// https://syzkaller.appspot.com/bug?id=e65349bf521316a169c92614cbc68d53ac1f2bed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/futex.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <stdint.h>
#include <string.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 uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("loop fork failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
  }
}

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[3];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    memcpy((void*)0x203de000, "/dev/vhost-net", 15);
    r[0] = syscall(__NR_openat, 0xffffffffffffff9c, 0x203de000, 2, 0);
    break;
  case 2:
    r[1] = syscall(__NR_socket, 0x15, 7, 0);
    break;
  case 3:
    *(uint16_t*)0x2039b000 = 2;
    *(uint16_t*)0x2039b002 = htobe16(0x4e20 + procid * 4);
    *(uint32_t*)0x2039b004 = htobe32(0xe0000001);
    *(uint8_t*)0x2039b008 = 0;
    *(uint8_t*)0x2039b009 = 0;
    *(uint8_t*)0x2039b00a = 0;
    *(uint8_t*)0x2039b00b = 0;
    *(uint8_t*)0x2039b00c = 0;
    *(uint8_t*)0x2039b00d = 0;
    *(uint8_t*)0x2039b00e = 0;
    *(uint8_t*)0x2039b00f = 0;
    *(uint64_t*)0x2039b010 = 0;
    *(uint64_t*)0x2039b018 = 0;
    *(uint64_t*)0x2039b020 = 0;
    *(uint64_t*)0x2039b028 = 0;
    *(uint64_t*)0x2039b030 = 0;
    *(uint64_t*)0x2039b038 = 0;
    *(uint64_t*)0x2039b040 = 0;
    *(uint64_t*)0x2039b048 = 0;
    *(uint64_t*)0x2039b050 = 0;
    *(uint64_t*)0x2039b058 = 0;
    *(uint64_t*)0x2039b060 = 0;
    *(uint64_t*)0x2039b068 = 0;
    *(uint64_t*)0x2039b070 = 0;
    *(uint64_t*)0x2039b078 = 0;
    *(uint64_t*)0x2039b080 = 0;
    *(uint16_t*)0x2039b088 = 0xa;
    *(uint16_t*)0x2039b08a = htobe16(0x4e20 + procid * 4);
    *(uint32_t*)0x2039b08c = 0x60b4;
    *(uint8_t*)0x2039b090 = 0xfe;
    *(uint8_t*)0x2039b091 = 0x80;
    *(uint8_t*)0x2039b092 = 0;
    *(uint8_t*)0x2039b093 = 0;
    *(uint8_t*)0x2039b094 = 0;
    *(uint8_t*)0x2039b095 = 0;
    *(uint8_t*)0x2039b096 = 0;
    *(uint8_t*)0x2039b097 = 0;
    *(uint8_t*)0x2039b098 = 0;
    *(uint8_t*)0x2039b099 = 0;
    *(uint8_t*)0x2039b09a = 0;
    *(uint8_t*)0x2039b09b = 0;
    *(uint8_t*)0x2039b09c = 0;
    *(uint8_t*)0x2039b09d = 0;
    *(uint8_t*)0x2039b09e = 0 + procid * 1;
    *(uint8_t*)0x2039b09f = 0xbb;
    *(uint32_t*)0x2039b0a0 = 0x43b;
    *(uint64_t*)0x2039b0a8 = 0;
    *(uint64_t*)0x2039b0b0 = 0;
    *(uint64_t*)0x2039b0b8 = 0;
    *(uint64_t*)0x2039b0c0 = 0;
    *(uint64_t*)0x2039b0c8 = 0;
    *(uint64_t*)0x2039b0d0 = 0;
    *(uint64_t*)0x2039b0d8 = 0;
    *(uint64_t*)0x2039b0e0 = 0;
    *(uint64_t*)0x2039b0e8 = 0;
    *(uint64_t*)0x2039b0f0 = 0;
    *(uint64_t*)0x2039b0f8 = 0;
    *(uint64_t*)0x2039b100 = 0;
    *(uint16_t*)0x2039b108 = 1;
    *(uint16_t*)0x2039b10a = 1;
    *(uint32_t*)0x2039b10c = 4;
    memcpy((void*)0x2039b110,
           "\xd3\x56\x26\x1d\x02\xb5\xf0\x51\x70\xd8\x1e\x6b\xe4\x38\x62\xa6"
           "\xd8\x94\x30\x00\x7c\x85\xf3\x4d\xd1\x7c\xb1\xb3\x83\xcc\x3e\xdf"
           "\x7b\x8e\x4b\xf2\x53\xbf\x63\x44\xd9\xfa\x7c\xbe\x55\x3a\x92\x56"
           "\xf3\x27\xbb\x4d\xe5\x2d\x6f\x08\x5f\x75\x7e\x0a\x5b\xef\xc2\xad"
           "\x7e\x41\xc7\x68\x55\x56\x6e\x2f\x4f\x7b\x22\x4f\xdd\xe6\xb0\x64",
           80);
    syscall(__NR_setsockopt, r[1], 6, 0xe, 0x2039b000, 0x160);
    break;
  case 4:
    *(uint64_t*)0x201e3000 = 0;
    syscall(__NR_ioctl, r[0], 0xaf01, 0x201e3000);
    break;
  case 5:
    r[2] = syscall(__NR_eventfd, 0);
    break;
  case 6:
    *(uint32_t*)0x208ffff8 = 1;
    *(uint32_t*)0x208ffffc = r[2];
    syscall(__NR_ioctl, r[0], 0x4008af20, 0x208ffff8);
    break;
  case 7:
    syscall(__NR_ioctl, r[0], 0xaf02, 0);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(8);
  collide = 1;
  execute(8);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}