// https://syzkaller.appspot.com/bug?id=3f5b96f8dc038550dc5aaffac6709aaf74161764
// 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/ioctl.h>
#include <sys/mount.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 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);
  if (pthread_create(&th, &attr, fn, arg))
    exit(1);
  pthread_attr_destroy(&attr);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

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_dev(long a0, long a1, long a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    while (umount2(filename, MNT_DETACH) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
            close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
      if (umount2(filename, MNT_DETACH))
        exit(1);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
            close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

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 < 5; 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++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      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;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0x15, 5, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint16_t*)0x20000840 = 2;
    *(uint16_t*)0x20000842 = htobe16(0);
    *(uint32_t*)0x20000844 = htobe32(0x7f000001);
    *(uint8_t*)0x20000848 = 0;
    *(uint8_t*)0x20000849 = 0;
    *(uint8_t*)0x2000084a = 0;
    *(uint8_t*)0x2000084b = 0;
    *(uint8_t*)0x2000084c = 0;
    *(uint8_t*)0x2000084d = 0;
    *(uint8_t*)0x2000084e = 0;
    *(uint8_t*)0x2000084f = 0;
    syscall(__NR_bind, r[0], 0x20000840, 0x10);
    break;
  case 2:
    *(uint32_t*)0x2001d000 = 1;
    *(uint32_t*)0x2001d004 = 0x70;
    *(uint8_t*)0x2001d008 = 0;
    *(uint8_t*)0x2001d009 = 0;
    *(uint8_t*)0x2001d00a = 0;
    *(uint8_t*)0x2001d00b = 0;
    *(uint32_t*)0x2001d00c = 0;
    *(uint64_t*)0x2001d010 = 0x7f;
    *(uint64_t*)0x2001d018 = 0;
    *(uint64_t*)0x2001d020 = 0;
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 0, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 1, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 2, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 3, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 4, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 5, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 6, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 7, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 8, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 9, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 10, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 11, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 12, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 13, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 14, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 15, 2);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 17, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 18, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 19, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 20, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 21, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 22, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 23, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 24, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 25, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 26, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 27, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 28, 1);
    STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 29, 35);
    *(uint32_t*)0x2001d030 = 0;
    *(uint32_t*)0x2001d034 = 0;
    *(uint64_t*)0x2001d038 = 0x20abe000;
    *(uint64_t*)0x2001d040 = 0;
    *(uint64_t*)0x2001d048 = 0;
    *(uint64_t*)0x2001d050 = 0;
    *(uint32_t*)0x2001d058 = 0;
    *(uint32_t*)0x2001d05c = 0;
    *(uint64_t*)0x2001d060 = 0;
    *(uint32_t*)0x2001d068 = 0;
    *(uint16_t*)0x2001d06c = 0;
    *(uint16_t*)0x2001d06e = 0;
    syscall(__NR_perf_event_open, 0x2001d000, 0, -1, -1, 0);
    break;
  case 3:
    *(uint64_t*)0x20001600 = 0x20000000;
    *(uint16_t*)0x20000000 = 2;
    *(uint16_t*)0x20000002 = htobe16(0);
    *(uint8_t*)0x20000004 = 0xac;
    *(uint8_t*)0x20000005 = 0x14;
    *(uint8_t*)0x20000006 = 0x14;
    *(uint8_t*)0x20000007 = 0xbb;
    *(uint8_t*)0x20000008 = 0;
    *(uint8_t*)0x20000009 = 0;
    *(uint8_t*)0x2000000a = 0;
    *(uint8_t*)0x2000000b = 0;
    *(uint8_t*)0x2000000c = 0;
    *(uint8_t*)0x2000000d = 0;
    *(uint8_t*)0x2000000e = 0;
    *(uint8_t*)0x2000000f = 0;
    *(uint32_t*)0x20001608 = 0x10;
    *(uint64_t*)0x20001610 = 0x20000100;
    *(uint64_t*)0x20001618 = 0;
    *(uint64_t*)0x20001620 = 0x20000780;
    *(uint64_t*)0x20000780 = 0x48;
    *(uint32_t*)0x20000788 = 0x114;
    *(uint32_t*)0x2000078c = 1;
    *(uint32_t*)0x20000790 = 0;
    *(uint32_t*)0x20000794 = 0;
    *(uint64_t*)0x20000798 = 0x20000040;
    *(uint64_t*)0x200007a0 = 0x9c;
    *(uint64_t*)0x200007a8 = 0x200006c0;
    *(uint64_t*)0x200006c0 = 0x20000100;
    *(uint64_t*)0x200006c8 = 0x2c;
    *(uint64_t*)0x200006d0 = 0x20000140;
    *(uint64_t*)0x200006d8 = 0xf;
    *(uint64_t*)0x200006e0 = 0x20000340;
    *(uint64_t*)0x200006e8 = 0x36;
    *(uint64_t*)0x200006f0 = 0x20000380;
    *(uint64_t*)0x200006f8 = 0x2a;
    *(uint64_t*)0x20000700 = 0x20000440;
    *(uint64_t*)0x20000708 = 0xf4;
    *(uint64_t*)0x200007b0 = 5;
    *(uint64_t*)0x200007b8 = 0x60;
    *(uint64_t*)0x200007c0 = 0;
    *(uint64_t*)0x20001628 = 0x48;
    *(uint32_t*)0x20001630 = 0;
    syscall(__NR_sendmsg, r[0], 0x20001600, 0);
    break;
  case 4:
    memcpy((void*)0x20000700, "/dev/snd/seq", 13);
    syz_open_dev(0x20000700, 0, 0);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
    }
  }
  sleep(1000000);
  return 0;
}