diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index ec4be31db3..764f12769e 100644
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -4619,7 +4619,7 @@ func sigprof(pc, sp, lr uintptr, gp *g, mp *m) {
 		return
 	}
 
-	// On mips{,le}, 64bit atomics are emulated with spinlocks, in
+	// On mips{,le}/arm, 64bit atomics are emulated with spinlocks, in
 	// runtime/internal/atomic. If SIGPROF arrives while the program is inside
 	// the critical section, it creates a deadlock (when writing the sample).
 	// As a workaround, create a counter of SIGPROFs while in critical section
@@ -4632,6 +4632,13 @@ func sigprof(pc, sp, lr uintptr, gp *g, mp *m) {
 				return
 			}
 		}
+		if GOARCH == "arm" && goarm < 7 && GOOS == "linux" && pc&0xffff0000 == 0xffff0000 {
+			// runtime/internal/atomic functions call into kernel
+			// helpers on arm < 7. See
+			// runtime/internal/atomic/sys_linux_arm.s.
+			cpuprof.lostAtomic++
+			return
+		}
 	}
 
 	// Profiling runs concurrently with GC, so it must not allocate.