D58472.diff
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	diff --git a/sys/geom/zero/g_zero.c b/sys/geom/zero/g_zero.c
	--- a/sys/geom/zero/g_zero.c
	+++ b/sys/geom/zero/g_zero.c
	@@ -83,11 +83,6 @@
	size_t length;
	vm_offset_t offset;

	- aiovec.iov_base = g_zero_buffer;
	- aiovec.iov_len = PAGE_SIZE;
	- auio.uio_iov = &aiovec;
	- auio.uio_iovcnt = 1;
	- auio.uio_offset = 0;
	auio.uio_segflg = UIO_SYSSPACE;
	auio.uio_rw = UIO_WRITE;
	auio.uio_td = curthread;
	@@ -101,6 +96,12 @@
	bp->bio_resid = bp->bio_length;
	offset = bp->bio_ma_offset & PAGE_MASK;
	for (int i = 0; i < bp->bio_ma_n && bp->bio_resid > 0; i++) {
	+ aiovec.iov_base = g_zero_buffer;
	+ aiovec.iov_len = PAGE_SIZE;
	+ auio.uio_iov = &aiovec;
	+ auio.uio_iovcnt = 1;
	+ auio.uio_offset = 0;
	+
	length = MIN(PAGE_SIZE - offset, bp->bio_resid);
	auio.uio_resid = length;