// https://syzkaller.appspot.com/bug?id=8cbc2fb084dca2e8cbe01f4e651e93d21b83d213
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

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 void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  int state;
} event_t;

static void event_init(event_t* ev)
{
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

const int kInitNetNsFd = 201;

static long syz_init_net_socket(volatile long domain, volatile long type,
                                volatile long proto)
{
  return syscall(__NR_socket, domain, type, proto);
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

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 (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void loop(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 6; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 50 + (call == 0 ? 500 : 0));
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    *(uint32_t*)0x20000200 = 0;
    *(uint32_t*)0x20000204 = 5;
    *(uint64_t*)0x20000208 = 0x20000000;
    memcpy(
        (void*)0x20000000,
        "\x18\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85",
        17);
    *(uint64_t*)0x20000210 = 0;
    *(uint32_t*)0x20000218 = 0;
    *(uint32_t*)0x2000021c = 0;
    *(uint64_t*)0x20000220 = 0;
    *(uint32_t*)0x20000228 = 0;
    *(uint32_t*)0x2000022c = 0;
    memset((void*)0x20000230, 0, 16);
    *(uint32_t*)0x20000240 = 0;
    *(uint32_t*)0x20000244 = 2;
    *(uint32_t*)0x20000248 = -1;
    *(uint32_t*)0x2000024c = 8;
    *(uint64_t*)0x20000250 = 0;
    *(uint32_t*)0x20000258 = 0;
    *(uint32_t*)0x2000025c = 0x10;
    *(uint64_t*)0x20000260 = 0;
    *(uint32_t*)0x20000268 = 0;
    *(uint32_t*)0x2000026c = 0;
    *(uint32_t*)0x20000270 = 0;
    *(uint32_t*)0x20000274 = 0;
    *(uint64_t*)0x20000278 = 0;
    *(uint64_t*)0x20000280 = 0;
    *(uint32_t*)0x20000288 = 0x10;
    *(uint32_t*)0x2000028c = 0;
    *(uint32_t*)0x20000290 = 0;
    syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000200ul, /*size=*/0x90ul);
    break;
  case 1:
    res = -1;
    res = syz_init_net_socket(/*fam=*/0x1f, /*type=*/5, /*proto=*/2);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    memcpy((void*)0x20000000,
           "bpq0\000\000\000\000\000\000\000\000\000\000\000\000", 16);
    syscall(__NR_setsockopt, /*fd=*/-1, /*level=*/0x101, /*optname=*/0x19,
            /*optval=*/0x20000000ul, /*optlen=*/0x10ul);
    break;
  case 3:
    syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x8914, /*arg=*/0x20000000ul);
    break;
  case 4:
    res = -1;
    res = syz_init_net_socket(/*domain=*/3, /*type=SOCK_SEQPACKET*/ 5,
                              /*proto=*/0);
    if (res != -1)
      r[1] = res;
    break;
  case 5:
    memcpy((void*)0x200002c0,
           "bpq0\000\000\000\000\000\000\000\000\000\000\000\000", 16);
    syscall(__NR_setsockopt, /*fd=*/r[1], /*level=*/0x101, /*optname=*/0x19,
            /*optval=*/0x200002c0ul, /*optlen=*/0x10ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}