diff -up qtwebengine-everywhere-src-5.15.6/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc.1213452 qtwebengine-everywhere-src-5.15.6/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc
--- qtwebengine-everywhere-src-5.15.6/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc.1213452	2021-09-03 10:35:33.069779845 -0500
+++ qtwebengine-everywhere-src-5.15.6/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc	2021-09-03 10:36:43.891325411 -0500
@@ -172,6 +172,12 @@ ResultExpr EvaluateSyscallImpl(int fs_de
     return RestrictCloneToThreadsAndEPERMFork();
   }
 
+  // clone3 takes a pointer argument which we cannot examine, so return ENOSYS
+  // to force the libc to use clone. See https://crbug.com/1213452.
+  if (sysno == __NR_clone3) {
+    return Error(ENOSYS);
+  }
+
   if (sysno == __NR_fcntl)
     return RestrictFcntlCommands();