Synchronous I/O operations perfomed by extension block extension host

[DonJayamanne]

Please note I have a Mac M1, with sufficient RAM and I believe this is a fairly fast enough machine, however
VS Code hangs, and found the following logs in the console window.

I can see the following messages in the console window in VS Code

 INFO Extension host (LocalProcess pid: 91550) is unresponsive.
localProcessExtensionHost.ts:273 Extension Host
localProcessExtensionHost.ts:274 Debugger attached.
log.ts:417  INFO UNRESPONSIVE extension host: starting to profile NOW
log.ts:437   ERR 
	 at determineExtensionFromCallStack (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:116247)
log.ts:437   ERR 
	 at readFileSync (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:1868057)
	 at c (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671008)
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:437   ERR 
	 at open
	 at openSync (node:fs:596:18)
	 at func (node:electron/js2c/node_init:2:2050)
	 at readFileSync (node:fs:470:22)
	 at (anonymous) (node:electron/js2c/node_init:2:9407)
	 at readFileSync (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:1868057)
	 at c (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671008)
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:437   ERR 
	 at (anonymous) (node:electron/js2c/node_init:2:9407)
	 at readFileSync (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:1868057)
	 at c (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671008)
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:437   ERR 
	 at splitPath (node:electron/js2c/node_init:2:681)
	 at (anonymous) (node:electron/js2c/node_init:2:9407)
	 at readFileSync (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:1868057)
	 at c (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671008)
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:427  WARN UNRESPONSIVE extension host: 'ms-python.python' took 85.33076491088812% of 4274.253ms, saved PROFILE here: 'file:///var/folders/_7/7q__vcg961x5x6k8313dvzq40000gn/T/exthost-ea01a0.cpuprofile'

 INFO UNRESPONSIVE extension host: starting to profile NOW
log.ts:437   ERR 
	 at determineExtensionFromCallStack (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:116247)
log.ts:437   ERR 
	 at readFileSync (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:1868057)
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:437   ERR 
	 at open
	 at openSync (node:fs:596:18)
	 at func (node:electron/js2c/node_init:2:2050)
	 at readFileSync (node:fs:470:22)
	 at (anonymous) (node:electron/js2c/node_init:2:9407)
	 at readFileSync (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:1868057)
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:437   ERR 
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:427  WARN UNRESPONSIVE extension host: 'ms-python.python' took 88.06868686868687% of 4446.588ms, saved PROFILE here: 'file:///var/folders/_7/7q__vcg961x5x6k8313dvzq40000gn/T/exthost-e0d69f.cpuprofile'

[DonJayamanne]

exthost-e0d69f.cpuprofile.txt
exthost-ea01a0.cpuprofile.txt
Python.log

[DonJayamanne]

Ran into this again after upgrading VS COde, and clearing Python cache.
Python interpreter picker didnt show up for a few seconds, thats what lead me to believe the ext host is frozen

Extension Host
localProcessExtensionHost.ts:274 Debugger attached.
log.ts:417  INFO UNRESPONSIVE extension host: starting to profile NOW
log.ts:437   ERR 
	 at determineExtensionFromCallStack (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:116247)
log.ts:437   ERR 
	 at readFileSync (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:1868057)
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:437   ERR 
	 at open
	 at openSync (node:fs:596:18)
	 at func (node:electron/js2c/node_init:2:2050)
	 at readFileSync (node:fs:470:22)
	 at (anonymous) (node:electron/js2c/node_init:2:9407)
	 at readFileSync (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:1868057)
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:437   ERR 
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:437   ERR 
	 at splitPath (node:electron/js2c/node_init:2:681)
	 at readFileSync (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:1868057)
	 at p (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:671327)
	 at (anonymous) (file:///Users/donjayamanne/.vscode-insiders/extensions/ms-python.python-2024.3.10581547/out/client/extension.js:2:383360)
log.ts:427  WARN UNRESPONSIVE extension host: 'ms-python.python' took 91.67305717795021% of 4585.677ms, saved PROFILE here: 'file:///var/folders/_7/7q__vcg961x5x6k8313dvzq40000gn/T/exthost-30ae66.cpuprofile'
log.ts:417  INFO Extension host (LocalProcess pid: 77659) is responsive.

[DonJayamanne]

[karrtikr]

Another costly sync I/O operation: https://github.com/microsoft/vscode-python/pull/21377/files#r1508133207