error: Undefined Behavior: deallocating ALLOC, which is mmap memory, using C heap deallocation operation
  --> tests/fail-dep/libc/mmap_invalid_dealloc.rs:LL:CC
   |
LL |         libc::free(ptr);
   |         ^^^^^^^^^^^^^^^ Undefined Behavior occurred here
   |
   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
   = note: BACKTRACE:
   = note: inside `main` at tests/fail-dep/libc/mmap_invalid_dealloc.rs:LL:CC

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to 1 previous error