[msan][NFCI] Add note that GPU libraries may cause shadow mapping incompatibility

[thurstond]

GPU libraries may map a significant chunk of host memory that overlaps with the expected shadow mappings

[llvmbot]

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Thurston Dang (thurstond)

Changes

…ompatibility

---

Full diff: https://github.com/llvm/llvm-project/pull/137834.diff

1 Files Affected:

• (modified) compiler-rt/lib/msan/msan.cpp (+3)

diff --git a/compiler-rt/lib/msan/msan.cpp b/compiler-rt/lib/msan/msan.cpp
index a3c0c2e485af3..0361630b54f97 100644
--- a/compiler-rt/lib/msan/msan.cpp
+++ b/compiler-rt/lib/msan/msan.cpp
@@ -483,6 +483,9 @@ void __msan_init() {
     Printf("FATAL: Disabling ASLR is known to cause this error.\n");
     Printf("FATAL: If running under GDB, try "
            "'set disable-randomization off'.\n");
+    Printf(
+        "FATAL: This error may also occur for programs that use GPU "
+        "libraries.\n");
     DumpProcessMap();
     Die();
   }