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8274750: java/io/File/ failed: '/dev': 191488 != 190976 #6122

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@@ -203,6 +203,13 @@ private static void tryCatch(Space s) {

private static void compare(Space s) {
// On macOS the total size of /dev can vary over time
// so this test is skipped for /dev
if (Platform.isOSX() &&"/dev")) {
out.println("/dev:\n Skipping size comparison for /dev on macOS");
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File f = new File(;
long ts = f.getTotalSpace();
long fs = f.getFreeSpace();
@@ -231,7 +238,6 @@ private static void compare(Space s) {
throw new RuntimeException(e);

// On macOS, the number of 1024 byte blocks might be incorrectly
// calculated by 'df' using integer division by 2 of the number of
// 512 byte blocks, resulting in a size smaller than the actual