// https://syzkaller.appspot.com/bug?id=4a021a59298be53e9addad8d5f11fe597625281f
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}

#include <stdint.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 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) {
    close(fd);
    return false;
  }
  close(fd);
  return true;
}

static int inject_fault(int nth)
{
  int fd;
  char buf[128];

  sprintf(buf, "/proc/self/task/%d/fail-nth", (int)syscall(SYS_gettid));
  fd = open(buf, O_RDWR);
  if (fd == -1)
    fail("failed to open /proc/self/task/tid/fail-nth");
  sprintf(buf, "%d", nth + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    fail("failed to write /proc/self/task/tid/fail-nth");
  return fd;
}

long r[5];
void loop()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  memcpy((void*)0x20ae0ff4,
         "\x2e\x2f\x66\x69\x6c\x65\x30\x2f\x62\x75\x73\x00", 12);
  memcpy((void*)0x2059e000, "\x2e\x2e", 2);
  memcpy((void*)0x20e3b000, "\x64\x65\x76\x70\x74\x73\x00", 7);
  write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
  write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
  inject_fault(9);
  r[4] = syscall(__NR_mount, 0x20ae0ff4ul, 0x2059e000ul, 0x20e3b000ul,
                 0x0ul, 0x20000000ul);
}

int main()
{
  loop();
  return 0;
}