A problem with 4.2 exit system call

[jeff%sri-tsc at turtlevax.UUCP]

The exit() routine (in kern_exit.c) has a line I don't understand.
Right after a process releases the memory for its page tables and u area,
there is an spl5() call like so:

	vrelpt(u.u_procp);
	vrelu(u.u_procp, 0);
	(void) spl5();		/* hack for mem alloc race XXX */

Does anybody know what race they're talking about?

Please respond directly to me.  Thanks a great deal for any help you
can offer me.

			Jeff Doughty
			Cadlinc, Inc.

		{sri-tsc,hplabs,nsc,decwrl}!turtlevax!jeff

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		dan at sri-tsc