fix(ci): clear LD_PRELOAD before AOTInductor compilation

LSAN runtime inherited by g++ subprocesses causes false leak reports
and non-zero exit codes, making torch._inductor think no C++ compiler
works. Clear LD_PRELOAD after custom ops are loaded since it's no
longer needed.

Author: Han Wang

source/tests/infer/gen_dpa1.py

@@ -37,6 +37,9 @@ def _ensure_inductor_compiler():
         if fallback not in search and shutil.which(fallback):
             search.append(fallback)
     inductor_config.cpp.cxx = tuple(search)
+    # Clear LD_PRELOAD so compiler subprocesses don't inherit the LSAN runtime,
+    # which causes false leak reports and non-zero exit codes in g++.
+    os.environ.pop("LD_PRELOAD", None)
 
 
 def _load_custom_ops():

source/tests/infer/gen_dpa2.py

@@ -37,6 +37,9 @@ def _ensure_inductor_compiler():
         if fallback not in search and shutil.which(fallback):
             search.append(fallback)
     inductor_config.cpp.cxx = tuple(search)
+    # Clear LD_PRELOAD so compiler subprocesses don't inherit the LSAN runtime,
+    # which causes false leak reports and non-zero exit codes in g++.
+    os.environ.pop("LD_PRELOAD", None)
 
 
 def _load_custom_ops():

source/tests/infer/gen_dpa3.py

@@ -37,6 +37,9 @@ def _ensure_inductor_compiler():
         if fallback not in search and shutil.which(fallback):
             search.append(fallback)
     inductor_config.cpp.cxx = tuple(search)
+    # Clear LD_PRELOAD so compiler subprocesses don't inherit the LSAN runtime,
+    # which causes false leak reports and non-zero exit codes in g++.
+    os.environ.pop("LD_PRELOAD", None)
 
 
 def _load_custom_ops():

source/tests/infer/gen_fparam_aparam.py

@@ -37,6 +37,9 @@ def _ensure_inductor_compiler():
         if fallback not in search and shutil.which(fallback):
             search.append(fallback)
     inductor_config.cpp.cxx = tuple(search)
+    # Clear LD_PRELOAD so compiler subprocesses don't inherit the LSAN runtime,
+    # which causes false leak reports and non-zero exit codes in g++.
+    os.environ.pop("LD_PRELOAD", None)
 
 
 def _load_custom_ops():

source/tests/infer/gen_sea.py

@@ -33,6 +33,9 @@ def _ensure_inductor_compiler():
         if fallback not in search and shutil.which(fallback):
             search.append(fallback)
     inductor_config.cpp.cxx = tuple(search)
+    # Clear LD_PRELOAD so compiler subprocesses don't inherit the LSAN runtime,
+    # which causes false leak reports and non-zero exit codes in g++.
+    os.environ.pop("LD_PRELOAD", None)
 
 
 def _load_custom_ops():