Re: Segmentation fault while running some applications!

Hi Greg,

I recompiled my kernel and used "None" option instead of uClibc,
uC-libc or glibc in menuconfig. (because i am also having issues in
compilation when i select options other than 'None' while library
selection)
This time when i ran iptables -v, i got the following dump:

iptables[377] killed because of sig - 11

STACK DUMP:

0xbec1dd50: 00029b74 00000000 00009d34 00000000 00000000 400e7ff0 401f8000

0xbec1dd6c: bec1deb4 00000002 00009ddc 00029b74 00000000 00009d34 00000000

0xbec1dd88: 00000000 00000000 40025000 00000000 bec1dd68 400e7fa8 ffff3b24

0xbec1dda4: 00000000 00000000 40025000 40025878 bec1de64 400256c0 00000000

0xbec1ddc0: 00000000 00000000 00000000 00000004 00000000 00000000 00000000

0xbec1dddc: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

0xbec1ddf8: 00000000 00000000 00000000 00000000 00000000 00000000 400de5cc

0xbec1de14: 4001d8d8 00000000 0177ff8e 00000000 4001dbd0 4001e3d0 00008df4

0xbec1de30: 400256c0 40025000 00000000 4001df30 0003e998 4000de14 4001dbd0

0xbec1de4c: 00000001 00000001 00000000 400256c0 bec1dec0 00000000 400de5cc



Pid: 377, comm:             iptables

CPU: 0    Not tainted  (2.6.30.4-uc0 #190)

PC is at 0x401446c4

LR is at 0x9e08

pc : [<401446c4>]    lr : [<00009e08>]    psr: 60000010

sp : bec1dd50  ip : 401446c0  fp : 00000000

r10: 40025000  r9 : 00000000  r8 : 00000000

r7 : 00000002  r6 : bec1deb4  r5 : bec1df8d  r4 : fffec998

r3 : fffec998  r2 : 00000000  r1 : fffec998  r0 : fffec998

Flags: nZCv  IRQs on  FIQs on  Mode USER_32  ISA ARM  Segment user

Control: 0005317f  T_coredump+0x168/0xb14)

 r5:bec1de68 r4:0000000a

[<c008acc8>]oredump+0x0/0xb14) from [<c004b318>] (get_signa8)

[<c004b040>] (get_signal_ter+0x0/0x318al+0x0_notify_resume+0x30/0x34)

[<c0028a3c>] (do_notify_resume+0x0/from [<c0025e0c>] (work_pending+0x1c/0x20)

00000000 1f:05 286 /bin/iptables

0003d000-00041000 rwx0000-4001d000 r-xp 00000000 1f:05 118 /lib/ld-2.8.so

4001d000-4001f000 rwxp 4001d000 1f:05 118

40024000-40025000 r-xp 0001c000 1f:05 118 /lib/ld-2.8.so

40025000-40026000 rwxp 0001d000 1f:05 118 /lib/ld-2.8.so

40026000-400ca000 r-xp 00000000 1f:05 126 /lib/libm-2.8.so

400ca000-400d1000 ---p 000a4000 1f:05 126 /lib/libm-2.8.so

400d1000-400d2000 r-xp 000a3000 1f:05 126 /lib/libm-2.8.so

400d2000-400d3000 rwxp 000a4000 1f:05 126 /lib/libm-2.8.so

400d3000-401ee000 r-xp 00000000 1f:05 151 /lib/libc-2.8.so

401ee000-401f6000 ---p 0011b000 1f:05 151 /lib/libc-2.8.so

401f6000-401f8000 r-xp 0011b000 1f:05 151 /lib/libc-2.8.so

401f8000-401f9000 rwxp 0011d000 1f:05 151 /lib/libc-2.8.so

401f9000-401fc000 rwxp 401f9000 1f:05 151

bec1c000-bec1e000 rw-p beffe000 1f:05 151

Segmentation fault


Sorry for posting such long dumps, but i think thats how you can get
whole picture of the issue.

Thanks...

On 12/13/12, Greg Ungerer <[email protected]> wrote:
> Hi Arshan,
>
> On 12/13/2012 12:11 AM, Arshan Awais wrote:
>> I have tried to compile the kernel by disabling the MMU, but it gives
>> following errors during compilation:
>
> No, you don't want to do that. Having the MMU enabled is fine in
> this case.
>
> I would guess from your original dump that the code is most
> likely executing code in uClibc (I assume that is what you are
> using if you are building with the uClinux-dist).
>
> Try this from the command line of your AT91SAM9X platform:
>
>      cat /proc/self/maps
>
> I expect you will see something like:
>
> 00008000-00085000 r-xp 00000000 1f:02 1141       /bin/sh
> 0008d000-00092000 rw-p 0007d000 1f:02 1141       /bin/sh
> 00092000-0009e000 rwxp 00092000 00:00 0          [heap]
> 40000000-40005000 r-xp 00000000 1f:02 1286522    /lib/ld-uClibc-0.9.29.so
> 40005000-40006000 rw-p 40005000 00:00 0
> 4000c000-4000d000 r--p 00004000 1f:02 1286522    /lib/ld-uClibc-0.9.29.so
> 4000d000-4000e000 rw-p 00005000 1f:02 1286522    /lib/ld-uClibc-0.9.29.so
> 4000e000-4005b000 r-xp 00000000 1f:02 1287024    /lib/libuClibc-0.9.29.so
> 4005b000-40062000 ---p 4005b000 00:00 0
> 40062000-40063000 r--p 0004c000 1f:02 1287024    /lib/libuClibc-0.9.29.so
> 40063000-40064000 rw-p 0004d000 1f:02 1287024    /lib/libuClibc-0.9.29.so
> 40064000-40067000 rw-p 40064000 00:00 0
> bedce000-bedd0000 rwxp beffe000 00:00 0          [stack]
>
>
> Compare what you find with your dump addresses.
>
> Regards
> Greg
>
>
>> In file included from arch/arm/mm/proc-arm926.S:36:
>> arch/arm/mm/proc-macros.S:81:2: error: #error PTE shared bit mismatch
>> arch/arm/mm/proc-macros.S:84:2: error: #error PTE bufferable bit mismatch
>> arch/arm/mm/proc-macros.S:87:2: error: #error PTE cacheable bit mismatch
>>
>> I am a bit confused about disabling the MMU because AT91SAM9X has MMU
>> support...can u make me clear about that?
>>
>> On Wed, Dec 12, 2012 at 2:01 PM, Arshan Awais <[email protected]>
>> wrote:
>>> Thanks for reply Greg!
>>>
>>> No, the MMU is enabled in the kernel configuration.
>>>
>>> On Tue, Dec 11, 2012 at 6:51 AM, Greg Ungerer
>>> <[email protected]> wrote:
>>>> Hi Arshan,
>>>>
>>>>
>>>> On 12/04/2012 03:32 PM, Arshan Awais wrote:
>>>>>
>>>>> hi,
>>>>> i m having an issue when i run iptables on AT91SAM9X in uClinux. I get
>>>>> following messages when i run iptables command:
>>>>>
>>>>> # iptables -v
>>>>> pgd = c0474000
>>>>> [ffff198c] *pgd=203f0031, *pte=00000000, *ppte=00000000
>>>>>
>>>>> Pid: 372, comm: iptables
>>>>> CPU: 0 Not tainted (2.6.30.4-uc0 #195)
>>>>> PC is at 0x401446c4
>>>>
>>>>
>>>> You need to figure out where this address is.
>>>>
>>>> Are you truly running with MMU disabled?
>>>> You will pretty easily be able to tell from your kernel .config.
>>>>
>>>> Regards
>>>> Greg
>>>>
>>>>
>>>>> LR is at 0x9ad0
>>>>> pc : [<401446c4>] lr : [<00009ad0>] psr: 60000010
>>>>> sp : bef16d50 ip : 401446c0 fp : 00000000
>>>>> r10: 40025000 r9 : 00000000 r8 : 00000000
>>>>> r7 : 00000002 r6 : bef16eb4 r5 : bef16f8f r4 : ffff198c
>>>>> r3 : ffff198c r2 : 00000000 r1 : ffff198c r0 : ffff198c
>>>>> Flags: nZCv IRQs on FIQs on Mode USER_32 ISA ARM Segment user
>>>>> Control: 0005317f Table: 20474000 DAC: 00000015
>>>>> [<c00282c4>] (show_regs+0x0/0x50) from [<c002cd64>]
>>>>> (__do_user_fault+0x5c/0xa4)
>>>>> r5:ffff198c r4:c1c5b9c0
>>>>> [<c002cd08>] (__do_user_fault+0x0/0xa4) from [<c002d020>]
>>>>> (do_page_fault+0x1f8/0x230)
>>>>> r7:c182a214 r6:c1c5b9c0 r5:000000o_Dat0026d40>]
>>>>> (ret_from_exception+0x0/0x10)
>>>>> Exception sto 0xc12f5ff8)
>>>>> 5fa0: ffff198c ffff198c 00000000 ffff198c
>>>>> 5fc0: ffff198c bef16f8f bef16eb4 00000002 00000000 00000000 40025000
>>>>> 00000000
>>>>> 5fe0: 401446c0 bef16d50 00009ad0 401446c4 60000010 ffffffff
>>>>> Segmentation fault
>>>>>
>>>>> Kindly help me solving the issue...
>>>>> _______________________________________________
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>>>>
>>
>
>
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