On Tue, Aug 12, 2025 at 11:28 PM Yeoreum Yun [off-list ref] wrote:

quoted

quoted

But in case of sync, when the MTE fault happens, it doesn't
write to memory so, I think it's fine.

Does it not? I thought MTE gets disabled and we return from the fault
handler and let the write instruction execute. But my memory on this
is foggy. And I don't have a setup right now to test.

Right. when fault is hit the MTE gets disabled.
But in kasan_test_c.c -- See the KUNIT_EXPECT_KASAN_FAIL,
It re-enables for next test by calling kasan_enable_hw_tags().

But before that, does the faulting instruction get executed? After MTE
gets disabled in the fault handler.