// https://syzkaller.appspot.com/bug?id=401730da81cc65b97da6fa48aa9c0d392463f1b5
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.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 exitf(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(kRetryStatus);
}

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 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 int inject_fault(int nth)
{
  int fd;
  char buf[16];

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

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

void loop()
{
  while (1) {
    execute_one();
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
void execute_one()
{
  long res = 0;
  memcpy((void*)0x20000040,
         "\x6e\x65\x74\x2f\x64\x65\x76\x5f\x6d\x63\x61\x73\x74\x00\xc0\x87\xea"
         "\x55\x01\x1e\x14\xc9\xe3\x47\xdd\x1f\x55\xa6\x02\x6a\x1c\xb7\xe0\x67"
         "\xf3\xc5\x77\x98\x1c\x09\x94\xa1\xe8\x0d\x90\xd4\x9d\x68\xbd\xbc\x91"
         "\xfa\xb9\xc1\xc7\xf0\x63\xe6\x76\xe8\x3c\x74\x0e\x2d\x64\x75\x34\xa1"
         "\x04\x58\x50\xa2\x36\x65\xd8\x1c\xa0\x72\x70\x19\x3f\x5d\x00\x3c\x10"
         "\xe3\x42\x39\x84\x4c\x5b\x6e\x8d\x17\x21\xc0\xb5\x3a\x91\xc2\xf6\xec"
         "\x1e\x54\x84\x64\x5d\xb3\xdf",
         109);
  res = syz_open_procfs(0, 0x20000040);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20865ff5, "clear_refs", 11);
  res = syz_open_procfs(0, 0x20865ff5);
  if (res != -1)
    r[1] = res;
  syscall(__NR_mmap, 0x20000000, 0x8e3000, 3, 0x10, -1, 0);
  *(uint64_t*)0x2058f000 = 0xf;
  write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
  write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
  inject_fault(0);
  syscall(__NR_sendfile, r[1], r[0], 0x2058f000, 0x100000000);
}

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