As of kernel 4.0.4 (and probably earlier), writing to /proc/.../mem at a page which is mapped PROT_NONE causes a kernel BUG at mm/memory.c, which kills the writing process. This breaks rr, although I have a workaround which I'm about to land; the workaround temporarily makes the PROT_NONE regions we're writing to PROT_WRITE.
Trevor reported this in the kernel bugzilla already, though I was able to come up with a nice small test program.
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