// https://syzkaller.appspot.com/bug?id=9ed44c22919e3cd2c71907b963fb048ac1115073
// 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 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 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_dev(volatile long a0, volatile long a1, volatile 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);
  }
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int 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 = 0;
  for (;; 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 < 5000) {
        continue;
      }
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  res = -1;
  res = syz_open_dev(0xc, 4, 1);
  if (res != -1)
    r[0] = res;
  *(uint64_t*)0x20000100 = 0x20000340;
  memcpy(
      (void*)0x20000340,
      "\x9f\x81\x94\xbe\x5a\xce\x60\x2f\x09\x6d\x07\xff\x00\xcd\x66\x29\x96\x67"
      "\xb7\x05\x36\x34\x26\x23\xb3\x72\xd8\x2f\xef\xa0\x1f\x9a\x2d\x37\x85\x83"
      "\x29\x7f\x99\xb4\xe5\x97\x00\x00\x00\x00\x00\x00\x00\x81\xf4\x7c\xd0\xc1"
      "\x54\x49\x71\x2f\x00\xc5\x1c\x63\x8e\x6a\xea\x4a\x8d\xee\x82\x52\x86\xb3"
      "\x1a\x26\x0e\x60\x48\x2b\xb0\xb4\x17\x9b\x31\x5d\x02\xd6\xae\x2a\x66\xf0"
      "\xde\x24\x57\x45\xa9\x3f\x1c\x98\x84\x14\xbb\x8f\x83\x03\xf2\x80\xa1\x96"
      "\x49\x03\xc8\xc9\x18\xc3\x43\xd1\x82\x12\x5a\xd7\x3d\x38\xd7\x18\x76\xd5"
      "\x14\x34\x4c\x2c\xde\x87\x00\xe7\x6b\x24\x29\xc5\xac\xe9\x1e",
      141);
  *(uint64_t*)0x20000108 = 0x8d;
  *(uint64_t*)0x20000110 = 0;
  *(uint64_t*)0x20000118 = 0;
  *(uint64_t*)0x20000120 = 0;
  *(uint64_t*)0x20000128 = 0;
  syscall(__NR_writev, r[0], 0x20000100ul, 3ul);
  *(uint32_t*)0x20000000 = 0xd;
  syscall(__NR_ioctl, r[0], 0x5423, 0x20000000ul);
  res = -1;
  res = syz_open_dev(0xc, 4, 1);
  if (res != -1)
    r[1] = res;
  syscall(__NR_ioctl, r[1], 0x540a, 0ul);
  res = -1;
  res = syz_open_dev(0xc, 4, 1);
  if (res != -1)
    r[2] = res;
  syscall(__NR_ioctl, r[2], 0x540a, 1ul);
}
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);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}