To debug scripts in my extension's custom DevTools panel I open another DevTools window over this panel, as it is explained here. Then I return to my DevTools panel, and then, say, go to read documentation in another window of another browser.
In this case both my DevTools windows are paused on promise rejection after a while, and I can see the message:
Exception: Error: Readers took over 1500ms. Possible deadlock?
at devtools://devtools/bundled/devtools-frontend/front_end/ui/components/render_coordinator/render_coordinator.js:1:2388
The same exception/message occur in some other cases, when I do not work with my DevTools panel. Is there a way to suppress this exception, keeping in mind that I can not change built-in Chrome render_coordinator.js JS library?
