KB4502706 - FIX: SQL Server generates core dump with "Failed to monitor external signals" in SQL Server 2017

Applies to: SQL Server 2017 on Windows (all editions)


Assume that you use SQL Server 2017. It may generate core dump with "Failed to monitor external signals" error message that resembles the following:

This program has encountered a fatal error and cannot continue running.

The following diagnostic information is available:

Reason: 0x00000007

Message: Failed to monitor external signals

Process: ProcessId- sqlservr

Thread: ThreadId (application thread 0x1000)

Instance Id: InstanceId

Crash Id: CrashId

Build stamp: BuildStampId

Capturing core dump and information...


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


This issue is fixed in the following cumulative update for SQL Server:

About cumulative updates for SQL Server:

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:


Learn about the terminology that Microsoft uses to describe software updates.