Yet another libthr crash

I'm just hitting all the fun bugs today.....

No core dump from this one. Privoxy seems to be a good app to test
multiple io threads and is simple enough to be debug.

Here's what I got this time:

$ /usr/local/sbin/privoxy --no-daemon /usr/local/etc/privoxy/config
Apr 03 15:50:49 Privoxy(134709248) Info: loading configuration file '/usr/local/etc/privoxy/config':
...
Apr 03 15:51:09 Privoxy(134922240) Request: www.dilbert.com/images/ffffff_dot.gif
Apr 03 15:51:09 Privoxy(134922240) Error: could not resolve hostname www.dilbert.com
Apr 03 15:51:09 Privoxy(134925312) Request: www.dilbert.com/comics/dilbert/images/dilbertawards_250x50.gif
Apr 03 15:51:09 Privoxy(134992896) Request: www.dilbert.com/comics/dilbert/images/current_features_bullet.gif
gif
Apr 03 15:51:09 Privoxy(134992896) Request: www.dilbert.com/comics/dilbert/images/current_features_bullApr 03 15:51:09 Privoxy(134929408) Request: www.dilbert.com/comics/dilbert/images/current_features_border_righFatal error 'Illegal call from signal handler' at line 1542 in file /local/usr.src/lib/libthr/thread/thr_mutex.c (errno = 2)
$

Kind of odd how the requests are interleaved. And then it seems to have
died somewhere in thr_mutex.c::mutex_queue_enq().

-gordon