// https://syzkaller.appspot.com/bug?id=06bf6d5e0baeabdedeba2bc300abf20a7a150e11
// 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_close_range
#define __NR_close_range 436
#endif

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)) {
  }
  //  mmap$auto arguments: [
  //    addr: intptr = 0x0 (8 bytes)
  //    len: intptr = 0x400008 (8 bytes)
  //    prot: intptr = 0xdf (8 bytes)
  //    flags: intptr = 0x9b72 (8 bytes)
  //    fd: fd (resource)
  //    off: intptr = 0x40000008000 (8 bytes)
  //  ]
  syscall(__NR_mmap, /*addr=*/0ul, /*len=*/0x400008ul, /*prot=*/0xdful,
          /*flags=*/0x9b72ul, /*fd=*/2, /*off=*/0x40000008000ul);
  //  close_range$auto arguments: [
  //    fd: fd (resource)
  //    max_fd: fd (resource)
  //    flags: int32 = 0x0 (4 bytes)
  //  ]
  syscall(__NR_close_range, /*fd=*/0, /*max_fd=*/5, /*flags=*/0);
  //  socket arguments: [
  //    domain: socket_domain = 0x18 (8 bytes)
  //    type: socket_type = 0x2 (8 bytes)
  //    proto: int32 = 0x0 (4 bytes)
  //  ]
  //  returns sock
  syscall(__NR_socket, /*domain=AF_PPPOX*/ 0x18ul, /*type=SOCK_DGRAM*/ 2ul,
          /*proto=*/0);
  //  clone$auto arguments: [
  //    clone_flags: intptr = 0x20003b43 (8 bytes)
  //    newsp: intptr = 0x4 (8 bytes)
  //    parent_tidptr: nil
  //    child_tidptr: nil
  //    tls: intptr = 0x0 (8 bytes)
  //  ]
  //  returns pid
  syscall(__NR_clone, /*clone_flags=*/0x20003b43ul, /*newsp=*/4ul,
          /*parent_tidptr=*/0ul, /*child_tidptr=*/0ul, /*tls=*/0ul);
  //  openat$auto_def_blk_fops_fs arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 6e 75 6c 6c 62 30 00} (length 0xc)
  //    }
  //    flags: open_flags = 0x14be02 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_def_blk_fops_fs
  memcpy((void*)0x200000000000, "/dev/nullb0\000", 12);
  syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000000ul,
          /*flags=O_TRUNC|O_SYNC|O_NONBLOCK|O_NOATIME|O_LARGEFILE|FASYNC|0x402*/
          0x14be02, /*mode=*/0);
  //  socket$nl_generic arguments: [
  //    domain: const = 0x10 (8 bytes)
  //    type: const = 0x3 (8 bytes)
  //    proto: const = 0x10 (4 bytes)
  //  ]
  //  returns sock_nl_generic
  syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0x10);
  //  recvfrom$auto arguments: [
  //    fd: fd (resource)
  //    ubuf: nil
  //    size: intptr = 0x800000000e (8 bytes)
  //    flags: int32 = 0x100 (4 bytes)
  //    addr: nil
  //    addr_len: nil
  //  ]
  syscall(__NR_recvfrom, /*fd=*/3, /*ubuf=*/0ul, /*size=*/0x800000000eul,
          /*flags=*/0x100, /*addr=*/0ul, /*addr_len=*/0xffffffff81000000ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}