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New Member

7206 Unexpected exception s, started after IOS upgrade

We have a 7206 in service. We began having a problem every couple of days where the router would crash and require a power cycle to fix the problem. Some people I've spoken to suggest bad ram but this occured immediately after we upgraded from 7200-is-mz.121-8 to 7200-is-mz.121-13a. Unless the newer image pushed the memory usage up beyond levels it ever had reached before (with months in service), I find that to be rather coincidental.

#show mem

Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)

Processor 61854740 226146496 95805484 130341012 130169452 130173088

I/O F000000 16777216 3495484 13281732 13188856 13269660

I'm attaching the crash information below, does anyone have any thoughts on this?

Thanks for any ideas,


Unexpected exception, CPU signal 10, PC = 0x6055B5A0

$0 : 00000000, AT : 200DD609, v0 : 00000000, v1 : 00000038

a0 : 00000001, a1 : 3D800000, a2 : 00000002, a3 : 00000000

t0 : 6059FC98, t1 : 3400F900, t2 : FFFFFFFD, t3 : EED48571

t4 : 600DD604, t5 : 80000000, t6 : C03B2B93, t7 : 00000201

s0 : 617F2920, s1 : 00000200, s2 : 3D800000, s3 : 00000000

s4 : 00000001, s5 : 00000000, s6 : 61B6C0B0, s7 : 00000000

t8 : 6055A048, t9 : 00000000, k0 : 617EEBC0, k1 : 00000014

gp : 61674A60, sp : 61605958, s8 : 00000000, ra : 60563960

EPC : 6055B5A0, ErrorEPC : 600DD604, SREG : 3400F902

Cause 00004018 (Code 0x6): Instruction Bus Error exception

-Traceback= 6055B5A0 60563960

=== Flushing messages (16:14:00 EDT Mon Oct 13 2003) ===

Buffered messages:

Queued messages:Free space check for bootflash:crashinfo_20031013-201400 failed


-Traceback= 6055B5A0 60563960

*** System received a Bus Error exception ***

signal= 0xa, code= 0x18, context= 0x617f0e04

PC = 0x6055db98, Cause = 0x4420, Status Reg = 0x34008002

  • Other Network Infrastructure Subjects

Re: 7206 Unexpected exception s, started after IOS upgrade

You can probably remove the modules and try to isolate the problem. Also check for minimum recommended RAM, if you suspect it to be an issue.

New Member

Re: 7206 Unexpected exception s, started after IOS upgrade

I wish I could; this is in production and we don't have a spare chassis for this application so taking a module out and waiting a week to see if it dies isn't an option.

Thanks for the suggestion tho'. I'm glad to see people trying to help.