WinDbg has a range limit applied for the d-command series. According to the documentation, the limit is at 256 MB. This limit can be bypassed using the L? syntax.
L? Size (with a question mark) means the same as LSize, except that L? Size removes the debugger's automatic range limit. Typically, there is a range limit of 256 MB, because larger ranges are typographic errors. If you want to specify a range that is larger than 256 MB, you must use the L? Size syntax.
However, I tried to do a
du 3ddabac0+8 L 0n6518040
which is only 6.5 MB and it says
Range error in 'du 3ddabac0+8 l 0n6518040.
