Date: Mon, 13 Sep 2010 10:02:38 +0200 From: Stefan Bethke <stb@lassitu.de> To: Oliver Fromme <olli@lurza.secnetix.de> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Serial console problems with stable/8 Message-ID: <4534A77E-FE4B-4FE2-9F90-F5F7125EF62A@lassitu.de> In-Reply-To: <201009121526.o8CFQC7T062317@lurza.secnetix.de> References: <201009121526.o8CFQC7T062317@lurza.secnetix.de>
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Am 12.09.2010 um 17:26 schrieb Oliver Fromme: > I cannot even su(1) to root because it tries to print > a message to the console, so it hangs, too. For the same > reason I can't use shutdown(8) either. :-( >=20 > This is what a hanging su(1) command looks like in ps -alxww: > UID PID PPID CPU PRI NI VSZ RSS MWCHAN STAT TT TIME = COMMAND > 0 1533 1532 0 76 0 3392 3180 ttydcd I+ 0 0:00.05 su = (zsh) >=20 > Interestingly, the KDB sequences CR ~ ^B/^P/^R/ do work, > which use the "low-level" console. So only the "high-level" > console is frozen. Looking at the WCHAN, I'd speculate that it's waiting for DCD to become = active. Are you using a proper cable with handshaking, or a three-wire = cable? See what stty thinks the port is set to. It probably has clocal set, = but shouldn't. See if you can unwedge it by setting -clocal with stty, = then pick a proper cable or gettytab entry. Stefan --=20 Stefan Bethke <stb@lassitu.de> Fon +49 151 14070811
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