// https://syzkaller.appspot.com/bug?id=8489d24fe06aab5f3cfb4bd0e2b4c8665e8909bf
// 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/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>

#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_mremap
#define __NR_mremap 163
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

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 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 (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

void execute_one(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  ioctl$AUTOFS_DEV_IOCTL_CLOSEMOUNT arguments: [
  //    fd: fd_autofs (resource)
  //    cmd: const = 0xc0189375 (4 bytes)
  //    arg: ptr[inout, autofs_dev_ioctl[void]] {
  //      autofs_dev_ioctl[void] {
  //        base: autofs_dev_ioctl_base[void] {
  //          ver_major: const = 0x1 (4 bytes)
  //          ver_minor: const = 0x1 (4 bytes)
  //          size: len = 0x18 (4 bytes)
  //          ioctlfd: fd (resource)
  //          content: buffer: {} (length 0x0)
  //          pad = 0x0 (8 bytes)
  //        }
  //        path: buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
  //      }
  //    }
  //  ]
  *(uint32_t*)0x80000000 = 1;
  *(uint32_t*)0x80000004 = 1;
  *(uint32_t*)0x80000008 = 0x18;
  *(uint32_t*)0x8000000c = -1;
  memcpy((void*)0x80000018, "./file0\000", 8);
  syscall(__NR_ioctl, /*fd=*/(intptr_t)-1, /*cmd=*/0xc0189375,
          /*arg=*/0x80000000);
  //  mremap arguments: [
  //    addr: VMA[0x4000]
  //    len: len = 0x200000 (4 bytes)
  //    newlen: len = 0x4000 (4 bytes)
  //    flags: mremap_flags = 0x3 (4 bytes)
  //    newaddr: VMA[0x4000]
  //  ]
  syscall(__NR_mremap, /*addr=*/0x80002000, /*len=*/0x200000, /*newlen=*/0x4000,
          /*flags=MREMAP_FIXED|MREMAP_MAYMOVE*/ 3, /*newaddr=*/0x80ffc000);
  //  mremap arguments: [
  //    addr: VMA[0x4000]
  //    len: len = 0x4000 (4 bytes)
  //    newlen: len = 0x4000 (4 bytes)
  //    flags: mremap_flags = 0x7 (4 bytes)
  //    newaddr: VMA[0x4000]
  //  ]
  syscall(__NR_mremap, /*addr=*/0x80ffc000, /*len=*/0x4000, /*newlen=*/0x4000,
          /*flags=MREMAP_FIXED|MREMAP_MAYMOVE|0x4*/ 7, /*newaddr=*/0x80002000);
  //  mremap arguments: [
  //    addr: VMA[0x1000]
  //    len: len = 0x1000 (4 bytes)
  //    newlen: len = 0x2000 (4 bytes)
  //    flags: mremap_flags = 0x3 (4 bytes)
  //    newaddr: VMA[0x2000]
  //  ]
  syscall(__NR_mremap, /*addr=*/0x80ffd000, /*len=*/0x1000, /*newlen=*/0x2000,
          /*flags=MREMAP_FIXED|MREMAP_MAYMOVE*/ 3, /*newaddr=*/0x80ffe000);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x7ffff000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x80000000, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x81000000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}