// https://syzkaller.appspot.com/bug?id=61ec9b78979c77b478704a46b43300223433acfe
// 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_procfs(uintptr_t a0, uintptr_t a1)
{

  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == (uintptr_t)-1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

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_lookup_dcookie
#define __NR_lookup_dcookie 253
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#ifndef __NR_fcntl
#define __NR_fcntl 55
#endif
#ifndef __NR_capset
#define __NR_capset 185
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_openat
#define __NR_openat 295
#endif
#ifndef __NR_getuid
#define __NR_getuid 24
#endif
#ifndef __NR_lseek
#define __NR_lseek 19
#endif
#ifndef __NR_prctl
#define __NR_prctl 172
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[3];
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_lookup_dcookie, 0x80000001, 0x20000000, 0x63);
    break;
  case 1:
    memcpy((void*)0x20000080, "/dev/pktcdvd/control", 21);
    r[0] = syscall(__NR_openat, 0xffffff9c, 0x20000080, 0, 0);
    break;
  case 2:
    r[1] = syscall(__NR_mmap, 0x20ffc000, 0x2000, 0x2000003, 0x90050, -1, 0);
    break;
  case 3:
    *(uint64_t*)0x200000c0 = r[1];
    *(uint64_t*)0x200000c8 = 0;
    *(uint32_t*)0x200000d0 = 0;
    *(uint32_t*)0x200000d4 = 0;
    syscall(__NR_ioctl, r[0], 0xc018620b, 0x200000c0);
    break;
  case 4:
    memcpy((void*)0x20e94efc, "stack", 6);
    r[2] = syz_open_procfs(0, 0x20e94efc);
    break;
  case 5:
    syscall(__NR_getuid);
    break;
  case 6:
    syscall(__NR_fcntl, r[2], 8, 0);
    break;
  case 7:
    *(uint32_t*)0x20000000 = 0x200f1526;
    *(uint32_t*)0x20000004 = 0;
    *(uint32_t*)0x20000040 = 5;
    *(uint32_t*)0x20000044 = 1;
    *(uint32_t*)0x20000048 = 2;
    *(uint32_t*)0x2000004c = 0xfffffff7;
    *(uint32_t*)0x20000050 = 6;
    *(uint32_t*)0x20000054 = 0xfff;
    syscall(__NR_capset, 0x20000000, 0x20000040);
    break;
  case 8:
    syscall(__NR_ioctl, r[2], 0x4b3a, 0x8f);
    break;
  case 9:
    syscall(__NR_lseek, r[2], 0x5c, 0);
    break;
  case 10:
    syscall(__NR_prctl, 0);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(11);
  collide = 1;
  execute(11);
}

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