// https://syzkaller.appspot.com/bug?id=e279f1b7696487ed45f2684d754a1fe5a6262c77
// 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[3] = {0xffffffffffffffff, 0x0, 0x0};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    memcpy((void*)0x20002040, "./file0\000", 8);
    syscall(__NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x20002040ul,
            /*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", 2);
    *(uint8_t*)0x20002142 = 0x3d;
    sprintf((char*)0x20002143, "0x%016llx", (long long)r[0]);
    *(uint8_t*)0x20002155 = 0x2c;
    memcpy((void*)0x20002156, "rootmode", 8);
    *(uint8_t*)0x2000215e = 0x3d;
    sprintf((char*)0x2000215f, "%023llo", (long long)0x4000);
    *(uint8_t*)0x20002176 = 0x2c;
    memcpy((void*)0x20002177, "user_id", 7);
    *(uint8_t*)0x2000217e = 0x3d;
    sprintf((char*)0x2000217f, "%020llu", (long long)0);
    *(uint8_t*)0x20002193 = 0x2c;
    memcpy((void*)0x20002194, "group_id", 8);
    *(uint8_t*)0x2000219c = 0x3d;
    sprintf((char*)0x2000219d, "%020llu", (long long)0);
    *(uint8_t*)0x200021b1 = 0x2c;
    *(uint8_t*)0x200021b2 = 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;
    break;
  case 4:
    *(uint32_t*)0x20004200 = 0x50;
    *(uint32_t*)0x20004204 = 0;
    *(uint64_t*)0x20004208 = r[1];
    *(uint32_t*)0x20004210 = 7;
    *(uint32_t*)0x20004214 = 0x1f;
    *(uint32_t*)0x20004218 = 0;
    *(uint32_t*)0x2000421c = 0xeea390;
    *(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*)0x20000080, "./file0/file0/file0/file0/file0\000", 32);
    syscall(__NR_readlink, /*path=*/0x20000080ul, /*buf=*/0x20000fc0ul,
            /*siz=*/0x1000ul);
    break;
  case 6:
    res =
        syscall(__NR_read, /*fd=*/r[0], /*buf=*/0x20004280ul, /*len=*/0x2020ul);
    if (res != -1)
      r[2] = *(uint64_t*)0x20004288;
    break;
  case 7:
    *(uint32_t*)0x20000300 = 0xa0;
    *(uint32_t*)0x20000304 = 0;
    *(uint64_t*)0x20000308 = r[2];
    *(uint64_t*)0x20000310 = 5;
    *(uint64_t*)0x20000318 = 2;
    *(uint64_t*)0x20000320 = 7;
    *(uint64_t*)0x20000328 = 0x3f;
    *(uint32_t*)0x20000330 = 3;
    *(uint32_t*)0x20000334 = 0xff;
    *(uint64_t*)0x20000338 = 3;
    *(uint64_t*)0x20000340 = 7;
    *(uint64_t*)0x20000348 = 0x81;
    *(uint64_t*)0x20000350 = 8;
    *(uint64_t*)0x20000358 = 2;
    *(uint64_t*)0x20000360 = 8;
    *(uint32_t*)0x20000368 = 6;
    *(uint32_t*)0x2000036c = 4;
    *(uint32_t*)0x20000370 = 0x481;
    *(uint32_t*)0x20000374 = 0x8000;
    *(uint32_t*)0x20000378 = 1;
    *(uint32_t*)0x2000037c = 0;
    *(uint32_t*)0x20000380 = 0;
    *(uint32_t*)0x20000384 = 0x7ff;
    *(uint32_t*)0x20000388 = 1;
    *(uint32_t*)0x2000038c = 0;
    *(uint64_t*)0x20000390 = 0;
    *(uint32_t*)0x20000398 = 2;
    *(uint32_t*)0x2000039c = 0;
    syscall(__NR_write, /*fd=*/r[0], /*arg=*/0x20000300ul, /*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;
}