Re: cvs emacs stalls with: error in process filter

[Richard Stallman]

    the QUIT macro checks Vinhibit_quit and I've seen in the debugger that
    this one's set to t. Some other function (timer-event-handler?) probably
    disables inhibit-quit. Here's an xbacktrace:

The bug might be in the clearcase package, which we don't
support, or in Emacs.

You need to find which function binds it to t.
You could do that by looking at the specpdl itself to find the binding
and matching the specpdl contents with the various frames.