diff --git a/doc/go1.11.html b/doc/go1.11.html
index 841ead2..483ecd8 100644
--- a/doc/go1.11.html
+++ b/doc/go1.11.html
@@ -826,7 +826,7 @@
 
 <!-- CL 101715 was reverted -->
 
-<dl id="runtime-again"><dt><a href="/pkg/runtime/">runtime</a></dt>
+<dl id="pkg-runtime"><dt id="runtime-again"><a href="/pkg/runtime/">runtime</a></dt>
   <dd>
 
     <p><!-- CL 70993 -->
diff --git a/doc/go1.13.html b/doc/go1.13.html
index a17337f..8f4035d 100644
--- a/doc/go1.13.html
+++ b/doc/go1.13.html
@@ -904,7 +904,7 @@
 
 </dl><!-- reflect -->
 
-<dl id="runtime"><dt><a href="/pkg/runtime/">runtime</a></dt>
+<dl id="pkg-runtime"><dt><a href="/pkg/runtime/">runtime</a></dt>
   <dd>
     <p> <!-- CL 167780 -->
       Tracebacks, <a href="/pkg/runtime/#Caller"><code>runtime.Caller</code></a>,
diff --git a/doc/go1.14.html b/doc/go1.14.html
index 186899e..7cf73bc 100644
--- a/doc/go1.14.html
+++ b/doc/go1.14.html
@@ -736,7 +736,7 @@
 
 </dl><!-- reflect -->
 
-<dl id="runtime"><dt><a href="/pkg/runtime/">runtime</a></dt>
+<dl id="pkg-runtime"><dt><a href="/pkg/runtime/">runtime</a></dt>
   <dd>
     <p><!-- CL 200081 -->
       <code>runtime.Goexit</code> can no longer be aborted by a
diff --git a/doc/go1.9.html b/doc/go1.9.html
index 3dfdf53..86ee257 100644
--- a/doc/go1.9.html
+++ b/doc/go1.9.html
@@ -862,7 +862,7 @@
 
 </dl><!-- reflect -->
 
-<dl id="runtime"><dt><a href="/pkg/runtime/">runtime</a></dt>
+<dl id="pkg-runtime"><dt><a href="/pkg/runtime/">runtime</a></dt>
   <dd>
     <p><!-- CL 37233, CL 37726 -->
       Tracebacks generated by the runtime and recorded in profiles are
diff --git a/src/internal/bytealg/indexbyte_riscv64.s b/src/internal/bytealg/indexbyte_riscv64.s
index 087be86..156c303 100644
--- a/src/internal/bytealg/indexbyte_riscv64.s
+++ b/src/internal/bytealg/indexbyte_riscv64.s
@@ -6,8 +6,8 @@
 #include "textflag.h"
 
 TEXT ·IndexByte(SB),NOSPLIT,$0-40
-	MOV	s+0(FP), A1
-	MOV	s_len+8(FP), A2
+	MOV	b_base+0(FP), A1
+	MOV	b_len+8(FP), A2
 	MOVBU	c+24(FP), A3	// byte to find
 	MOV	A1, A4		// store base for later
 	ADD	A1, A2		// end
@@ -29,8 +29,8 @@
 	RET
 
 TEXT ·IndexByteString(SB),NOSPLIT,$0-32
-	MOV	p+0(FP), A1
-	MOV	b_len+8(FP), A2
+	MOV	s_base+0(FP), A1
+	MOV	s_len+8(FP), A2
 	MOVBU	c+16(FP), A3	// byte to find
 	MOV	A1, A4		// store base for later
 	ADD	A1, A2		// end
diff --git a/src/net/lookup_test.go b/src/net/lookup_test.go
index 1663b78..2bc5592 100644
--- a/src/net/lookup_test.go
+++ b/src/net/lookup_test.go
@@ -1179,12 +1179,9 @@
 	}
 }
 
-// Issue 31586: don't crash on null byte in name
+// Issue 31597: don't panic on null byte in name
 func TestLookupNullByte(t *testing.T) {
 	testenv.MustHaveExternalNetwork(t)
 	testenv.SkipFlakyNet(t)
-	_, err := LookupHost("foo\x00bar") // used to crash on Windows
-	if err == nil {
-		t.Errorf("unexpected success")
-	}
+	LookupHost("foo\x00bar") // check that it doesn't panic; it used to on Windows
 }
diff --git a/src/runtime/signal_unix.go b/src/runtime/signal_unix.go
index 3861cac..d2e6693 100644
--- a/src/runtime/signal_unix.go
+++ b/src/runtime/signal_unix.go
@@ -412,6 +412,16 @@
 			sigprofNonGoPC(c.sigpc())
 			return
 		}
+		if sig == sigPreempt && preemptMSupported && debug.asyncpreemptoff == 0 {
+			// This is probably a signal from preemptM sent
+			// while executing Go code but received while
+			// executing non-Go code.
+			// We got past sigfwdgo, so we know that there is
+			// no non-Go signal handler for sigPreempt.
+			// The default behavior for sigPreempt is to ignore
+			// the signal, so badsignal will be a no-op anyway.
+			return
+		}
 		c.fixsigcode(sig)
 		badsignal(uintptr(sig), c)
 		return