// https://syzkaller.appspot.com/bug?id=db842327c655eab57b1755f661f1ab677d94e0bb
// 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 <stdarg.h>
#include <stdbool.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);
  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 {
  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 bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

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) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

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 < 6; 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();
      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[3] = {0xffffffffffffffff, 0x0, 0x0};

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    memcpy((void*)0x200000c0, "/dev/ptmx\000", 10);
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x200000c0, 0, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint32_t*)0x20000040 = 0xf;
    syscall(__NR_ioctl, r[0], 0x5423, 0x20000040);
    break;
  case 2:
    syscall(__NR_ioctl, r[0], 0x400455c8, 1);
    break;
  case 3:
    memcpy((void*)0x20000040, "user\000", 5);
    memcpy((void*)0x20000000, "syz", 3);
    *(uint8_t*)0x20000003 = 0;
    *(uint8_t*)0x20000004 = 0;
    memcpy((void*)0x200002c0,
           "\x58\x5c\xcb\xe4\xed\x83\xb8\x36\xc1\xa6\x47\x49\x14\xdc\x55\xe7"
           "\x22\x06\x29\x7b\x68\x95\xb6\x61\x47\xb3\xc7\x21\x8a\x91\x69\xa8"
           "\x5e\xa0\xbd\xc9\xe1\x58\x7a\x05\x00\x00\x00\x00\x00\x00\x00\x42"
           "\xe3\x30\x89\x75\x4c\x81\x07\xc3\xcd\x39\x23\xdd\x4a\x71\xc2\xff"
           "\x06\x00\x7b\x6b\x48\x16\x12\x2d\x25\x50\x82\x9e\xaa\x94\x35\xc9"
           "\x99\x26\x02\x2b\x87\x53\xa1\x88\x74\x8c\x56\x9f\x43\x5f\xb3\xba"
           "\xe9\x6e\xfb\x74\xb5\x0e\xc9\x3c\x15\x2f\x5e\x8e\x19\x8a\x29\xe5"
           "\xc0\xd0\xc6\x00\x00\xce\x06\x37\xce\x00\x00\xb4\xec\x24\xc5\x3d"
           "\x3d\x66\x1f\xf5\xff\x70\xe4\x88\x84\xca\x00\x00\x18\xce\xa7\x1f"
           "\xcf\xac\xf4\x0d\x32\xe4\xb5\x8a\x8d\x27\x25\x56\x1f\x61\x10\xfd"
           "\x7b\x06\xf9\x0b\x52\x74\xcc\x5c\x1e\x29\x8a\x16\x32\x4f\xe2\x7d"
           "\xa2\xa9\xd5\xba\x9f\xf3\xc0\x09\xd3\x08\xbd\x73\xf4\x77\x25\x39",
           192);
    res = syscall(__NR_add_key, 0x20000040, 0x20000000, 0x200002c0, 0xc0,
                  0xfffffffe);
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    memcpy((void*)0x20000200, "user\000", 5);
    memcpy((void*)0x200005c0, "syz", 3);
    *(uint8_t*)0x200005c3 = 0;
    *(uint8_t*)0x200005c4 = 0;
    res = syscall(__NR_add_key, 0x20000200, 0x200005c0, 0x200000c0, 0x9a,
                  0xfffffffd);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    *(uint32_t*)0x200000c0 = r[2];
    *(uint32_t*)0x200000c4 = r[1];
    *(uint32_t*)0x200000c8 = r[2];
    syscall(__NR_keyctl, 0x17, 0x200000c0, 0x9999999999999999, 0xf9ffffff, 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;
}