Python language worker times out at startup

[balag0]

FunctionsLogs
| where RoleInstance contains "171AE528-636740959597695685"
| where TIMESTAMP >= datetime(2018-10-02 16:55:00.0000000)
| where TIMESTAMP <= datetime(2018-10-02 16:55:00.0000000) + 30m
| where Tenant == "fe133483000c4137a26aabfc6365308c"
| where SourceNamespace == "LWAWS"
| extend t = todatetime(EventTimestamp)
| order by t asc
| where Summary !contains "host availability"

	t	Source	Details	Summary	ExceptionType	ExceptionMessage
	2018-10-02 17:21:40.1780000	Worker.python.6261ebf9-cf33-4c4d-9fd2-7954e104d96c	System.TimeoutException : The operation has timed out.	Language Worker Process exited.	System.TimeoutException	The operation has timed out.
	2018-10-02 17:21:41.6600000	Worker.python.6261ebf9-cf33-4c4d-9fd2-7954e104d96c	Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerProcessExitException : bash exited with code 137	Language Worker Process exited.	Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerProcessExitException	bash exited with code 137
	2018-10-02 17:22:21.6860000	Worker.python.b6d0060c-2e99-4746-a05b-1862e323f36a	System.TimeoutException : The operation has timed out.	Language Worker Process exited.	System.TimeoutException	The operation has timed out.
	2018-10-02 17:22:23.6880000	Worker.python.b6d0060c-2e99-4746-a05b-1862e323f36a	Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerProcessExitException : bash exited with code 137	Language Worker Process exited.	Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerProcessExitException	bash exited with code 137
	2018-10-02 17:23:04.2140000	Worker.python.f1e47f9e-4198-4cbf-ab79-203c952c6a89	System.TimeoutException : The operation has timed out.	Language Worker Process exited.	System.TimeoutException	The operation has timed out.
	2018-10-02 17:23:06.2160000	Worker.python.f1e47f9e-4198-4cbf-ab79-203c952c6a89	Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerProcessExitException : bash exited with code 137	Language Worker Process exited.	Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerProcessExitException	bash exited with code 137
	2018-10-02 17:23:12.4250000	Worker.python.f1e47f9e-4198-4cbf-ab79-203c952c6a89	Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerProcessExitException : Worker process is not attached.  ---\u003e System.InvalidOperationException : No process is associated with this object.    at System.Diagnostics.Process.EnsureState(State state)    at System.Diagnostics.Process.get_HasExited()    at System.Diagnostics.Process.EnsureState(State state)    at System.Diagnostics.Process.get_ExitCode()    at Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerChannel.OnProcessExited(Object sender,EventArgs e) at /azure-functions-host-26390c79fe40b04617bc7fc3a9add054dec27310/src/WebJobs.Script/Rpc/LanguageWorkerChannel.cs : 188     End of inner exception	Language Worker Process exited.	System.InvalidOperationException	No process is associated with this object.
	2018-10-02 17:23:12.4250000	Worker.python.b6d0060c-2e99-4746-a05b-1862e323f36a	Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerProcessExitException : Worker process is not attached.  ---\u003e System.InvalidOperationException : No process is associated with this object.    at System.Diagnostics.Process.EnsureState(State state)    at System.Diagnostics.Process.get_HasExited()    at System.Diagnostics.Process.EnsureState(State state)    at System.Diagnostics.Process.get_ExitCode()    at Microsoft.Azure.WebJobs.Script.Rpc.LanguageWorkerChannel.OnProcessExited(Object sender,EventArgs e) at /azure-functions-host-26390c79fe40b04617bc7fc3a9add054dec27310/src/WebJobs.Script/Rpc/LanguageWorkerChannel.cs : 188     End of inner exception	Language Worker Process exited.	System.InvalidOperationException	No process is associated with this object.

[asavaritayal]

@balag0 can you share steps for repro?

[balag0]

This issue applies to both python and node.

There might be more than 1 way to repro this. Here is what i used-

Create a python / node linux consumption function app with a hello-world like function.
Hit the function endpoint using atleast 500 virtual clients for 5 minutes.
Some of the workers will hit this issue and return 500s.

[anirudhgarg]

@balag0 Can you please repro and if its not working find out root cause.

[balag0]

No repro anymore.