[#4153] exception of accessing null pointer is not well handled in kernel with SMP patch

Submitted By: Vivi Li

Open Date

2008-06-06 04:18:12 Close Date

2008-06-16 08:13:39

Priority:

Medium High Assignee:

Graf Yang

Status:

Closed Fixed In Release:

N/A

Found In Release:

N/A Release:

Category:

N/A Board:

N/A

Processor:

N/A Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

08r1.5-11

App binary format:

N/A

Summary: exception of accessing null pointer is not well handled in kernel with SMP patch

Details:

For kernel patched with SMP, the exception of access null pointer is not well handled.

root:/> ./null_point

Caught Unhandled Exception, code = 00000000^M

...

For kernel without SMP patch, it looks as bellow:

./null_point^M

NULL pointer access^M

Deferred Exception context^M

CURRENT PROCESS:^M

COMM=null_point PID=112^M

TEXT = 0x003b8040-0x003bb040 DATA = 0x003bb044-0x003bb614^M

BSS = 0x003bb614-0x003bb864 USER-STACK = 0x003bcf7c^M

return address: [0x003b814a]; contents of:^M

0x003b8120: 0000 0c42 1805 3041 e801 0000 0052 e801 ^M

0x003b8130: 0000 0010 e800 0003 e801 0000 0010 0000 ^M

0x003b8140: e800 0004 6000 bbf0 b9fa [9111] e140 003b ^M

0x003b8150: e100 b064 e300 0006 6000 e801 0000 0010 ^M

SEQUENCER STATUS: Not tainted^M

SEQSTAT: 00062027 IPEND: 0030 SYSCFG: 0006^M

HWERRCAUSE: 0x18^M

EXCAUSE : 0x27^M

RETE: <0x00000000> /* Maybe null pointer? */^M

RETN: <0x004ac000> /* unknown address */^M

RETX: <0x00000480> /* Maybe fixed code section */^M

RETS: <0x003b9204> [ null_point + 0x11c4 ]^M

PC : <0x003b814a> [ null_point + 0x10a ]^M

DCPLB_FAULT_ADDR: <0x00000000> /* Maybe null pointer? */^M

ICPLB_FAULT_ADDR: <0x003b814a> [ null_point + 0x10a ]^M

PROCESSOR STATE:^M

R0 : 00000000 R1 : 003bcf80 R2 : 003bcf88 R3 : 0000002f^M

R4 : 003b8140 R5 : 00000001 R6 : 003bb83c R7 : 00000000^M

P0 : 003bcef5 P1 : 003bb83c P2 : 00000000 P3 : 003bcf80^M

P4 : 003bb60c P5 : 003bb044 FP : 003bcf28 SP : 004abf24^M

LB0: 003b8e11 LT0: 003b8e10 LC0: 00000000^M

LB1: 003118c9 LT1: 003118c2 LC1: 00000000^M

B0 : 00000000 L0 : 00000000 M0 : 00000000 I0 : 003bce95^M

B1 : 00000000 L1 : 00000000 M1 : 00000000 I1 : 003fc004^M

B2 : 00000000 L2 : 00000000 M2 : 00000000 I2 : 00000000^M

B3 : 00000000 L3 : 00000000 M3 : 00000000 I3 : 00000000^M

A0.w: 00000000 A0.x: 00000000 A1.w: 00000000 A1.x: 00000000^M

USP : 003bcf18 ASTAT: 02003025^M

Hardware Trace

...

Follow-ups

--- Vivi Li 2008-06-16 08:13:39

OK now. Close it. Thanks!

Files

Changes

Commits

Dependencies

Duplicates

Associations