19   my_kernel_sigaction act = {}, oldact = {};  in main()  local
22   __msan_poison(&act.handler, sizeof(act.handler));  in main()
23   __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8);  in main()
25   __msan_poison(&act.flags, sizeof(act.flags));  in main()
26   __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8);  in main()
28   __msan_poison(&act.mask, 1);  in main()
29   __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8);  in main()
32   __msan_poison(((char *)&act.mask) + 5, 1);  in main()
33   __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 5);  in main()
35   memset(&act, 0, sizeof(act));  in main()
37   __sanitizer_syscall_post_rt_sigaction(0, SIGUSR1, &act, &oldact, 5);  in main()