Comment 2 for bug 21577

Not trivially, no. If it hangs after the point where 'break' drops them to a
shell, that can be helpful. Dropping quiet from the kernel command line also helps.

Otherwise if we know where abouts the hang is, various "set -x" could be added
to the shell scripts to watch where it's at. Is it worth hacking in a debug
option that does a set -x in each script?