I'm running on OSX and am getting the following error when running func start in VSCODE terminal on a function project. Why is Azure Functions trying to create a shared memory directory on /dev/shm when there's no write access to /dev directory? I realized that the function still runs but the error persists. (.venv) (base) Me@me-mbp CreateAnAzureFunction % func start Found Python version 3.7.2 (python3). Azure Functions Core Tools Core Tools Version: 3.0.3477 Commit hash:

@Abbie Weisenbloom This is part of the python worker as part of this feature that adds support for shared memory between the runtime and the worker. The log that you see is a warning (check this line ) and considering the worker does eventually start, another location worked.

I've lookup /dev in my macOS, and there is no device named /dev/shm found. Searched web for answers, /dev/shm maps shared memory, and it seems to have some difference between Linux and macOS on mapping shared memory. https://stackoverflow.com/questions/31278519/location-of-dev-shm-on-mac-os-x

Azure Functions Core Tools error (OSX) : /dev/shm/AzureFunctions - shared memory usage

Accepted answer

Pramod Valavala 20,636 Reputation points Microsoft Employee

2021-05-17T11:07:41.787+00:00

@Abbie Weisenbloom This is part of the python worker as part of this feature that adds support for shared memory between the runtime and the worker.

The log that you see is a warning (check this line) and considering the worker does eventually start, another location worked.
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3 people found this answer helpful.
Abbie Weisenbloom 56 Reputation points

2021-05-18T05:45:04.957+00:00

Thank you for clarifying that for me!

Vincent Ayorinde 16 Reputation points

2021-06-19T07:22:52.363+00:00

I get stuck here, what is the solution to this?

Vincent Ayorinde 16 Reputation points

2021-06-19T07:26:07.127+00:00

WARNING: You are using pip version 20.2.3; however, version 21.1.2 is available. You should consider upgrading via the '/Users/vinay/Documents/_projects/azure/newFunctionProject/.venv/bin/python -m pip install --upgrade pip' command. > Executing task: . .venv/bin/activate && func host start < Found Python version 3.9.1 (python3). Azure Functions Core Tools Core Tools Version: 3.0.3568 Commit hash: e30a0ede85fd498199c28ad699ab2548593f759b (64-bit) Function Runtime Version: 3.0.15828.0 [2021-06-19T07:20:46.190Z] Cannot create directory for shared memory usage: /dev/shm/AzureFunctions [2021-06-19T07:20:46.190Z] System.IO.FileSystem: Access to the path '/dev/shm/AzureFunctions' is denied. Operation not permitted. Value cannot be null. (Parameter 'provider')

Tedo Gogoladze 6 Reputation points

2021-08-13T11:14:25.92+00:00

Go to the host.json file in your project, remove the section of "extensionBundle" and run it again.

Jason Lau 1 Reputation point

2021-09-14T03:11:33.473+00:00

Is anyone fix the issue ? I have the same problem.

Jonathan Crockett 1 Reputation point

2021-12-06T19:23:35.337+00:00

I am seeing this issue as well using Node on Mac OS.

Codjo Daniel Habib Todegnon 26 Reputation points

2022-10-10T20:21:33.3+00:00

Thanks for the tricks.

Garcia, Josias 0 Reputation points

2023-04-06T08:38:10.4566667+00:00

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Azure Functions Core Tools error (OSX) : /dev/shm/AzureFunctions - shared memory usage

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