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Martin Vogel
5987629682
Since the hosted runner image changed on 2026-11-11 the MSan lane aborts before any test runs: MemorySanitizer: CHECK failed: msan_linux.cpp:193 "((personality(old_personality | ADDR_NO_RANDOMIZE))) != ((-1))" The runner kernel now randomizes mmap with more bits than MSan's shadow layout tolerates, so the runtime tries to re-exec itself with ADDR_NO_RANDOMIZE; inside the lane's container the default seccomp profile refuses that personality() call. The last green MSan run was 2026-11-11 01:28Z (run 42939151247); every PR run with the lane since 18:45Z failed this way (runs 43080749803, 43081615012), independent of the change under test. The TSan leg hit the same kernel behaviour earlier and lowers vm.mmap_rnd_bits to 28 on Linux before its suite. Do the same on the host before the MSan container starts; the container shares the host kernel, so MSan's layout fits again without disabling ASLR in the container. `|| true` keeps the step from failing where sysctl is not permitted, exactly as in the TSan step. Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>