Rollup merge of rust-lang#65102 - tmiasko:tsan-probe-stack, r=alexcrichton

Disable stack probe when thread sanitizer is enabled

When thread sanitizer instrumentation is enabled during compilation of
stack probe function, the function will be miscompiled and trigger
segmentation fault at runtime. Disable stack probes when tsan is
enabled.

Author: Centril

src/librustc_codegen_llvm/attributes.rs

@@ -96,10 +96,12 @@ pub fn set_probestack(cx: &CodegenCx<'ll, '_>, llfn: &'ll Value) {
     }
 
     // Currently stack probes seem somewhat incompatible with the address
-    // sanitizer. With asan we're already protected from stack overflow anyway
-    // so we don't really need stack probes regardless.
-    if let Some(Sanitizer::Address) = cx.sess().opts.debugging_opts.sanitizer {
-        return
+    // sanitizer and thread sanitizer. With asan we're already protected from
+    // stack overflow anyway so we don't really need stack probes regardless.
+    match cx.sess().opts.debugging_opts.sanitizer {
+        Some(Sanitizer::Address) |
+        Some(Sanitizer::Thread) => return,
+        _ => {},
     }
 
     // probestack doesn't play nice either with `-C profile-generate`.