: 00000000 000000d0 c43e2000 c09ec4e8 e9003a40 e901e600 ffffffff c8db0000
NIP [c00f0000] cache_alloc_refill+0x2d0/0x710
LR [c00efdbc] cache_alloc_refill+0x8c/0x710
Call Trace:
[c43e3e00] [28222448] 0x28222448 (unreliable)
[c43e3e60] [c00efcfc] kmem_cache_alloc+0xcc/0x100
[c43e3e80] [c002d714] dup_mm+0x104/0x4d0
[c43e3ec0] [c002e398] copy_process.part.55+0x838/0xe80
[c43e3f10] [c002eb50] do_fork+0xc0/0x2c0
[c43e3f40] [c000fcd4] ret_from_syscall+0x0/0x3c
--- Exception: c00 at 0xfd94c04
LR = 0xfd94e74
Instruction dump:
7c0803a6 7d810120 7d808120 38210060 4e800020 60000000 60000000 60000000
813f0004 3bc0ffff 815f0000 4f900000 <912a0004> 91490000 925f0000 927f0004
---[ end trace e2282300996e3766 ]---

The application software is built with 32 bit configuration. Please suggest the possible ways of getting this instruction dump.

Thanks,

S.Abinesh.

[bpe]

The message you are observing appears when an attempt is made to access
an invalid address. It is a generic bad pointer, not necessarily a
physical address width or 32/64 bit mode issue. The basic recommendation in
this regard it to debug your software.

More information can be found at the links below:

http://stackoverflow.com/questions/26925114/what-is-the-error-of-linux-unable-to-handle-kernel-pagin...
http://stackoverflow.com/questions/13804682/bug-unable-to-handle-kernel-paging-request-at
http://www.makelinux.net/ldd3/chp-4-sect-5

The call trace in your console log shows kernel memory allocation related
calls, it may be either due to improper use of that API (e.g. an access
to a deallocated object) or some kernel upstream ussue. It may be useful
to try the same software with a more recent QorIQ SDK, built around a
newer kernel.

Have a great day,
Platon

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