Serial console problems with stable/8
stb at lassitu.de
Mon Sep 13 08:02:40 UTC 2010
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. :-(
> 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)
> 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 Bethke <stb at lassitu.de> Fon +49 151 14070811
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