// https://syzkaller.appspot.com/bug?id=401730da81cc65b97da6fa48aa9c0d392463f1b5
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void exitf(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit(kRetryStatus);
}

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);

  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

static int inject_fault(int nth)
{
  int fd;
  char buf[16];

  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exitf("failed to open /proc/thread-self/fail-nth");
  sprintf(buf, "%d", nth + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exitf("failed to write /proc/thread-self/fail-nth");
  return fd;
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0x1e, 2, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint16_t*)0x20d80f80 = 0x1e;
    memcpy((void*)0x20d80f82,
           "\x01\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x09\xa9\x79\xf3\x21\xb3\x0c\x7b\xc8\x79\x04\x05\xc7\xba\xd6\x2e"
           "\x0a\x43\xa6\x32\xed\x49\x38\xd3\x6d\x73\xfb\x8f\x84\x01\xa3\xff"
           "\x59\x82\x9a\x2b\x0a\xfe\x7c\xe4\x3a\x4b\x24\x70\xa0\xc5\x21\x66"
           "\x69\xca\x02\x1f\x6f\x65\xdc\xf1\x60\xe7\xe5\x8f\x35\x8c\x00\x02"
           "\xf0\x00\x01\x58\xd1\x9b\xcb\x31\xf1\x31\x4a\x8e\xf1\x51\x62\x2c"
           "\xa5\xbd\xb9\xc8\xea\xd2\x00\x00\x77\xae\xb8\x1c\x90\x00\x1d\x6d"
           "\x7c\x98\x0e\xe5\x90\xc8\xb9\xf7\x0d\xc1\x36\xcb\x18\x4a",
           126);
    syscall(__NR_bind, r[0], 0x20d80f80, 0x80);
    break;
  case 2:
    *(uint16_t*)0x20afb000 = 0x1e;
    memcpy((void*)0x20afb002,
           "\x01\x03\x00\x00\x00\x00\x00\xb9\x00\x00\x00\x00\x47\x00\x00\x00"
           "\x00\xa9\x79\xf3\x21\xb3\x0c\x7b\xc8\x79\x04\x05\xc7\xba\xd6\x2e"
           "\x0a\x63\xa6\x32\xed\x49\x38\xd3\x6d\x73\xfb\x8f\x84\x01\xa3\xff"
           "\x59\x82\x9a\x2b\x0a\xfe\x7c\xe4\x3a\x4b\x24\x70\xa0\xc5\x21\x66"
           "\x69\xca\x02\x1f\x6f\x65\xdc\xf1\x60\xe7\xe5\x8f\x35\x8c\x00\x02"
           "\xf0\x00\x01\x58\xd1\x9b\xcb\x31\x51\xd2\x4a\xce\xf1\xf1\x62\x2c"
           "\xa5\xbd\xb9\xc8\xea\x31\x00\x00\x77\xae\xb8\x1c\x90\x00\x1d\x6d"
           "\x7c\x98\x04\x00\x00\x00\x00\xf7\x0d\xc1\x36\xcb\x18\x4a",
           126);
    write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
    write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
    inject_fault(0);
    syscall(__NR_bind, r[0], 0x20afb000, 0x80);
    break;
  }
}

void loop()
{
  execute(3);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}