Kernel (2.4.0) lock-up in "write" (using PTS).

[Alvaro Lopes <alvieboy@alvie.com>]

Hi all

This is somewhat odd, but I seemed to have found some kind of bug in
2.4.0. I  tested the same program in 2.2.17 and it run perfectly.

So, here goes the description:

2.4.0 Kernel hangs up when I do the following stuff:

	* Create a new PTY using openpty();
	* Fork using forkpty. Now, the child process does this:
		- Set the fd 0 line discipline to PPP;
		- tries infinitely to read the standard input.

	The parent process sets the line discipline of the master PTY fd to PPP
also, and then writes to it.


When I say it hangs up I really mean it. Not even the SYSRQ works.

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