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The fix for bpo-10916 commited in r88022 introduces this line:
map_size=st.st_size-offset;
If offset > st.st_size, map_size is negative. This should cause the mmap system call to return -1 and set errno.
However, given a certain size of offset, since map_size is unsigned it will give a very large map_size and access the resultant mmap object results in a bus error crash. It also gives bogus len(mmap) values.
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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