// https://syzkaller.appspot.com/bug?id=a74718ca902617e6aa7327aa008b25844eccf2d3
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <time.h>
#include <unistd.h>

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  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);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  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 sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i;
  for (i = 0; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

#define __syscall syscall

struct thread_t {
  int created, call;
  event_t ready, done;
};

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 (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void loop(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 12; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    syscall(SYS_ioctl, -1, 0x80104267, 0);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x20000040, "./file0\000", 8));
    syscall(SYS_open, 0x20000040, 0x611, 0);
    break;
  case 2:
    NONFAILING(memcpy((void*)0x20000180, "./file0\000", 8));
    res = syscall(SYS_open, 0x20000180, 0, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 3:
    NONFAILING(memcpy((void*)0x20000040, "./file0\000", 8));
    res = syscall(SYS_open, 0x20000040, 0x611, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    NONFAILING(memcpy((void*)0x20000800, "./file0\000", 8));
    res = syscall(SYS_open, 0x20000800, 0x40000400000002c2, 0);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    syscall(SYS_ftruncate, r[2], 0, 0x7fffffff);
    break;
  case 6:
    syscall(SYS_preadv, r[2], 0, 0, 0, 0x7fa20600);
    break;
  case 7:
    syscall(SYS_ftruncate, r[2], 0, 0x80);
    break;
  case 8:
    NONFAILING(memcpy(
        (void*)0x20000480,
        "\xac\x0f\xd6\xdd\x2f\x9e\xd4\x08\x57\x6a\xe1\xef\xbe\x5e\x24\x40\x42"
        "\xc9\xef\xb3\x1f\xa0\x4a\xa8\xb7\xdd\x4d\x88\xa7\x59\x35\x5b\xf5\x3c"
        "\x91\x8f\xf3\x52\xd7\x2e\xd1\xe9\xa6\x09\x9d\x9b\x67\x7c\x14\x7f\x35"
        "\x56\x1c\x9d\x05\xdd\x98\x43\x89\xa1\xb5\xf7\x40\x56\xe4\x63\x1d\x16"
        "\xba\xfc\xbd\x81\x11\xcb\x7a\x00\xe7\xe5\x06\x00\x00\x00\x73\xef\x1f"
        "\xd1\x7b\x3e\xda\x7b\xb7\x80\x13\x0e\xb8\xd6\x05\x41\x36\x2c\x45\x19"
        "\xa7\x6b\x0f\xe7\xdb\x0f\x64\x73\x9c\x08\x16\x94\x37\x0a\xdc\x31\xe8"
        "\xf4\x5c\xbe\xfb\x20\xef\x00\x00\x7b\xdc\x6d\xed\xdc\xf3\xb2\xf7\x9b"
        "\x46\x3c\x01\x96\x3f\xcc\xc0\x58\xac\xbf\xda\x15\x57\x93\x7a\x1d\xc9"
        "\x1f\x01\x7e\xda\x9c\x17\x82\xe0\x0b\x2b\x4b\x2c\x59\x9a\x08\xbe\x89"
        "\xf4\x96\x99\x4f\x67\x9a\x63\x55\x72\x65\x62\xed\xca\x44\x62\x12\x80"
        "\xea\x80\xb5\xe8\x6c\xd8\xb8\x14\x87\x41\xb6\xbd\x66\x45\x47\x6c\xf5"
        "\xfd\x5c\x4f\xa1\xbd\xe7\x5f\x84\x96\xed\xc3\xd3\x87\x51\x1d\x95\xba"
        "\xbc\x9e\x97\x56\xcb\xac\x31\x5a\x35\x64\x00\x00\x00\x00\x00\x93",
        237));
    syscall(SYS_pwrite, r[1], 0x20000480, 0xed, 0, 0x59);
    break;
  case 9:
    syscall(SYS_mmap, 0x20000000, 0x1000, 5, 0x10, r[0], 0, 0);
    break;
  case 10:
    syscall(SYS_ioctl, r[1], 0x80045713, 0);
    break;
  case 11:
    NONFAILING(memcpy((void*)0x20000140, "./bus\000", 6));
    syscall(SYS_open, 0x20000140, 0, 0);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000, 0x1000000, 3, 0x1012, -1, 0, 0);
  install_segv_handler();
  use_temporary_dir();
  loop();
  return 0;
}