// https://syzkaller.appspot.com/bug?id=92562d75911aa205315d8ca816ab805888c6e989
// 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>

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;
  }
}

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 < 8; 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);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

uint64_t r[5] = {0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    memcpy((void*)0x20000400, "./file0\000", 8);
    syscall(__NR_mkdir, /*path=*/0x20000400ul, /*mode=*/0ul);
    break;
  case 1:
    memcpy((void*)0x20002080, "/dev/fuse\000", 10);
    res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                  /*file=*/0x20002080ul, /*flags=*/0x42ul, /*mode=*/0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    memcpy((void*)0x200020c0, "./file0\000", 8);
    memcpy((void*)0x20002100, "fuse\000", 5);
    memcpy((void*)0x20002140, "fd=", 3);
    sprintf((char*)0x20002143, "0x%016llx", (long long)r[0]);
    memcpy((void*)0x20002155, ",rootmode=0000000000000000040000,user_id=", 41);
    sprintf((char*)0x2000217e, "%020llu", (long long)0);
    memcpy((void*)0x20002192, ",group_id=", 10);
    sprintf((char*)0x2000219c, "%020llu", (long long)0);
    syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200020c0ul,
            /*type=*/0x20002100ul, /*flags=*/0ul, /*opts=*/0x20002140ul);
    break;
  case 3:
    res =
        syscall(__NR_read, /*fd=*/r[0], /*buf=*/0x200021c0ul, /*len=*/0x2020ul);
    if (res != -1) {
      r[1] = *(uint64_t*)0x200021c8;
      r[2] = *(uint32_t*)0x200021d0;
      r[3] = *(uint32_t*)0x200021d4;
    }
    break;
  case 4:
    *(uint32_t*)0x20004200 = 0x50;
    *(uint32_t*)0x20004204 = 0;
    *(uint64_t*)0x20004208 = r[1];
    *(uint32_t*)0x20004210 = 7;
    *(uint32_t*)0x20004214 = 0x27;
    *(uint32_t*)0x20004218 = 0;
    *(uint32_t*)0x2000421c = 0;
    *(uint16_t*)0x20004220 = 0;
    *(uint16_t*)0x20004222 = 0;
    *(uint32_t*)0x20004224 = 0;
    *(uint32_t*)0x20004228 = 0;
    *(uint16_t*)0x2000422c = 0;
    *(uint16_t*)0x2000422e = 0;
    memset((void*)0x20004230, 0, 32);
    syscall(__NR_write, /*fd=*/r[0], /*arg=*/0x20004200ul, /*len=*/0x50ul);
    break;
  case 5:
    memcpy((void*)0x20000100, "./file0/../file0/file0\000", 23);
    memcpy((void*)0x20000140, "./file0/../file0/file0\000", 23);
    syscall(__NR_rename, /*old=*/0x20000100ul, /*new=*/0x20000140ul);
    break;
  case 6:
    res =
        syscall(__NR_read, /*fd=*/r[0], /*buf=*/0x2000aa40ul, /*len=*/0x2020ul);
    if (res != -1)
      r[4] = *(uint64_t*)0x2000aa48;
    break;
  case 7:
    *(uint32_t*)0x20000000 = 0xa0;
    *(uint32_t*)0x20000004 = 0;
    *(uint64_t*)0x20000008 = r[4];
    *(uint64_t*)0x20000010 = 4;
    *(uint64_t*)0x20000018 = 1;
    *(uint64_t*)0x20000020 = 0x1000;
    *(uint64_t*)0x20000028 = 4;
    *(uint32_t*)0x20000030 = 0;
    *(uint32_t*)0x20000034 = 0x8001;
    *(uint64_t*)0x20000038 = 1;
    *(uint64_t*)0x20000040 = 0x5a0a;
    *(uint64_t*)0x20000048 = 0xfa;
    *(uint64_t*)0x20000050 = 6;
    *(uint64_t*)0x20000058 = 1;
    *(uint64_t*)0x20000060 = 4;
    *(uint32_t*)0x20000068 = 0x81;
    *(uint32_t*)0x2000006c = 8;
    *(uint32_t*)0x20000070 = 0x8c;
    *(uint32_t*)0x20000074 = 0x6000;
    *(uint32_t*)0x20000078 = 7;
    *(uint32_t*)0x2000007c = r[2];
    *(uint32_t*)0x20000080 = r[3];
    *(uint32_t*)0x20000084 = 0xfffff801;
    *(uint32_t*)0x20000088 = 2;
    *(uint32_t*)0x2000008c = 0;
    *(uint64_t*)0x20000090 = 0;
    *(uint32_t*)0x20000098 = 1;
    *(uint32_t*)0x2000009c = 0;
    syscall(__NR_write, /*fd=*/r[0], /*arg=*/0x20000000ul, /*len=*/0xa0ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  loop();
  return 0;
}