I've use mgetty on many sites using many RH 6.X's never had a problem.
just some suggestions
You don't have a motherboard with IRDA setup on com2 perhaps?
permissions OK on /dev/ttyS2 (I've never had to set them)
/dev/ttyS0 OK?
just execute from the prompt,
mgetty -D -x9 ttyS0
> i just installed a RH 6.2 system and compiled mgetty as i have always done
> for ppp dialin.
>
> now the login hangs on windows and a terminal dial in doesn't even offer a
> prompt, just spewing out an occasional random character.
>
> the log file has this to say:
>
> 12/12 15:45:49 yS1 init chat failed, exiting...: Interrupted system call
> 12/12 15:45:49 ##### failed in mg_init_data, dev=ttyS1, pid=500
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