[asan] Remove "COLLISION" workaround for datarace in asan

"nested bug in the same thread" is not expected in case like this and was caused
by google/sanitizers#858

llvm-svn=313844

compiler-rt/test/asan/TestCases/Posix/halt_on_error-torture.cc

@@ -3,17 +3,16 @@
 // RUN: %clangxx_asan -fsanitize-recover=address -pthread %s -o %t
 //
 // RUN: %env_asan_opts=halt_on_error=false:suppress_equal_pcs=false %run %t 1 10 >%t.log 2>&1
-// RUN: FileCheck %s <%t.log
 // RUN: grep 'ERROR: AddressSanitizer: use-after-poison' %t.log | count 10
-// RUN: FileCheck --check-prefix=CHECK-NO-COLLISION %s <%t.log
+// RUN: FileCheck %s <%t.log
 //
-// Collisions are unlikely but still possible so we need the ||.
-// RUN: %env_asan_opts=halt_on_error=false:suppress_equal_pcs=false:exitcode=0 %run %t 10 20 >%t.log 2>&1
-// RUN: FileCheck --check-prefix=CHECK-COLLISION %s <%t.log || FileCheck --check-prefix=CHECK-NO-COLLISION %s <%t.log
+// RUN: %env_asan_opts=halt_on_error=false:suppress_equal_pcs=false:exitcode=0 %run %t 10 20 >%t.log 2>&1 
+// RUN: grep 'ERROR: AddressSanitizer: use-after-poison' %t.log | count 200
+// RUN: FileCheck %s <%t.log
 //
-// Collisions are unlikely but still possible so we need the ||.
-// RUN: %env_asan_opts=halt_on_error=false:exitcode=0 %run %t 10 20 >%t.log 2>&1
-// RUN: FileCheck --check-prefix=CHECK-COLLISION %s <%t.log || FileCheck --check-prefix=CHECK-NO-COLLISION %s <%t.log
+// RUN: %env_asan_opts=halt_on_error=false:exitcode=0 %run %t 10 20 >%t.log 2>&1 
+// RUN: grep 'ERROR: AddressSanitizer: use-after-poison' %t.log | count 1
+// RUN: FileCheck %s <%t.log
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -39,7 +38,6 @@ void *run(void *arg) {
 
   for (size_t i = 0; i < niter; ++i) {
     random_delay(&seed);
-    // Expect error collisions here
     // CHECK: ERROR: AddressSanitizer: use-after-poison
     volatile int idx = 0;
     tmp[idx] = 0;
@@ -73,8 +71,7 @@ int main(int argc, char **argv) {
     }
   }
 
-  // CHECK-COLLISION: AddressSanitizer: nested bug in the same thread, aborting
-  // CHECK-NO-COLLISION: All threads terminated
+  // CHECK: All threads terminated
   printf("All threads terminated\n");
 
   delete [] tids;