diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -1988,10 +1988,16 @@
                                   GlobalVariable::ExternalLinkage, nullptr,
                                   "__stack_chk_guard");
 
-    // FreeBSD has "__stack_chk_guard" defined externally on libc.so
+    // XXX -- needs more investigation
+    // FreeBSD userland has "__stack_chk_guard" defined externally on libc.so,
+    // so not dso_local. Kernel modules are compiled in freestanding mode, it
+    // can be considered dso_local. For unknown reasons set dso_local here
+    // breaks PPC64 userland binaries (see bug #51590).
+    // However, FreeBSD amd64 kernel and modules are broken if dso_local
+    // is not set here, while PCC64 kernel and modules are fine without it.
     if (TM.getRelocationModel() == Reloc::Static &&
         !TM.getTargetTriple().isWindowsGNUEnvironment() &&
-        !TM.getTargetTriple().isOSFreeBSD())
+        !(TM.getTargetTriple().isPPC64() && TM.getTargetTriple().isOSFreeBSD()))
       GV->setDSOLocal(true);
   }
 }