// https://syzkaller.appspot.com/bug?id=59c37b9d0eba4651aea07dbb21a5571090386ecc
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.h>

unsigned long long procid;

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 thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  if (pthread_create(&th, &attr, fn, arg))
    exit(1);
  pthread_attr_destroy(&attr);
}

typedef struct {
  int state;
} event_t;

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

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

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

static long syz_open_procfs(long a0, long a1)
{
  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == -1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

#define SYZ_HAVE_SETUP_TEST 1
static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
}

#define SYZ_HAVE_RESET_TEST 1
static void reset_test()
{
  int fd;
  for (fd = 3; fd < 30; fd++)
    close(fd);
}

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 execute_one(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 17; 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;
  }
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      reset_test();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    syscall(__NR_getpgrp, 0);
    break;
  case 1:
    syscall(__NR_getpgid, -1);
    break;
  case 2:
    syscall(__NR_ioctl, 0xffffff9c, 0x540f, 0);
    break;
  case 3:
    syscall(__NR_fcntl, 0xffffff9c, 9);
    break;
  case 4:
    syscall(__NR_fcntl, 0xffffff9c, 9);
    break;
  case 5:
    syscall(__NR_ioctl, 0xffffff9c, 0x5429, 0);
    break;
  case 6:
    memcpy(
        (void*)0x20001380,
        "\x2f\x65\x78\x65\x00\x00\x00\x00\x00\x04\x09\x00\x4b\xdd\xd9\xf1\x91"
        "\xbe\x10\xee\xbf\x00\x0e\xe9\xff\x07\x00\x00\x00\x00\x00\x00\x54\xfa"
        "\x07\x42\x4a\xde\xe9\x16\xd2\xda\x75\xaf\x71\xfb\x35\x33\x1c\xe3\x9c"
        "\x5a\x65\x68\x64\x10\x72\x1e\xe2\xdb\x6a\x74\xe3\x33\x26\x53\xb0\xd2"
        "\x70\xb1\xad\x3d\xb7\x20\x8e\x0b\x75\xdc\x35\x8e\x83\x6c\x2c\x9d\x3d"
        "\xdc\x53\x63\x46\x71\x21\x3b\x4c\x2c\x07\x48\xbd\x02\xbf\x37\x05\x17"
        "\x8d\xf8\xb9\x96\xf2\xbc\xee\x6c\x9f\x6e\x14\x5c\x17\x87\xfa\xda\xe6"
        "\x09\x4d\x6e\x1a\xc4\x3b\x78\xac\x66\xff\x2b\x82\x3d\x3d\xe2\x6a\x6c"
        "\x99\x7f\x1f\x99\xd1\x84\x94\xc6\x8f\xde\x58\x96\x6f\xe0\xb9\xb2\x9b"
        "\x83\xd7\x8c\xc2\xf1\x8b\x04\xd7\xd0\x1f\x1a\x33\x29\x7c\xb5\x48\x00"
        "\x00\x6d\xc0\xde\xcb\x6a\x9a\xb0\xc5\x9d\x79\x34\x15\x0f\xdb\x98\x34"
        "\x08\x6e\x7c\x0d\xa2\xc8\xcc\xee\xb8\xae\xcc\x06\x91\x37\x88\xe0\xa9"
        "\x8f\x9b\x05\x51\xdc\xe6\xb6\xed\x79\x2c\xf9\x6a\xa6\xbb\x17\xd7\xaf"
        "\x33\xbd\xd7\x04\xab\x73\x22\x95\xa9\x95\x0e\x81\xfd\xbb\x37\xda\x86"
        "\xf9\xc5\x76\x67\x8d\xbd\x66\xa4\x26\xd7\x58\x2c\x78\xb7\xf0\x76\x22"
        "\xa4\xd7\xf3\xda\x7c\xfc\x56\xa2\x4e\x9b\xed\x9a\x94\x14\xa9\x45\x65"
        "\xc2\x8b\xc6\x6b\xe4\xef\x0b\x19\x80\x0e\x7f\xed\xd2\xff\xc9\xd3\x6f"
        "\x12\x03\x01\xaf\x68\x7a\x5e\x70\x32\xcd\xc8\x11\x9e\x9d\xcc\x95\xb6"
        "\xa8\x67\x12\x21\x12\x77\x99\xcc\x4b\x3c\x2f\x28\xdf\x18\x7a\x85\xe5"
        "\xb7\x03\x9a\x29\xe9\xb0\xb4\x27\x67\xe7\x2c\x78\x20\xe0\xc7\xe7\x0c"
        "\x73\xe3\x52\x85\x63\xcb\xb3\xdc\xe8\x58\x13\xa1\x39\x73\xe6\x12\x4e"
        "\x5e\x3d\xac\x84\xcc\x53\x1f\x0c\xf4\xbd\xe5\xe3\x23\xe1\x9b\xef\x86"
        "\x5b\x85\xa9\x61\x40\x09\x70\x7f\xcc\xe8\xb0\x13\xdd\xb6\x95\x5a\xb7"
        "\x3f\x0e\x96\x48\x0b\x5f\x22\x98\x93\xec\x5c\x00\x4c\x26\x05\x63\xb6"
        "\x14\x55\x0e\x3e\x2c\xfa\x02\x4c\xca\x29\x09\xa8\x5e\x84\x5a\x88\xe6"
        "\xdb\x00\xce\x60\xb1\x41\x2e\xa3\x4c\x27\xf5\x37\xfc\xd7\xf3\x94\xff"
        "\xe4\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x24\xbf"
        "\x2e\x6e\x44\x23\xca\xb6\x35\x22\x4b\x28\xb1\xf8\x28\x5a\xc1\xfd\xc9"
        "\xc5\x53\x77\x63\xf2\x65\x4e\xc2\xdd\xd0\x01\xfe\x56\x12\x38\xf5\x9f"
        "\x58\x2c\xf0\xa0\xe4\xd2\x37\x0a\xa2\x55\x07\x6a\x47\xac\x4e\xa0\xdb"
        "\xa9\x5e\xbf\x84\x2b\x1d\xf0\xaf\xcd\xeb\x01\xfb\x1b\x67\xa1\xbd\xdf"
        "\x7b\x5a\x19\xe0\xd9\xd5\xbb\x2a\xe8\x44\xce\xe3\xd6\x31\xc0\x87\x12"
        "\x5d\x3e\x0b\x42\x1c\xad\xc8\x23\x6b\xc1\xc7\xbb\x91\x9d\x82\x72\x57"
        "\x7b\xb9\x1d\x3a\xdb\x0d\x2f\x5c\xeb\x73\xf5\xe1\xb1\xfd\x1e\xe4\xf3"
        "\x87\x92\xa5\xd4\x40\x89\x0c\x9a\x41\x0c\x81\xae\x08\x88\xa9\x79\x30"
        "\x54\xa3\x1b\x50\x6e\x04\x51\xcb\xd8\x5a\xa8\x85",
        607);
    res = syz_open_procfs(0, 0x20001380);
    if (res != -1)
      r[0] = res;
    break;
  case 7:
    syscall(__NR_fcntl, r[0], 4, 0x5ffe);
    break;
  case 8:
    memcpy((void*)0x20000700, "./bus", 6);
    res = syscall(__NR_creat, 0x20000700, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 9:
    syscall(__NR_fcntl, r[1], 4, 0x6100);
    break;
  case 10:
    syscall(__NR_ftruncate, r[1], 0x8200);
    break;
  case 11:
    memcpy((void*)0x2000fffa, "./bus", 6);
    res = syscall(__NR_open, 0x2000fffa, 0x141042, 0);
    if (res != -1)
      r[2] = res;
    break;
  case 12:
    syscall(__NR_mmap, 0x20001000, 0xa000, 0x800002, 0x11, r[2], 0);
    break;
  case 13:
    memcpy((void*)0x20000040, "./bus", 6);
    res = syscall(__NR_open, 0x20000040, 0, 0);
    if (res != -1)
      r[3] = res;
    break;
  case 14:
    syscall(__NR_getsockopt, r[3], 0, 0x81, 0, 0);
    break;
  case 15:
    syscall(__NR_sendfile, r[1], r[3], 0, 0x8000fffffffe);
    break;
  case 16:
    syscall(__NR_pread64, r[0], 0x20002000, 0x1000, 0);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}