[LSan] Ignore all allocations made inside pthread_create.

Thread stack/TLS may be stored by libpthread for future reuse after
thread destruction, and the linked list it's stored in doesn't
even hold valid pointers to the objects, the latter are calculated
by obscure pointer arithmetic.

With this change applied, LSan test suite passes with
"use_ld_allocations" flag defaulted to "false". It still requires more
testing to check if the default can be switched.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@257975 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 1 deletions

diff --git a/lib/asan/asan_interceptors.cc b/lib/asan/asan_interceptors.cc
index d9a0c71a0..712b6b92d 100644
--- a/lib/asan/asan_interceptors.cc
+++ b/lib/asan/asan_interceptors.cc
@@ -21,6 +21,7 @@
 #include "asan_stack.h"
 #include "asan_stats.h"
 #include "asan_suppressions.h"
+#include "lsan/lsan_common.h"
 #include "sanitizer_common/sanitizer_libc.h"
 
 #if SANITIZER_POSIX
@@ -242,7 +243,17 @@ INTERCEPTOR(int, pthread_create, void *thread,
   ThreadStartParam param;
   atomic_store(&param.t, 0, memory_order_relaxed);
   atomic_store(&param.is_registered, 0, memory_order_relaxed);
-  int result = REAL(pthread_create)(thread, attr, asan_thread_start, &param);
+  int result;
+  {
+    // Ignore all allocations made by pthread_create: thread stack/TLS may be
+    // stored by pthread for future reuse even after thread destruction, and
+    // the linked list it's stored in doesn't even hold valid pointers to the
+    // objects, the latter are calculated by obscure pointer arithmetic.
+#if CAN_SANITIZE_LEAKS
+    __lsan::ScopedInterceptorDisabler disabler;
+#endif
+    result = REAL(pthread_create)(thread, attr, asan_thread_start, &param);
+  }
   if (result == 0) {
     u32 current_tid = GetCurrentTidOrInvalid();
     AsanThread *t =