// https://syzkaller.appspot.com/bug?id=f9975a4b2508ac57a378621a455bbca1242544e4
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

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 int collide;

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);
        if (collide && call % 2)
          break;
        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_bpf
#define __NR_bpf 321
#endif

long r[4];
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    *(uint32_t*)0x20a41000 = 1;
    *(uint32_t*)0x20a41004 = 3;
    *(uint64_t*)0x20a41008 = 0x209ff000;
    *(uint64_t*)0x20a41010 = 0x207f4000;
    *(uint32_t*)0x20a41018 = 0x83;
    *(uint32_t*)0x20a4101c = 0xb7;
    *(uint64_t*)0x20a41020 = 0x206ab000;
    *(uint32_t*)0x20a41028 = 0;
    *(uint32_t*)0x20a4102c = 0;
    *(uint8_t*)0x20a41030 = 0;
    *(uint8_t*)0x20a41031 = 0;
    *(uint8_t*)0x20a41032 = 0;
    *(uint8_t*)0x20a41033 = 0;
    *(uint8_t*)0x20a41034 = 0;
    *(uint8_t*)0x20a41035 = 0;
    *(uint8_t*)0x20a41036 = 0;
    *(uint8_t*)0x20a41037 = 0;
    *(uint8_t*)0x20a41038 = 0;
    *(uint8_t*)0x20a41039 = 0;
    *(uint8_t*)0x20a4103a = 0;
    *(uint8_t*)0x20a4103b = 0;
    *(uint8_t*)0x20a4103c = 0;
    *(uint8_t*)0x20a4103d = 0;
    *(uint8_t*)0x20a4103e = 0;
    *(uint8_t*)0x20a4103f = 0;
    *(uint32_t*)0x20a41040 = 0;
    *(uint8_t*)0x209ff000 = 0x18;
    STORE_BY_BITMASK(uint8_t, 0x209ff001, 0, 0, 4);
    STORE_BY_BITMASK(uint8_t, 0x209ff001, 0, 4, 4);
    *(uint16_t*)0x209ff002 = 0;
    *(uint32_t*)0x209ff004 = 0;
    *(uint8_t*)0x209ff008 = 0;
    *(uint8_t*)0x209ff009 = 0;
    *(uint16_t*)0x209ff00a = 0;
    *(uint32_t*)0x209ff00c = 0;
    *(uint8_t*)0x209ff010 = 0x95;
    *(uint8_t*)0x209ff011 = 0;
    *(uint16_t*)0x209ff012 = 0;
    *(uint32_t*)0x209ff014 = 0;
    memcpy((void*)0x207f4000, "syzkaller", 10);
    r[0] = syscall(__NR_bpf, 5, 0x20a41000, 0x48);
    break;
  case 2:
    r[1] = syscall(__NR_socket, 0xa, 0x40000080806, 0);
    break;
  case 3:
    *(uint16_t*)0x2047b000 = 0xa;
    *(uint16_t*)0x2047b002 = htobe16(0x4e20);
    *(uint32_t*)0x2047b004 = 0;
    *(uint64_t*)0x2047b008 = htobe64(0);
    *(uint64_t*)0x2047b010 = htobe64(1);
    *(uint32_t*)0x2047b018 = 0;
    syscall(__NR_bind, r[1], 0x2047b000, 0x1c);
    break;
  case 4:
    syscall(__NR_listen, r[1], 5);
    break;
  case 5:
    r[2] = syscall(__NR_socket, 0xa, 6, 0);
    break;
  case 6:
    *(uint32_t*)0x20b21000 = 0;
    *(uint32_t*)0x20b21004 = 0x80000;
    *(uint32_t*)0x20b21008 = -1;
    syscall(__NR_ioctl, -1, 0xc00c642d, 0x20b21000);
    break;
  case 7:
    *(uint16_t*)0x20419000 = 0xa;
    *(uint16_t*)0x20419002 = htobe16(0x4e20);
    *(uint32_t*)0x20419004 = 0xfffffff8;
    *(uint64_t*)0x20419008 = htobe64(0);
    *(uint64_t*)0x20419010 = htobe64(1);
    *(uint32_t*)0x20419018 = 0;
    syscall(__NR_connect, r[2], 0x20419000, 0x1c);
    break;
  case 8:
    r[3] = syscall(__NR_socket, 0x29, 2, 0);
    break;
  case 9:
    *(uint32_t*)0x20bc7ff8 = r[1];
    *(uint32_t*)0x20bc7ffc = r[0];
    syscall(__NR_ioctl, r[3], 0x89e0, 0x20bc7ff8);
    break;
  case 10:
    break;
  }
}

void loop()
{
  memset(r, -1, sizeof(r));
  execute(11);
  collide = 1;
  execute(11);
}

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