// https://syzkaller.appspot.com/bug?id=54f4ce6239e6e0d0d5583488421c6fa3ba7ed6b4
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdlib.h>
#include <sys/syscall.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 <stdlib.h>
#include <string.h>
#include <sys/stat.h>

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

static void fail(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((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static void use_temporary_dir()
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    fail("failed to mkdtemp");
  if (chmod(tmpdir, 0777))
    fail("failed to chmod");
  if (chdir(tmpdir))
    fail("failed to chdir");
}

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 int collide;

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);
        if (collide && call % 2)
          break;
        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;
      }
    }
  }
}

long r[1];
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    r[0] = syscall(__NR_socket, 0x10, 3, 6);
    break;
  case 2:
    *(uint64_t*)0x2000b000 = 0x2000f000;
    *(uint32_t*)0x2000b008 = 0xc;
    *(uint64_t*)0x2000b010 = 0x20008000;
    *(uint64_t*)0x2000b018 = 1;
    *(uint64_t*)0x2000b020 = 0;
    *(uint64_t*)0x2000b028 = 0;
    *(uint32_t*)0x2000b030 = 0;
    *(uint16_t*)0x2000f000 = 0x10;
    *(uint16_t*)0x2000f002 = 0;
    *(uint32_t*)0x2000f004 = 0;
    *(uint32_t*)0x2000f008 = 0;
    *(uint64_t*)0x20008000 = 0x2000bcc4;
    *(uint64_t*)0x20008008 = 0x138;
    *(uint32_t*)0x2000bcc4 = 0x138;
    *(uint16_t*)0x2000bcc8 = 0x10;
    *(uint16_t*)0x2000bcca = 0x713;
    *(uint32_t*)0x2000bccc = 0;
    *(uint32_t*)0x2000bcd0 = 0;
    *(uint8_t*)0x2000bcd4 = 0;
    *(uint8_t*)0x2000bcd5 = 0;
    *(uint8_t*)0x2000bcd6 = 0;
    *(uint8_t*)0x2000bcd7 = 0;
    *(uint8_t*)0x2000bcd8 = 0;
    *(uint8_t*)0x2000bcd9 = 0;
    *(uint8_t*)0x2000bcda = 0;
    *(uint8_t*)0x2000bcdb = 0;
    *(uint8_t*)0x2000bcdc = 0;
    *(uint8_t*)0x2000bcdd = 0;
    *(uint8_t*)0x2000bcde = 0;
    *(uint8_t*)0x2000bcdf = 0;
    *(uint8_t*)0x2000bce0 = 0;
    *(uint8_t*)0x2000bce1 = 0;
    *(uint8_t*)0x2000bce2 = 0;
    *(uint8_t*)0x2000bce3 = 0;
    *(uint32_t*)0x2000bce4 = htobe32(0xe0000002);
    *(uint16_t*)0x2000bcf4 = 0;
    *(uint16_t*)0x2000bcf6 = htobe16(0);
    *(uint16_t*)0x2000bcf8 = 0;
    *(uint16_t*)0x2000bcfa = htobe16(0);
    *(uint16_t*)0x2000bcfc = 0;
    *(uint8_t*)0x2000bcfe = 0;
    *(uint8_t*)0x2000bcff = 0;
    *(uint8_t*)0x2000bd00 = 0;
    *(uint32_t*)0x2000bd04 = 0;
    *(uint32_t*)0x2000bd08 = 0;
    *(uint32_t*)0x2000bd0c = htobe32(0x7f000001);
    *(uint32_t*)0x2000bd1c = 0;
    *(uint8_t*)0x2000bd20 = 0x6c;
    *(uint64_t*)0x2000bd24 = htobe64(0);
    *(uint64_t*)0x2000bd2c = htobe64(1);
    *(uint64_t*)0x2000bd34 = 0;
    *(uint64_t*)0x2000bd3c = 0;
    *(uint64_t*)0x2000bd44 = 0;
    *(uint64_t*)0x2000bd4c = 0;
    *(uint64_t*)0x2000bd54 = 0;
    *(uint64_t*)0x2000bd5c = 0;
    *(uint64_t*)0x2000bd64 = 0;
    *(uint64_t*)0x2000bd6c = 0;
    *(uint64_t*)0x2000bd74 = 0;
    *(uint64_t*)0x2000bd7c = 0;
    *(uint64_t*)0x2000bd84 = 0;
    *(uint64_t*)0x2000bd8c = 0;
    *(uint32_t*)0x2000bd94 = 0;
    *(uint32_t*)0x2000bd98 = 0;
    *(uint32_t*)0x2000bd9c = 0;
    *(uint32_t*)0x2000bda0 = 0;
    *(uint32_t*)0x2000bda4 = 0;
    *(uint16_t*)0x2000bda8 = 0xa;
    *(uint8_t*)0x2000bdaa = 1;
    *(uint8_t*)0x2000bdab = 0;
    *(uint8_t*)0x2000bdac = 0;
    *(uint16_t*)0x2000bdb4 = 0x48;
    *(uint16_t*)0x2000bdb6 = 3;
    memcpy((void*)0x2000bdb8,
           "\x64\x65\x66\x6c\x61\x74\x65\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf1\xff\xff\xff\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
           64);
    *(uint32_t*)0x2000bdf8 = 0;
    syscall(__NR_sendmsg, r[0], 0x2000b000, 0);
    break;
  }
}

void loop()
{
  memset(r, -1, sizeof(r));
  execute(3);
  collide = 1;
  execute(3);
}

int main()
{
  use_temporary_dir();
  loop();
  return 0;
}