All,
I see this in the Error Log of our 3 node SQLServer 2012 AAG. This instance is on the Secondary Replica of our Primary-Secondary-DR SQLServer 2012 AAG.
The SQLServer version is:
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Microsoft SQL Server 2012 (SP3-GDR) (KB4057115) - 11.0.6260.1 (X64) Jan 9 2018 21:31:12 Copyright (c) Microsoft Corporation Enterprise Edition: Core-based Licensing (64-bit) on Windows NT 6.3 <X64> (Build 9600: ) (Hypervisor)
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----------------------------------- Error Log -------------------------------------------------
2018-09-16 00:08:00.68 Server Using 'dbghelp.dll' version '4.0.5'2018-09-16 00:08:00.77 Server ***Unable to get thread context for spid 0
2018-09-16 00:08:00.77 Server * *******************************************************************************
2018-09-16 00:08:00.77 Server *
2018-09-16 00:08:00.77 Server * BEGIN STACK DUMP:
2018-09-16 00:08:00.77 Server * 09/16/18 00:08:00 spid 5084
2018-09-16 00:08:00.77 Server *
2018-09-16 00:08:00.77 Server * Non-yielding Scheduler
2018-09-16 00:08:00.77 Server *
2018-09-16 00:08:00.77 Server * *******************************************************************************
2018-09-16 00:08:00.79 Server Stack Signature for the dump is 0x0000000000000187