wengzhe commented on issue #11123:
URL: https://github.com/apache/nuttx/issues/11123#issuecomment-1793651232

   As far as I know, both `io_offset` and `io_len` do not count `io_offset`, 
which means the sum of `io_len` should be `io_offset`. If not, I believe it's 
the operation that makes them unequal gets wrong.
   
   You can refer to iob_test.c which always checks whether they're equal. (I 
don't know the official way to run this test, I put it into apps and ran it as 
an app previously)
   
https://github.com/apache/nuttx/blob/c08ccbef029baedf4268756b5e221dae9a08ec65/mm/iob/iob_test.c#L62-L75


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