// https://syzkaller.appspot.com/bug?id=4462682cd32aee8ff03a43c8b9be3963743bc506
// autogenerated by syzkaller (http://github.com/google/syzkaller)

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

static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

static void test();

void loop()
{
  while (1) {
    test();
  }
}

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;
      }
    }
  }
}

long r[1];
void execute_call(int call)
{
  switch (call) {
  case 0:
    memcpy((void*)0x20a13000, "/dev/sg#", 9);
    r[0] = syz_open_dev(0x20a13000, 0, 0x8002);
    break;
  case 1:
    *(uint64_t*)0x20000780 = 0x20000180;
    *(uint64_t*)0x20000788 = 0;
    *(uint64_t*)0x20000790 = 0x200001c0;
    *(uint64_t*)0x20000798 = 0x90;
    *(uint64_t*)0x200007a0 = 0x20000280;
    *(uint64_t*)0x200007a8 = 0xf8;
    *(uint64_t*)0x200007b0 = 0x20000380;
    *(uint64_t*)0x200007b8 = 0xf6;
    *(uint64_t*)0x200007c0 = 0x20000480;
    *(uint64_t*)0x200007c8 = 0x71;
    *(uint64_t*)0x200007d0 = 0x20000500;
    *(uint64_t*)0x200007d8 = 0x70;
    *(uint64_t*)0x200007e0 = 0x20000580;
    *(uint64_t*)0x200007e8 = 0x4c;
    *(uint64_t*)0x200007f0 = 0x20000600;
    *(uint64_t*)0x200007f8 = 0xd4;
    *(uint64_t*)0x20000800 = 0x20000700;
    *(uint64_t*)0x20000808 = 0x6e;
    syscall(__NR_readv, r[0], 0x20000780, 9);
    break;
  case 2:
    *(uint8_t*)0x201d6ee0 = 0;
    *(uint8_t*)0x201d6ee1 = 0;
    *(uint8_t*)0x201d6ee2 = 0;
    *(uint8_t*)0x201d6ee3 = 0;
    *(uint64_t*)0x201d6ee8 = 0;
    *(uint64_t*)0x201d6ef0 = 0;
    *(uint8_t*)0x201d6ef8 = 0;
    *(uint8_t*)0x201d6ef9 = 0;
    *(uint8_t*)0x201d6efa = 0;
    *(uint8_t*)0x201d6efb = 0;
    *(uint32_t*)0x201d6f00 = 0;
    *(uint32_t*)0x201d6f04 = 0;
    syscall(__NR_write, r[0], 0x201d6ee0, 0x30);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(3);
  collide = 1;
  execute(3);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (;;) {
    loop();
  }
}