After single test debug, Omnisharp "crashes" silently

Environment data

dotnet --info output:

.NET Command Line Tools (2.0.0)

Product Information:
 Version:            2.0.0
 Commit SHA-1 hash:  cdcd1928c9

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.12
 OS Platform: Darwin
 RID:         osx.10.12-x64
 Base Path:   /usr/local/share/dotnet/sdk/2.0.0/

Microsoft .NET Core Shared Framework Host

  Version  : 2.0.0
  Build    : e8b8861ac7faf042c87a5c2f9f2d04c98b69f28d

VS Code version: 1.17.2 b813d12980308015bcd2b3a2f6efa5c810c33ba5 C# Extension version: 1.12.1 Xunit: 2.2.0

Steps to reproduce

• Open a solution folder in VSCode
• Navigate to a test in the project
• Choose to Debug Test
• Allow test to execute to finish (F5)
• Attempt to debug or run test again OR attempt to trigger Intellisense

Expected behavior

After test has run, OmniSharp is able to run and debug tests, and provides Intellisense from open project windows.

Actual behavior

After test has run, OmniSharp will no longer be able to run or debug a test, nor provide intellisense until restart of VSCode.

The following is the output in the OmniSharp Debug Log after turning on logging with "omnisharp.loggingLevel": "debug" (note that classnames and file paths were find/replaced, and base 64 removed – can provide if needed):

[dbug]: OmniSharp.DotNetTest.VSTestManager
        read: {"MessageType":"TestExecution.StatsChange","Payload":{"NewTestResults":[{"TestCase":{"Properties":[{"Key":{"Id":"TestCase.FullyQualifiedName","Label":"FullyQualifiedName","Category":"","Description":"","Attributes":1,"ValueType":"System.String"},"Value":"MyClass.MyTestMethod (cef3ff6adf55e367891e1369e8ce731ad73a47a7)"},{"Key":{"Id":"TestCase.ExecutorUri","Label":"Executor Uri","Category":"","Description":"","Attributes":1,"ValueType":"System.Uri"},"Value":"executor://xunit/VsTestRunner2"},{"Key":{"Id":"TestCase.Source","Label":"Source","Category":"","Description":"","Attributes":0,"ValueType":"System.String"},"Value":"/Users/greg/Code/MySolution/test/MyTestProject/bin/Debug/netcoreapp2.0/MyTestProject.dll"},{"Key":{"Id":"TestCase.CodeFilePath","Label":"File Path","Category":"","Description":"","Attributes":0,"ValueType":"System.String"},"Value":"/Users/greg/Code/MySolution/test/MyTestProject/EndpointTests.cs"},{"Key":{"Id":"TestCase.DisplayName","Label":"Name","Category":"","Description":"","Attributes":0,"ValueType":"System.String"},"Value":"MyClass.MyTestMethod"},{"Key":{"Id":"TestCase.Id","Label":"Id","Category":"","Description":"","Attributes":1,"ValueType":"System.Guid"},"Value":"ab9c8bad-66f9-eb4d-a7e1-7dde43a5d7cf"},{"Key":{"Id":"TestCase.LineNumber","Label":"Line Number","Category":"","Description":"","Attributes":1,"ValueType":"System.Int32"},"Value":91},{"Key":{"Id":"XunitTestCase","Label":"xUnit.net Test Case","Category":"","Description":"","Attributes":0,"ValueType":"System.String"},"Value":"Xunit.Sdk.XunitTestCase, xunit.execution.{Platform}:`/* SNIP Base64 */`"},{"Key":{"Id":"TestObject.Traits","Label":"Traits","Category":"","Description":"","Attributes":5,"ValueType":"System.Collections.Generic.KeyValuePair`2[[System.String],[System.String]][]"},"Value":[{"Key":"Type","Value":"Not-Unit"},{"Key":"Type","Value":"EndToEnd"},{"Key":"Type","Value":"Not-Integration"},{"Key":"Type","Value":"Not-Performance"},{"Key":"Category","Value":"Purpose-Not-Unit"},{"Key":"Category","Value":"Purpose-EndToEnd"},{"Key":"Category","Value":"Purpose-Not-Integration"},{"Key":"Category","Value":"Purpose-Not-Performance"}]}]},"Attachments":[],"Messages":[],"Properties":[{"Key":{"Id":"TestResult.Outcome","Label":"Outcome","Category":"","Description":"","Attributes":0,"ValueType":"Microsoft.VisualStudio.TestPlatform.ObjectModel.TestOutcome, Microsoft.VisualStudio.TestPlatform.ObjectModel, Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"},"Value":2},{"Key":{"Id":"TestResult.ErrorMessage","Label":"Error Message","Category":"","Description":"","Attributes":0,"ValueType":"System.String"},"Value":"Assert.Equal() Failure\nExpected: Accepted\nActual:   BadRequest"},{"Key":{"Id":"TestResult.ErrorStackTrace","Label":"Error Stack Trace","Category":"","Description":"","Attributes":0,"ValueType":"System.String"},"Value":"   at MyClass.<MyTestMethod>d__6.MoveNext() in /Users/greg/Code/MySolution/test/MyTestProject/EndpointTests.cs:line 96\n--- End of stack trace from previous location where exception was thrown ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()"},{"Key":{"Id":"TestResult.DisplayName","Label":"TestResult Display Name","Category":"","Description":"","Attributes":1,"ValueType":"System.String"},"Value":"MyClass.MyTestMethod"},{"Key":{"Id":"TestResult.ComputerName","Label":"Computer Name","Category":"","Description":"","Attributes":0,"ValueType":"System.String"},"Value":"am-mbp-016"},{"Key":{"Id":"TestResult.Duration","Label":"Duration","Category":"","Description":"","Attributes":0,"ValueType":"System.TimeSpan"},"Value":"00:00:12.2100000"},{"Key":{"Id":"TestResult.StartTime","Label":"Start Time","Category":"","Description":"","Attributes":0,"ValueType":"System.DateTimeOffset"},"Value":"2017-10-18T14:51:01.246646-07:00"},{"Key":{"Id":"TestResult.EndTime","Label":"End Time","Category":"","Description":"","Attributes":0,"ValueType":"System.DateTimeOffset"},"Value":"2017-10-18T14:51:01.246651-07:00"}]}],"TestRunStatistics":{"ExecutedTests":1,"Stats":{"Failed":1}},"ActiveTests":[]}}
/Users/greg/.vscode/extensions/ms-vscode.csharp-1.12.1/.omnisharp/run: line 44: 16109 Killed: 9               "${MONO_CMD}" --assembly-loader=strict --config "${CONFIG}" "${OMNISHARP}" "$@"

[rchande]

@galvesribeiro This is a complicated issue and we’re working with the mono and MSBuild teams to investigate.

[bzier]

Same issue for me as well. As mentioned above, just restarting OmniSharp does not help, but it seems that <kbd>CTRL</kbd>+<kbd>Shift</kbd>+<kbd>P</kbd> > Reload Window does restore functionality. A little quicker than quitting VS Code altogether and relaunching.