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210089cfa0
wenli xie reported a buffer cache deadlock when an overlayfs is mounted atop xfs and overlayfs tries to replace a single-nlink file with a whiteout file. This test reproduces that deadlock. Reported-by: wenli xie <wlxie7296@gmail.com> Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Eryu Guan <guaneryu@gmail.com>