// https://syzkaller.appspot.com/bug?id=a690a4d53f2013f03c95e04df5dc159cea043d88
// 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 <sys/stat.h>
#include <sys/syscall.h>
#include <sys/sysmacros.h>
#include <unistd.h>

static uintptr_t syz_fuseblk_mount(uintptr_t a0, uintptr_t a1, uintptr_t a2,
                                   uintptr_t a3, uintptr_t a4, uintptr_t a5,
                                   uintptr_t a6, uintptr_t a7)
{
  uint64_t target = a0;
  uint64_t blkdev = a1;
  uint64_t mode = a2;
  uint64_t uid = a3;
  uint64_t gid = a4;
  uint64_t maxread = a5;
  uint64_t blksize = a6;
  uint64_t flags = a7;

  int fd = open("/dev/fuse", O_RDWR);
  if (fd == -1)
    return fd;
  if (syscall(SYS_mknodat, AT_FDCWD, blkdev, S_IFBLK, makedev(7, 199)))
    return fd;
  char buf[256];
  sprintf(buf, "fd=%d,user_id=%ld,group_id=%ld,rootmode=0%o", fd, (long)uid,
          (long)gid, (unsigned)mode & ~3u);
  if (maxread != 0)
    sprintf(buf + strlen(buf), ",max_read=%ld", (long)maxread);
  if (blksize != 0)
    sprintf(buf + strlen(buf), ",blksize=%ld", (long)blksize);
  if (mode & 1)
    strcat(buf, ",default_permissions");
  if (mode & 2)
    strcat(buf, ",allow_other");
  syscall(SYS_mount, blkdev, target, "fuseblk", flags, buf);
  return fd;
}

static void execute_one();
extern unsigned long long procid;

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

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_open
#define __NR_open 5
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_mkdir
#define __NR_mkdir 39
#endif
#ifndef __NR_mount
#define __NR_mount 21
#endif
#ifndef __NR_bind
#define __NR_bind 361
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

unsigned long long procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    memcpy((void*)0x20000180, "./file0", 8);
    syscall(__NR_mkdir, 0x20000180, 0);
    break;
  case 1:
    memcpy((void*)0x2000a000, "./file0", 8);
    memcpy((void*)0x20026ff8, "./file0", 8);
    memcpy((void*)0x20000300, "ramfs", 6);
    syscall(__NR_mount, 0x2000a000, 0x20026ff8, 0x20000300, 0, 0x200007c0);
    break;
  case 2:
    memcpy((void*)0x20d04000, "./file0", 8);
    memcpy((void*)0x20903000, "./file0", 8);
    memcpy((void*)0x200007c0,
           "\x62\xb5\x95\x08\xe3\x81\x9b\x99\x66\x29\xf0\x72\x64\x65\x76\x00",
           16);
    syscall(__NR_mount, 0x20d04000, 0x20903000, 0x200007c0, 0x100000,
            0x200002c0);
    break;
  case 3:
    memcpy((void*)0x20000240, "./file0", 8);
    memcpy((void*)0x20000280, ".", 1);
    memcpy((void*)0x20000040, "\x04\x5b\x89\x8f\x73", 5);
    syscall(__NR_mount, 0x20000240, 0x20000280, 0x20000040, 0x1004, 0);
    break;
  case 4:
    memcpy((void*)0x200003c0, "./file0", 8);
    memcpy((void*)0x20000540, ".", 1);
    memcpy((void*)0x20000500,
           "\x7d\x78\x66\x73\x00\x18\xbd\x13\x6a\xe7\xf3\x5a\x30\x51\x83\xbd",
           16);
    syscall(__NR_mount, 0x200003c0, 0x20000540, 0x20000500, 0x3083, 0x20000580);
    break;
  case 5:
    memcpy((void*)0x200008c0, ".", 1);
    memcpy((void*)0x20000080, ".", 1);
    memcpy((void*)0x20753000, "mslos", 6);
    syscall(__NR_mount, 0x200008c0, 0x20000080, 0x20753000, 0x5010, 0x20000ac0);
    break;
  case 6:
    memcpy((void*)0x20fb6000, "./file0", 8);
    memcpy((void*)0x20d78000, ".", 1);
    memcpy((void*)0x20fdb000, "ubifs", 6);
    syscall(__NR_mount, 0x20fb6000, 0x20d78000, 0x20fdb000, 0x1003, 0);
    break;
  case 7:
    memcpy((void*)0x20000440, "./file0/file0", 14);
    memcpy((void*)0x20000380, "./file0/file0", 14);
    memcpy((void*)0x20000400,
           "\x6d\x73\x7a\xe6\x0e\x8c\x7e\xb7\xc6\xa6\x1e\x95\x6c\x6f\x73\xee",
           16);
    syscall(__NR_mount, 0x20000440, 0x20000380, 0x20000400, 0x5010, 0x20000640);
    break;
  case 8:
    memcpy((void*)0x200005c0, "./file0", 8);
    memcpy((void*)0x20000600, "./file0/file0", 14);
    syz_fuseblk_mount(0x200005c0, 0x20000600, 0, 0, 0, 0, 0, 0);
    break;
  case 9:
    *(uint16_t*)0x200001c0 = 0xa;
    *(uint16_t*)0x200001c2 = htobe16(0x4e21);
    *(uint32_t*)0x200001c4 = 8;
    *(uint8_t*)0x200001c8 = -1;
    *(uint8_t*)0x200001c9 = 1;
    *(uint8_t*)0x200001ca = 0;
    *(uint8_t*)0x200001cb = 0;
    *(uint8_t*)0x200001cc = 0;
    *(uint8_t*)0x200001cd = 0;
    *(uint8_t*)0x200001ce = 0;
    *(uint8_t*)0x200001cf = 0;
    *(uint8_t*)0x200001d0 = 0;
    *(uint8_t*)0x200001d1 = 0;
    *(uint8_t*)0x200001d2 = 0;
    *(uint8_t*)0x200001d3 = 0;
    *(uint8_t*)0x200001d4 = 0;
    *(uint8_t*)0x200001d5 = 0;
    *(uint8_t*)0x200001d6 = 0;
    *(uint8_t*)0x200001d7 = 1;
    *(uint32_t*)0x200001d8 = 2;
    syscall(__NR_bind, -1, 0x200001c0, 0x80);
    break;
  case 10:
    memcpy((void*)0x20000100, "./file0/file0", 14);
    syscall(__NR_open, 0x20000100, 0, 0);
    break;
  }
}

void execute_one()
{
  execute(11);
  collide = 1;
  execute(11);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}