System was restarted by bus error at PC 0x1, address 0x0

[NetEng12249872]

Hello,

One of our voice routers rebooted and shows the following Bus Error, can anyone tell me what exactly it is?

VoiceRouter#sh context

System was restarted by bus error at PC 0x1, address 0x0 at 10:26:25 UTC Sun Jan 14 2018
2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)XZ, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Compiled Fri 11-Apr-08 17:50 by prod_rel_team
Image text-base: 0x40077A58, data-base: 0x43D2B490

Stack trace from system failure:
FP: 0x4963F778, RA: 0x1

Fault History Buffer:
2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)XZ, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Compiled Fri 11-Apr-08 17:50 by prod_rel_team
Signal = 10, Code = 0x10, Uptime 1y51w
$0 : 00000000, AT : 468B0000, v0 : 00000004, v1 : FFFFFFFF
a0 : 41433038, a1 : 00000004, a2 : 46B2BB7C, a3 : 4963F755
t0 : 46B2BC51, t1 : 0FD14DFC, t2 : 00000001, t3 : 00000000
t4 : 00000000, t5 : 3F5EF44A, t6 : CFFFFFFF, t7 : CFFF0000
s0 : 41DB2A98, s1 : 41DB2A8C, s2 : 31373737, s3 : 46620000
s4 : 46620000, s5 : 46B2E4AC, s6 : 00000002, s7 : 00000000
t8 : 0000004D, t9 : 47B98124, k0 : 3040A801, k1 : A000F000
gp : 468B7350, sp : 4963F778, s8 : 00000002, ra : 00000001
EPC : 00000001, SREG : 3400FF03, Cause : 00000010
Error EPC : 01100002, BadVaddr : 00000001
DATA_START : 0x43D2B490

[NetEng12249872]

VoiceRouter#sh region
Region Manager:

Start End Size(b) Class Media Name
0x0F200000 0x0FFFFFFF 14680064 Iomem R/W iomem:(uncached_iomem_region)
0x3F200000 0x3FFFFFFF 14680064 Iomem R/W iomem
0x40000000 0x4F1FFFFF 253755392 Local R/W main
0x4000F000 0x43D1FFFF 64032768 IText R/O main:text
0x43D23CB0 0x468A850F 45631584 IData R/W main:data
0x468A8510 0x4727622F 10280224 IBss R/W main:bss
0x47276230 0x4F1FFFFF 133733840 Local R/W main:heap
0x80000000 0x8F1FFFFF 253755392 Local R/W main:(main_k0)
0xA0000000 0xAF1FFFFF 253755392 Local R/W main:(main_k1)


Free Region Manager:

Start End Size(b) Class Media Name

[Leo Laohoo]

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@NetEng12249872 wrote:
12.4(15)XZ

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Wow.  I've never seen an IOS version like this before.  Not an "XZ".  

My recommendation is to upgrade the IOS of the router first.  

[NetEng12249872]

Any suggested version?