Sometimes we catch a bug with Debug Registers in the ptrace(2) tests: NetBSD/amd64 http://releng.netbsd.org/b5reports/amd64/2018/2018.03.06.11.21.31/test.html#lib_libc_sys_t_ptrace_wait6_dbregs_dr3_trap_variable_readwrite_write_2bytes NetBSD/i386 http://releng.netbsd.org/b5reports/i386/2017/2017.12.06.17.54.58/test.html#lib_libc_sys_t_ptrace_wait3_dbregs_dr2_trap_variable_readwrite_read_2bytes I was trying to reproduce this locally on a real hardware and in qemu (softemu), including concurrent execution, but after merely 100M attempts to reproduce the test-case, I've not encountered a single failure. Are there some special properties of these releng machines? qemu+kvm?
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