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// Test StopTheWorld behavior during signal storm.
// Historically StopTheWorld crashed because did not handle EINTR properly.
// The test is somewhat convoluted, but that's what caused crashes previously.
// RUN: %clangxx_asan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <time.h>
#include <pthread.h>
#include <sanitizer/lsan_interface.h>
static void handler(int signo);
static void *thr(void *arg);
int main() {
struct sigaction act = {};
act.sa_handler = handler;
sigaction(SIGPROF, &act, 0);
pid_t pid = fork();
if (pid < 0) {
fprintf(stderr, "failed to fork\n");
exit(1);
}
if (pid == 0) {
// Child constantly sends signals to parent to cause spurious return from
// waitpid in StopTheWorld.
prctl(PR_SET_PDEATHSIG, SIGTERM, 0, 0, 0);
pid_t parent = getppid();
for (;;) {
// There is no strong reason for these two particular signals,
// but at least one of them ought to unblock waitpid.
kill(parent, SIGCHLD);
kill(parent, SIGPROF);
}
}
usleep(10000); // Let the child start.
__lsan_do_leak_check();
// Kill and join the child.
kill(pid, SIGTERM);
waitpid(pid, 0, 0);
sleep(1); // If the tracer thread still runs, give it time to crash.
fprintf(stderr, "DONE\n");
// CHECK: DONE
}
static void handler(int signo) {
}
static void *thr(void *arg) {
for (;;)
sleep(1);
return 0;
}
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