I am in js-mode.
The screenshot shows where I typed the = and emacs is completely frozen. No C-g, Esc, or q does anything.
I have no idea how to even start debugging this.
Emacs Stack Exchange is a question and answer site for those using, extending or developing Emacs. It only takes a minute to sign up.
Sign up to join this community
Anybody can ask a question
Anybody can answer
The best answers are voted up and rise to the top
ps -C emacs -o f,s,uid,pid,ppid,tid,c,pri,ni,vsz,sz,rss,addr,wchan,stat,tty,time,cmd(assuming you are running on Linux - you might have to modify the command slightly on other Unixes; see the ps(1) man page - I don't know what to do on Windows). You can also trystrace -p <PID>where<PID>is the process id of the Emacs process: see thepidcolumn of thepscommand. Move the mouse over the Emacs frame and see ifstraceproduces any additional output ...polland blocks onpselectuntil some event happens and then there should a flurry of activity for a bit and then anotherpollwill happen and thepselectwill block until the next event. But if you move the mouse over the Emacs frame, and nothing happens in thestraceoutput, then it is well and truly hung. You might want to edit your question and add the last few lines of the strace output as well, although it might be not useful: if the strace is started after the hang, the only thing that will appear is the last system call Emacs did - maybe...=character. If Emacs doesn't hang then we can narrow down the search to the font-lock rules. I can provide some guidance on how to do this.