// https://syzkaller.appspot.com/bug?id=d4117099a1b47bdb568410933723fa262993ceb9
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.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>

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 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;
}

#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) {
  }
}

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

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();
      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[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  syscall(__NR_sendfile, -1, -1, 0, 4);
  memcpy((void*)0x20000000, "./file0\000", 8);
  syscall(__NR_mkdir, 0x20000000, 0);
  memcpy((void*)0x200000c0, "./file0\000", 8);
  syscall(__NR_mount, 0x20000000, 0x200000c0, 0, 0x2001001, 0);
  memcpy((void*)0x20000140, "./file0\000", 8);
  memcpy((void*)0x20000100, "./file0\000", 8);
  syscall(__NR_pivot_root, 0x20000140, 0x20000100);
  res = syscall(__NR_socket, 0xa, 3, 0x87);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 0x10, 3, 6);
  if (res != -1)
    r[1] = res;
  *(uint16_t*)0x20000040 = 0x10;
  *(uint16_t*)0x20000042 = 0;
  *(uint32_t*)0x20000044 = 0;
  *(uint32_t*)0x20000048 = 1;
  syscall(__NR_bind, r[1], 0x20000040, 0xc);
  *(uint8_t*)0x200002c0 = 0xfe;
  *(uint8_t*)0x200002c1 = 0x80;
  *(uint8_t*)0x200002c2 = 0;
  *(uint8_t*)0x200002c3 = 0;
  *(uint8_t*)0x200002c4 = 0;
  *(uint8_t*)0x200002c5 = 0;
  *(uint8_t*)0x200002c6 = 0;
  *(uint8_t*)0x200002c7 = 0;
  *(uint8_t*)0x200002c8 = 0;
  *(uint8_t*)0x200002c9 = 0;
  *(uint8_t*)0x200002ca = 0;
  *(uint8_t*)0x200002cb = 0;
  *(uint8_t*)0x200002cc = 0;
  *(uint8_t*)0x200002cd = 0;
  *(uint8_t*)0x200002ce = 0;
  *(uint8_t*)0x200002cf = 0xbb;
  *(uint32_t*)0x200002d0 = htobe32(0xe0000002);
  *(uint16_t*)0x200002e0 = htobe16(0);
  *(uint16_t*)0x200002e2 = htobe16(0);
  *(uint16_t*)0x200002e4 = htobe16(0);
  *(uint16_t*)0x200002e6 = htobe16(0);
  *(uint16_t*)0x200002e8 = 2;
  *(uint8_t*)0x200002ea = 0;
  *(uint8_t*)0x200002eb = 0;
  *(uint8_t*)0x200002ec = 0;
  *(uint32_t*)0x200002f0 = 0;
  *(uint32_t*)0x200002f4 = 0;
  *(uint64_t*)0x200002f8 = 0;
  *(uint64_t*)0x20000300 = 0;
  *(uint64_t*)0x20000308 = 0;
  *(uint64_t*)0x20000310 = 0;
  *(uint64_t*)0x20000318 = 0;
  *(uint64_t*)0x20000320 = 0;
  *(uint64_t*)0x20000328 = 0;
  *(uint64_t*)0x20000330 = 0;
  *(uint64_t*)0x20000338 = 0;
  *(uint64_t*)0x20000340 = 0;
  *(uint64_t*)0x20000348 = 0;
  *(uint64_t*)0x20000350 = 0;
  *(uint32_t*)0x20000358 = 0;
  *(uint32_t*)0x2000035c = 0;
  *(uint8_t*)0x20000360 = 1;
  *(uint8_t*)0x20000361 = 0;
  *(uint8_t*)0x20000362 = 0;
  *(uint8_t*)0x20000363 = 0;
  *(uint8_t*)0x20000368 = -1;
  *(uint8_t*)0x20000369 = 2;
  *(uint8_t*)0x2000036a = 0;
  *(uint8_t*)0x2000036b = 0;
  *(uint8_t*)0x2000036c = 0;
  *(uint8_t*)0x2000036d = 0;
  *(uint8_t*)0x2000036e = 0;
  *(uint8_t*)0x2000036f = 0;
  *(uint8_t*)0x20000370 = 0;
  *(uint8_t*)0x20000371 = 0;
  *(uint8_t*)0x20000372 = 0;
  *(uint8_t*)0x20000373 = 0;
  *(uint8_t*)0x20000374 = 0;
  *(uint8_t*)0x20000375 = 0;
  *(uint8_t*)0x20000376 = 0;
  *(uint8_t*)0x20000377 = 1;
  *(uint32_t*)0x20000378 = htobe32(0);
  *(uint8_t*)0x2000037c = 0x2b;
  *(uint16_t*)0x20000380 = 0;
  *(uint8_t*)0x20000384 = 0xfe;
  *(uint8_t*)0x20000385 = 0x80;
  *(uint8_t*)0x20000386 = 0;
  *(uint8_t*)0x20000387 = 0;
  *(uint8_t*)0x20000388 = 0;
  *(uint8_t*)0x20000389 = 0;
  *(uint8_t*)0x2000038a = 0;
  *(uint8_t*)0x2000038b = 0;
  *(uint8_t*)0x2000038c = 0;
  *(uint8_t*)0x2000038d = 0;
  *(uint8_t*)0x2000038e = 0;
  *(uint8_t*)0x2000038f = 0;
  *(uint8_t*)0x20000390 = 0;
  *(uint8_t*)0x20000391 = 0;
  *(uint8_t*)0x20000392 = 0;
  *(uint8_t*)0x20000393 = 0xbb;
  *(uint32_t*)0x20000394 = 0;
  *(uint8_t*)0x20000398 = 0;
  *(uint8_t*)0x20000399 = 0;
  *(uint8_t*)0x2000039a = 0xfe;
  *(uint32_t*)0x2000039c = 0;
  *(uint32_t*)0x200003a0 = 0;
  *(uint32_t*)0x200003a4 = 0;
  syscall(__NR_setsockopt, r[0], 0x29, 0x23, 0x200002c0, 0xe8);
  *(uint16_t*)0x20000480 = 0xa;
  *(uint16_t*)0x20000482 = htobe16(0);
  *(uint32_t*)0x20000484 = htobe32(0);
  *(uint8_t*)0x20000488 = 0;
  *(uint8_t*)0x20000489 = 0;
  *(uint8_t*)0x2000048a = 0;
  *(uint8_t*)0x2000048b = 0;
  *(uint8_t*)0x2000048c = 0;
  *(uint8_t*)0x2000048d = 0;
  *(uint8_t*)0x2000048e = 0;
  *(uint8_t*)0x2000048f = 0;
  *(uint8_t*)0x20000490 = 0;
  *(uint8_t*)0x20000491 = 0;
  *(uint8_t*)0x20000492 = -1;
  *(uint8_t*)0x20000493 = -1;
  *(uint8_t*)0x20000494 = 0xac;
  *(uint8_t*)0x20000495 = 0x14;
  *(uint8_t*)0x20000496 = 0x14;
  *(uint8_t*)0x20000497 = 0xaa;
  *(uint32_t*)0x20000498 = 0;
  syscall(__NR_connect, r[0], 0x20000480, 0x1c);
}
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;
}