Re: Tramp with global-auto-revert-mode.

[Richard Stallman]

    (gdb) xbacktrace
    Invalid number -2147483630 of repetitions.

Can you investigate the bug in xbacktrace?
Fixing that is very important.  If you can't find
the first bug, but you can fix xbacktrace to operate
correctly in this case, it will be an important contribution.

Meanwhile, you can find out what Lisp functions are running in this
case using the old-fashioned method, by going to Ffuncall frames and
typing

    p *args
    xsymbol

    Tramp handler calls accept-process-output, which calls
    wait_reading_process_input, which may run timers (and does so).