[c-nsp] 2960-X Reboot Loop

Hunter Fuller hf0002 at uah.edu
Tue Nov 8 10:21:32 EST 2016


It's happening in the loader too, so it can't just be an IOS bug. Unless
you just updated the boot loader, I would bet on hardware failure.

On Tuesday, November 8, 2016, Christopher Werny <cwerny at ernw.de> wrote:

> Hello,
>
> may I query the wisdom of this list for feedback regarding an issue we have
> with a 2960-X
>
> Since today, our 2960-X is in a rebooting loop and I see the following
> error
> messages on the local console during the boot process:
>
> Initializing Flash...
> mifs[5]: 12 files,Err: Interrupt: Machine check (0x200): Data access error:
>     PC: 0x1f19f8bc, MSR: 0x00021000, ESR: 0x00000000, MCSR: 0x84800000
> (Bailed out.)
> Err: Interrupt: Machine check (0x200): Data access error:
>     PC: 0x1f19f8bc, MSR: 0x00021000, ESR: 0x00000000, MCSR: 0x84800000
> (Bailed out.)
> Err: Interrupt: Machine check (0x200): Data access error:
>     PC: 0x1f19f8bc, MSR: 0x00021000, ESR: 0x00000000, MCSR: 0x84800000
> (Bailed out.)
> Err: Interrupt: Machine check (0x200): Data access error:
>     PC: 0x1f19f8bc, MSR: 0x00021000, ESR: 0x00000000, MCSR: 0x84800000
> (Bailed out.)
> Err: Interrupt: Machine check (0x200): Data access error:
>     PC: 0x1f19f8bc, MSR: 0x00021000, ESR: 0x00000000, MCSR: 0x84800000
> (Bailed out.)
> Err: Interrupt: Machine check (0x200): Data access error:
>
>     PC: 0x1f19f8bc, MSR: 0x00021000, ESR: 0x00000000, MCSR: 0x84800000
>
> (Bailed out.)
>
>
>
> Panic: Too many exceptions: Turn off Machine Check interrupt!!
>
>
>  1 directories
> mifs[5]: Total bytes     :    1806336
> mifs[5]: Bytes used      :     834560
> mifs[5]: Bytes available :     971776
> mifs[5]: mifs fsck took 2 seconds.
> mifs[6]: 1 files, 1 directories
> mifs[6]: Total bytes     :    3870720
> mifs[6]: Bytes used      :     971264
> mifs[6]: Bytes available :    2899456
> mifs[6]: mifs fsck took 1 seconds.
> mifs[7]: 5 files, 1 directories
> mifs[7]: Total bytes     :     258048
> mifs[7]: Bytes used      :       8192
> mifs[7]: Bytes available :     249856
> mifs[7]: mifs fsck took 0 seconds.
> mifs[8]: 5 files, 1 directories
> mifs[8]: Total bytes     :     258048
> mifs[8]: Bytes used      :       8192
> mifs[8]: Bytes available :     249856
> mifs[8]: mifs fsck took 0 seconds.
> mifs[9]: 9 files, 2 directories
> mifs[9]: Total bytes     :  122185728
> mifs[9]: Bytes used      :   48398848
> mifs[9]: Bytes available :   73786880
> mifs[9]: mifs fsck took 45 seconds.
> ...done Initializing Flash.
> Loading "flash:c2960x-universalk9-mz.152-4.E1.bin"...Verifying image
> flash:c2960x-universalk9-mz.152-4.E1.bin..................
> ..................
> ............n
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@
> @@@@@@
> File "flash:c2960x-universalk9-mz.152-4.E1.bin" uncompressed and
> installed,
> entry point: 0x3000
> executing...
>
>  : Unexpected exception to CPUvector 200, PC = 36A0484
> -Traceback= 0x36A0484z
>
>
> === Flushing messages () ===
>
> Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version
> 15.2(4)E1, RELEASE SOFTWARE (fc2)
> Technical Support: http://www.cisco.com/techsupport
> Copyright (c) 1986-2016 by Cisco Systems, Inc.
> Compiled Thu 28-Jan-16 15:56 by prod_rel_team
>
> Machine Check Exception (0x0200)!
> ESR: 0x00000000
> SRR0: 0x036A0484 SRR1: 0x00029200 SRR2: 0x02F35B70 SRR3: 0x00028000
> MCSR: 0x84800000
> L2MCSR: 0x00000000
>
> CPU Register Context:
> Vector = 0x00000200  PC = 0x036A0484  MSR = 0x00029200  CR = 0x00000000
> LR = 0x0369C1A4  CTR = 0x0369421C  XER = 0xE000007E
> R0 = 0x00000000  R1 = 0x0779DD88  R2 = 0x00000000  R3 = 0x00000000
> R4 = 0x036A0484  R5 = 0x00029200  R6 = 0xBEEFCAFE  R7 = 0xBEEFCAFE
> R8 = 0x00400080  R9 = 0x00000001  R10 = 0x07791160  R11 = 0x07791150
> R12 = 0x33003033  R13 = 0x1F1828CC  R14 = 0x02918E6C  R15 = 0x00000000
> R16 = 0x00000000  R17 = 0x00000000  R18 = 0x00000000  R19 = 0x00000000
> R20 = 0x00000000  R21 = 0x00000000  R22 = 0x00000000  R23 = 0x00000000
> R24 = 0x00000000  R25 = 0x00000000  R26 = 0x00000000  R27 = 0x00000000
> R28 = 0x00000000  R29 = 0x00000000  R30 = 0x00000000  R31 = 0x00000000
>
> Stack trace:
> PC = 0x036A0484, SP = 0x0779DD88
> Frame 00: SP = 0x00000000    PC = 0x02951BEC
>
> The only thing I was able to find was a post on the support forum with the
> same issue, but with no resolution. I wasn't able to find bug id that would
> indicate an IOS bug (but my search skills may have failed me).
>
> https://supportforums.cisco.com/discussion/13092381/cisco-
> switch-2960-x-seri
> es-error
>
> I need to check with TAC, but from your point of view, does it look more
> like a hardware failure or a potential IOS bug?
>
> Thanks in advance for your feedback
>
> Cheers,
> Christopher
>
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-- 

--
Hunter Fuller
Network Engineer
VBRH Annex B-1
+1 256 824 5331

Office of Information Technology
The University of Alabama in Huntsville
Systems and Infrastructure


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