Windows/Linux hang issue

Sunday 15 April 2018

Windows/Linux hang issue - BSOD

DELL Latitude 3540 with Windows 7 & Ubuntu linux, dual boot.

I see below error in windows 7 system logs frequently. Windows/Linux gets hanged 5 minutes after switching/working on laptop.

Interesting observation is, if Windows/Linux OS is working under high bandwidth wifi coverage, then windows/Linux continue working properly. Under low bandwidth wifi coverage Windows/Linux hang within 5 minutes.

That means, Ubuntu/Windows7 works for properly(for ever), until, until some application/browser connects to Internet thru low bandwidth wifi.

memtest86+ tool shows all tests PASS and amidst testing CPU temp is 50°C to 53°C

In ubuntu, wifi details taken,

mohet01@mohet01-ubuntu:~$lspci -knn | grep Net 02:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01) Subsystem: Dell QCA9565 / AR9565 Wireless Network Adapter [1028:020c]

OS hangs consistently and need to restart within 5 minutes.

Received core dump in windows 7(once) with blue screen(shown below)

/**************************************************/

Problem signature:
  Problem Event Name:   BlueScreen
  OS Version:   6.1.7601.2.1.0.768.3
  Locale ID:    4105

Additional information about the problem:
  BCCode:   124
  BCP1: 0000000000000000
  BCP2: FFFFFA8007067028
  BCP3: 00000000BE000000
  BCP4: 0000000000800400
  OS Version:   6_1_7601
  Service Pack: 1_0
  Product:  768_1

Files that help describe the problem:
  C:\Windows\Minidump\031717-25412-01.dmp
  C:\Users\....\AppData\Local\Temp\WER-78016-0.sysdata.xml

/**************************************************/

Log details in XML format:

- 
- 
   
  18 
  0 
  2 
  0 
  0 
  0x8000000000000000 
   
  14505 
   
   
  System 
  mohet01-w7 
   
  
- 
  3 
  0 
  6 
  0xae0000000040110a 
  0xffb07540 
  0x238a0000086 
  9 
  2 
  256 
  0 
  256 
  2 
  256 
  256 
  256 
  928 
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

Process id 1796,

All levels of DELL support for this laptop is expired in 2016.

I ran below diagnostics on Intel processor of this laptop, looks fine.

Is it something to do with hardware issue?

Is it something to do with WIFI driver issue in both(Linux/Windows7) that triggers this problem?

Answer

Event with ID 18 is fatal error. This is how Event 18 is declared in Windows:

An cache hierarchy error could be an issue with the L1, L2 cache of you CPU. Run CPU stress tool that access cpu cache very heavily. Maybe it reports any errors. I think you need to replace the CPU, like this user who sees the same message.

The 0x124 dump shows L2 Cache issues:

===============================================================================
Common Platform Error Record @ fffffa8006d0d8f8
-------------------------------------------------------------------------------
Record Id     : 01d2a2c0cacd2425
Severity      : Fatal (1)
Length        : 928
Creator       : Microsoft
Notify Type   : Machine Check Exception
Timestamp     : 3/22/2017 4:00:10 (UTC)
Flags         : 0x00000002 PreviousError

===============================================================================
Section 0     : Processor Generic
-------------------------------------------------------------------------------
Descriptor    @ fffffa8006d0d978
Section       @ fffffa8006d0da50
Offset        : 344
Length        : 192
Flags         : 0x00000001 Primary
Severity      : Fatal

Proc. Type    : x86/x64
Instr. Set    : x64
Error Type    : Cache error
Operation     : Generic
Flags         : 0x00
Level         : 2
CPU Version   : 0x0000000000040651
Processor ID  : 0x0000000000000000

===============================================================================
Section 1     : x86/x64 Processor Specific
-------------------------------------------------------------------------------
Descriptor    @ fffffa8006d0d9c0
Section       @ fffffa8006d0db10
Offset        : 536
Length        : 128
Flags         : 0x00000000
Severity      : Fatal

Local APIC Id : 0x0000000000000000
CPU Id        : 51 06 04 00 00 08 10 00 - bf fb da 7f ff fb eb bf
                00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00
                00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00

Proc. Info 0  @ fffffa8006d0db10

===============================================================================
Section 2     : x86/x64 MCA
-------------------------------------------------------------------------------
Descriptor    @ fffffa8006d0da08
Section       @ fffffa8006d0db90
Offset        : 664
Length        : 264
Flags         : 0x00000000
Severity      : Fatal

Error         : GCACHEL2_ERR_ERR (Proc 0 Bank 6)
  Status      : 0xae0000000040110a
  Address     : 0x00000000ffb07540
  Misc.       : 0x000001f8a0000086

So sometimes the code uses the L2 cache and crashes and sometimes not. The dump only shows generic error, so I have no real idea what is wrong.

Buy the same CPU again on ebay and replace it.

Notes

Sunday 15 April 2018