// https://syzkaller.appspot.com/bug?id=f9e1639c36b944b467c0ceb7bd13491049e2cdd9
// 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/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.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 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 long syz_open_procfs(volatile long a0, volatile 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) {
  }
}

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++) {
    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;
    }
  }
}

#ifndef __NR_execveat
#define __NR_execveat 322
#endif

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

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x20000180, "./bus\000", 6);
  res = syscall(__NR_open, 0x20000180ul, 0x151042ul, 0ul);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20000100, "/proc/diskstats\000", 16);
  res = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20000100ul, 0ul, 0ul);
  if (res != -1)
    r[1] = res;
  syscall(__NR_sendfile, r[0], r[1], 0ul, 0x4000000000010046ul);
  memcpy((void*)0x20000440, "./file1\000", 8);
  syscall(__NR_mkdir, 0x20000440ul, 0ul);
  memcpy((void*)0x20000340, "./file0\000", 8);
  syscall(__NR_mkdir, 0x20000340ul, 0ul);
  memcpy((void*)0x20000080, "./file0\000", 8);
  memcpy((void*)0x200001c0, "system.posix_acl_access\000", 24);
  *(uint32_t*)0x200003c0 = 2;
  *(uint16_t*)0x200003c4 = 1;
  *(uint16_t*)0x200003c6 = 0;
  *(uint32_t*)0x200003c8 = 0;
  *(uint16_t*)0x200003cc = 4;
  *(uint16_t*)0x200003ce = 0;
  *(uint32_t*)0x200003d0 = 0;
  *(uint16_t*)0x200003d4 = 8;
  *(uint16_t*)0x200003d6 = 0;
  *(uint32_t*)0x200003d8 = 0;
  *(uint16_t*)0x200003dc = 0x10;
  *(uint16_t*)0x200003de = 0;
  *(uint32_t*)0x200003e0 = 0;
  *(uint16_t*)0x200003e4 = 0x20;
  *(uint16_t*)0x200003e6 = 4;
  *(uint32_t*)0x200003e8 = 0;
  syscall(__NR_lsetxattr, 0x20000080ul, 0x200001c0ul, 0x200003c0ul, 0x2cul,
          0ul);
  memcpy((void*)0x20000300, "./file0\000", 8);
  memcpy((void*)0x20000100, "overlay\000", 8);
  memcpy((void*)0x200002c0, "upperdir=./file0,lowerdir=.:file0,workdir=./file1",
         49);
  syscall(__NR_mount, 0x400000ul, 0x20000300ul, 0x20000100ul, 0ul,
          0x200002c0ul);
  *(uint64_t*)0x20003140 = 0x20001400;
  *(uint32_t*)0x20003148 = 0x80;
  *(uint64_t*)0x20003150 = 0;
  *(uint64_t*)0x20003158 = 0;
  *(uint64_t*)0x20003160 = 0;
  *(uint64_t*)0x20003168 = 0;
  *(uint32_t*)0x20003170 = 0;
  *(uint32_t*)0x20003178 = 0;
  syscall(__NR_recvmmsg, -1, 0x20003140ul, 1ul, 0ul, 0ul);
  memcpy((void*)0x20000000, "io\000", 3);
  res = syz_open_procfs(0, 0x20000000);
  if (res != -1)
    r[2] = res;
  syscall(__NR_preadv, r[2], 0x200017c0ul, 0x369ul, 0ul);
  memcpy((void*)0x20000080, "./file0\000", 8);
  res = syscall(__NR_open, 0x20000080ul, 0ul, 0ul);
  if (res != -1)
    r[3] = res;
  memcpy((void*)0x200000c0, "./file0/f.le.\000", 14);
  syscall(__NR_execveat, r[3], 0x200000c0ul, 0ul, 0ul, 0x1000ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  loop();
  return 0;
}