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why does the switch 3550 restart?

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Hi:

  The swtich 3550 restarted,system hint:System returned to ROM by error - Unassigned Exception (0x213E364)!, PC 0x90B5C0.Here is the information about detailed failure,please help me to analyze it.

  ------------------ show stacks ------------------


Minimum process stacks:
Free/Size   Name
4712/6000   vegas_flash init
3536/6000   SaveCrashBuffer
5768/6000   CDP BLOB
8744/9000   IP IRDP
8536/9000   IP Background
5728/6000   vqpc_shim_create_addr_tbl
5400/6000   SPAN Subsystem
11544/12000  Router Init
7000/12000  Init
8760/9000   cdp init process
5560/6000   RADIUS INITCONFIG
35000/36000  TCP Command
4464/6000   Vegas CrashBuffer
2600/3000   Rom Random Update Process

Interrupt level stacks:
Level    Called Unused/Size  Name
  4      318315   8040/9000  CPU NETWORK INTERFACE CHIP
  5        7830   8904/9000  Vegas miami tty xmit hack timer
  6       79703   8936/9000  Clock Timer Vector

Spurious interrupts: 372

System was restarted by error - Unassigned Exception (0x213E364)!, PC 0x90B5C0
C3550 Software (C3550-IPSERVICESK9-M), Version 12.2(25)SEB2, RELEASE SOFTWARE (fc1)
Compiled Wed 08-Jun-05 03:37 by yenanh (current version)
Image text-base: 0x00003000, data-base: 0x00D107EC


Stack trace from system failure:
FP: 0x1DB0CA0, RA: 0x90B5C0
FP: 0x1DB0CB8, RA: 0x0
FP: 0x1DB0CD8, RA: 0x911A40
FP: 0x1DB0CF8, RA: 0x740A28
FP: 0x1DB0D10, RA: 0x740D78
FP: 0x1DB0D28, RA: 0x741150
FP: 0x1DB0D58, RA: 0x741DB8
FP: 0x1DB0D78, RA: 0x742268


***************************************************
******* Information of Last System Crash **********
***************************************************


Using flash:/crashinfo/crashinfo_1.
Cisco IOS Software, C3550 Software (C3550-IPSERVICESK9-M), Version 12.2(25)SEB2, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Wed 08-Jun-05 03:37 by yenanh

Unassigned Exception (0x213E364)!
CPU Register Context:
Vector = 0x0213E364  PC = 0x0090B5C0  MSR = 0x2000B030  CR = 0x22000024
LR = 0x00911A40  CTR = 0x00B47C88  XER = 0x00000000
R0 = 0x00000000  R1 = 0x01DB0CA0  R2 = 0x00000000  R3 = 0xFFFE7FDF
R4 = 0xFFFFFFFF  R5 = 0x01155B78  R6 = 0x01155BC8  R7 = 0x00003030
R8 = 0x0000B030  R9 = 0x0D0D0D0D  R10 = 0x01EC5430  R11 = 0x01EC5AD8
R12 = 0xBC2F7EEC  R13 = 0xFFDFFFFF  R14 = 0x0073BA08  R15 = 0x00000000
R16 = 0x00000000  R17 = 0x00000000  R18 = 0x00000000  R19 = 0x00000000
R20 = 0x00000000  R21 = 0x00000000  R22 = 0x00000000  R23 = 0x00000000
R24 = 0x00000000  R25 = 0x012D0000  R26 = 0x01460000  R27 = 0x00000006
R28 = 0x00000000  R29 = 0x01DB0CC8  R30 = 0x01529B38  R31 = 0x0213E018

Stack trace:
PC = 0x0090B5C0, SP = 0x01DB0CA0
Frame 00: SP = 0x01DB0CB8    PC = 0x00000000
Frame 01: SP = 0x01DB0CD8    PC = 0x00911A40
Frame 02: SP = 0x01DB0CF8    PC = 0x00740A28
Frame 03: SP = 0x01DB0D10    PC = 0x00740D78
Frame 04: SP = 0x01DB0D28    PC = 0x00741150
Frame 05: SP = 0x01DB0D58    PC = 0x00741DB8
Frame 06: SP = 0x01DB0D78    PC = 0x00742268
Frame 07: SP = 0x01DB0DB0    PC = 0x0074A5BC
Frame 08: SP = 0x01DB0DB8    PC = 0x0073B9BC
Frame 09: SP = 0x01DB0DF0    PC = 0x0073BCD4
Frame 10: SP = 0x01DB0DF8    PC = 0x003DE120
Frame 11: SP = 0x00000000    PC = 0x003D8374