Bugzilla Bug 96896

after upgrading stunnel to version 4.10 it doesnt work as expected. after
accepting connection (through xinetd) and putting banner line into syslog
stunnel process hangs taking 100% cpu. 
downgrading to 4.09 make it work again.

emerge info
Portage 2.0.51.22-r1 (default-linux/x86/2005.0/2.4, gcc-3.4.4, glibc-2.3.5-r0,
2.4.28-gentoo-r3 i686)
=================================================================
System uname: 2.4.28-gentoo-r3 i686 Celeron (Mendocino)
Gentoo Base System version 1.6.12
distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632)
[enabled]
dev-lang/python:     2.4.1-r1
sys-apps/sandbox:    1.2.9
sys-devel/autoconf:  2.13, 2.59-r6
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.5
sys-devel/binutils:  2.16.1
sys-devel/libtool:   1.5.18
virtual/os-headers:  2.4.22-r1
ACCEPT_KEYWORDS="x86 ~x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-pipe -march=pentium2 -O2 -fstack-protector"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3/share/config
/usr/share/config /var/bind /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-pipe -march=pentium2 -O2 -fstack-protector"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig collision-protect distcc distlocks sandbox sfperms strict
userpriv usersandbox"
GENTOO_MIRRORS="http://gentoo.mirror.solnet.ch
http://linux.rz.ruhr-uni-bochum.de/download/gentoo-mirror
http://trumpetti.atm.tut.fi/gentoo/"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/home/portagetmp"
PORTDIR="/usr/portage"
SYNC="rsync://1g.compfort.com.pl/gentoo-portage"
USE="x86 alsa apm arts avi berkdb bitmap-fonts caps chroot clearpasswd crypt
cups curl elf emboss encode foomaticdb gd gif gpm hardened imlib kde libg++
libwww mad mbox mikmod minimal motif mp3 mpeg ncurses oggvorbis opengl oss pam
pam_chroot pam_timestamp pdflib perl png pwdb python qt quicktime readline sdl
sendfile sftplogging ssl tcpd threads truetype-fonts type1-fonts xinetd xml2
xmms xv zlib userland_GNU kernel_linux elibc_glibc"
Unset:  ASFLAGS, CTARGET, LANG, LC_ALL, LDFLAGS, LINGUAS, PORTDIR_OVERLAY

Well, upstream did call this an experiemental release. You might look through
the ChangeLog or something else to see whats going on. 

Created an attachment (id=61855) [edit]
patch against stunnel-4.10 to fix for inetd mode

I've hit this problem, too, though it segfaulted instead of hanging.
This is the patch from
http://linode.mirt.net/pipermail/stunnel-users/2005-June/000497.html. It works
fine for me.

Committed 4.10-r1, thanks for the patch!