Photoshop stalling while attempting to crop

Hi there,

Thanks for reaching out!

Sorry to hear about Photoshop stalling when you're trying to crop an image, that doesn't good.

Would you mind telling us which version of Photoshop and the operating system are you working on?
Have you tried resolving the problem yourself?

Could you please try deselecting "Use Graphics Processor" located in Photoshop's Preferences > Performance, then relaunch Photoshop and let us know if it helps? 

If that doesn't help, then try restoring Photoshop's preferences and let us know how it goes.

https://helpx.adobe.com/photoshop/using/preferences.html

Note: Make sure that you back up all your custom presets, brushes & actions before restoring Photoshop's preferences. https://helpx.adobe.com/photoshop/using/preset-migration.html

Regards,
Sahil

Which version of Photoshop and OS?

How much RAM and spare disk capacity do you have?

Have you tried resetting the Photoshop preferences, which you can find under the General tab in Photoshop preferences?