// https://syzkaller.appspot.com/bug?id=fb9c5979c8ee9be6c3cc6b58630d9becfdbbb0f7
// 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 <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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);
}

#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 __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  struct sigaction sa;

  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

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");
}

static void execute_one();
extern unsigned long long procid;

void loop()
{
  while (1) {
    execute_one();
  }
}

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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    NONFAILING(memcpy((void*)0x202ac000, "/dev/vhost-net", 15));
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x202ac000, 2, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    NONFAILING(*(uint64_t*)0x20c97ff8 = 0);
    syscall(__NR_ioctl, r[0], 0x40000000af01, 0x20c97ff8);
    break;
  case 2:
    NONFAILING(memcpy((void*)0x20000040, "/dev/audio", 11));
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000040, 0, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 3:
    syscall(__NR_close, r[1]);
    break;
  case 4:
    res = syscall(__NR_socket, 0x11, 3, 0x300);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    NONFAILING(*(uint32_t*)0x20b04000 = 0);
    NONFAILING(*(uint32_t*)0x20b04004 = 0);
    NONFAILING(*(uint64_t*)0x20b04008 = 0x20ae5f44);
    NONFAILING(*(uint64_t*)0x20b04010 = 0x20034000);
    NONFAILING(*(uint64_t*)0x20b04018 = 0x20ce1f30);
    NONFAILING(*(uint64_t*)0x20b04020 = 0);
    syscall(__NR_ioctl, r[0], 0x4028af11, 0x20b04000);
    break;
  case 6:
    syscall(__NR_read, r[2], 0x20000140, 0xd4);
    break;
  case 7:
    syscall(__NR_ioctl, r[0], 0x4008af03, 0x20ee1000);
    break;
  case 8:
    NONFAILING(*(uint32_t*)0x20d7c000 = 0);
    NONFAILING(*(uint32_t*)0x20d7c004 = r[1]);
    syscall(__NR_ioctl, r[0], 0x4008af30, 0x20d7c000);
    break;
  case 9:
    NONFAILING(*(uint32_t*)0x20000100 = 1);
    NONFAILING(*(uint32_t*)0x20000104 = 7);
    syscall(__NR_ioctl, r[0], 0x4008af23, 0x20000100);
    break;
  case 10:
    NONFAILING(*(uint8_t*)0x2037c000 = 1);
    NONFAILING(*(uint8_t*)0x2037c001 = 0x80);
    NONFAILING(*(uint8_t*)0x2037c002 = 0xc2);
    NONFAILING(*(uint8_t*)0x2037c003 = 0);
    NONFAILING(*(uint8_t*)0x2037c004 = 0);
    NONFAILING(*(uint8_t*)0x2037c005 = 0);
    NONFAILING(*(uint8_t*)0x2037c006 = 0);
    NONFAILING(*(uint8_t*)0x2037c007 = 0);
    NONFAILING(*(uint8_t*)0x2037c008 = 0x14);
    NONFAILING(*(uint8_t*)0x2037c009 = 0);
    NONFAILING(*(uint8_t*)0x2037c00a = 0);
    NONFAILING(*(uint8_t*)0x2037c00b = 0);
    NONFAILING(*(uint16_t*)0x2037c00c = htobe16(0x800));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2037c00e, 5, 0, 4));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2037c00e, 4, 4, 4));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2037c00f, 0, 0, 2));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2037c00f, 0, 2, 6));
    NONFAILING(*(uint16_t*)0x2037c010 = htobe16(0x1c));
    NONFAILING(*(uint16_t*)0x2037c012 = htobe16(-1));
    NONFAILING(*(uint16_t*)0x2037c014 = htobe16(0));
    NONFAILING(*(uint8_t*)0x2037c016 = 0);
    NONFAILING(*(uint8_t*)0x2037c017 = 0);
    NONFAILING(*(uint16_t*)0x2037c018 = 0);
    NONFAILING(*(uint32_t*)0x2037c01a = htobe32(0));
    NONFAILING(*(uint32_t*)0x2037c01e = htobe32(0));
    NONFAILING(*(uint16_t*)0x2037c022 = htobe16(0x4e20));
    NONFAILING(*(uint16_t*)0x2037c024 = htobe16(0x4e20));
    NONFAILING(*(uint16_t*)0x2037c026 = htobe16(8));
    NONFAILING(*(uint16_t*)0x2037c028 = 0);
    struct csum_inet csum_1;
    csum_inet_init(&csum_1);
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x2037c01a, 4));
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x2037c01e, 4));
    uint16_t csum_1_chunk_2 = 0x1100;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
    uint16_t csum_1_chunk_3 = 0x800;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x2037c022, 8));
    NONFAILING(*(uint16_t*)0x2037c028 = csum_inet_digest(&csum_1));
    struct csum_inet csum_2;
    csum_inet_init(&csum_2);
    NONFAILING(csum_inet_update(&csum_2, (const uint8_t*)0x2037c00e, 20));
    NONFAILING(*(uint16_t*)0x2037c018 = csum_inet_digest(&csum_2));
    break;
  }
}

void execute_one()
{
  execute(11);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  char* cwd = get_current_dir_name();
  for (;;) {
    if (chdir(cwd))
      fail("failed to chdir");
    use_temporary_dir();
    loop();
  }
}