This article describes an issue that occurs when an application receives characteristic value changed events from Bluetooth low energy (Bluetooth LE) devices in Windows 8.1. A hotfix is available to resolve this issue. The hotfix has a prerequisite.

Cause

The issue occurs because a callback routine registered by the BluetoothGATTRegisterEvent function is called by multiple threads at the same time.

Hotfix information

Important If you install a language pack after you install this hotfix, you must reinstall this hotfix. Therefore, we recommend that you install any language packs that you need before you install this hotfix. For more information, see Add language packs to Windows.

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows 8.1.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 8.1 file information and notes

Important Windows 8.1 hotfixes and Windows Server 2012 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8.1/Windows Server 2012 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.3.960 0.17xxx

    Windows 8.1 and Windows RT 8.1

    RTM

    GDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 8.1

File name

File version

File size

Date

Time

Platform

Bluetoothapis.dll

6.3.9600.17931

79,872

10-Jul-2015

16:52

x86

Bthmigplugin.dll

6.3.9600.17415

80,896

29-Oct-2014

01:33

x86

Bthudtask.exe

6.3.9600.17415

35,840

29-Oct-2014

01:32

x86

Wshbth.dll

6.3.9600.17415

50,688

29-Oct-2014

01:00

x86

For all supported x64-based versions of Windows 8.1

File name

File version

File size

Date

Time

Platform

Bluetoothapis.dll

6.3.9600.17931

104,960

10-Jul-2015

17:46

x64

Bthmigplugin.dll

6.3.9600.17415

95,744

29-Oct-2014

02:11

x64

Bthudtask.exe

6.3.9600.17415

37,888

29-Oct-2014

02:09

x64

Wshbth.dll

6.3.9600.17415

63,488

29-Oct-2014

01:21

x64

Bluetoothapis.dll

6.3.9600.17931

79,872

10-Jul-2015

16:52

x86

Bthmigplugin.dll

6.3.9600.17415

80,896

29-Oct-2014

01:33

x86

Bthudtask.exe

6.3.9600.17415

35,840

29-Oct-2014

01:32

x86

Wshbth.dll

6.3.9600.17415

50,688

29-Oct-2014

01:00

x86

For all supported Windows RT 8.1

File name

File version

File size

Date

Time

Platform

Bluetoothapis.dll

6.3.9600.17935

71,680

15-Jul-2015

01:45

Not applicable

Bthmigplugin.dll

6.3.9600.16384

74,240

22-Aug-2013

02:45

Not applicable

Bthudtask.exe

6.3.9600.16384

36,864

22-Aug-2013

02:44

Not applicable

Wshbth.dll

6.3.9600.17238

44,032

24-Jul-2014

08:04

Not applicable

Additional file information

Additional file information for Windows 8.1

Additional files for all supported x86-based versions of Windows 8.1

File property

Value

File name

X86_c671add4ca6f510bd729c926187abaca_31bf3856ad364e35_6.3.9600.17935_none_c2e645c0d7c11a70.manifest

File version

Not applicable

File size

696

Date (UTC)

15-Jul-2015

Time (UTC)

13:59

Platform

Not applicable

File name

X86_microsoft-windows-bth-user_31bf3856ad364e35_6.3.9600.17935_none_f9f008f4f09e3ee5.manifest

File version

Not applicable

File size

9,509

Date (UTC)

15-Jul-2015

Time (UTC)

14:02

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 8.1

File property

Value

File name

Amd64_256f9abce0f32956d8a80c27e7e0cef9_31bf3856ad364e35_6.3.9600.17935_none_5ddf740c067884cf.manifest

File version

Not applicable

File size

700

Date (UTC)

15-Jul-2015

Time (UTC)

13:59

Platform

Not applicable

File name

Amd64_963f2998fae03e76fd39538538f9a33b_31bf3856ad364e35_6.3.9600.17935_none_a78a288c97725455.manifest

File version

Not applicable

File size

700

Date (UTC)

15-Jul-2015

Time (UTC)

13:59

Platform

Not applicable

File name

Amd64_microsoft-windows-bth-user_31bf3856ad364e35_6.3.9600.17935_none_560ea478a8fbb01b.manifest

File version

Not applicable

File size

9,515

Date (UTC)

15-Jul-2015

Time (UTC)

14:06

Platform

Not applicable

File name

Wow64_microsoft-windows-bth-user_31bf3856ad364e35_6.3.9600.17935_none_60634ecadd5c7216.manifest

File version

Not applicable

File size

7,262

Date (UTC)

15-Jul-2015

Time (UTC)

14:06

Platform

Not applicable

Additional files for all supported Windows RT 8.1

File property

Value

File name

Arm_5cee3f35583878aef73f0119548516bd_31bf3856ad364e35_6.3.9600.17935_none_f38dd9e30ae1e800.manifest

File version

Not applicable

File size

696

Date (UTC)

15-Jul-2015

Time (UTC)

13:59

Platform

Not applicable

File name

Arm_microsoft-windows-bth-user_31bf3856ad364e35_6.3.9600.17935_none_f9f27b4cf09b5dab.manifest

File version

Not applicable

File size

9,509

Date (UTC)

15-Jul-2015

Time (UTC)

13:59

Platform

Not applicable

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

See the terminology that Microsoft uses to describe software updates.

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