[uml-user] Unable to use stdin (kernel/agetty woes?)

[Michael K. <Mic...@ma...>]

I feel like I'm missing something really simple.

I'm running several Slack images in UML. I've been successfully 
running 2.4.22 in UML for a week or two.
I tried 2.4.23 using uml-patch-2.4.23-1.

After starting a UML with the new kernel, nothing sent in via stdin 
"registers", and it appears to stop giving anything to stdout after 
init finishes with rc.M.

The previous kernel works just fine on the same disk image, which is 
what has me thinking its the kernel. I have the same problem using a 
prebuilt 2.4.23 kernel from kernels.usermodelinux.org.

I'm attempting to start UML with:

./linux-2.4.23/linux ubd0=/tmp/master.temp,master.disk 
ubd1=master.swap con0="fd:0,fd:1" rw

I've tried with and without con0, con, con1, tty, tty0, etc, etc and 
directing output to different ttys, ports, etc. No luck.

ps says:
27133 pts/1    R      0:01 ./linux-2.4.23/linux [/sbin/agetty]
27135 pts/1    T      0:02 [linux]
27140 pts/1    S      0:00 ./linux-2.4.23/linux [/sbin/agetty]

This makes me think agetty is hanging, which would be consistent with 
what I'm seeing, but I cannot see whats causing it. /etc/inittab has 
the proper c0/tty0 entry (which is not there by default in 
slackware). Again, directing output different places does not seem to 
help.

Relevant part of the kernel config:
CONFIG_STDIO_CONSOLE=y
CONFIG_SSL=y
CONFIG_FD_CHAN=y
CONFIG_NULL_CHAN=y
CONFIG_PORT_CHAN=y
CONFIG_PTY_CHAN=y
CONFIG_TTY_CHAN=y
CONFIG_XTERM_CHAN=y
CONFIG_CON_ZERO_CHAN="fd:0,fd:1"
CONFIG_CON_CHAN="xterm"
CONFIG_SSL_CHAN="pty"
CONFIG_UNIX98_PTYS=y
CONFIG_UNIX98_PTY_COUNT=256

Guesses?
Feeling dumb,
-mKaegler

-- 
Michael Kaegler, Grid Programmer, Information Technology
Marist College,  3399 North Rd, Poughkeepsie, NY 12601
Phone: 845-575-3128        http://www.nsfgrid.marist.edu

Beware of quantum ducks. Quark, Quark.