Quality and reliability improvements

CLR1

  • Fixed a floating-point overflow in the thread pool’s hill climbing algorithm.

  • When you observe high CPU usage by ntoskrnl!KiPageFault that originates from BGC (as indicated by the clr!*gc_heap::bgc_thread_function), you might want this change so that the GC no longer uses the OS-implemented GetWriteWatch function to track BGC heap modifications. That process is very expensive because each of these page faults must take a process-wide lock. This is especially noticeable in the recent versions of the OS. You are probably seeing that most of the CPU is spent in the ntoskrnl!ExpWaitForSpinLockExclusiveAndAcquire function. This fix makes GC use CLR’s own implementation of the GetWriteWatch function instead.

1 Common Language Runtime (CLR)

Additional information about this security update

For more information about this security update as it relates to Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2, see the following article in the Microsoft Knowledge Base:

4099639 Security Only update for .NET Framework 3.5 SP1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, and 4.7.1 updates for Windows 8.1, RT 8.1 and Server 2012 R2 (KB 4099639)

How to obtain and install the update

Method 1: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog.
 

Method 2: Windows Software Update Services (WSUS)

On your WSUS server, follow these steps:

  1. Click Start, click Administrative Tools, and then click Microsoft Windows Server Update Services 3.0.

  2. Expand ComputerName, and then click Action.

  3. Click Import Updates.

  4. WSUS opens a browser window in which you may be prompted to install an ActiveX control. You must install the ActiveX control to continue.

  5. After the control is installed, you see the Microsoft Update Catalog screen. Enter 4099639 into the Search box, and then click Search.

  6. Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Click Add to add them to your basket.

  7. After you select all the packages that you need, click View Basket.

  8. To import the packages to your WSUS server, click Import.

  9. After the packages are imported, click Close to return to WSUS.

The updates are now available for installation through WSUS.

Update deployment information

For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:

20180508 Security update deployment information: May 8, 2018

Update removal information

Note We do not recommend that you remove any security update. To remove this update, use the Programs and Features item in Control Panel.

Update restart information

This update does not require a system restart after you apply it unless files that are being updated are locked or are being used.

Update replacement information

This update does not replace any previously released update.


File information
The English (United States) version of this software update 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, Windows RT 8.1 and Windows Server 2012 R2 file information

Note: The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

File information

File hash information

File name

SHA1 hash

SHA256 hash

Windows8.1-KB4096236-x64.msu

C554E9B37B66D99472BAA3F6C2407C722D801418

D1F33BBAF31AC3F52719C499482079CB6EA64C9EFB5344B18CDBD0F76B90AD81

Windows8.1-KB4096236-arm.msu

29073361787DEB656FC66BD8289E018D8243511A

341D893A3BEEAEDA2642B8580D43363414603C06D1DD2E9025FE048F4FCB92DB

Windows8.1-KB4096236-x86.msu

FE0514D5CF1DAF91DD79F24CD8FDA7375B61C2AC

95AD475FDD1D6027A54640682ACE31EFBAB37223C11304024C6836DE61593A80

For all supported x64-based versions

File name

File version

File size

Date

Time

mscorlib.dll

4.7.2650.0

5,413,520

21-Mar-2018

04:40

normidna.nlp

59,342

19-Oct-2017

03:38

normnfc.nlp

47,076

19-Oct-2017

03:38

normnfd.nlp

40,566

19-Oct-2017

03:38

normnfkc.nlp

67,808

19-Oct-2017

03:38

normnfkd.nlp

61,718

19-Oct-2017

03:38

clrjit.dll

4.7.2650.0

1,208,456

21-Mar-2018

04:40

clr.dll

4.7.2650.0

10,361,472

21-Mar-2018

04:40

compatjit.dll

4.7.2650.0

1,259,664

21-Mar-2018

04:40

mscordacwks.dll

4.7.2650.0

1,838,240

21-Mar-2018

04:40

mscordbi.dll

4.7.2650.0

1,621,136

21-Mar-2018

04:40

mscorlib.ni.dll

4.7.2650.0

22,646,336

21-Mar-2018

04:49

msvcp120_clr0400.dll

12.0.52519.0

690,008

26-Mar-2018

17:19

msvcr120_clr0400.dll

12.0.52519.0

993,632

26-Mar-2018

17:19

peverify.dll

4.7.2650.0

260,240

21-Mar-2018

04:40

sos.dll

4.7.2650.0

872,056

21-Mar-2018

04:40

system.security.dll

4.7.2650.0

324,696

21-Mar-2018

04:49

system.security.dll

4.7.2650.0

324,696

21-Mar-2018

04:49

mscorlib.dll

4.7.2650.0

5,631,624

21-Mar-2018

04:49

normidna.nlp

59,342

19-Oct-2017

03:38

normnfc.nlp

47,076

19-Oct-2017

03:38

normnfd.nlp

40,566

19-Oct-2017

03:38

normnfkc.nlp

67,808

19-Oct-2017

03:38

normnfkd.nlp

61,718

19-Oct-2017

03:38

clrjit.dll

4.7.2650.0

522,888

21-Mar-2018

04:49

clr.dll

4.7.2650.0

7,240,320

21-Mar-2018

04:49

mscordacwks.dll

4.7.2650.0

1,341,088

21-Mar-2018

04:49

mscordbi.dll

4.7.2650.0

1,167,504

21-Mar-2018

04:49

mscorlib.ni.dll

4.7.2650.0

20,521,528

21-Mar-2018

04:49

msvcp120_clr0400.dll

12.0.52519.0

485,576

26-Mar-2018

17:19

msvcr120_clr0400.dll

12.0.52519.0

987,840

26-Mar-2018

17:19

peverify.dll

4.7.2650.0

188,560

21-Mar-2018

04:49

sos.dll

4.7.2650.0

743,544

21-Mar-2018

04:49

For all supported ARM-based versions

File name

File version

File size

Date

Time

mscorlib.dll

4.7.2650.0

5,632,904

21-Mar-2018

04:37

normidna.nlp

59,342

19-Oct-2017

03:38

normnfc.nlp

47,076

19-Oct-2017

03:38

normnfd.nlp

40,566

19-Oct-2017

03:38

normnfkc.nlp

67,808

19-Oct-2017

03:38

normnfkd.nlp

61,718

19-Oct-2017

03:38

clrjit.dll

4.7.2650.0

686,976

21-Mar-2018

04:37

clr.dll

4.7.2650.0

6,739,320

21-Mar-2018

04:37

mscordacwks.dll

4.7.2650.0

1,295,768

21-Mar-2018

04:37

mscordbi.dll

4.7.2650.0

1,130,384

21-Mar-2018

04:37

mscorlib.ni.dll

4.7.2650.0

20,718,136

21-Mar-2018

04:49

msvcp120_clr0400.dll

12.0.52242.36242

602,080

26-Mar-2018

17:19

msvcr120_clr0400.dll

12.0.52242.36242

634,336

26-Mar-2018

17:19

sos.dll

4.7.2650.0

648,568

21-Mar-2018

04:37

system.security.dll

4.7.2650.0

324,696

21-Mar-2018

04:49

For all supported x86-based versions

File name

File version

File size

Date

Time

system.security.dll

4.7.2650.0

324,696

21-Mar-2018

04:49

mscorlib.dll

4.7.2650.0

5,631,624

21-Mar-2018

04:49

normidna.nlp

59,342

19-Oct-2017

03:38

normnfc.nlp

47,076

19-Oct-2017

03:38

normnfd.nlp

40,566

19-Oct-2017

03:38

normnfkc.nlp

67,808

19-Oct-2017

03:38

normnfkd.nlp

61,718

19-Oct-2017

03:38

clrjit.dll

4.7.2650.0

522,888

21-Mar-2018

04:49

clr.dll

4.7.2650.0

7,240,320

21-Mar-2018

04:49

mscordacwks.dll

4.7.2650.0

1,341,088

21-Mar-2018

04:49

mscordbi.dll

4.7.2650.0

1,167,504

21-Mar-2018

04:49

mscorlib.ni.dll

4.7.2650.0

20,521,528

21-Mar-2018

04:49

msvcp120_clr0400.dll

12.0.52519.0

485,576

26-Mar-2018

17:19

msvcr120_clr0400.dll

12.0.52519.0

987,840

26-Mar-2018

17:19

peverify.dll

4.7.2650.0

188,560

21-Mar-2018

04:49

sos.dll

4.7.2650.0

743,544

21-Mar-2018

04:49

How to obtain help and support for this security update

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