This tests #30634 and #30639 for the TSAN/MSAN failure with vm.mmap_rnd_bits=32 described in #30674.
Since I have two different machines for CI and only one has vm.mmap_rnd_bits=32, I normally expect either TSAN or MSAN to fail, but not both. I'll manually restart where needed to get it to run on the right machine.