D27094.diff
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	Index: head/sys/kern/sys_pipe.c
	===================================================================
	--- head/sys/kern/sys_pipe.c
	+++ head/sys/kern/sys_pipe.c
	@@ -1458,13 +1458,17 @@
	}

	if (revents == 0) {
	- if (fp->f_flag & FREAD && events & (POLLIN \| POLLRDNORM)) {
	+ /*
	+ * Add ourselves regardless of eventmask as we have to return
	+ * POLLHUP even if it was not asked for.
	+ */
	+ if ((fp->f_flag & FREAD) != 0) {
	selrecord(td, &rpipe->pipe_sel);
	if (SEL_WAITING(&rpipe->pipe_sel))
	rpipe->pipe_state \|= PIPE_SEL;
	}

	- if (fp->f_flag & FWRITE && events & (POLLOUT \| POLLWRNORM)) {
	+ if ((fp->f_flag & FWRITE)!= 0) {
	selrecord(td, &wpipe->pipe_sel);
	if (SEL_WAITING(&wpipe->pipe_sel))
	wpipe->pipe_state \|= PIPE_SEL;