diff --git a/CHANGELOG.md b/CHANGELOG.md
index 01c7d0ef6..1651f7ffb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ Blocks of changes will separated by version increments.
 
 ## **[Unreleased]**
 
+- [#790](https://github.com/wasmerio/wasmer/pull/790) Fix flaky test failure with LLVM, switch to large code model.
 - [#788](https://github.com/wasmerio/wasmer/pull/788) Use union merge on the changelog file.
 - [#785](https://github.com/wasmerio/wasmer/pull/785) Include Apache license file for spectests.
 - [#786](https://github.com/wasmerio/wasmer/pull/786) In the LLVM backend, lower atomic wasm operations to atomic machine instructions.
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index aad922544..fae1d39b5 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -50,6 +50,16 @@ jobs:
       - template: .azure/install-llvm.yml
       - template: .azure/install-sccache.yml
       - template: .azure/install-cmake.yml
+      - bash: |
+          hostname
+          uname -a
+        displayName: System info (*nix)
+        condition: and(succeeded(), not(eq(variables['Agent.OS'], 'Windows_NT')))
+      - bash: |
+          cat /proc/cpuinfo
+          cat /proc/meminfo
+        displayName: System info - Extended (Linux)
+        condition: and(succeeded(), eq(variables['Agent.OS'], 'Linux'))
       - bash: make test
         displayName: Tests (*nix)
         condition: and(succeeded(), not(eq(variables['Agent.OS'], 'Windows_NT')))
diff --git a/lib/llvm-backend/src/backend.rs b/lib/llvm-backend/src/backend.rs
index a0fb80c03..682bd7278 100644
--- a/lib/llvm-backend/src/backend.rs
+++ b/lib/llvm-backend/src/backend.rs
@@ -189,8 +189,8 @@ impl LLVMBackend {
                 &TargetMachine::get_host_cpu_name().to_string(),
                 &TargetMachine::get_host_cpu_features().to_string(),
                 OptimizationLevel::Aggressive,
-                RelocMode::PIC,
-                CodeModel::Default,
+                RelocMode::Static,
+                CodeModel::Large,
             )
             .unwrap();
 
diff --git a/lib/singlepass-backend/src/codegen_x64.rs b/lib/singlepass-backend/src/codegen_x64.rs
index e069dfeeb..a12b2557f 100644
--- a/lib/singlepass-backend/src/codegen_x64.rs
+++ b/lib/singlepass-backend/src/codegen_x64.rs
@@ -353,7 +353,7 @@ impl RunnableModule for X64ExecutionContext {
 
 #[derive(Debug)]
 pub struct CodegenError {
-    pub message: &'static str,
+    pub message: String,
 }
 
 #[derive(Copy, Clone, Debug)]
@@ -474,7 +474,7 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
                 Some(x) => x,
                 None => {
                     return Err(CodegenError {
-                        message: "label not found",
+                        message: format!("label not found"),
                     });
                 }
             };
@@ -482,7 +482,7 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
                 Some(x) => x,
                 None => {
                     return Err(CodegenError {
-                        message: "offset is none",
+                        message: format!("offset is none"),
                     });
                 }
             };
@@ -3873,7 +3873,11 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
                     returns: match ty {
                         WpTypeOrFuncType::Type(WpType::EmptyBlockType) => smallvec![],
                         WpTypeOrFuncType::Type(inner_ty) => smallvec![inner_ty],
-                        _ => panic!("multi-value returns not yet implemented"),
+                        _ => {
+                            return Err(CodegenError {
+                                message: format!("multi-value returns not yet implemented"),
+                            })
+                        }
                     },
                     value_stack_depth: self.value_stack.len(),
                     state: self.machine.state.clone(),
@@ -3980,7 +3984,11 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
                     returns: match ty {
                         WpTypeOrFuncType::Type(WpType::EmptyBlockType) => smallvec![],
                         WpTypeOrFuncType::Type(inner_ty) => smallvec![inner_ty],
-                        _ => panic!("multi-value returns not yet implemented"),
+                        _ => {
+                            return Err(CodegenError {
+                                message: format!("multi-value returns not yet implemented"),
+                            })
+                        }
                     },
                     value_stack_depth: self.value_stack.len(),
                     state: self.machine.state.clone(),
@@ -4005,7 +4013,11 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
                     returns: match ty {
                         WpTypeOrFuncType::Type(WpType::EmptyBlockType) => smallvec![],
                         WpTypeOrFuncType::Type(inner_ty) => smallvec![inner_ty],
-                        _ => panic!("multi-value returns not yet implemented"),
+                        _ => {
+                            return Err(CodegenError {
+                                message: format!("multi-value returns not yet implemented"),
+                            })
+                        }
                     },
                     value_stack_depth: self.value_stack.len(),
                     state: self.machine.state.clone(),
@@ -4966,7 +4978,9 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
                 }
             }
             _ => {
-                panic!("not yet implemented: {:?}", op);
+                return Err(CodegenError {
+                    message: format!("not yet implemented: {:?}", op),
+                });
             }
         }
 
diff --git a/lib/spectests/tests/excludes.txt b/lib/spectests/tests/excludes.txt
index 2f077f559..118e2520a 100644
--- a/lib/spectests/tests/excludes.txt
+++ b/lib/spectests/tests/excludes.txt
@@ -862,6 +862,7 @@ llvm:skip:unreachable.wast:*:windows
 llvm:skip:unwind.wast:*:windows
 
 # LLVM Linux after OSR - https://github.com/wasmerio/wasmer/pull/567
+llvm:skip:simd.wast:352:unix # Module - caught panic Any
 llvm:skip:simd.wast:355:unix # Module - caught panic Any
 llvm:skip:simd_binaryen.wast:*:unix # Module - caught panic Any