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Cisco IOS ALIGN-1-FATAL: Illegal access to a low address in 12.0(27)S5 Pingsta Validated

Bug ID:

CSCin78176

Resolved In:

12.0(32)S, 12.0(30)SZ9

Symptom:

The router will crash with a bus error exception and the following may be logged in the crashinfo file (see attached for complete capture) ;

%ALIGN-1-FATAL: Illegal access to a low address
 addr=0x100, pc=0x602A264C, ra=0x602A361C, sp=0x625CC148


Unexpected exception, CPU signal 10, PC = 0x602A264C


-Traceback= 602A264C 602A361C 6046930C 6046BBA0 6046BC94 6046B758 6046B908 60471B14 60471D0C 603A5FEC 6019AFF0 6019B490 60198BF4 60199604 604113C8 604113B4
$0 : 00000000, AT : 61A10000, v0 : 00000000, v1 : 00000002
a0 : 00000100, a1 : 00000000, a2 : 6554AC00, a3 : 72FAE808
t0 : 00000000, t1 : 00000002, t2 : FFFFFFFC, t3 : 00000004
t4 : 6554BD38, t5 : 6554BD34, t6 : 6554BD30, t7 : 6554BD2C
s0 : 71806820, s1 : 6554AC00, s2 : 72FAE808, s3 : 63610D50
s4 : 00000000, s5 : 00000000, s6 : 00000000, s7 : 00000000
t8 : 625CC1E4, t9 : 00000000, k0 : 622125F0, k1 : 60445B6C
gp : 61A181A0, sp : 625CC148, s8 : 00000000, ra : 602A361C
EPC : 602A264C, ErrorEPC : DEFAEFED, SREG : 3400FF03
Cause 8000000C (Code 0x3): TLB (store) exception


=== Start of Crashinfo Collection (19:52:30 UTC Wed Feb 3 2010) ===

For image:
Cisco Internetwork Operating System Software
IOS (tm) 10000 Software (C10K-K4P10-M), Version 12.0(27)S5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Mon 09-May-05 11:29 by kellythw


========== Stack Trace========

-Traceback= 602A264C 602A361C 6046930C 6046BBA0 6046BC94 6046B758 6046B908 60471B14 60471D0C 603A5FEC 6019AFF0 6019B490 60198BF4 60199604 604113C8 604113B4

========= Context ======================

10000 Software (C10K-K4P10-M), Version 12.0(27)S5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Compiled Mon 09-May-05 11:29 by kellythw
Signal = 10, Code = 0x8000000C, Uptime 7w0d
$0 : 00000000, AT : 61A10000, v0 : 00000000, v1 : 00000002
a0 : 00000100, a1 : 00000000, a2 : 6554AC00, a3 : 72FAE808
t0 : 00000000, t1 : 00000002, t2 : FFFFFFFC, t3 : 00000004
t4 : 6554BD38, t5 : 6554BD34, t6 : 6554BD30, t7 : 6554BD2C
s0 : 71806820, s1 : 6554AC00, s2 : 72FAE808, s3 : 63610D50
s4 : 00000000, s5 : 00000000, s6 : 00000000, s7 : 00000000
t8 : 625CC1E4, t9 : 00000000, k0 : 622125F0, k1 : 60445B6C
gp : 61A181A0, sp : 625CC148, s8 : 00000000, ra : 602A361C
EPC : 602A264C, SREG : 3400FF03, Cause : 8000000C

Conditions:

None.

This crash occurred on the standby PRE-1 of a Cisco ESR 10008 running 12.0(27)S5. From the crashinfo file it would seem this is not patform dependent.

 

This crash will only occur on a Cisco IOS device that is configured for Quality of service and per-packet load-balancing - PPLB.

Workaround:

None

Solution:

This crash occurred because IOS attempted to write to an invalid address - 0x100. This is a software bug. This post will be updated when Cisco provides details of the bug fix.

Upgrade to 12.0(32)S, 12.0(30)SZ9 and later Cisco IOS releases to get the fix to this bug.

Attachments:

Type: Bug - Archive ID: 1.15531 - 446 Views - Last Updated: February 18, 2010 00:17:35
Tags: Cisco Software Crash bus error ALIGN-1-FATAL bug ios esr 10008 pre-1