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// Test interaction of Asan recovery mode with asynch signals.
//
// RUN: %clang_asan -fsanitize-recover=address -pthread %s -o %t
//
// RUN: %env_asan_opts=halt_on_error=false:suppress_equal_pcs=false %run %t 100 >%t.log 2>&1 || true
// Collision will almost always get triggered but we still need to check the unlikely case:
// RUN: FileCheck --check-prefix=CHECK-COLLISION %s <%t.log || FileCheck --check-prefix=CHECK-NO-COLLISION %s <%t.log
#define _SVID_SOURCE 1 // SA_NODEFER
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <time.h>
#include <signal.h>
#include <sanitizer/asan_interface.h>
void random_delay(unsigned *seed) {
*seed = 1664525 * *seed + 1013904223;
struct timespec delay = { 0, (*seed % 1000) * 1000 };
nanosleep(&delay, 0);
}
volatile char bad[2] = {1, };
void error() {
// CHECK-COLLISION: AddressSanitizer: nested bug in the same thread, aborting
// CHECK-NO-COLLISION: AddressSanitizer: use-after-poison
volatile int idx = 0;
bad[idx] = 0;
}
#define CHECK_CALL(e, msg) do { \
if (0 != (e)) { \
fprintf(stderr, "Failed to " msg "\n"); \
exit(1); \
} \
} while (0)
size_t niter = 10;
pthread_t sender_tid, receiver_tid;
pthread_mutex_t keep_alive_mu = PTHREAD_MUTEX_INITIALIZER;
void *sender(void *arg) {
unsigned seed = 0;
for (size_t i = 0; i < niter; ++i) {
random_delay(&seed);
CHECK_CALL(pthread_kill(receiver_tid, SIGUSR1), "send signal");
}
return 0;
}
void handler(int sig) {
// Expect error collisions here
error();
}
void *receiver(void *arg) {
unsigned seed = 1;
for (size_t i = 0; i < niter; ++i) {
random_delay(&seed);
// And here
error();
}
// Parent will release this when it's ok to terminate
CHECK_CALL(pthread_mutex_lock(&keep_alive_mu), "unlock mutex");
return 0;
}
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Syntax: %s niter\n", argv[0]);
exit(1);
}
niter = (size_t)strtoul(argv[1], 0, 0);
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = handler;
sa.sa_flags = SA_NODEFER; // Enable nested handlers to add more stress
CHECK_CALL(sigaction(SIGUSR1, &sa, 0), "set sighandler");
__asan_poison_memory_region(&bad, sizeof(bad));
CHECK_CALL(pthread_mutex_lock(&keep_alive_mu), "lock mutex");
CHECK_CALL(pthread_create(&receiver_tid, 0, receiver, 0), "start thread");
CHECK_CALL(pthread_create(&sender_tid, 0, sender, 0), "start thread");
CHECK_CALL(pthread_join(sender_tid, 0), "join thread");
// Now allow receiver to die
CHECK_CALL(pthread_mutex_unlock(&keep_alive_mu), "unlock mutex");
CHECK_CALL(pthread_join(receiver_tid, 0), "join thread");
// CHECK-NO-COLLISION: All threads terminated
printf("All threads terminated\n");
return 0;
}
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