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diff --git a/stand/userboot/test/test.c b/stand/userboot/test/test.c
--- a/stand/userboot/test/test.c
+++ b/stand/userboot/test/test.c
@@ -254,6 +254,11 @@
if (unit > disk_index || disk_fd[unit] == -1)
return (EIO);
n = pread(disk_fd[unit], dst, size, offset);
+ if (n == 0) {
+ printf("%s: end of disk (%ju)\n", __func__, (intmax_t)offset);
+ return (EIO);
+ }
+
if (n < 0)
return (errno);
*resid_return = size - n;

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