// https://syzkaller.appspot.com/bug?id=be49c2247d07ad4a4faa018ebea0432f6f0c1a82
// 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 386
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#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 (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 15000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

void execute_one(void)
{
  *(uint32_t*)0x20000180 = 6;
  *(uint32_t*)0x20000184 = 4;
  *(uint64_t*)0x20000188 = 0x20000580;
  memcpy(
      (void*)0x20000580,
      "\x18\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85\x00"
      "\x00\x00\x41\x00\x00\x00\x95\x00\x00\x00\x00\x00\x00\x00\x4b\xe9\x89\x11"
      "\xed\x52\x3c\xf4\x45\x1d\x51\xe4\x00\xcb\xd3\x0e\xfb\xb0\xa7\x3c\xeb\x2b"
      "\x8f\x0a\x45\x6c\x3a\x6c\xfd\x12\x78\x68\xad\x3f\xe3\xf9\xa9\xb9\x46\xc9"
      "\x7f\x9f\xc0\x91\xe4\xc3\xf4\xb0\xa0\xd7\xed\x29\x87\x17\xa4\x80\xc4\x88"
      "\x68\x56\x2f\x04\x00\x59\x72\xb6\xa5\x26\x55\x19\xfe\xe4\xcb\x1b\x8b\x93"
      "\xf0\xb1\x64\x77\x0f\xd4\x0c\x7a\x80\x60\xce\x72\xbe\xff\x7c\xda\x17\x7e"
      "\x28\xa1\xa9\x7b\x2c\x8c\x56\xa3\xf1\x5b\x2f\x7a\x9b\x7a\xe2\x95\x09\x52"
      "\x17\xbf\xf8\xc9\x44\x1a\x45\xfd\x00\x00\x00\x00\x00\x00\x00",
      159);
  *(uint64_t*)0x20000190 = 0x200000c0;
  memcpy((void*)0x200000c0, "GPL\000", 4);
  *(uint32_t*)0x20000198 = 4;
  *(uint32_t*)0x2000019c = 0x1000;
  *(uint64_t*)0x200001a0 = 0x2062b000;
  *(uint32_t*)0x200001a8 = 0;
  *(uint32_t*)0x200001ac = 0;
  memset((void*)0x200001b0, 0, 16);
  *(uint32_t*)0x200001c0 = 0;
  *(uint32_t*)0x200001c4 = 0;
  *(uint32_t*)0x200001c8 = -1;
  *(uint32_t*)0x200001cc = 8;
  *(uint64_t*)0x200001d0 = 0;
  *(uint32_t*)0x200001d8 = 0;
  *(uint32_t*)0x200001dc = 0x10;
  *(uint64_t*)0x200001e0 = 0;
  *(uint32_t*)0x200001e8 = 0;
  *(uint32_t*)0x200001ec = 0;
  *(uint32_t*)0x200001f0 = -1;
  *(uint32_t*)0x200001f4 = 0;
  *(uint64_t*)0x200001f8 = 0;
  *(uint64_t*)0x20000200 = 0;
  *(uint32_t*)0x20000208 = 0x10;
  *(uint32_t*)0x2000020c = 0;
  syscall(__NR_bpf, /*cmd=*/5, /*arg=*/0x20000180, /*size=*/0x70);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000, /*len=*/0x1000, /*prot=*/0,
          /*flags=*/0x32, /*fd=*/-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x20000000, /*len=*/0x1000000, /*prot=*/7,
          /*flags=*/0x32, /*fd=*/-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x21000000, /*len=*/0x1000, /*prot=*/0,
          /*flags=*/0x32, /*fd=*/-1, /*offset=*/0);
  loop();
  return 0;
}