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Backupper Pro ambakdrv.sys causes system crash

In about 4 out of 5 attempts to do a system backup, with 6.5.0 and some other recent versions, this particular system crashes. On four other systems, one with a similar motherboard and processor, 6.5.0 operates with no problems.

Here is a minidump trace of one crash ...


Microsoft (R) Windows Debugger Version 10.0.19041.685 AMD64
Copyright (c) Microsoft Corporation. All rights reserved.

Loading Dump File [C:\Windows\Minidump\050321-43984-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available

Symbol search path is: srv*
Executable search path is: 
Windows 10 Kernel Version 19041 MP (4 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 19041.1.amd64fre.vb_release.191206-1406
Machine Name:
Kernel base = 0xfffff803`1200a000 PsLoadedModuleList = 0xfffff803`12c34130
Debug session time: Mon May  3 02:36:07.550 2021 (UTC - 7:00)
System Uptime: 2 days 19:03:44.510
Loading Kernel Symbols

Loading User Symbols
Loading unloaded module list
For analysis of this file, run !analyze -v
0: kd> !analyze -v
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *

Invalid system memory was referenced.  This cannot be protected by try-except.
Typically the address is just plain bad or it is pointing at freed memory.
Arg1: ffff8a83eadf2b70, memory referenced.
Arg2: 0000000000000002, value 0 = read operation, 1 = write operation.
Arg3: fffff80314912357, If non-zero, the instruction address which referenced the bad memory
Arg4: 0000000000000002, (reserved)

Debugging Details:

*** WARNING: Unable to verify timestamp for ambakdrv.sys

Could not read faulting driver name
*** WARNING: Unable to verify timestamp for win32k.sys


    Key  : Analysis.CPU.Sec
    Value: 9

    Key  : Analysis.DebugAnalysisProvider.CPP
    Value: Create: 8007007e on JOY

    Key  : Analysis.DebugData
    Value: CreateObject

    Key  : Analysis.DebugModel
    Value: CreateObject

    Key  : Analysis.Elapsed.Sec
    Value: 33

    Key  : Analysis.Memory.CommitPeak.Mb
    Value: 80

    Key  : Analysis.System
    Value: CreateObject


BUGCHECK_P1: ffff8a83eadf2b70


BUGCHECK_P3: fffff80314912357


READ_ADDRESS: fffff80312d04390: Unable to get MiVisibleState
Unable to get NonPagedPoolStart
Unable to get NonPagedPoolEnd
Unable to get PagedPoolStart
Unable to get PagedPoolEnd
fffff80312c19378: Unable to get Flags value from nt!KdVersionBlock
fffff80312c19378: Unable to get Flags value from nt!KdVersionBlock
unable to get nt!MmSpecialPagesInUse


BLACKBOXBSD: 1 (!blackboxbsd)

BLACKBOXNTFS: 1 (!blackboxntfs)

BLACKBOXPNP: 1 (!blackboxpnp)




TRAP_FRAME:  ffff9d87f1a6fb60 -- (.trap 0xffff9d87f1a6fb60)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=0000000000000000 rbx=0000000000000000 rcx=0000000000000000
rdx=000000000000082f rsi=0000000000000000 rdi=0000000000000000
rip=fffff80314912357 rsp=ffff9d87f1a6fcf0 rbp=ffff8a83d2df9140
 r8=000000000002082f  r9=000000000000002f r10=fffff803122d1520
r11=0000000000000103 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei ng nz na pe nc
fffff803`14912357 44895f30        mov     dword ptr [rdi+30h],r11d ds:00000000`00000030=????????
Resetting default scope

ffff9d87`f1a6f8b8 fffff803`12497e7d : 00000000`00000050 ffff8a83`eadf2b70 00000000`00000002 ffff9d87`f1a6fb60 : nt!KeBugCheckEx
ffff9d87`f1a6f8c0 fffff803`12332210 : fffff803`11b40180 00000000`00000002 ffff9d87`f1a6fbe0 00000000`00000000 : nt!MiSystemFault+0x147dbd
ffff9d87`f1a6f9c0 fffff803`1240ee5e : ffff8a83`b36e8ef0 fffff803`11b40180 ffff9d87`f1a6fc70 00000000`00000000 : nt!MmAccessFault+0x400
ffff9d87`f1a6fb60 fffff803`14912357 : 00000000`00000000 ffff8a83`d2df9140 ffff8a83`b36e8db0 ffff8a83`cbd54180 : nt!KiPageFault+0x35e
ffff9d87`f1a6fcf0 00000000`00000000 : ffff8a83`d2df9140 ffff8a83`b36e8db0 ffff8a83`cbd54180 00000000`00000000 : ambakdrv+0x2357

SYMBOL_NAME:  ambakdrv+2357

MODULE_NAME: ambakdrv

IMAGE_NAME:  ambakdrv.sys

STACK_COMMAND:  .thread ; .cxr ; kb


FAILURE_BUCKET_ID:  AV_VRF_INVALID_ambakdrv!unknown_function

OS_VERSION:  10.0.19041.1

BUILDLAB_STR:  vb_release


OSNAME:  Windows 10

FAILURE_ID_HASH:  {8ed0f2f4-4848-a392-1579-9ae963b45b1f}

Followup:     MachineOwner

Can someone seek a solution?


  • @KNet, What system are you using? Could you offer us the detailed system version information?
    Could you send us the minidump files? We will submit them to our technician to check.
  • Minidump, analysis, and Aomei logs with system description are in attached zip.
  • @KNet, Could you install an old version to check if you will get the same problem?
    In addition, "On four other systems, one with a similar motherboard and processor, 6.5.0 operates with no problems."---Are they using same system versions?
  • All systems are 64bit Windows 21H1 19043.985.
    Confirm you want me to try version 4.5.2. That version is 2 1/2 years old! Might it have compatibility problems?
  • @KNet, v4.5.2 can be used on windows 10. Please try to check it.
  • We installed v4.5.2 on this system but it would not do a system backup it crashed every time.
    FYI v6.5.0 fails on about 1 of six attempts on this particular computer with all parameters exactly the same for each attempt.
    Attached are minidump files etc.
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