// https://syzkaller.appspot.com/bug?id=7cd3db70971bc10523485d12d95fdefa301fb819
// 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>

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 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;
  for (call = 0; call < 3; 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);
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

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;
    }
  }
}
#ifndef __NR_execveat
#define __NR_execveat 322
#endif
#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    memcpy((void*)0x200002c0, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 10);
    res = syscall(__NR_memfd_create, 0x200002c0, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    memcpy(
        (void*)0x200003c0,
        "\x7f\x45\x4c\x46\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03"
        "\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x38\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x20\x00\x01\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\xea\x09\x43\xb2\xdc\x23\x31\x28\x73\x76"
        "\x25\xf2\xd8\x19\xcf\xe3\x4d\xfb\x21\x19\x2f\x8d\x0d\xeb\x15\x9e\x2b"
        "\xcd\x45\xb8\x4c\x7d\xb5\x12\x51\x64\x14\x05\x41\xd4\xa8\xc9\xe3\x8b"
        "\x29\x9e\x53\xe8\xef\x4b\x3d\x1e\x44\x3c\x02\xb7\x29\xd5\xab\x08\x17"
        "\xc9\x62\xba\xaa\x30\xaf\xdd\x39\x4d\x3c\x16\xcc\x8b\x0f\xfd\x90\x14"
        "\xf9\x23\x5a\xbf\x1c\xb2\xec\x9d\x8d\x1d\x32\x50\x7a\x2b\xef\x23\xdc"
        "\x53\xc4\xe9\x05\xe4\x61\x29\xfa\x72\x81\xf4\xd1\x80\x37\x6a\x94\x3f"
        "\x03\xf6\x86\x86\xe4\x11\x9d\x3d\x5b\xee\x89\xee\x9e\x73\x07\x59\x16"
        "\x78\x27\xd4\x40\xf1\xe9\x85\xb8\x52\xb5\x79\x95\xa7\x65\x5d\x77\x23"
        "\x2e\xe6\x08\xed\x00\xab\x1a\x63\x42\x79\x34\xf6\xfb\x3f\xe7\x39\x0a"
        "\x8b\xea\xb2\x43\x9c\x21\x58\x9b\x06\x43\x59\x22\x44\x92\x96\xef\xb7"
        "\x65\xec\x3c\x36\xeb\x67\xd4\x3d\x58\xdf\x75\x33\x9b\x3b\x25\xe2\x5b"
        "\x1a\xc0\x01\x3a\xd5\xc7\xde\xa2\x24\x6f\x80\x2e\x12\xa7\x52\xf0\x0c"
        "\x3d\xdd\x61\x24\x6e\xc1\x09\x31\x85\x28\x9f\xa7\xe1\xdf\x49\x2c\x40"
        "\xfa\x60\xac\xf2\xd9\xc2\xe7\xd0\x0c\xd3\x8c\xc7\xd1\x64\xc3\xb1\x16"
        "\x1f\x5e\x27\x12\x47\xc5\x6a\xf4\x8f\x6b\xdc\xd7\x02\x93\x55\x5c\x2c"
        "\xb8\x49\x79\xbc\xb8\x03\x11\x56\x32\x64\x70\xd2\xdc\x9a\x35\x5e\xff"
        "\x46\x04\x97\xd2\x03\x02\x8c\x6f\x8c\x95\xe0\xfc\x80\x97\x30\xc7\x72"
        "\x46\x62\xaa\xf0\x73\xc2\x89\xeb\x72\x82\xd9\xbb\x43\x99\xf6\x1d\x35"
        "\x12\x8c\x6e\x12\xf2\xfa\x8b\xdc\x6a\xd0\x48\x03\x2f\x28\x43\x3c\xfa"
        "\x36\xa4\x12\xae\x6d\x30\x00\x19\xe4\xb7\x56\xa7\x75\x59\x70\x09\xca"
        "\xe1\x8a\x9b\x43\x49\x09\x17\xdb\x77\x8e\xd4\x26\x71\xc5\x09\x10\x27"
        "\xb7\x59\xa3\xe9\x54\x3e\xb4\xf4\x43\x88\x97\x72\xef\x7f\xf5\x75\x1b"
        "\x90\x9c\x7b\x0a\xe3\xb0\xf0\x15\x81\xa1\x8c\x42\x32\x9f\xb0\x04\x72"
        "\xf4\xd3\xb4\xb2\xe9\xaf\x4e\xc2\x80\xc8\x18\x86\x0e\x65\xc4\x32\x15"
        "\x6f\x08\x7e\xa2\xf1\x2b\xfb\xc9\xcd\xb2\x23\x89\xee\x4a\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x9d\x6b\xf4\x2c\x8b\x62\x99"
        "\x49\xda\xf8\x4d\x28\x38",
        533);
    syscall(__NR_write, r[0], 0x200003c0, 0x215);
    break;
  case 2:
    memcpy((void*)0x20000040, "", 1);
    syscall(__NR_execveat, r[0], 0x20000040, 0, 0, 0x1000);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}