From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6)
Gecko/20040510 Epiphany/1.2.4

Description of problem:
Emacs causes a lockup of X when M-x telnet is used. The mouse pointer
gets jerky and eventually stops. The keyboard stops responding, even
to Num Lock. After a while (say, half a minute) the system recovers.
Load avg goes up to 15 or so, and CPU stays at 100% for the duration.
With xemacs the load spike is there as well, but the system doesn't
stop completely.



Version-Release number of selected component (if applicable):
emacs-21.3-14

How reproducible:
Always

Steps to Reproduce:
1. Start emacs
2. M-x telnet sunsite.dk 80
3.
    

Actual Results:  The load avg goes to 15 and X becomes unresponsive

Expected Results:  telnet should have connected to port 80 on sunsite.dk

Additional info:

This may or may not be related to pty handling, as strace shows a lot
of these:

29048 12:54:23 open("/dev/ptye5", O_RDWR) = -1 ENXIO (No such device
or address)
29048 12:54:23 --- SIGALRM (Alarm clock) @ 0 (0) ---
29048 12:54:23 gettimeofday({1088247263, 401741}, NULL) = 0
29048 12:54:23 gettimeofday({1088247263, 402017}, NULL) = 0
29048 12:54:23 gettimeofday({1088247263, 402271}, NULL) = 0
29048 12:54:23 setitimer(ITIMER_REAL, {it_interval={0, 0},
it_value={0, 99470}}, NULL) = 0
29048 12:54:23 sigreturn()              = ? (mask now [])