atos generating "out of bounds"

We have an example where "atos" fails with an "out of bounds" diagnostic.

atos -o Bug/cmp.dSYM -l 0x10003c000 -arch arm64 0x100371078 0x100102f08
Out of bounds compile unit
0x0000000100335078 (in cmp.dSYM)
0x00000001000c6f08 (in cmp.dSYM)

We have a post-link tool which makes modifications to the text segment and the .dSYM boundle. I have poked around with dwarfdump and llvm-dwarfdump around the addresses mentioned above but not identified any inconsistencies.

Can anyone describe what triggers the error message from "atos"?

thanks

daivd