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Windows 7: BSOD on startup, error code:b8

09 Nov 2015   #1

Windows 7 professional x64
BSOD on startup, error code:b8

Computer keep having error on startup over a few weeks. Sometime it works fine but lately it has been restarting and leading me to safe mode option. Please provide me some advice.

My System SpecsSystem Spec
11 Nov 2015   #2

Microsoft Community Contributor Award Recipient

Windows 10 Home 64Bit

 Clean boot
Reduce items at start-up. No software except anti-virus is required plus doing this improves the time for logging into windows:Run the System File Checker that scans the of all protected Windows 7 system files and replaces incorrect corrupted, changed/modified, or damaged versions with the correct versions if possible:
  • Click on the
  • Type CMD on Search
  • Left click and Run as Administrator
  • Type SFC /scannow
Full tutorial here:Run Disk Check on your Hard Drive for file system errors and bad sectors on it.

 Hard Drive Diagnostics

  • Double click and open my computer.
  • Right click on desired drive and hit properties.
  • Click on tools tab and Check now.

Read complete instructions on the tutorial: Disk Check

Other Tests:

Microsoft (R) Windows Debugger Version 10.0.10240.9 X86
Copyright (c) Microsoft Corporation. All rights reserved.

Loading Dump File [C:\Users\Yusra\Downloads\SLY-HP-09_11_2015_220533_04\110615-14227-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available

************* Symbol Path validation summary **************
Response                         Time (ms)     Location
Deferred                                       SRV*c:\symbols*
Symbol search path is: SRV*c:\symbols*
Executable search path is: 
No .natvis files found at C:\Program Files\Windows Kits\10\Debuggers\x86\Visualizers.
Windows 7 Kernel Version 7601 (Service Pack 1) MP (8 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7601.19018.amd64fre.win7sp1_gdr.150928-1507
Machine Name:
Kernel base = 0xfffff800`0381c000 PsLoadedModuleList = 0xfffff800`03a63730
Debug session time: Fri Nov  6 20:00:52.051 2015 (UTC + 6:00)
System Uptime: 0 days 0:00:22.957
Loading Kernel Symbols

Press ctrl-c (cdb, kd, ntsd) or ctrl-break (windbg) to abort symbol loads that take too long.
Run !sym noisy before .reload to track down problems loading symbols.

Loading User Symbols
Loading unloaded module list
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *

Use !analyze -v to get detailed debugging information.

BugCheck B8, {fffffa80105835a0, fffff80003a1dcc0, 0, 0}

Probably caused by : ntkrnlmp.exe ( nt!SwapContext_PatchXRstor+120 )

Followup:     MachineOwner

0: kd> !analyze -v
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *

A wait operation, attach process, or yield was attempted from a DPC routine.
This is an illegal operation and the stack track will lead to the offending
code and original DPC routine.
Arg1: fffffa80105835a0, Original thread which is the cause of the failure
Arg2: fffff80003a1dcc0, New thread
Arg3: 0000000000000000, Stack address of the original thread
Arg4: 0000000000000000

Debugging Details:



BIOS_DATE:  11/04/2013



BUGCHECK_P1: fffffa80105835a0

BUGCHECK_P2: fffff80003a1dcc0





CPU_MHZ: 892

CPU_VENDOR:  GenuineIntel









ANALYSIS_VERSION: 10.0.10240.9 x86fre


STACK_OVERFLOW: Stack Limit: fffff80000b9afb0. Use (kF) and (!stackusage) to investigate stack usage.

LAST_CONTROL_TRANSFER:  from fffff800038935b4 to fffff80003890200

fffff800`00b9abf8 fffff800`038935b4 : 00000000`000000b8 fffffa80`105835a0 fffff800`03a1dcc0 00000000`00000000 : nt!KeBugCheckEx
fffff800`00b9ac00 00000000`000000b8 : fffffa80`105835a0 fffff800`03a1dcc0 00000000`00000000 00000000`00000000 : nt!SwapContext_PatchXRstor+0x120
fffff800`00b9ac08 fffffa80`105835a0 : fffff800`03a1dcc0 00000000`00000000 00000000`00000000 00000000`00000201 : 0xb8
fffff800`00b9ac10 fffff800`03a1dcc0 : 00000000`00000000 00000000`00000000 00000000`00000201 00000000`00000002 : 0xfffffa80`105835a0
fffff800`00b9ac18 00000000`00000000 : 00000000`00000000 00000000`00000201 00000000`00000002 fffff800`03887fbd : nt!KiInitialThread

STACK_COMMAND:  .thread 0xfffffa80105835a0 ; kb

fffff800`038935b4 c3              ret


SYMBOL_NAME:  nt!SwapContext_PatchXRstor+120

FOLLOWUP_NAME:  MachineOwner


IMAGE_NAME:  ntkrnlmp.exe


IMAGE_VERSION:  6.1.7601.19018

FAILURE_BUCKET_ID:  X64_0xB8_nt!SwapContext_PatchXRstor+120

BUCKET_ID:  X64_0xB8_nt!SwapContext_PatchXRstor+120

PRIMARY_PROBLEM_CLASS:  X64_0xB8_nt!SwapContext_PatchXRstor+120


FAILURE_ID_HASH_STRING:  km:x64_0xb8_nt!swapcontext_patchxrstor+120

FAILURE_ID_HASH:  {21c47b72-ebac-db5b-19e0-cb94026da3c8}

Followup:     MachineOwner
My System SpecsSystem Spec

 BSOD on startup, error code:b8

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