// https://syzkaller.appspot.com/bug?id=5735d842f7ea3ed9220aca64952ac4aba7ba741c
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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 <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include <string.h>

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  struct sigaction sa;

  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

static uintptr_t syz_open_procfs(uintptr_t a0, uintptr_t a1)
{

  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    NONFAILING(snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1));
  } else if (a0 == (uintptr_t)-1) {
    NONFAILING(snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1));
  } else {
    NONFAILING(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;

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

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

#ifndef __NR_userfaultfd
#define __NR_userfaultfd 323
#endif

uint64_t r[6] = {0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0x0,
                 0xffffffffffffffff, 0xffffffffffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    syscall(__NR_socket, 0x10, 3, 0);
    break;
  case 1:
    syscall(__NR_mmap, 0x20011000, 0x3000, 4, 0x32, -1, 0);
    break;
  case 2:
    res = syscall(__NR_userfaultfd, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 3:
    NONFAILING(*(uint64_t*)0x20000fe8 = 0xaa);
    NONFAILING(*(uint64_t*)0x20000ff0 = 0);
    NONFAILING(*(uint64_t*)0x20000ff8 = 0);
    syscall(__NR_ioctl, r[0], 0xc018aa3f, 0x20000fe8);
    break;
  case 4:
    syscall(__NR_epoll_create1, 0x80000);
    break;
  case 5:
    NONFAILING(*(uint64_t*)0x20000000 = 0x20012000);
    NONFAILING(*(uint64_t*)0x20000008 = 0x2000);
    NONFAILING(*(uint64_t*)0x20000010 = 1);
    NONFAILING(*(uint64_t*)0x20000018 = 0);
    syscall(__NR_ioctl, r[0], 0xc020aa00, 0x20000000);
    break;
  case 6:
    res = syscall(__NR_socket, 2, 1, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 7:
    res = syscall(__NR_dup, r[1]);
    if (res != -1)
      r[2] = res;
    break;
  case 8:
    NONFAILING(*(uint32_t*)0x20012ffc = 4);
    syscall(__NR_getsockopt, r[2], 6, 0x1f, 0x20000040, 0x20012ffc);
    break;
  case 9:
    NONFAILING(*(uint64_t*)0x20000080 = 0x20338000);
    NONFAILING(*(uint64_t*)0x20000088 = 0x3000);
    NONFAILING(*(uint64_t*)0x20000090 = 0);
    NONFAILING(*(uint64_t*)0x20000098 = 0);
    syscall(__NR_ioctl, -1, 0xc020aa00, 0x20000080);
    break;
  case 10:
    NONFAILING(*(uint32_t*)0x20000200 = 0);
    NONFAILING(*(uint16_t*)0x20000204 = 2);
    NONFAILING(*(uint16_t*)0x20000206 = htobe16(0x4e20));
    NONFAILING(*(uint8_t*)0x20000208 = 0xac);
    NONFAILING(*(uint8_t*)0x20000209 = 0x14);
    NONFAILING(*(uint8_t*)0x2000020a = 0x14);
    NONFAILING(*(uint8_t*)0x2000020b = 0xbb);
    NONFAILING(*(uint8_t*)0x2000020c = 0);
    NONFAILING(*(uint8_t*)0x2000020d = 0);
    NONFAILING(*(uint8_t*)0x2000020e = 0);
    NONFAILING(*(uint8_t*)0x2000020f = 0);
    NONFAILING(*(uint8_t*)0x20000210 = 0);
    NONFAILING(*(uint8_t*)0x20000211 = 0);
    NONFAILING(*(uint8_t*)0x20000212 = 0);
    NONFAILING(*(uint8_t*)0x20000213 = 0);
    NONFAILING(*(uint32_t*)0x20000284 = 2);
    NONFAILING(*(uint32_t*)0x20000288 = 8);
    NONFAILING(*(uint32_t*)0x2000028c = 5);
    NONFAILING(*(uint32_t*)0x20000290 = 0x80);
    NONFAILING(*(uint32_t*)0x20000294 = 0xfffffff9);
    NONFAILING(*(uint32_t*)0x200002c0 = 0x98);
    res = syscall(__NR_getsockopt, r[2], 0x84, 0xf, 0x20000200, 0x200002c0);
    if (res != -1)
      NONFAILING(r[3] = *(uint32_t*)0x20000200);
    break;
  case 11:
    NONFAILING(*(uint32_t*)0x20000300 = r[3]);
    NONFAILING(*(uint32_t*)0x20000304 = 8);
    NONFAILING(*(uint32_t*)0x20000340 = 8);
    syscall(__NR_getsockopt, r[2], 0x84, 0x13, 0x20000300, 0x20000340);
    break;
  case 12:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x4000000000000032, r[0], 0);
    break;
  case 13:
    res = syscall(__NR_userfaultfd, 0);
    if (res != -1)
      r[4] = res;
    break;
  case 14:
    syscall(__NR_getdents, r[2], 0x20000380, 0x81);
    break;
  case 15:
    NONFAILING(*(uint64_t*)0x20006000 = 0xaa);
    NONFAILING(*(uint64_t*)0x20006008 = 0);
    NONFAILING(*(uint64_t*)0x20006010 = 0);
    syscall(__NR_ioctl, r[4], 0xc018aa3f, 0x20006000);
    break;
  case 16:
    NONFAILING(memcpy((void*)0x200000c0, "tls", 4));
    syscall(__NR_setsockopt, r[2], 6, 0x1f, 0x200000c0, 4);
    break;
  case 17:
    NONFAILING(memcpy((void*)0x20000100, "\x66\x69\x6c\x74\x65\x72\x00\x00\x00"
                                         "\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                                         "\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                                         "\x00\x00\x00\x00\x00",
                      32));
    NONFAILING(*(uint32_t*)0x20000120 = 0);
    NONFAILING(*(uint32_t*)0x20000124 = 0);
    NONFAILING(*(uint32_t*)0x20000128 = 0);
    NONFAILING(*(uint32_t*)0x2000012c = 0);
    NONFAILING(*(uint32_t*)0x20000130 = 0);
    NONFAILING(*(uint32_t*)0x20000134 = 0);
    NONFAILING(*(uint32_t*)0x20000138 = 0);
    NONFAILING(*(uint32_t*)0x2000013c = 0);
    NONFAILING(*(uint32_t*)0x20000140 = 0);
    NONFAILING(*(uint32_t*)0x20000180 = 0x44);
    syscall(__NR_getsockopt, r[1], 0, 0x60, 0x20000100, 0x20000180);
    break;
  case 18:
    NONFAILING(memcpy(
        (void*)0x200001c0,
        "\x67\x72\x65\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        16));
    NONFAILING(*(uint16_t*)0x200001d0 = 0xa200);
    syscall(__NR_ioctl, r[2], 0x400454ca, 0x200001c0);
    break;
  case 19:
    NONFAILING(memcpy((void*)0x200002c0,
                      "\x2f\x65\x78\x65\x00\x00\x00\x00\x00\x04\x09\x00\x4b\xdd"
                      "\xd9\xde\x91\xbe\x10\xee\xbf\x00\x0e\xe9\xa9\x0f\x79\x80"
                      "\x58\x43\x9e\xd5\x54\xfa\x07\x00\x4a\xde\xe9\x01\xd2\xda"
                      "\x75\xaf\x1f\x02\x00\x02\x00\x00\x00\xa0\x71\x39\xf4\x82"
                      "\xac\xe3\x65\x4c",
                      60));
    res = syz_open_procfs(0, 0x200002c0);
    if (res != -1)
      r[5] = res;
    break;
  case 20:
    syscall(__NR_fcntl, r[5], 4, 0x4000);
    break;
  case 21:
    syscall(__NR_mmap, 0x20000000, 0xb36000, 3, 0x8031, -1, 0);
    break;
  case 22:
    syscall(__NR_read, r[5], 0x20000200, 0x8000);
    break;
  }
}

void execute_one()
{
  execute(23);
}

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