Not to beat the perms to death but /tmp should have the sticky bit set as well... so 1777 not just 0777. Perhaps hard kill any lingering mysql PIDS unless this is production and u expect other DB's to be running... if u have duplicated this DB schema somewhow by mistake and a second or first identical instance is running it is plausable to assume that the other running instance has locked the file it is using preventing it from being written to.
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