// 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>

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;
  for (call = 0; call < 9; 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;
    }
  }
}

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

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    memcpy((void*)0x200000c0,
           "\x2f\x65\x78\x65\x00\x00\x00\x00\x00\x04\x09\x00\x4b\xdd\xd9\xde"
           "\x91\xbe\x10\xee\xbf\x00\x0e\xe9\xa9\x0f\x79\x80\x58\x43\x9e\xd5"
           "\x54\xfa\x07\x42\x4a\xde\xe9\x01\xd2\xda\x75\xaf\x30\x02\x00\xf5"
           "\xab\xfb\x98\x45\xf9\xe1\x98\x59\xc9\x69\x32\x06\xf2\xc6\x0b\x00"
           "\x00\x00\x07\x19\xe1\xd6\x6e\x97\x01\x23\xd8\x93\xd9\x74\xe5\xb9"
           "\xc3\x28\x56\x77\xb2\x13\x98\x23\xe5\x50\x0c\x92\xab\x5b\x94\xda"
           "\x3a\x7d\xe1\x9f\x06\x3b\xb7\x65\xb0\x2b\xd5\xb6\x60\xfb\x7f\xa8"
           "\x98\xc6\xf5\xc6\x36\x9c\x3f\x36\x30\x68\xd1\x0a\xf8\x33\xf6\x47"
           "\x5b\xbe\x8b\x79\x67\x25\x5b\x17\x76\x07\xba\x10\x0f\x6c\x46\x54"
           "\x71\x82\x32\xdb\xda\x64\xaa\x1f\x69\xcf\x9a\xb5\xb3\xea\x3e\xd6"
           "\x34\x52\xb7\xeb\xd3\x7c\x9d\xae\x66\x4e\x32\x2e\x08\xad\x8f\x60"
           "\x29\xfe\x8f\xd0\xb3\x4c\x71\x17\x48\x04\x71\xae\xca\x0a\x3f\xc9"
           "\xec\xeb\x28\x50\x9c\xa8\xa8\x3e\x4f\x8b\x85\x13\x18\x08\xbc\x5c"
           "\xfb\x4c\xc2\x4e\x19\x01\x76\x9c\x08\x4c\x08\x27\x12\xb4\x70\x66"
           "\x6b\x6d\xdd\xf7\x4c\xed\x69\x39\x73\xba\x1d\xed\x8b",
           237);
    res = syz_open_procfs(0, 0x200000c0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    memcpy((void*)0x20000700, "./bus", 6);
    res = syscall(__NR_creat, 0x20000700, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 2:
    syscall(__NR_fcntl, r[1], 4, 0x40000006100);
    break;
  case 3:
    syscall(__NR_ftruncate, r[1], 0x208200);
    break;
  case 4:
    memcpy((void*)0x2000fffa, "./bus", 6);
    res = syscall(__NR_open, 0x2000fffa, 0x141042, 0);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    syscall(__NR_mmap, 0x20008000, 0x600000, 0x800002, 0x11, r[2], 0);
    break;
  case 6:
    memcpy((void*)0x200003c0, "./bus", 6);
    res = syscall(__NR_open, 0x200003c0, 0, 0x20000000000);
    if (res != -1)
      r[3] = res;
    break;
  case 7:
    syscall(__NR_sendfile, r[1], r[3], 0, 0x8000fffffffe);
    break;
  case 8:
    *(uint64_t*)0x200075c0 = 0x20006200;
    *(uint64_t*)0x200075c8 = 0;
    *(uint64_t*)0x200075d0 = 0x20000000;
    *(uint64_t*)0x200075d8 = 0xfffffec3;
    *(uint64_t*)0x200075e0 = 0x20006300;
    *(uint64_t*)0x200075e8 = 0;
    *(uint64_t*)0x200075f0 = 0x20006400;
    *(uint64_t*)0x200075f8 = 0;
    *(uint64_t*)0x20007600 = 0x20007400;
    *(uint64_t*)0x20007608 = 0;
    *(uint64_t*)0x20007610 = 0x20007500;
    *(uint64_t*)0x20007618 = 0;
    syscall(__NR_preadv, r[0], 0x200075c0, 0x1000000000000212, 0);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}