// 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>

#include <stdint.h>
#include <string.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;
      }
    }
  }
}

#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_readv
#define __NR_readv 145
#endif
#ifndef __NR_write
#define __NR_write 4
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[1];
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfc1000, 0x3, 0x32, 0xffffffff,
            0x0);
    break;
  case 1:
    memcpy((void*)0x2002a000, "/dev/sg#", 9);
    r[0] = syz_open_dev(0x2002a000, 0x0, 0x142);
    break;
  case 2:
    *(uint32_t*)0x20fbff90 = 0x20c4afc1;
    *(uint32_t*)0x20fbff94 = 0xb7;
    *(uint32_t*)0x20fbff98 = 0x2086d000;
    *(uint32_t*)0x20fbff9c = 0x0;
    *(uint32_t*)0x20fbffa0 = 0x207ac000;
    *(uint32_t*)0x20fbffa4 = 0x0;
    *(uint32_t*)0x20fbffa8 = 0x20ddaf7e;
    *(uint32_t*)0x20fbffac = 0x0;
    *(uint32_t*)0x20fbffb0 = 0x20fbf000;
    *(uint32_t*)0x20fbffb4 = 0x0;
    *(uint32_t*)0x20fbffb8 = 0x20fbf000;
    *(uint32_t*)0x20fbffbc = 0x0;
    *(uint32_t*)0x20fbffc0 = 0x2093d000;
    *(uint32_t*)0x20fbffc4 = 0x0;
    syscall(__NR_readv, r[0], 0x20fbff90, 0x7);
    break;
  case 3:
    memcpy((void*)0x20016f2f,
           "\xae\x68\xb4\x1f\xaf\x67\x33\xc7\x68\xd9\xc7\x01\x80\x00"
           "\x00\xd6\x7d\xba\xa0\x10\x44\xc0\xd2\x66\x18\x82\x9a\x68"
           "\xb0\x1b\x6e\x8d\xec\xa9\x3b\x15\x9d\x00\xb4\x42\x48\x6f"
           "\x36\x2b\x69\x6d\x4a\x1d\x3b\x24\x76\x08\x8d\xbc\xbf\xae"
           "\x2b\x59\x28\x39\x71\x77\x5e\x7b\xfe\x1a\x71\x83\xbd\xb4"
           "\x45\x2a\x9c\xc9\x51\x85\x13\x48\x92\x51\x16\x42\x2e\x2c"
           "\x04\xeb\x79\xb4",
           88);
    syscall(__NR_write, r[0], 0x20016f2f, 0x58);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(4);
  collide = 1;
  execute(4);
}

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