prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x0, 0x0, &(0x7f0000001b00))
mremap(&(0x7f0000ffa000/0x2000)=nil, 0x2000, 0x1000, 0x0, &(0x7f0000fff000/0x1000)=nil)