// https://syzkaller.appspot.com/bug?id=de316389db0fa0cd7ced6e564601ea8e56625ebc
// 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);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

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;
      }
    }
  }
}

#ifndef __NR_connect
#define __NR_connect 362
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#ifndef __NR_setsockopt
#define __NR_setsockopt 366
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[2];
uint64_t procid;
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, 0xa, 2, 0);
    break;
  case 2:
    *(uint32_t*)0x20b7fffc = 2;
    syscall(__NR_setsockopt, r[0], 0x29, 1, 0x20b7fffc, 4);
    break;
  case 3:
    *(uint16_t*)0x20e6f000 = 0xa;
    *(uint16_t*)0x20e6f002 = htobe16(0x4e22 + procid * 4);
    *(uint32_t*)0x20e6f004 = 0;
    *(uint8_t*)0x20e6f008 = 0;
    *(uint8_t*)0x20e6f009 = 0;
    *(uint8_t*)0x20e6f00a = 0;
    *(uint8_t*)0x20e6f00b = 0;
    *(uint8_t*)0x20e6f00c = 0;
    *(uint8_t*)0x20e6f00d = 0;
    *(uint8_t*)0x20e6f00e = 0;
    *(uint8_t*)0x20e6f00f = 0;
    *(uint8_t*)0x20e6f010 = 0;
    *(uint8_t*)0x20e6f011 = 0;
    *(uint8_t*)0x20e6f012 = -1;
    *(uint8_t*)0x20e6f013 = -1;
    *(uint8_t*)0x20e6f014 = 0xac;
    *(uint8_t*)0x20e6f015 = 0x14;
    *(uint8_t*)0x20e6f016 = 0 + procid * 1;
    *(uint8_t*)0x20e6f017 = 0xaa;
    *(uint32_t*)0x20e6f018 = 1;
    syscall(__NR_connect, r[0], 0x20e6f000, 0x1c);
    break;
  case 4:
    r[1] = syscall(__NR_socket, 0x18, 1, 1);
    break;
  case 5:
    *(uint16_t*)0x205fafd2 = 0x18;
    *(uint32_t*)0x205fafd4 = 1;
    *(uint32_t*)0x205fafd8 = 0;
    *(uint32_t*)0x205fafdc = r[0];
    *(uint16_t*)0x205fafe0 = 2;
    *(uint16_t*)0x205fafe2 = htobe16(0x4e21 + procid * 4);
    *(uint32_t*)0x205fafe4 = htobe32(0xe0000002);
    *(uint8_t*)0x205fafe8 = 0;
    *(uint8_t*)0x205fafe9 = 0;
    *(uint8_t*)0x205fafea = 0;
    *(uint8_t*)0x205fafeb = 0;
    *(uint8_t*)0x205fafec = 0;
    *(uint8_t*)0x205fafed = 0;
    *(uint8_t*)0x205fafee = 0;
    *(uint8_t*)0x205fafef = 0;
    *(uint32_t*)0x205faff0 = 4;
    *(uint32_t*)0x205faff4 = 0;
    *(uint32_t*)0x205faff8 = 2;
    *(uint32_t*)0x205faffc = 0;
    syscall(__NR_connect, r[1], 0x205fafd2, 0x2e);
    break;
  case 6:
    *(uint8_t*)0x20b80fa2 = 0xaa;
    *(uint8_t*)0x20b80fa3 = 0xaa;
    *(uint8_t*)0x20b80fa4 = 0xaa;
    *(uint8_t*)0x20b80fa5 = 0xaa;
    *(uint8_t*)0x20b80fa6 = 0;
    *(uint8_t*)0x20b80fa7 = 0xaa;
    *(uint8_t*)0x20b80fa8 = 0xaa;
    *(uint8_t*)0x20b80fa9 = 0xaa;
    *(uint8_t*)0x20b80faa = 0xaa;
    *(uint8_t*)0x20b80fab = 0xaa;
    *(uint8_t*)0x20b80fac = 0;
    *(uint8_t*)0x20b80fad = 0xaa;
    *(uint16_t*)0x20b80fae = htobe16(0x800);
    STORE_BY_BITMASK(uint8_t, 0x20b80fb0, 5, 0, 4);
    STORE_BY_BITMASK(uint8_t, 0x20b80fb0, 4, 4, 4);
    STORE_BY_BITMASK(uint8_t, 0x20b80fb1, 0, 0, 2);
    STORE_BY_BITMASK(uint8_t, 0x20b80fb1, 0, 2, 6);
    *(uint16_t*)0x20b80fb2 = htobe16(0x1c);
    *(uint16_t*)0x20b80fb4 = 0;
    *(uint16_t*)0x20b80fb6 = htobe16(0);
    *(uint8_t*)0x20b80fb8 = 0;
    *(uint8_t*)0x20b80fb9 = 0x2f;
    *(uint16_t*)0x20b80fba = 0;
    *(uint8_t*)0x20b80fbc = 0xac;
    *(uint8_t*)0x20b80fbd = 0x14;
    *(uint8_t*)0x20b80fbe = 0;
    *(uint8_t*)0x20b80fbf = 0xbb;
    *(uint32_t*)0x20b80fc0 = htobe32(0);
    *(uint8_t*)0x20b80fc4 = 0xa1;
    *(uint8_t*)0x20b80fc5 = 0;
    *(uint16_t*)0x20b80fc6 = 0;
    *(uint32_t*)0x20b80fc8 = htobe32(0xe0000001);
    *(uint32_t*)0x20754000 = 0;
    *(uint32_t*)0x20754004 = 1;
    *(uint32_t*)0x20754008 = 0;
    struct csum_inet csum_1;
    csum_inet_init(&csum_1);
    csum_inet_update(&csum_1, (const uint8_t*)0x20b80fc4, 8);
    *(uint16_t*)0x20b80fc6 = csum_inet_digest(&csum_1);
    struct csum_inet csum_2;
    csum_inet_init(&csum_2);
    csum_inet_update(&csum_2, (const uint8_t*)0x20b80fb0, 20);
    *(uint16_t*)0x20b80fba = csum_inet_digest(&csum_2);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(7);
  collide = 1;
  execute(7);
}

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