https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64001
--- Comment #7 from Ian Lance Taylor <ian at airs dot com> --- Sorry, I missed that this only happens with 4.9. Unfortunately, I was also unable to reproduce it with 4.9. I have no idea what the problem is. If you can still reproduce it, run it under strace to see what values mmap returns and make sure it returns normal values. Otherwise, the only thing I can think of is that somehow memory is being corrupted. That could be due to changes in the garbage collector. I haven't seen any other reports that suggest this, though.
