Mon, Aug 13, 2001 at 21:48:18, bicknell (Leo Bicknell) wrote about "Very odd tty
hanging problem.":
> >From another window, try to kill the processes as a user, no effect
> with -9 or regular. Try to kill them as root, no effect normal. Kill
> them -9 as root, and all but the first shell will go away, here's
> ps output from an earlier occurance:
>
> PID TT STAT TIME COMMAND
> 20986 p0- IEs+ 0:00.08 -tcsh (tcsh)
'E' means "trying to exit". It already finished any userspace executing,
is in kernel phase, and waits for something. "STATE" below shows wait
channel. But I saw many times processes in this state with _null_ wait
channel. Such semi-zombie is almost always responsible to remove via
terminating of its parent.
IMO most probable variant that there is some uncaught race condition.
But I failed to find it.
> And top of the same:
>
> PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND
> 20986 bicknell 4 0 1344K 908K ttywai 1 0:00 0.00% 0.00% tcsh
/netch
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