}
	}
	return nil
}

func TestSegv(t *testing.T) {
	switch runtime.GOOS {
	case "plan9", "windows":
		t.Skipf("no signals on %s", runtime.GOOS)
	}

	for _, test := range []string{"Segv", "SegvInCgo", "TgkillSegv", "TgkillSegvInCgo"} {
		test := test

		// The tgkill variants only run on Linux.
		if runtime.GOOS != "linux" && strings.HasPrefix(test, "Tgkill") {
			continue
		}

	}
	if s := ldr.Lookup("runtime.duffzero", sym.SymVerABIInternal); s != 0 && ldr.AttrReachable(s) {
		addLabelSyms(s, 4, 4*64)
	}

	if ctxt.IsDarwin() {
		big := false
		for _, seg := range ld.Segments {
			if seg.Length >= machoRelocLimit {
				big = true
				break
			}
		}
		if !big {
			return // skip work if nothing big
		}
	}

		g0 := getg()
		sp := getcallersp()
		// The stack bounds for g0 stack is not always precise.
		// Use an artificially small stack, to trigger a stack overflow
		// without actually run out of the system stack (which may seg fault).
		g0.stack.lo = sp - 4096 - stackSystem
		g0.stackguard0 = g0.stack.lo + stackGuard
		g0.stackguard1 = g0.stackguard0

		stackOverflow(nil)
	})
}

func stackOverflow(x *byte) {

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