// https://syzkaller.appspot.com/bug?id=cc9f4ab3d1198237b0ee1f751ca02e21f8d46445
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static uintptr_t syz_open_procfs(uintptr_t a0, uintptr_t a1)
{

  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == (uintptr_t)-1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

static void execute_one();
extern unsigned long long procid;

static void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      execute_one();
      int fd;
      for (fd = 3; fd < 30; fd++)
        close(fd);
      doexit(0);
    }

    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid) {
        break;
      }
      usleep(1000);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill(-pid, SIGKILL);
      kill(pid, SIGKILL);
      while (waitpid(-1, &status, __WALL) != pid) {
      }
      break;
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
void execute_one()
{
  long res = 0;
  memcpy((void*)0x20fd5ff8, "./file0", 8);
  syscall(__NR_mkdir, 0x20fd5ff8, 0);
  res = syscall(__NR_epoll_create1, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 2, 1, 0);
  if (res != -1)
    r[1] = res;
  *(uint32_t*)0x20000480 = 0;
  *(uint64_t*)0x20000484 = 0;
  syscall(__NR_epoll_ctl, r[0], 1, r[1], 0x20000480);
  memcpy((void*)0x20000100, "mounts", 7);
  res = syz_open_procfs(0, 0x20000100);
  if (res != -1)
    r[2] = res;
  memcpy((void*)0x20001140, "./file0", 8);
  memcpy((void*)0x20001180, "9p", 3);
  memcpy((void*)0x20001340, "trans=fd,", 9);
  memcpy((void*)0x20001349, "rfdno", 5);
  *(uint8_t*)0x2000134e = 0x3d;
  sprintf((char*)0x2000134f, "0x%016llx", (long long)r[2]);
  *(uint8_t*)0x20001361 = 0x2c;
  memcpy((void*)0x20001362, "wfdno", 5);
  *(uint8_t*)0x20001367 = 0x3d;
  sprintf((char*)0x20001368, "0x%016llx", (long long)r[0]);
  *(uint8_t*)0x2000137a = 0x2c;
  *(uint8_t*)0x2000137b = 0;
  syscall(__NR_mount, 0, 0x20001140, 0x20001180, 0, 0x20001340);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (;;) {
    loop();
  }
}