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871: CPUvector 300, PC = 0x811CD7FC, LR = 0x8087

stephanhd
Level 1
Level 1

Hi all,

(IOS : C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(4)T7, RELEASE SOFTWARE (fc1))

after running the router for month w/o any interruption, the device failed today /few times with an :

Unexpected exception to CPUvector 300, PC = 0x811CD7FC, LR = 0x8087

0BF4

-Traceback= 0x811CD7FC 0x80870BF4 0x80874D90 0x80875794 0x8087593C 0x8034B0EC 0x8034E398

CPU Register Context:

MSR = 0x00009032 CR = 0x88082048 CTR = 0x80870B90 XER = 0x00000000

R0 = 0x00000021 R1 = 0x838C8D88 R2 = 0xFFF4FFF4 R3 = 0x82977218

R4 = 0x8352FF18 R5 = 0x83DBFE20 R6 = 0x00000000 R7 = 0x00000008

R8 = 0x838C8EB4 R9 = 0x83324368 R10 = 0x00000032 R11 = 0x0000000A

R12 = 0x22082048 R13 = 0x87FFFF0C R14 = 0x808757E4 R15 = 0x00000000

R16 = 0x00000000 R17 = 0x00000000 R18 = 0x00000000 R19 = 0x00000000

R20 = 0x00000000 R21 = 0x00000000 R22 = 0x00000000 R23 = 0x00000000

R24 = 0x827F0000 R25 = 0x827F0000 R26 = 0x82850000 R27 = 0x00000000

R28 = 0x00000003 R29 = 0x8352FF18 R30 = 0x83DBFE20 R31 = 0x82977218

Writing crashinfo to flash:crashinfo_20070817-161819

On the first fail, I reloaded the device and- bang- the flash: wasn't readable anymore !

In ROMMOM I got some strange I/O Errors on flash device. Finally i performed a format flash: successfully and tftpdnld'ed the IOS back to the device.

On first restart, I got again an excpection (same as before) but now the crashfile (I can submit infos from the crashfile - if needed) was written to flash w/o problems and the router is now up and running....

Question:

Is there ANY indicator for a h/w problem ? (I think yes, cause the config was unchanged since july and the router is running non-stop since december or so.)

Will dealer accept an RMA on this issue ?

Is this a (more or less) common problem with 871 ?

Any other out there with this symtom ?

Any indicator in the dump about the cause ? (I have NO experience in analysing cisco dumps)

Best and thanks,

Stephan

5 Replies 5

paolo bevilacqua
Hall of Fame
Hall of Fame

Hi Stephan,

at first look seems HW related. But please attach crashinfo.

Today was very hot, is your 871 well ventilated ?

Hi P. :)

the device is located in germany - but it was hot today too... nevertheless, the device is located in a small datacenter with equal temp all time.

 

Attached the crashinfo...

 

THANKS, Stephan

 

 

 

Hi,

Seems like something related to DHCP but, could be erratic HW also. Delete crashinfo and check if it happens again:

flashfs_fsck

tw_timer_start

dhcpc_new_state

dhcpc_process_inpak

dhcpc_queue_event

dhcpc_process

ppc_process_dispatch

process_execute

...already done that... fired a bunch of "release dhcp .." renew dhcp..:" and "fsck flash:".... but the device is stable - hmm.

I will try to stress the device a little bit (it's connected to a 10MBit/s uplink) and observe.

BUT:can I still trust the device ?

Best,S.

Honestly I wouldn't know.

What I know is if under maintenance contract with cisco, they would replace it no question asked.

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