compiler-rt/test/asan/TestCases/Linux/pthread_create_from_constructor.cpp

   1 // Test that ASan doesn't deadlock in __interceptor_pthread_create called
   2 // from dlopened shared library constructor. The deadlock happens only in shared
   3 // ASan runtime with recent Glibc (2.23 fits) when __interceptor_pthread_create
   4 // grabs global Glibc's GL(dl_load_lock) and waits for tls_get_addr_tail that
   5 // also tries to acquire it.
   6 //
   7 // RUN: %clangxx_asan -DBUILD_SO=1 -fPIC -shared %s -o %t-so.so
   8 // RUN: %clangxx_asan %s -o %t
   9 // RUN: %run %t 2>&1
  10
  11 // dlopen() can not be intercepted on Android
  12 // UNSUPPORTED: android
  13 // REQUIRES: x86-target-arch
  14
  15 #ifdef BUILD_SO
  16
  17 #include <stdio.h>
  18 #include <pthread.h>
  19 #include <unistd.h>
  20
  21 void *threadFn(void *) {
  22   fprintf(stderr, "thread started\n");
  23   while (true) {
  24     usleep(100000);
  25   }
  26   return 0;
  27 }
  28
  29 void __attribute__((constructor)) startPolling() {
  30   fprintf(stderr, "initializing library\n");
  31   pthread_t t;
  32   pthread_create(&t, 0, &threadFn, 0);
  33   fprintf(stderr, "done\n");
  34 }
  35
  36 #else
  37
  38 #include <dlfcn.h>
  39 #include <stdlib.h>
  40 #include <string>
  41
  42 int main(int argc, char **argv) {
  43   std::string path = std::string(argv[0]) + "-so.so";
  44   void *handle = dlopen(path.c_str(), RTLD_LAZY);
  45   if (!handle)
  46     abort();
  47   return 0;
  48 }
  49 #endif