[TSAN] Fix tsan on FreeBSD after D54889

Summary:
It appears that since https://reviews.llvm.org/D54889, BackgroundThread()
crashes immediately because cur_thread()-> will return a null pointer
which is then dereferenced. I'm not sure why I only see this issue on
FreeBSD and not Linux since it should also be unintialized on other platforms.

Reviewers: yuri, dvyukov, dim, emaste

Subscribers: kubamracek, krytarowski, #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D65705

llvm-svn: 368103

2 files changed, 2 insertions, 1 deletions

diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp b/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp
index 312d00c6f92..1ac3907094b 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp
@@ -149,6 +149,7 @@ static void BackgroundThread(void *arg) {
   // We don't use ScopedIgnoreInterceptors, because we want ignores to be
   // enabled even when the thread function exits (e.g. during pthread thread
   // shutdown code).
+  cur_thread_init();
   cur_thread()->ignore_interceptors++;
   const u64 kMs2Ns = 1000 * 1000;
 
diff --git a/compiler-rt/test/tsan/ignored-interceptors-mmap.cpp b/compiler-rt/test/tsan/ignored-interceptors-mmap.cpp
index bb43250a659..bcfafa40991 100644
--- a/compiler-rt/test/tsan/ignored-interceptors-mmap.cpp
+++ b/compiler-rt/test/tsan/ignored-interceptors-mmap.cpp
@@ -1,7 +1,7 @@
 // RUN: %clangxx_tsan -O0 %s -o %t
 // RUN: not %run %t        2>&1 | FileCheck %s --check-prefix=CHECK-RACE
 // RUN:     %run %t ignore 2>&1 | FileCheck %s --check-prefix=CHECK-IGNORE
-// XFAIL: freebsd,netbsd
+// XFAIL: netbsd
 
 #include <sys/mman.h>
 #include <string.h>