diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
@@ -583,10 +583,11 @@
 bool RISCVAsmBackend::shouldInsertExtraNopBytesForCodeAlign(
     const MCAlignFragment &AF, unsigned &Size) {
   // Calculate Nops Size only when linker relaxation enabled.
-  if (!STI.getFeatureBits()[RISCV::FeatureRelax])
+  const MCSubtargetInfo *STI = AF.getSubtargetInfo();
+  if (!STI->getFeatureBits()[RISCV::FeatureRelax])
     return false;
 
-  bool HasStdExtC = STI.getFeatureBits()[RISCV::FeatureStdExtC];
+  bool HasStdExtC = STI->getFeatureBits()[RISCV::FeatureStdExtC];
   unsigned MinNopLen = HasStdExtC ? 2 : 4;
 
   if (AF.getAlignment() <= MinNopLen) {
@@ -606,7 +607,8 @@
                                                     const MCAsmLayout &Layout,
                                                     MCAlignFragment &AF) {
   // Insert the fixup only when linker relaxation enabled.
-  if (!STI.getFeatureBits()[RISCV::FeatureRelax])
+  const MCSubtargetInfo *STI = AF.getSubtargetInfo();
+  if (!STI->getFeatureBits()[RISCV::FeatureRelax])
     return false;
 
   // Calculate total Nops we need to insert. If there are none to insert
diff --git a/llvm/test/MC/RISCV/align-option-relax.s b/llvm/test/MC/RISCV/align-option-relax.s
new file mode 100644
--- /dev/null
+++ b/llvm/test/MC/RISCV/align-option-relax.s
@@ -0,0 +1,8 @@
+# RUN: llvm-mc -filetype=obj -triple riscv32 -mattr=-relax < %s \
+# RUN:     | llvm-readobj -r - | FileCheck %s
+
+# Check that .option relax overrides -mno-relax and enables R_RISCV_ALIGN
+# relocations.
+# CHECK: R_RISCV_ALIGN
+	.option relax
+	.align 4
diff --git a/llvm/test/MC/RISCV/align.s b/llvm/test/MC/RISCV/align.s
--- a/llvm/test/MC/RISCV/align.s
+++ b/llvm/test/MC/RISCV/align.s
@@ -112,3 +112,11 @@
 # C-EXT-RELAX-RELOC-NOT: R_RISCV_ALIGN
 data2:
 	.word 9
+# Check that the initial alignment is properly handled when using .option to
+# disable the C extension. This used to crash.
+# C-EXT-RELAX-INST:      <.text2>:
+# C-EXT-RELAX-INST-NEXT: add a0, a0, a1
+	.section .text2, "x"
+	.option norvc
+	.balign 4
+	add	a0, a0, a1