// https://syzkaller.appspot.com/bug?id=778659e008f29309a7b9295c1aa97c0b38269bfe
// 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>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif
#ifndef __NR_fsconfig
#define __NR_fsconfig 431
#endif
#ifndef __NR_fsmount
#define __NR_fsmount 432
#endif
#ifndef __NR_fsopen
#define __NR_fsopen 430
#endif

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

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, /*domain=*/0xaul,
                /*type=SOCK_CLOEXEC|SOCK_NONBLOCK|SOCK_DCCP|0x40000000000*/
                0x40000080806ul, /*proto=*/0);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x2047b000 = 0xa;
  *(uint16_t*)0x2047b002 = htobe16(0x4e20);
  *(uint32_t*)0x2047b004 = htobe32(0);
  *(uint64_t*)0x2047b008 = htobe64(0);
  *(uint64_t*)0x2047b010 = htobe64(1);
  *(uint32_t*)0x2047b018 = 0;
  syscall(__NR_bind, /*fd=*/r[0], /*addr=*/0x2047b000ul, /*addrlen=*/0x1cul);
  syscall(__NR_listen, /*fd=*/r[0], /*backlog=*/0x20000005);
  *(uint32_t*)0x20001c40 = 8;
  *(uint32_t*)0x20001c44 = 3;
  *(uint64_t*)0x20001c48 = 0x20001300;
  memcpy((void*)0x20001300,
         "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x95",
         17);
  *(uint64_t*)0x20001c50 = 0x20001200;
  memcpy((void*)0x20001200, "syzkaller\000", 10);
  *(uint32_t*)0x20001c58 = 0;
  *(uint32_t*)0x20001c5c = 0;
  *(uint64_t*)0x20001c60 = 0;
  *(uint32_t*)0x20001c68 = 0;
  *(uint32_t*)0x20001c6c = 0;
  memset((void*)0x20001c70, 0, 16);
  *(uint32_t*)0x20001c80 = 0;
  *(uint32_t*)0x20001c84 = 0;
  *(uint32_t*)0x20001c88 = -1;
  *(uint32_t*)0x20001c8c = 8;
  *(uint64_t*)0x20001c90 = 0;
  *(uint32_t*)0x20001c98 = 0;
  *(uint32_t*)0x20001c9c = 0x10;
  *(uint64_t*)0x20001ca0 = 0;
  *(uint32_t*)0x20001ca8 = 0;
  *(uint32_t*)0x20001cac = 0;
  *(uint32_t*)0x20001cb0 = 0;
  *(uint32_t*)0x20001cb4 = 0;
  *(uint64_t*)0x20001cb8 = 0;
  *(uint64_t*)0x20001cc0 = 0;
  *(uint32_t*)0x20001cc8 = 0x10;
  *(uint32_t*)0x20001ccc = 0;
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20001c40ul, /*size=*/0x80ul);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x20000000, "cgroup2\000", 8);
  res = syscall(__NR_fsopen, /*type=*/0x20000000ul, /*flags=*/0ul);
  if (res != -1)
    r[2] = res;
  syscall(__NR_fsconfig, /*fd=*/r[2], /*cmd=*/6ul, /*key=*/0ul, /*value=*/0ul,
          /*aux=*/0ul);
  res =
      syscall(__NR_fsmount, /*fs_fd=*/r[2], /*flags=*/0ul, /*attr_flags=*/0ul);
  if (res != -1)
    r[3] = res;
  *(uint32_t*)0x200003c0 = r[1];
  *(uint32_t*)0x200003c4 = r[3];
  *(uint32_t*)0x200003c8 = 0xd;
  *(uint32_t*)0x200003cc = 0;
  syscall(__NR_bpf, /*cmd=*/0x1cul, /*arg=*/0x200003c0ul, /*size=*/0x10ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}