[ Upstream commit 703586410da69eb40062e64d413ca33bd735917a ] When run on a single CPU, this test would frequently access already-freed memory. Due to timing, this bug never showed up on multi-CPU tests. Reported-by: Chris von Recklinghausen <crecklin@redhat.com> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Sasha Levin <sashal@kernel.org>