// https://syzkaller.appspot.com/bug?id=9f640e969e36776be02eb136b1f0a75fc6f5ed49
// 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);
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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;
  }
}

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)
{
  int i, call, thread;
  for (call = 0; call < 5; 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);
      if (call == 2)
        break;
      event_timedwait(&th->done,
                      50 + (call == 2 ? 500 : 0) + (call == 4 ? 500 : 0));
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    syscall(__NR_unshare, 0x8000400ul);
    break;
  case 1:
    *(uint32_t*)0x200008c0 = 5;
    *(uint32_t*)0x200008c4 = 1;
    *(uint32_t*)0x200008c8 = 9;
    *(uint32_t*)0x200008cc = 2;
    *(uint32_t*)0x200008d0 = 0x141;
    *(uint32_t*)0x200008d4 = -1;
    *(uint32_t*)0x200008d8 = 0;
    memset((void*)0x200008dc, 0, 16);
    *(uint32_t*)0x200008ec = 0;
    *(uint32_t*)0x200008f0 = -1;
    *(uint32_t*)0x200008f4 = 0;
    *(uint32_t*)0x200008f8 = 0;
    *(uint32_t*)0x200008fc = 0;
    *(uint64_t*)0x20000900 = 0;
    syscall(__NR_bpf, 0ul, 0x200008c0ul, 0x48ul);
    break;
  case 2:
    syscall(__NR_bpf, 5ul, 0ul, 0ul);
    break;
  case 3:
    *(uint32_t*)0x20000140 = 0xa;
    *(uint32_t*)0x20000144 = 0x16;
    *(uint32_t*)0x20000148 = 8;
    *(uint32_t*)0x2000014c = 0x7f;
    *(uint32_t*)0x20000150 = 0;
    *(uint32_t*)0x20000154 = -1;
    *(uint32_t*)0x20000158 = 0;
    memset((void*)0x2000015c, 0, 16);
    *(uint32_t*)0x2000016c = 0;
    *(uint32_t*)0x20000170 = -1;
    *(uint32_t*)0x20000174 = 0;
    *(uint32_t*)0x20000178 = 0;
    *(uint32_t*)0x2000017c = 0;
    *(uint64_t*)0x20000180 = 0;
    res = syscall(__NR_bpf, 0x100000000000000ul, 0x20000140ul, 0x48ul);
    if (res != -1)
      r[0] = res;
    break;
  case 4:
    *(uint32_t*)0x20000440 = 0x11;
    *(uint32_t*)0x20000444 = 7;
    *(uint64_t*)0x20000448 = 0x200000c0;
    *(uint8_t*)0x200000c0 = 0x18;
    STORE_BY_BITMASK(uint8_t, , 0x200000c1, 8, 0, 4);
    STORE_BY_BITMASK(uint8_t, , 0x200000c1, 0, 4, 4);
    *(uint16_t*)0x200000c2 = 0;
    *(uint32_t*)0x200000c4 = 0;
    *(uint8_t*)0x200000c8 = 0;
    *(uint8_t*)0x200000c9 = 0;
    *(uint16_t*)0x200000ca = 0;
    *(uint32_t*)0x200000cc = 0;
    *(uint8_t*)0x200000d0 = 0x18;
    STORE_BY_BITMASK(uint8_t, , 0x200000d1, 0, 0, 4);
    STORE_BY_BITMASK(uint8_t, , 0x200000d1, 1, 4, 4);
    *(uint16_t*)0x200000d2 = 0;
    *(uint32_t*)0x200000d4 = r[0];
    *(uint8_t*)0x200000d8 = 0;
    *(uint8_t*)0x200000d9 = 0;
    *(uint16_t*)0x200000da = 0;
    *(uint32_t*)0x200000dc = 0;
    *(uint8_t*)0x200000e0 = 0x18;
    STORE_BY_BITMASK(uint8_t, , 0x200000e1, 0, 0, 4);
    STORE_BY_BITMASK(uint8_t, , 0x200000e1, 1, 4, 4);
    *(uint16_t*)0x200000e2 = 0;
    *(uint32_t*)0x200000e4 = r[0];
    *(uint8_t*)0x200000e8 = 0;
    *(uint8_t*)0x200000e9 = 0;
    *(uint16_t*)0x200000ea = 0;
    *(uint32_t*)0x200000ec = 0;
    *(uint8_t*)0x200000f0 = 0x95;
    *(uint8_t*)0x200000f1 = 0;
    *(uint16_t*)0x200000f2 = 0;
    *(uint32_t*)0x200000f4 = 0;
    *(uint64_t*)0x20000450 = 0x20000000;
    memcpy((void*)0x20000000, "GPL\000", 4);
    *(uint32_t*)0x20000458 = 4;
    *(uint32_t*)0x2000045c = 0xee;
    *(uint64_t*)0x20000460 = 0x20000340;
    *(uint32_t*)0x20000468 = 0;
    *(uint32_t*)0x2000046c = 0;
    memset((void*)0x20000470, 0, 16);
    *(uint32_t*)0x20000480 = 0;
    *(uint32_t*)0x20000484 = 0;
    *(uint32_t*)0x20000488 = -1;
    *(uint32_t*)0x2000048c = 8;
    *(uint64_t*)0x20000490 = 0;
    *(uint32_t*)0x20000498 = 0;
    *(uint32_t*)0x2000049c = 0x10;
    *(uint64_t*)0x200004a0 = 0;
    *(uint32_t*)0x200004a8 = 0;
    *(uint32_t*)0x200004ac = 0;
    *(uint32_t*)0x200004b0 = 0;
    *(uint32_t*)0x200004b4 = 0;
    *(uint64_t*)0x200004b8 = 0;
    syscall(__NR_bpf, 5ul, 0x20000440ul, 0x80ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  loop();
  return 0;
}