prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x0, 0x0, &(0x7f0000000000))
msgsnd(0x0, 0x0, 0x0, 0x0)
msgrcv(0x0, &(0x7f0000000140)={0x0, ""/246}, 0xfe, 0x8000000000000000, 0x0)