[TSAN] Relax the expected output of race_on_mutex.c

[slthakur]

Summary

The stack trace produced by TSan on MIPS is:

  Previous write of size 8 at 0x0120ed2930 by thread T1:
    #0 memset
/home/slt/LLVM/llvm/projects/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc:678
(race_on_mutex.c.tmp+0x0120071808)
    #1 __GI___pthread_mutex_init
/build/glibc-g99ldr/glibc-2.19/nptl/pthread_mutex_init.c:84
(libpthread.so.0+0x000000d634)
    #2 <null>
/home/slt/LLVM/llvm/projects/compiler-rt/test/tsan/race_on_mutex.c:11 (race_on_mutex.c.tmp+0x01200ea59c)

[slthakur]

Hi @samsonov, @dvyukov

Could you please find some time to review this?

[dvyukov]

LGTM

[slthakur]

Committed in revision 263778

test/tsan/race_on_mutex.c

 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
 // This test fails when run on powerpc64 (VMA=46).
 // The size of the write reported by Tsan for T1 is 8 instead of 1.
 // XFAIL: powerpc64
-// This test expects pthread_mutex_init in the frame #0 of thread T1 but we
-// get memset at frame #0 because memset that is called from pthread_init_mutex
-// is being intercepted by TSan
-// XFAIL: mips64
 #include "test.h"
 
 pthread_mutex_t Mtx;
 int Global;
 
 void *Thread2(void *x) {
   barrier_wait(&barrier);
 // CHECK:      WARNING: ThreadSanitizer: data race
 // CHECK-NEXT:   Atomic read of size 1 at {{.*}} by thread T2:
 // CHECK-NEXT:     #0 pthread_mutex_lock
 // CHECK-NEXT:     #1 Thread2{{.*}} {{.*}}race_on_mutex.c:[[@LINE+1]]{{(:3)?}} ({{.*}})
   pthread_mutex_lock(&Mtx);
   Global = 43;
   pthread_mutex_unlock(&Mtx);
   return NULL;
 }
 
 void *Thread1(void *x) {
-// CHECK:        Previous write of size 1 at {{.*}} by thread T1:
-// CHECK-NEXT:     #0 pthread_mutex_init {{.*}} ({{.*}})
-// CHECK-NEXT:     #1 Thread1{{.*}} {{.*}}race_on_mutex.c:[[@LINE+1]]{{(:3)?}} ({{.*}})
+// CHECK:        Previous write of size {{[0-9]+}} at {{.*}} by thread T1:
+// CHECK:          #{{[0-9]+}} {{.*}}pthread_mutex_init {{.*}} ({{.*}})
+// CHECK-NEXT:     #{{[0-9]+}} Thread1{{.*}} {{.*}}race_on_mutex.c:[[@LINE+1]]{{(:3)?}} ({{.*}})
   pthread_mutex_init(&Mtx, 0);
   pthread_mutex_lock(&Mtx);
   Global = 42;
   pthread_mutex_unlock(&Mtx);
   barrier_wait(&barrier);
   return NULL;
 }