Revert "[compiler-rt] Also consider SIGPROF as a synchronous signal" (#86416)

Reverting #85188 with follow up patches.

This reverts commit 362d263.
This reverts commit c9bdeab.
This reverts commit 6bc6e1a.
This reverts commit 01fa550.
This reverts commit ddcbab3.

Author: vitalybuka

compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp

@@ -126,7 +126,6 @@ const int SIGFPE = 8;
 const int SIGSEGV = 11;
 const int SIGPIPE = 13;
 const int SIGTERM = 15;
-const int SIGPROF = 27;
 #if defined(__mips__) || SANITIZER_FREEBSD || SANITIZER_APPLE || SANITIZER_NETBSD
 const int SIGBUS = 10;
 const int SIGSYS = 12;
@@ -2180,8 +2179,7 @@ void sighandler(int sig, __sanitizer_siginfo *info, void *ctx) {
     return;
   }
   // Don't mess with synchronous signals.
-  const bool sync = is_sync_signal(sctx, sig, info) ||
-                    (sig == SIGPROF && thr->is_inited && !thr->is_dead);
+  const bool sync = is_sync_signal(sctx, sig, info);
   if (sync ||
       // If we are in blocking function, we can safely process it now
       // (but check if we are in a recursive interceptor,

compiler-rt/test/tsan/signal_errno.cpp

@@ -18,7 +18,7 @@ static void MyHandler(int, siginfo_t *s, void *c) {
 
 static void* sendsignal(void *p) {
   barrier_wait(&barrier);
-  pthread_kill(mainth, SIGALRM);
+  pthread_kill(mainth, SIGPROF);
   return 0;
 }
 
@@ -37,7 +37,7 @@ int main() {
   mainth = pthread_self();
   struct sigaction act = {};
   act.sa_sigaction = &MyHandler;
-  sigaction(SIGALRM, &act, 0);
+  sigaction(SIGPROF, &act, 0);
   pthread_t th;
   pthread_create(&th, 0, sendsignal, 0);
   loop();
@@ -46,7 +46,7 @@ int main() {
 }
 
 // CHECK: WARNING: ThreadSanitizer: signal handler spoils errno
-// CHECK:   Signal 14 handler invoked at:
+// CHECK:   Signal 27 handler invoked at:
 // CHECK:     #0 MyHandler(int, {{(__)?}}siginfo{{(_t)?}}*, void*) {{.*}}signal_errno.cpp
 // CHECK:     main
 // CHECK: SUMMARY: ThreadSanitizer: signal handler spoils errno{{.*}}MyHandler

compiler-rt/test/tsan/signal_reset.cpp

@@ -28,12 +28,12 @@ static void* reset(void *p) {
   struct sigaction act = {};
   for (int i = 0; i < 1000000; i++) {
     act.sa_handler = &handler;
-    if (sigaction(SIGALRM, &act, 0)) {
+    if (sigaction(SIGPROF, &act, 0)) {
       perror("sigaction");
       exit(1);
     }
     act.sa_handler = SIG_IGN;
-    if (sigaction(SIGALRM, &act, 0)) {
+    if (sigaction(SIGPROF, &act, 0)) {
       perror("sigaction");
       exit(1);
     }
@@ -44,7 +44,7 @@ static void* reset(void *p) {
 int main() {
   struct sigaction act = {};
   act.sa_handler = SIG_IGN;
-  if (sigaction(SIGALRM, &act, 0)) {
+  if (sigaction(SIGPROF, &act, 0)) {
     perror("sigaction");
     exit(1);
   }
@@ -53,7 +53,7 @@ int main() {
   t.it_value.tv_sec = 0;
   t.it_value.tv_usec = 10;
   t.it_interval = t.it_value;
-  if (setitimer(ITIMER_REAL, &t, 0)) {
+  if (setitimer(ITIMER_PROF, &t, 0)) {
     perror("setitimer");
     exit(1);
   }

compiler-rt/test/tsan/signal_sync.cpp

@@ -30,7 +30,7 @@ int main() {
 
   struct sigaction act = {};
   act.sa_handler = &handler;
-  if (sigaction(SIGVTALRM, &act, 0)) {
+  if (sigaction(SIGPROF, &act, 0)) {
     perror("sigaction");
     exit(1);
   }
@@ -39,7 +39,7 @@ int main() {
   t.it_value.tv_sec = 0;
   t.it_value.tv_usec = 10;
   t.it_interval = t.it_value;
-  if (setitimer(ITIMER_VIRTUAL, &t, 0)) {
+  if (setitimer(ITIMER_PROF, &t, 0)) {
     perror("setitimer");
     exit(1);
   }

compiler-rt/test/tsan/signal_thread.cpp

@@ -24,7 +24,7 @@ static void* thr(void *p) {
 int main() {
   struct sigaction act = {};
   act.sa_handler = &handler;
-  if (sigaction(SIGVTALRM, &act, 0)) {
+  if (sigaction(SIGPROF, &act, 0)) {
     perror("sigaction");
     exit(1);
   }
@@ -33,7 +33,7 @@ int main() {
   t.it_value.tv_sec = 0;
   t.it_value.tv_usec = 10;
   t.it_interval = t.it_value;
-  if (setitimer(ITIMER_VIRTUAL, &t, 0)) {
+  if (setitimer(ITIMER_PROF, &t, 0)) {
     perror("setitimer");
     exit(1);
   }

compiler-rt/test/tsan/signal_thread2.cpp

@@ -40,7 +40,7 @@ static void *thr(void *p) {
 int main() {
   struct sigaction act = {};
   act.sa_handler = &handler;
-  if (sigaction(SIGALRM, &act, 0)) {
+  if (sigaction(SIGPROF, &act, 0)) {
     perror("sigaction");
     exit(1);
   }
@@ -49,7 +49,7 @@ int main() {
   t.it_value.tv_sec = 0;
   t.it_value.tv_usec = 10;
   t.it_interval = t.it_value;
-  if (setitimer(ITIMER_REAL, &t, 0)) {
+  if (setitimer(ITIMER_PROF, &t, 0)) {
     perror("setitimer");
     exit(1);
   }