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Flaky: TestSnapshotterSuite/DevMapperUsage #4965

@estesp

Description

@estesp

This seems to be failing more regularly in our main branch CI test runs:

--- FAIL: TestSnapshotterSuite/DevMapperUsage (0.64s)
Error:         snapshotter_test.go:140: assertion failed: expression is false: layer2Usage.Size < sizeBytes+256*dmsetup.SectorSize

Haven't had a chance to dig deeper; any ideas? (cc: @mxpv)
Example run: https://github.com/containerd/containerd/pull/4964/checks?check_run_id=1750507042

Related: 2021-02-05 (#5007)

2021-02-05T12:46:32.1109307Z --- FAIL: TestSnapshotterSuite (0.66s)
2021-02-05T12:46:32.1110359Z     --- FAIL: TestSnapshotterSuite/DevMapperUsage (0.65s)
2021-02-05T12:46:32.1118240Z ##[error]        snapshotter_test.go:139: assertion failed: expression is false: layer2Usage.Size > sizeBytes: 1048576 > 1048576
2021-02-05T12:46:32.1130043Z FAIL

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