D55463.1793824401.diff
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	diff --git a/lib/libc/db/mpool/mpool.c b/lib/libc/db/mpool/mpool.c
	--- a/lib/libc/db/mpool/mpool.c
	+++ b/lib/libc/db/mpool/mpool.c
	@@ -214,10 +214,14 @@
	/* Read in the contents. */
	off = mp->pagesize * pgno;
	if ((nr = pread(mp->fd, bp->page, mp->pagesize, off)) != (ssize_t)mp->pagesize) {
	+ int serrno;
	+
	switch (nr) {
	case -1:
	/* errno is set for us by pread(). */
	+ serrno = errno;
	free(bp);
	+ errno = serrno;
	mp->curcache--;
	return (NULL);
	case 0:
	@@ -229,7 +233,9 @@
	break;
	default:
	/* A partial read is definitely bad. */
	+ serrno = errno;
	free(bp);
	+ errno = serrno;
	mp->curcache--;
	errno = EINVAL;
	return (NULL);