See kernel changelogs: http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.20.15 http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21.6 Reproducible: Always
[linux < 2.6.20.15] c57b6320b85a739537cd67142f0c7c601e79ec05 [linux >= 2.6.21 < 2.6.21.6] fcc56368e2c29ef4fb91d9374cea4834d0a6eb61 also in 2.6.22 as 25845b5155b55cd77e42655ec24161ba3feffa47 [gp < 2.6.20-13][gp >= 2.6.21-1 < 2.6.21-6]