Using `git bisect`, It appears that this bug has been introduced between v3.3 and v3.4 by this commit: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=57e62324e469e092ecc6c94a7a86fe4bd6ac5172
Using `git bisect`, It appears that this bug has been introduced between v3.3 and v3.4 by this commit: https:/ /git.kernel. org/cgit/ linux/kernel/ git/torvalds/ linux.git/ commit/ ?id=57e62324e46 9e092ecc6c94a7a 86fe4bd6ac5172