// https://syzkaller.appspot.com/bug?id=7f2c87f4c360bcb8419c1cd55853d16cb89edbac
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/swap.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/falloc.h>
#include <linux/fs.h>
#include <linux/types.h>

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

static int runcmdline(char* cmdline)
{
  int ret = system(cmdline);
  if (ret) {
  }
  return ret;
}

#define SIZEOF_IO_URING_SQE 64
#define SIZEOF_IO_URING_CQE 16

#define IORING_SETUP_SQE128 (1U << 10)
#define IORING_SETUP_CQE32 (1U << 11)

struct io_sqring_offsets {
  uint32_t head;
  uint32_t tail;
  uint32_t ring_mask;
  uint32_t ring_entries;
  uint32_t flags;
  uint32_t dropped;
  uint32_t array;
  uint32_t resv1;
  uint64_t user_addr;
};

struct io_cqring_offsets {
  uint32_t head;
  uint32_t tail;
  uint32_t ring_mask;
  uint32_t ring_entries;
  uint32_t overflow;
  uint32_t cqes;
  uint32_t flags;
  uint32_t resv1;
  uint64_t user_addr;
};

struct io_uring_params {
  uint32_t sq_entries;
  uint32_t cq_entries;
  uint32_t flags;
  uint32_t sq_thread_cpu;
  uint32_t sq_thread_idle;
  uint32_t features;
  uint32_t resv[4];
  struct io_sqring_offsets sq_off;
  struct io_cqring_offsets cq_off;
};

static long io_uring_sqe_size(struct io_uring_params* params)
{
  return SIZEOF_IO_URING_SQE << !!(params->flags & IORING_SETUP_SQE128);
}

static long io_uring_cqe_size(struct io_uring_params* params)
{
  return SIZEOF_IO_URING_CQE << !!(params->flags & IORING_SETUP_CQE32);
}

#define IORING_OFF_SQ_RING 0ULL
#define IORING_OFF_SQES 0x10000000ULL
static long syz_io_uring_setup(volatile long a0, volatile long a1,
                               volatile long a2, volatile long a3,
                               volatile long a4)
{
  uint32_t entries = (uint32_t)a0;
  struct io_uring_params* setup_params = (struct io_uring_params*)a1;
  void** ring_params_ptr_out = (void**)a2;
  void** ring_ptr_out = (void**)a3;
  void** sqes_ptr_out = (void**)a4;
  uint32_t fd_io_uring = syscall(__NR_io_uring_setup, entries, setup_params);
  *ring_params_ptr_out = (void*)setup_params;
  uint32_t sq_ring_sz =
      setup_params->sq_off.array + setup_params->sq_entries * sizeof(uint32_t);
  uint32_t cq_ring_sz =
      setup_params->cq_off.cqes +
      setup_params->cq_entries * io_uring_cqe_size(setup_params);
  uint32_t ring_sz = sq_ring_sz > cq_ring_sz ? sq_ring_sz : cq_ring_sz;
  *ring_ptr_out =
      mmap(0, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE,
           fd_io_uring, IORING_OFF_SQ_RING);
  uint32_t sqes_sz = setup_params->sq_entries * io_uring_sqe_size(setup_params);
  *sqes_ptr_out = mmap(0, sqes_sz, PROT_READ | PROT_WRITE,
                       MAP_SHARED | MAP_POPULATE, fd_io_uring, IORING_OFF_SQES);
  uint32_t* array =
      (uint32_t*)((uintptr_t)*ring_ptr_out + setup_params->sq_off.array);
  for (uint32_t index = 0; index < setup_params->sq_entries; index++)
    array[index] = index;
  return fd_io_uring;
}

static long syz_io_uring_submit(volatile long a0, volatile long a1,
                                volatile long a2, volatile long a3)
{
  struct io_uring_params* params = (struct io_uring_params*)a0;
  char* ring_ptr = (char*)a1;
  char* sqes_ptr = (char*)a2;
  char* sqe = (char*)a3;
  uint32_t sq_ring_mask = *(uint32_t*)(ring_ptr + params->sq_off.ring_mask);
  uint32_t* sq_tail_ptr = (uint32_t*)(ring_ptr + params->sq_off.tail);
  uint32_t sq_tail = *sq_tail_ptr & sq_ring_mask;
  uint32_t sqe_size = io_uring_sqe_size(params);
  char* sqe_dest = sqes_ptr + sq_tail * sqe_size;
  memcpy(sqe_dest, sqe, sqe_size);
  uint32_t sq_tail_next = *sq_tail_ptr + 1;
  __atomic_store_n(sq_tail_ptr, sq_tail_next, __ATOMIC_RELEASE);
  return 0;
}

static long syz_ublk_setup_io_uring(volatile long a0, volatile long a1,
                                    volatile long a2, volatile long a3,
                                    volatile long a4)
{
  struct io_uring_params* params = (struct io_uring_params*)a1;
  params->flags |= IORING_SETUP_SQE128 | IORING_SETUP_CQE32;
  return syz_io_uring_setup(a0, (long)params, a2, a3, a4);
}

#define UBLK_F_USER_COPY (1UL << 7)

#define UBLK_IO_RES_OK 0
#define UBLK_IO_RES_NEED_GET_DATA 1

#define UBLK_IO_COMMIT_AND_FETCH_REQ 0x21
#define UBLK_IO_NEED_GET_DATA 0x22

#define UBLK_U_IO_COMMIT_AND_FETCH_REQ                                         \
  _IOWR('u', UBLK_IO_COMMIT_AND_FETCH_REQ, struct ublksrv_io_cmd)
#define UBLK_U_IO_NEED_GET_DATA                                                \
  _IOWR('u', UBLK_IO_NEED_GET_DATA, struct ublksrv_io_cmd)

struct ublksrv_ctrl_cmd {
  __u32 dev_id;
  __u16 queue_id;
  __u16 len;
  __u64 addr;
  __u64 data[1];
  __u16 dev_path_len;
  __u16 pad;
  __u32 reserved;
};

struct ublksrv_ctrl_dev_info {
  __u16 nr_hw_queues;
  __u16 queue_depth;
  __u16 state;
  __u16 pad0;
  __u32 max_io_buf_bytes;
  __u32 dev_id;
  __s32 ublksrv_pid;
  __u32 pad1;
  __u64 flags;
  __u64 ublksrv_flags;
  __u32 owner_uid;
  __u32 owner_gid;
  __u64 reserved1;
  __u64 reserved2;
};

struct ublksrv_io_desc {
  __u32 op_flags;
  union {
    __u32 nr_sectors;
    __u32 nr_zones;
  };
  __u64 start_sector;
  __u64 addr;
};

struct ublksrv_io_cmd {
  __u16 q_id;
  __u16 tag;
  __s32 result;
  union {
    __u64 addr;
    __u64 zone_append_lba;
  };
};

struct io_uring_sqe {
  __u8 opcode;
  __u8 flags;
  __u16 ioprio;
  __s32 fd;
  union {
    __u64 off;
    __u64 addr2;
    struct {
      __u32 cmd_op;
      __u32 __pad1;
    };
  };
  union {
    __u64 addr;
    __u64 splice_off_in;
    struct {
      __u32 level;
      __u32 optname;
    };
  };
  __u32 len;
  union {
    __kernel_rwf_t rw_flags;
    __u32 fsync_flags;
    __u16 poll_events;
    __u32 poll32_events;
    __u32 sync_range_flags;
    __u32 msg_flags;
    __u32 timeout_flags;
    __u32 accept_flags;
    __u32 cancel_flags;
    __u32 open_flags;
    __u32 statx_flags;
    __u32 fadvise_advice;
    __u32 splice_flags;
    __u32 rename_flags;
    __u32 unlink_flags;
    __u32 hardlink_flags;
    __u32 xattr_flags;
    __u32 msg_ring_flags;
    __u32 uring_cmd_flags;
    __u32 waitid_flags;
    __u32 futex_flags;
    __u32 install_fd_flags;
    __u32 nop_flags;
    __u32 pipe_flags;
  };
  __u64 user_data;
  union {
    __u16 buf_index;
    __u16 buf_group;
  } __attribute__((packed));
  __u16 personality;
  union {
    __s32 splice_fd_in;
    __u32 file_index;
    __u32 zcrx_ifq_idx;
    __u32 optlen;
    struct {
      __u16 addr_len;
      __u16 __pad3[1];
    };
  };
  union {
    struct {
      __u64 addr3;
      __u64 __pad2[1];
    };
    struct {
      __u64 attr_ptr;
      __u64 attr_type_mask;
    };
    __u64 optval;
    __u8 cmd[0];
  };
};

static long syz_ublk_add_dev(volatile long a0, volatile long a1,
                             volatile long a2, volatile long a3,
                             volatile long a4, volatile long a5)
{
  __u32 ring_fd = (__u32)a0;
  struct io_uring_params* params = (struct io_uring_params*)a1;
  char* ring_ptr = (char*)a2;
  char* sqes_ptr = (char*)a3;
  struct io_uring_sqe* sqe = (struct io_uring_sqe*)a4;
  void** dev_info_ptr_out = (void**)a5;
  struct ublksrv_ctrl_cmd* cmd = (struct ublksrv_ctrl_cmd*)(sqe->cmd);
  struct ublksrv_ctrl_dev_info* dev_info =
      (struct ublksrv_ctrl_dev_info*)(unsigned long)(cmd->addr);
  dev_info->flags |= UBLK_F_USER_COPY;
  int ret = syz_io_uring_submit((long)params, (long)ring_ptr, (long)sqes_ptr,
                                (long)sqe);
  if (ret < 0)
    return (long)ret;
  syscall(__NR_io_uring_enter, ring_fd, 1, 1, 1, NULL, _NSIG / 8);
  *dev_info_ptr_out = (void*)dev_info;
  return dev_info->dev_id;
}

struct ublk_queue {
  __u16 q_id;
  __u32 char_dev_fd;
  struct io_uring_params params;
  __u32 ring_fd;
  char* ring_ptr;
  char* sqes_ptr;
  char* io_cmd_buf;
};

#define UBLK_MAX_QUEUE_DEPTH 4096
#define UBLK_QUEUES_OFFSET 0

#define round_up(x, y) (((x) + (y) - 1) / (y) * (y))

static long syz_ublk_setup_queues(volatile long a0, volatile long a1,
                                  volatile long a2, volatile long a3,
                                  volatile long a4, volatile long a5,
                                  volatile long a6)
{
  int char_dev_fd = (int)a0;
  struct ublksrv_ctrl_dev_info* dev_info = (struct ublksrv_ctrl_dev_info*)a1;
  struct io_uring_params* params = (struct io_uring_params*)a2;
  struct ublk_queue* queues = (struct ublk_queue*)a3;
  int queues_len = (int)a4;
  struct io_uring_sqe* sqe = (struct io_uring_sqe*)a5;
  void** queues_ptr_out = (void**)a6;
  if (char_dev_fd < 0 || !dev_info)
    return -1;
  memset(queues, 0, sizeof(struct ublk_queue) * queues_len);
  int queue_depth = dev_info->queue_depth;
  for (int q_id = 0; q_id < dev_info->nr_hw_queues; q_id++) {
    struct ublk_queue* queue = &queues[q_id];
    queue->q_id = q_id;
    queue->char_dev_fd = char_dev_fd;
    queue->params = *params;
    struct io_uring_params* temp = NULL;
    queue->ring_fd = syz_ublk_setup_io_uring(
        (long)queue_depth, (long)&queue->params, (long)&temp,
        (long)&queue->ring_ptr, (long)&queue->sqes_ptr);
    if (queue->ring_fd < 0) {
      return queue->ring_fd;
    }
    unsigned long cmd_buf_size =
        round_up(queue_depth * sizeof(struct ublksrv_io_desc), getpagesize());
    unsigned long off =
        UBLK_QUEUES_OFFSET +
        q_id * round_up(UBLK_MAX_QUEUE_DEPTH * sizeof(struct ublksrv_io_desc),
                        getpagesize());
    queue->io_cmd_buf =
        (char*)mmap(0, cmd_buf_size, PROT_READ, MAP_SHARED | MAP_POPULATE,
                    char_dev_fd, off);
    if (queue->io_cmd_buf == MAP_FAILED) {
      return -1;
    }
    for (int j = 0; j < queue_depth; j++) {
      struct ublksrv_io_cmd* cmd = (struct ublksrv_io_cmd*)(&sqe->cmd);
      cmd->q_id = q_id;
      cmd->tag = j;
      cmd->addr = 0;
      sqe->user_data = j | (sqe->cmd_op << 16);
      if (syz_io_uring_submit((long)&queue->params, (long)queue->ring_ptr,
                              (long)queue->sqes_ptr, (long)sqe) < 0) {
        return -1;
      }
      syscall(__NR_io_uring_enter, queue->ring_fd, 1, 0, 0, NULL, _NSIG / 8);
    }
  }
  *queues_ptr_out = (void*)queues;
  return 0;
}

#define MAX_FDS 30

static long syz_open_dev(volatile long a0, volatile long a1, volatile long 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 {
    unsigned long nb = a1;
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(nb % 10);
      nb /= 10;
    }
    return open(buf, a2 & ~O_CREAT, 0);
  }
}

static void setup_gadgetfs();
static void setup_binderfs();
static void setup_fusectl();
static void sandbox_common_mount_tmpfs(void)
{
  write_file("/proc/sys/fs/mount-max", "100000");
  if (mkdir("./syz-tmp", 0777))
    exit(1);
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot", 0777))
    exit(1);
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    exit(1);
  unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    exit(1);
  if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    exit(1);
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) {
    if (errno != ENOENT)
      exit(1);
    if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) &&
        errno != ENOENT)
      exit(1);
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    exit(1);
  if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL))
    exit(1);
  if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/proc/sys/fs/binfmt_misc",
            "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags,
            NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/newroot/syz-inputs", 0700))
    exit(1);
  if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL,
            bind_mount_flags | MS_RDONLY, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/pivot", 0777))
    exit(1);
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      exit(1);
  } else {
    if (chdir("/"))
      exit(1);
    if (umount2("./pivot", MNT_DETACH))
      exit(1);
  }
  if (chroot("./newroot"))
    exit(1);
  if (chdir("/"))
    exit(1);
  setup_gadgetfs();
  setup_binderfs();
  setup_fusectl();
}

static void setup_gadgetfs()
{
  if (mkdir("/dev/gadgetfs", 0777)) {
  }
  if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) {
  }
}

static void setup_fusectl()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, "stats=global")) {
    if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
    }
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  if (getppid() == 1)
    exit(1);
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  sandbox_common_mount_tmpfs();
  loop();
  exit(1);
}

static void close_fds()
{
  for (int fd = 3; fd < MAX_FDS; fd++)
    close(fd);
}

static const char* setup_binfmt_misc()
{
  if (mount(0, "/proc/sys/fs/binfmt_misc", "binfmt_misc", 0, 0) &&
      errno != EBUSY) {
    return NULL;
  }
  if (!write_file("/proc/sys/fs/binfmt_misc/register",
                  ":syz0:M:0:\x01::./file0:") ||
      !write_file("/proc/sys/fs/binfmt_misc/register",
                  ":syz1:M:1:\x02::/proc/thread-self/cwd/file0:POC"))
    return "write(/proc/sys/fs/binfmt_misc/register) failed";
  return NULL;
}

static void setup_sysctl()
{
  int cad_pid = fork();
  if (cad_pid < 0)
    exit(1);
  if (cad_pid == 0) {
    for (;;)
      sleep(100);
  }
  char tmppid[32];
  snprintf(tmppid, sizeof(tmppid), "%d", cad_pid);
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/sys/kernel/debug/failslab/task-filter", "Y"},
      {"/sys/kernel/debug/fail_page_alloc/task-filter", "Y"},
      {"/sys/kernel/debug/fail_futex/task-filter", "Y"},
      {"/sys/kernel/debug/fail_usercopy/task-filter", "Y"},
      {"/sys/kernel/debug/fail_make_request/task-filter", "Y"},
      {"/sys/kernel/debug/fail_io_timeout/task-filter", "Y"},
      {"/sys/kernel/debug/fail_iommufd/task-filter", "Y"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", tmppid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data)) {
    }
  }
  kill(cad_pid, SIGKILL);
  while (waitpid(cad_pid, NULL, 0) != cad_pid)
    ;
}

#define SWAP_FILE "./swap-file"
#define SWAP_FILE_SIZE (128 * 1000 * 1000)

static const char* setup_swap()
{
  swapoff(SWAP_FILE);
  unlink(SWAP_FILE);
  int fd = open(SWAP_FILE, O_CREAT | O_WRONLY | O_CLOEXEC, 0600);
  if (fd == -1)
    return "swap file open failed";
  fallocate(fd, FALLOC_FL_ZERO_RANGE, 0, SWAP_FILE_SIZE);
  close(fd);
  char cmdline[64];
  sprintf(cmdline, "mkswap %s", SWAP_FILE);
  if (runcmdline(cmdline))
    return "mkswap failed";
  if (swapon(SWAP_FILE, SWAP_FLAG_PREFER) == 1)
    return "swapon failed";
  return NULL;
}

uint64_t r[9] = {
    0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
    0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$ublk_ctrl arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 75 62 6c 6b 2d 63 6f 6e 74 72 6f 6c 00}
  //      (length 0x12)
  //    }
  //    flags: const = 0x2 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_ublk_ctrl
  NONFAILING(memcpy((void*)0x200000000000, "/dev/ublk-control\000", 18));
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x200000000000ul, /*flags=*/2, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  syz_ublk_setup_io_uring arguments: [
  //    entries: int32 = 0x20 (4 bytes)
  //    params: ptr[inout, io_uring_params] {
  //      io_uring_params {
  //        sq_entries: int32 = 0x0 (4 bytes)
  //        cq_entries: int32 = 0x0 (4 bytes)
  //        flags: io_uring_setup_flags = 0x0 (4 bytes)
  //        sq_thread_cpu: int32 = 0x0 (4 bytes)
  //        sq_thread_idle: int32 = 0x0 (4 bytes)
  //        features: int32 = 0x0 (4 bytes)
  //        wq_fd: fd_io_uring (resource)
  //        resv: buffer: {00 00 00 00 00 00 00 00 00 00 00 00} (length 0xc)
  //        sq_off: io_sqring_offsets {
  //          head: int32 = 0x0 (4 bytes)
  //          tail: int32 = 0x0 (4 bytes)
  //          ring_mask: int32 = 0x0 (4 bytes)
  //          ring_entries: int32 = 0x0 (4 bytes)
  //          flags: int32 = 0x0 (4 bytes)
  //          dropped: int32 = 0x0 (4 bytes)
  //          array: int32 = 0x0 (4 bytes)
  //          resv1: int32 = 0x0 (4 bytes)
  //          user_addr: int64 = 0x0 (8 bytes)
  //        }
  //        cq_off: io_cqring_offsets {
  //          head: int32 = 0x0 (4 bytes)
  //          tail: int32 = 0x0 (4 bytes)
  //          ring_mask: int32 = 0x0 (4 bytes)
  //          ring_entries: int32 = 0x0 (4 bytes)
  //          overflow: int32 = 0x0 (4 bytes)
  //          cqes: int32 = 0x0 (4 bytes)
  //          flags: int32 = 0x0 (4 bytes)
  //          resv1: int32 = 0x0 (4 bytes)
  //          user_addr: int64 = 0x0 (8 bytes)
  //        }
  //      }
  //    }
  //    ring_params_ptr: ptr[out, ring_params_ptr] {
  //      ring_params_ptr (resource)
  //    }
  //    ring_ptr: ptr[out, ring_ptr] {
  //      ring_ptr (resource)
  //    }
  //    sqes_ptr: ptr[out, sqes_ptr] {
  //      sqes_ptr (resource)
  //    }
  //  ]
  //  returns fd_io_uring
  NONFAILING(*(uint32_t*)0x200000000184 = 0);
  NONFAILING(*(uint32_t*)0x200000000188 = 0);
  NONFAILING(*(uint32_t*)0x20000000018c = 0);
  NONFAILING(*(uint32_t*)0x200000000190 = 0);
  NONFAILING(*(uint32_t*)0x200000000198 = -1);
  NONFAILING(memset((void*)0x20000000019c, 0, 12));
  res = -1;
  NONFAILING(res = syz_ublk_setup_io_uring(
                 /*entries=*/0x20, /*params=*/0x200000000180,
                 /*ring_params_ptr=*/0x2000000000c0,
                 /*ring_ptr=*/0x200000000100, /*sqes_ptr=*/0x200000000140));
  if (res != -1) {
    r[1] = res;
    NONFAILING(r[2] = *(uint64_t*)0x2000000000c0);
    NONFAILING(r[3] = *(uint64_t*)0x200000000100);
    NONFAILING(r[4] = *(uint64_t*)0x200000000140);
  }
  //  syz_ublk_add_dev arguments: [
  //    fd_io_uring: fd_io_uring (resource)
  //    ring_params_ptr: ring_params_ptr (resource)
  //    ring_ptr: ring_ptr (resource)
  //    sqes_ptr: sqes_ptr (resource)
  //    sqe: ptr[inout, io_uring_sqe_uring[fd_ublk_ctrl,
  //    const[UBLK_U_CMD_ADD_DEV, int32], ublk_ctrl_cmd$add_dev, int64]] {
  //      io_uring_sqe_uring[fd_ublk_ctrl, const[UBLK_U_CMD_ADD_DEV, int32],
  //      ublk_ctrl_cmd$add_dev, int64] {
  //        opcode: const = 0x2e (1 bytes)
  //        flags: iosqe_flags = 0xc (1 bytes)
  //        ioprio: const = 0x0 (2 bytes)
  //        fd: fd_ublk_ctrl (resource)
  //        cmd_op: const = 0xc0207504 (4 bytes)
  //        pad1: const = 0x0 (4 bytes)
  //        addr: const = 0x0 (8 bytes)
  //        len: const = 0x0 (4 bytes)
  //        uring_flags: uring_cmd_flags = 0x0 (4 bytes)
  //        user_data: int64 = 0x0 (8 bytes)
  //        buf_index_unused: const = 0x0 (2 bytes)
  //        ioring_personality_id: ioring_personality_id (resource)
  //        pad_unused: buffer: {00 00 00 00} (length 0x4)
  //        cmd: ublk_ctrl_cmd[const[-1, int32], len[addr, int16], ptr64[in,
  //        ublk_ctrl_dev_info_new], const[0, int64]] {
  //          dev_id: const = 0xffffffff (4 bytes)
  //          queue_id: const = 0xffff (2 bytes)
  //          len: len = 0x40 (2 bytes)
  //          addr: ptr[in, ublk_ctrl_dev_info_new] {
  //            union ublk_ctrl_dev_info_new {
  //              new_dev: ublk_ctrl_dev_info[const[-1, int32]] {
  //                nr_hw_queues: int16 = 0x3 (2 bytes)
  //                queue_depth: int16 = 0x104 (2 bytes)
  //                state: const = 0x0 (2 bytes)
  //                pad0: const = 0x0 (2 bytes)
  //                max_io_buf_bytes: const = 0x1000 (4 bytes)
  //                dev_id: const = 0xffffffff (4 bytes)
  //                ublk_pid: pid (resource)
  //                pad1: const = 0x0 (4 bytes)
  //                flags: ublk_f_flags = 0x0 (8 bytes)
  //                ublk_flags: const = 0x0 (8 bytes)
  //                owner_uid: const = 0x0 (4 bytes)
  //                owner_gid: const = 0x0 (4 bytes)
  //                reserved1: const = 0x0 (8 bytes)
  //                reserved2: const = 0x0 (8 bytes)
  //              }
  //            }
  //          }
  //          data: const = 0x0 (8 bytes)
  //          dev_path_len: const = 0x0 (2 bytes)
  //          pad: const = 0x0 (2 bytes)
  //          reserved: const = 0x0 (4 bytes)
  //          pad2_unused: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00 00 00 00 00 00 00 00 00} (length 0x30)
  //        }
  //      }
  //    }
  //    dev_info_ptr: ptr[out, dev_info_ptr] {
  //      dev_info_ptr (resource)
  //    }
  //  ]
  //  returns ublk_dev_id
  NONFAILING(*(uint8_t*)0x200000000200 = 0x2e);
  NONFAILING(*(uint8_t*)0x200000000201 = 0xc);
  NONFAILING(*(uint16_t*)0x200000000202 = 0);
  NONFAILING(*(uint32_t*)0x200000000204 = r[0]);
  NONFAILING(*(uint32_t*)0x200000000208 = 0xc0207504);
  NONFAILING(*(uint32_t*)0x20000000020c = 0);
  NONFAILING(*(uint64_t*)0x200000000210 = 0);
  NONFAILING(*(uint32_t*)0x200000000218 = 0);
  NONFAILING(*(uint32_t*)0x20000000021c = 0);
  NONFAILING(*(uint64_t*)0x200000000220 = 0);
  NONFAILING(*(uint16_t*)0x200000000228 = 0);
  NONFAILING(*(uint16_t*)0x20000000022a = 0);
  NONFAILING(memset((void*)0x20000000022c, 0, 4));
  NONFAILING(*(uint32_t*)0x200000000230 = -1);
  NONFAILING(*(uint16_t*)0x200000000234 = -1);
  NONFAILING(*(uint16_t*)0x200000000236 = 0x40);
  NONFAILING(*(uint64_t*)0x200000000238 = 0x200000000500);
  NONFAILING(*(uint16_t*)0x200000000500 = 3);
  NONFAILING(*(uint16_t*)0x200000000502 = 0x104);
  NONFAILING(*(uint16_t*)0x200000000504 = 0);
  NONFAILING(*(uint16_t*)0x200000000506 = 0);
  NONFAILING(*(uint32_t*)0x200000000508 = 0x1000);
  NONFAILING(*(uint32_t*)0x20000000050c = -1);
  NONFAILING(*(uint32_t*)0x200000000510 = 0);
  NONFAILING(*(uint32_t*)0x200000000514 = 0);
  NONFAILING(*(uint64_t*)0x200000000518 = 0);
  NONFAILING(*(uint64_t*)0x200000000520 = 0);
  NONFAILING(*(uint32_t*)0x200000000528 = 0);
  NONFAILING(*(uint32_t*)0x20000000052c = 0);
  NONFAILING(*(uint64_t*)0x200000000530 = 0);
  NONFAILING(*(uint64_t*)0x200000000538 = 0);
  NONFAILING(*(uint64_t*)0x200000000240 = 0);
  NONFAILING(*(uint16_t*)0x200000000248 = 0);
  NONFAILING(*(uint16_t*)0x20000000024a = 0);
  NONFAILING(*(uint32_t*)0x20000000024c = 0);
  NONFAILING(memset((void*)0x200000000250, 0, 48));
  res = -1;
  NONFAILING(res = syz_ublk_add_dev(/*fd_io_uring=*/r[1],
                                    /*ring_params_ptr=*/r[2], /*ring_ptr=*/r[3],
                                    /*sqes_ptr=*/r[4], /*sqe=*/0x200000000200,
                                    /*dev_info_ptr=*/0x200000000300));
  if (res != -1) {
    r[5] = res;
    NONFAILING(r[6] = *(uint16_t*)0x20000000022a);
    NONFAILING(r[7] = *(uint64_t*)0x200000000300);
  }
  //  syz_open_dev$ublk_chdev arguments: [
  //    dev: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 75 62 6c 6b 63 23 00} (length 0xc)
  //    }
  //    id: ublk_dev_id (resource)
  //    flags: open_flags = 0x2 (8 bytes)
  //  ]
  //  returns fd_ublk_ch
  NONFAILING(memcpy((void*)0x200000002000, "/dev/ublkc#\000", 12));
  res = -1;
  NONFAILING(res = syz_open_dev(/*dev=*/0x200000002000, /*id=*/r[5],
                                /*flags=O_RDWR*/ 2));
  if (res != -1)
    r[8] = res;
  //  syz_ublk_setup_queues arguments: [
  //    fd_ublk_ch: fd_ublk_ch (resource)
  //    dev_info_ptr: dev_info_ptr (resource)
  //    params: ptr[in, io_uring_params] {
  //      io_uring_params {
  //        sq_entries: int32 = 0x0 (4 bytes)
  //        cq_entries: int32 = 0x7193 (4 bytes)
  //        flags: io_uring_setup_flags = 0x400 (4 bytes)
  //        sq_thread_cpu: int32 = 0x2 (4 bytes)
  //        sq_thread_idle: int32 = 0x219 (4 bytes)
  //        features: int32 = 0x0 (4 bytes)
  //        wq_fd: fd_io_uring (resource)
  //        resv: buffer: {00 00 00 00 00 00 00 00 00 00 00 00} (length 0xc)
  //        sq_off: io_sqring_offsets {
  //          head: int32 = 0x0 (4 bytes)
  //          tail: int32 = 0x0 (4 bytes)
  //          ring_mask: int32 = 0x0 (4 bytes)
  //          ring_entries: int32 = 0x0 (4 bytes)
  //          flags: int32 = 0x0 (4 bytes)
  //          dropped: int32 = 0x0 (4 bytes)
  //          array: int32 = 0x0 (4 bytes)
  //          resv1: int32 = 0x0 (4 bytes)
  //          user_addr: int64 = 0x0 (8 bytes)
  //        }
  //        cq_off: io_cqring_offsets {
  //          head: int32 = 0x0 (4 bytes)
  //          tail: int32 = 0x0 (4 bytes)
  //          ring_mask: int32 = 0x0 (4 bytes)
  //          ring_entries: int32 = 0x0 (4 bytes)
  //          overflow: int32 = 0x0 (4 bytes)
  //          cqes: int32 = 0x0 (4 bytes)
  //          flags: int32 = 0x0 (4 bytes)
  //          resv1: int32 = 0x0 (4 bytes)
  //          user_addr: int64 = 0x0 (8 bytes)
  //        }
  //      }
  //    }
  //    queues: ptr[out, array[ublk_queue]] {
  //      array[ublk_queue] {
  //        ublk_queue {
  //          queue_id: int16 = 0x0 (2 bytes)
  //          pad1: const = 0x0 (2 bytes)
  //          fd_ublk_ch: fd_ublk_ch (resource)
  //          params: io_uring_params {
  //            sq_entries: int32 = 0x0 (4 bytes)
  //            cq_entries: int32 = 0x72bc (4 bytes)
  //            flags: io_uring_setup_flags = 0x40 (4 bytes)
  //            sq_thread_cpu: int32 = 0x4000002 (4 bytes)
  //            sq_thread_idle: int32 = 0x30c (4 bytes)
  //            features: int32 = 0x0 (4 bytes)
  //            wq_fd: fd_io_uring (resource)
  //            resv: buffer: (DirOut)
  //            sq_off: io_sqring_offsets {
  //              head: int32 = 0x0 (4 bytes)
  //              tail: int32 = 0x0 (4 bytes)
  //              ring_mask: int32 = 0x0 (4 bytes)
  //              ring_entries: int32 = 0x0 (4 bytes)
  //              flags: int32 = 0x0 (4 bytes)
  //              dropped: int32 = 0x0 (4 bytes)
  //              array: int32 = 0x0 (4 bytes)
  //              resv1: int32 = 0x0 (4 bytes)
  //              user_addr: int64 = 0x0 (8 bytes)
  //            }
  //            cq_off: io_cqring_offsets {
  //              head: int32 = 0x0 (4 bytes)
  //              tail: int32 = 0x0 (4 bytes)
  //              ring_mask: int32 = 0x0 (4 bytes)
  //              ring_entries: int32 = 0x0 (4 bytes)
  //              overflow: int32 = 0x0 (4 bytes)
  //              cqes: int32 = 0x0 (4 bytes)
  //              flags: int32 = 0x0 (4 bytes)
  //              resv1: int32 = 0x0 (4 bytes)
  //              user_addr: int64 = 0x0 (8 bytes)
  //            }
  //          }
  //          ring_fd: fd_io_uring (resource)
  //          pad2: const = 0x0 (4 bytes)
  //          ring_ptr: ring_ptr (resource)
  //          sqes_ptr: sqes_ptr (resource)
  //          io_cmd_buf: intptr = 0x0 (8 bytes)
  //        }
  //        ublk_queue {
  //          queue_id: int16 = 0x0 (2 bytes)
  //          pad1: const = 0x0 (2 bytes)
  //          fd_ublk_ch: fd_ublk_ch (resource)
  //          params: io_uring_params {
  //            sq_entries: int32 = 0x0 (4 bytes)
  //            cq_entries: int32 = 0x1887 (4 bytes)
  //            flags: io_uring_setup_flags = 0x40 (4 bytes)
  //            sq_thread_cpu: int32 = 0x10003 (4 bytes)
  //            sq_thread_idle: int32 = 0x393 (4 bytes)
  //            features: int32 = 0x0 (4 bytes)
  //            wq_fd: fd_io_uring (resource)
  //            resv: buffer: (DirOut)
  //            sq_off: io_sqring_offsets {
  //              head: int32 = 0x0 (4 bytes)
  //              tail: int32 = 0x0 (4 bytes)
  //              ring_mask: int32 = 0x0 (4 bytes)
  //              ring_entries: int32 = 0x0 (4 bytes)
  //              flags: int32 = 0x0 (4 bytes)
  //              dropped: int32 = 0x0 (4 bytes)
  //              array: int32 = 0x0 (4 bytes)
  //              resv1: int32 = 0x0 (4 bytes)
  //              user_addr: int64 = 0x0 (8 bytes)
  //            }
  //            cq_off: io_cqring_offsets {
  //              head: int32 = 0x0 (4 bytes)
  //              tail: int32 = 0x0 (4 bytes)
  //              ring_mask: int32 = 0x0 (4 bytes)
  //              ring_entries: int32 = 0x0 (4 bytes)
  //              overflow: int32 = 0x0 (4 bytes)
  //              cqes: int32 = 0x0 (4 bytes)
  //              flags: int32 = 0x0 (4 bytes)
  //              resv1: int32 = 0x0 (4 bytes)
  //              user_addr: int64 = 0x0 (8 bytes)
  //            }
  //          }
  //          ring_fd: fd_io_uring (resource)
  //          pad2: const = 0x0 (4 bytes)
  //          ring_ptr: ring_ptr (resource)
  //          sqes_ptr: sqes_ptr (resource)
  //          io_cmd_buf: intptr = 0x0 (8 bytes)
  //        }
  //        ublk_queue {
  //          queue_id: int16 = 0x0 (2 bytes)
  //          pad1: const = 0x0 (2 bytes)
  //          fd_ublk_ch: fd_ublk_ch (resource)
  //          params: io_uring_params {
  //            sq_entries: int32 = 0x0 (4 bytes)
  //            cq_entries: int32 = 0x468b (4 bytes)
  //            flags: io_uring_setup_flags = 0x8 (4 bytes)
  //            sq_thread_cpu: int32 = 0x1 (4 bytes)
  //            sq_thread_idle: int32 = 0xc5 (4 bytes)
  //            features: int32 = 0x0 (4 bytes)
  //            wq_fd: fd_io_uring (resource)
  //            resv: buffer: (DirOut)
  //            sq_off: io_sqring_offsets {
  //              head: int32 = 0x0 (4 bytes)
  //              tail: int32 = 0x0 (4 bytes)
  //              ring_mask: int32 = 0x0 (4 bytes)
  //              ring_entries: int32 = 0x0 (4 bytes)
  //              flags: int32 = 0x0 (4 bytes)
  //              dropped: int32 = 0x0 (4 bytes)
  //              array: int32 = 0x0 (4 bytes)
  //              resv1: int32 = 0x0 (4 bytes)
  //              user_addr: int64 = 0x0 (8 bytes)
  //            }
  //            cq_off: io_cqring_offsets {
  //              head: int32 = 0x0 (4 bytes)
  //              tail: int32 = 0x0 (4 bytes)
  //              ring_mask: int32 = 0x0 (4 bytes)
  //              ring_entries: int32 = 0x0 (4 bytes)
  //              overflow: int32 = 0x0 (4 bytes)
  //              cqes: int32 = 0x0 (4 bytes)
  //              flags: int32 = 0x0 (4 bytes)
  //              resv1: int32 = 0x0 (4 bytes)
  //              user_addr: int64 = 0x0 (8 bytes)
  //            }
  //          }
  //          ring_fd: fd_io_uring (resource)
  //          pad2: const = 0x0 (4 bytes)
  //          ring_ptr: ring_ptr (resource)
  //          sqes_ptr: sqes_ptr (resource)
  //          io_cmd_buf: intptr = 0x0 (8 bytes)
  //        }
  //        ublk_queue {
  //          queue_id: int16 = 0x0 (2 bytes)
  //          pad1: const = 0x0 (2 bytes)
  //          fd_ublk_ch: fd_ublk_ch (resource)
  //          params: io_uring_params {
  //            sq_entries: int32 = 0x0 (4 bytes)
  //            cq_entries: int32 = 0xc7a (4 bytes)
  //            flags: io_uring_setup_flags = 0x44 (4 bytes)
  //            sq_thread_cpu: int32 = 0x0 (4 bytes)
  //            sq_thread_idle: int32 = 0x20a (4 bytes)
  //            features: int32 = 0x0 (4 bytes)
  //            wq_fd: fd_io_uring (resource)
  //            resv: buffer: (DirOut)
  //            sq_off: io_sqring_offsets {
  //              head: int32 = 0x0 (4 bytes)
  //              tail: int32 = 0x0 (4 bytes)
  //              ring_mask: int32 = 0x0 (4 bytes)
  //              ring_entries: int32 = 0x0 (4 bytes)
  //              flags: int32 = 0x0 (4 bytes)
  //              dropped: int32 = 0x0 (4 bytes)
  //              array: int32 = 0x0 (4 bytes)
  //              resv1: int32 = 0x0 (4 bytes)
  //              user_addr: int64 = 0x0 (8 bytes)
  //            }
  //            cq_off: io_cqring_offsets {
  //              head: int32 = 0x0 (4 bytes)
  //              tail: int32 = 0x0 (4 bytes)
  //              ring_mask: int32 = 0x0 (4 bytes)
  //              ring_entries: int32 = 0x0 (4 bytes)
  //              overflow: int32 = 0x0 (4 bytes)
  //              cqes: int32 = 0x0 (4 bytes)
  //              flags: int32 = 0x0 (4 bytes)
  //              resv1: int32 = 0x0 (4 bytes)
  //              user_addr: int64 = 0x0 (8 bytes)
  //            }
  //          }
  //          ring_fd: fd_io_uring (resource)
  //          pad2: const = 0x0 (4 bytes)
  //          ring_ptr: ring_ptr (resource)
  //          sqes_ptr: sqes_ptr (resource)
  //          io_cmd_buf: intptr = 0x0 (8 bytes)
  //        }
  //      }
  //    }
  //    nr_queues: const = 0x4 (8 bytes)
  //    sqe: ptr[inout, io_uring_sqe_uring[fd_ublk_ch,
  //    const[UBLK_U_IO_FETCH_REQ, int32], ublk_io_cmd$fetch_req,
  //    user_data[UBLK_U_IO_FETCH_REQ]]] {
  //      io_uring_sqe_uring[fd_ublk_ch, const[UBLK_U_IO_FETCH_REQ, int32],
  //      ublk_io_cmd$fetch_req, user_data[UBLK_U_IO_FETCH_REQ]] {
  //        opcode: const = 0x2e (1 bytes)
  //        flags: iosqe_flags = 0x50 (1 bytes)
  //        ioprio: const = 0x0 (2 bytes)
  //        fd: fd_ublk_ch (resource)
  //        cmd_op: const = 0xc0107520 (4 bytes)
  //        pad1: const = 0x0 (4 bytes)
  //        addr: const = 0x0 (8 bytes)
  //        len: const = 0x0 (4 bytes)
  //        uring_flags: uring_cmd_flags = 0x0 (4 bytes)
  //        user_data: user_data[UBLK_U_IO_FETCH_REQ] {
  //          tag: int64 = 0xff (0 bytes)
  //          cmd: const = 0xc0107520 (0 bytes)
  //          pad: const = 0x0 (8 bytes)
  //        }
  //        buf_index_unused: const = 0x0 (2 bytes)
  //        ioring_personality_id: ioring_personality_id (resource)
  //        pad_unused: buffer: {00 00 00 00} (length 0x4)
  //        cmd: ublk_io_cmd[int16[0:UBLK_MAX_HW_QUEUES],
  //        int16[0:UBLK_MAX_QUEUE_DEPTH], const[0, int32], ptr64[inout,
  //        ublk_io_buf_u]] {
  //          q_id: int16 = 0x4 (2 bytes)
  //          tag: int16 = 0xe52 (2 bytes)
  //          result: const = 0x0 (4 bytes)
  //          addr: nil
  //          pad: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00} (length 0x40)
  //        }
  //      }
  //    }
  //    ublk_queues_ptr: nil
  //  ]
  NONFAILING(*(uint32_t*)0x200000000344 = 0x7193);
  NONFAILING(*(uint32_t*)0x200000000348 = 0x400);
  NONFAILING(*(uint32_t*)0x20000000034c = 2);
  NONFAILING(*(uint32_t*)0x200000000350 = 0x219);
  NONFAILING(*(uint32_t*)0x200000000358 = -1);
  NONFAILING(memset((void*)0x20000000035c, 0, 12));
  NONFAILING(*(uint32_t*)0x2000000005cc = 0x72bc);
  NONFAILING(*(uint32_t*)0x2000000005d0 = 0x40);
  NONFAILING(*(uint32_t*)0x2000000005d4 = 0x4000002);
  NONFAILING(*(uint32_t*)0x2000000005d8 = 0x30c);
  NONFAILING(*(uint32_t*)0x2000000005e0 = r[1]);
  NONFAILING(*(uint32_t*)0x20000000066c = 0x1887);
  NONFAILING(*(uint32_t*)0x200000000670 = 0x40);
  NONFAILING(*(uint32_t*)0x200000000674 = 0x10003);
  NONFAILING(*(uint32_t*)0x200000000678 = 0x393);
  NONFAILING(*(uint32_t*)0x200000000680 = -1);
  NONFAILING(*(uint32_t*)0x20000000070c = 0x468b);
  NONFAILING(*(uint32_t*)0x200000000710 = 8);
  NONFAILING(*(uint32_t*)0x200000000714 = 1);
  NONFAILING(*(uint32_t*)0x200000000718 = 0xc5);
  NONFAILING(*(uint32_t*)0x200000000720 = r[1]);
  NONFAILING(*(uint32_t*)0x2000000007ac = 0xc7a);
  NONFAILING(*(uint32_t*)0x2000000007b0 = 0x44);
  NONFAILING(*(uint32_t*)0x2000000007b4 = 0);
  NONFAILING(*(uint32_t*)0x2000000007b8 = 0x20a);
  NONFAILING(*(uint32_t*)0x2000000007c0 = r[1]);
  NONFAILING(*(uint8_t*)0x200000001dc0 = 0x2e);
  NONFAILING(*(uint8_t*)0x200000001dc1 = 0x50);
  NONFAILING(*(uint16_t*)0x200000001dc2 = 0);
  NONFAILING(*(uint32_t*)0x200000001dc4 = r[8]);
  NONFAILING(*(uint32_t*)0x200000001dc8 = 0xc0107520);
  NONFAILING(*(uint32_t*)0x200000001dcc = 0);
  NONFAILING(*(uint64_t*)0x200000001dd0 = 0);
  NONFAILING(*(uint32_t*)0x200000001dd8 = 0);
  NONFAILING(*(uint32_t*)0x200000001ddc = 0);
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x200000001de0, 0xff, 0, 16));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x200000001de0, 0xc0107520, 16, 32));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x200000001de0, 0, 48, 16));
  NONFAILING(*(uint16_t*)0x200000001de8 = 0);
  NONFAILING(*(uint16_t*)0x200000001dea = r[6]);
  NONFAILING(memset((void*)0x200000001dec, 0, 4));
  NONFAILING(*(uint16_t*)0x200000001df0 = 4);
  NONFAILING(*(uint16_t*)0x200000001df2 = 0xe52);
  NONFAILING(*(uint32_t*)0x200000001df4 = 0);
  NONFAILING(*(uint64_t*)0x200000001df8 = 0);
  NONFAILING(memset((void*)0x200000001e00, 0, 64));
  NONFAILING(syz_ublk_setup_queues(
      /*fd_ublk_ch=*/r[8], /*dev_info_ptr=*/r[7], /*params=*/0x200000000340,
      /*queues=*/0x2000000005c0, /*nr_queues=*/4, /*sqe=*/0x200000001dc0,
      /*ublk_queues_ptr=*/0));
  close_fds();
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  setup_sysctl();
  const char* reason;
  (void)reason;
  if ((reason = setup_binfmt_misc()))
    printf("the reproducer may not work as expected: binfmt_misc setup failed: "
           "%s\n",
           reason);
  if ((reason = setup_swap()))
    printf("the reproducer may not work as expected: swap setup failed: %s\n",
           reason);
  install_segv_handler();
  use_temporary_dir();
  do_sandbox_none();
  return 0;
}