// https://syzkaller.appspot.com/bug?id=095195b439a800f60260a2b18f45f103a3cc7462
// 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_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;
    }
  }
}

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

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

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x200001c0, "/dev/loop#\000", 11);
  res = -1;
  res = syz_open_dev(0x200001c0, 0x75f, 0);
  if (res != -1)
    r[0] = res;
  *(uint32_t*)0x20000200 = 0;
  *(uint16_t*)0x20000208 = 0;
  *(uint64_t*)0x20000210 = 0;
  *(uint16_t*)0x20000218 = 0;
  *(uint32_t*)0x20000220 = 0;
  *(uint32_t*)0x20000224 = 0;
  *(uint32_t*)0x20000228 = 0;
  *(uint32_t*)0x2000022c = 0;
  memcpy((void*)0x20000230,
         "\x7a\xb1\x58\x69\x4a\x33\x82\xc5\x94\xcc\x3f\xf9\x08\x33\x99\x5f\x3f"
         "\x51\xad\x25\x60\xff\xf8\xb4\xb2\xf3\x36\xab\xe5\x2c\x9e\x0e\xd2\xc7"
         "\xe2\x70\x39\x53\x52\xee\x70\x80\xc1\x07\xb7\x65\x89\xe1\xe8\x4a\x20"
         "\xa3\xb6\xdd\xad\x0a\x33\x51\x8c\x58\x57\x55\xc4\x72",
         64);
  memcpy((void*)0x20000270,
         "\x3e\x52\x5d\x81\xba\x8d\x43\x70\xf2\xf9\x0e\x2d\x5f\x76\xdf\xec\xf1"
         "\xd2\x20\xee\xac\x2d\x4c\x2d\x33\xc6\x85\x19\xd2\x22\xce\x8c",
         32);
  *(uint64_t*)0x20000290 = 0;
  *(uint64_t*)0x20000298 = 0;
  *(uint32_t*)0x200002a0 = 0;
  syscall(__NR_ioctl, r[0], 0x4c09, 0x20000200ul);
  memcpy((void*)0x200001c0, "/dev/loop#\000", 11);
  res = -1;
  res = syz_open_dev(0x200001c0, 0x75f, 0x103382);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x20000240, ".^\305", 3);
  res = syscall(__NR_memfd_create, 0x20000240ul, 0ul);
  if (res != -1)
    r[2] = res;
  *(uint64_t*)0x20000540 = 0x20000000;
  memset((void*)0x20000000, 66, 1);
  *(uint64_t*)0x20000548 = 1;
  syscall(__NR_pwritev, r[2], 0x20000540ul, 1ul, 0x81805, 0);
  syscall(__NR_ioctl, r[1], 0x4c00, r[2]);
}
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;
}