CISCO ROUTER 2951 WITH A LOOP "READOLY ROMMON INITIALIZED"

[Donaire]

Greatings everyone,

I have a router that suddently all configs seems to be erased, 

Its on a loop and i cant issue any command on the terminal,

It worked as a SIP-Gateways as well, 

Some of the current output: 

=== Flushing messages () ===

Buffered messages:
Queued messages:
*Jan 2 00:00:06.411: %SYS-3-LOGGER_FLUSHING: System pausing to ensure console debugging output.

*Jan 2 00:00:02.843: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2951 Next reboot level = ipbasek9 and License = ipbasek9
*Jan 2 00:00:02.979: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2951 Next reboot level = uck9 and License = uck9
*Jan 2 00:00:04.047: %MAINBOARD-4-ECC_SINGLE: A corrected single bit error has occurred in DRAM at location 0x432614
*** System received a SegV exception ***
signal= 0xb, code= 0x300, context= 0x118cf110
PC = 0x436caf0, Vector = 0x300, SP = 0x1856830

System Bootstrap, Version 15.0(1r)M16, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2012 by cisco Systems, Inc.

Total memory size = 512 MB - DIMM0 = 512 MB, DIMM1 = 0 MB
CISCO2951/K9 platform with 524288 Kbytes of main memory
Main memory is configured to 72/0(dimm 0/1) bit mode with ECC enabled

Readonly ROMMON initialized
program load complete, entry point: 0x4000000, size: 0x18fa0
program load complete, entry point: 0x4000000, size: 0x18fa0

[Nithin Eluvathingal]

I assume its on rommon mode. is this router displaying  rommon 1 >

[Donaire]

No its not showing, I press enter and no effec. I cant issue any command!
It keeps rebooting. 

It keeps in the following loop:

IOS Image Load Test
___________________
Digitally Signed Release Software
program load complete, entry point: 0x4000000, size: 0x55d90a8
Self decompressing the image : ##################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################### [OK]
*** No sreloc section
Smart Init is enabled
smart init is sizing iomem
TYPE MEMORY_REQ
Onboard devices &
buffer pools 0x0230F000
-----------------------------------------------
TOTAL: 0x0230F000

Rounded IOMEM up to: 36Mb.
Using 7 percent iomem. [36Mb/512Mb]

Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706

Cisco IOS Software, C2951 Software (C2951-UNIVERSALK9-M), Version 15.2(4)M4, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Thu 20-Jun-13 13:30 by prod_rel_team

: Unexpected exception to CPU: vector 300, PC = 0x436CAF0 , LR = 0x436CAEC

-Traceback= 0x436CAF0z 0x400DCF4z 0x4314A58z 0x4314A58z 0x400DDB0z 0x43266D0z 0x43266D0z 0x581F3ECz 0x581F7D8z 0x4DD986Cz 0x4DBF6D8z

M8500 CPU Register Context:
PC = 0x0436CAF0 MSR = 0x02029200 CR = 0x24008042 LR = 0x0436CAEC
CTR = 0x04314474 XER = 0x00000000 DEAR = 0x04326140 PVR = 0x80210030
DEC = 0x0000ACD2 TBU = 0x00000000 TBL = 0x209097E4
DBCR0= 0x41000000 DBCR1= 0x00000000 DBCR2= 0x00000000
IAC1 = 0x00000000 IAC2 = 0x00000000 DAC2 = 0x00000000 DAC2 = 0x00000000
R0 = 0x2F80001D R1 = 0x01856830 R2 = 0xDAFCF91F R3 = 0x11A177C0
R4 = 0x0C553AE8 R5 = 0x00000000 R6 = 0x05906CF8 R7 = 0x00000000
R8 = 0x00000002 R9 = 0x10850000 R10 = 0x01856738 R11 = 0x00000000
R12 = 0x48008082 R13 = 0x5A4F4268 R14 = 0x0581F75C R15 = 0x00000000
R16 = 0x00000000 R17 = 0x2090891D R18 = 0x0D880000 R19 = 0x10040000
R20 = 0x11D10000 R21 = 0x11D10000 R22 = 0x10000000 R23 = 0x11D10000
R24 = 0x11710000 R25 = 0x00000000 R26 = 0x117376C4 R27 = 0x00000004
R28 = 0x00000002 R29 = 0x00000000 R30 = 0x04326140 R31 = 0x04326140
TEXT_START : 0x040001B0
DATA_START : 0x0C000000Invalid path _20060102-000004-UTC
No fault history 0▒

=== Flushing messages () ===

Buffered messages:
Queued messages:
*Jan 2 00:00:06.411: %SYS-3-LOGGER_FLUSHING: System pausing to ensure console debugging output.

*Jan 2 00:00:02.843: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2951 Next reboot level = ipbasek9 and License = ipbasek9
*Jan 2 00:00:02.979: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2951 Next reboot level = uck9 and License = uck9
*Jan 2 00:00:04.047: %MAINBOARD-4-ECC_SINGLE: A corrected single bit error has occurred in DRAM at location 0x432614
*** System received a SegV exception ***
signal= 0xb, code= 0x300, context= 0x118cf110
PC = 0x436caf0, Vector = 0x300, SP = 0x1856830

System Bootstrap, Version 15.0(1r)M16, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2012 by cisco Systems, Inc.

Total memory size = 512 MB - DIMM0 = 512 MB, DIMM1 = 0 MB
CISCO2951/K9 platform with 524288 Kbytes of main memory
Main memory is configured to 72/0(dimm 0/1) bit mode with ECC enabled

Readonly ROMMON initialized
program load complete, entry point: 0x4000000, size: 0x18fa0
program load complete, entry point: 0x4000000, size: 0x18fa0

[Maren Mahoney]

The error:  *** System received a SegV exception ***  indicates you may have a software fault. If you upgraded to a new IOS when this happened, that is probably the issue and other IOS change will probably be necessary. If you did not, you may have a hardware fault (in the RAM for instance) that is generating a software fault. Take a look at this doc:

SegV Exceptions 

Edit: Looking again, the %MAINBOARD-4-ECC_SINGLE: A corrected single bit error has occurred in DRAM at location 0x432614 indicates a hardware problem. Contact TAC. If it is not the RAM (which you can replace) it may be that the entire unit has a fault.

Maren

[Maren Mahoney · Accepted solution]

Try popping out the DRAM and cleaning the contacts. -- Maren

[Donaire]

Hi @Maren Mahoney 
I have not upgraded the ios, so it might be as you said. The RAM might be faulty,

I will do as you said and i post a feedback

Thank you @Maren Mahoney 

[Nithin Eluvathingal]

If cleaning the Dram, doesn't resolve your issue , i suggest to raise RMA if you have valid smartnet.