// https://syzkaller.appspot.com/bug?id=8c0173f9126eb1d9499cba81e26aa7cf87d9b64f
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.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/mount.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/fs.h>
#include <linux/futex.h>
#include <linux/types.h>

#ifndef __NR_bpf
#define __NR_bpf 357
#endif
#ifndef __NR_connect
#define __NR_connect 362
#endif
#ifndef __NR_dup
#define __NR_dup 41
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_openat
#define __NR_openat 295
#endif
#ifndef __NR_recvmmsg
#define __NR_recvmmsg 337
#endif
#ifndef __NR_sendmmsg
#define __NR_sendmmsg 345
#endif
#ifndef __NR_sendmsg
#define __NR_sendmsg 370
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#ifndef __NR_socketpair
#define __NR_socketpair 360
#endif
#ifndef __NR_write
#define __NR_write 4
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

static unsigned long long procid;

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 sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  int state;
} event_t;

static void event_init(event_t* ev)
{
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

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;
}

#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 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;
}

#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;
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 15; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  socket$kcm arguments: [
    //    domain: const = 0xa (4 bytes)
    //    type: kcm_socket_type = 0x1 (4 bytes)
    //    proto: const = 0x0 (4 bytes)
    //  ]
    //  returns sock_kcm
    syscall(__NR_socket, /*domain=*/0xa, /*type=*/1, /*proto=*/0);
    break;
  case 1:
    //  socketpair$unix arguments: [
    //    domain: const = 0x1 (4 bytes)
    //    type: unix_socket_type = 0x3 (4 bytes)
    //    proto: const = 0x0 (4 bytes)
    //    fds: ptr[out, unix_pair] {
    //      unix_pair {
    //        fd0: sock_unix (resource)
    //        fd1: sock_unix (resource)
    //      }
    //    }
    //  ]
    res = syscall(__NR_socketpair, /*domain=*/1,
                  /*type=SOCK_DGRAM|SOCK_STREAM*/ 3, /*proto=*/0,
                  /*fds=*/0x80000080);
    if (res != -1) {
      NONFAILING(r[0] = *(uint32_t*)0x80000080);
      NONFAILING(r[1] = *(uint32_t*)0x80000084);
    }
    break;
  case 2:
    //  connect$unix arguments: [
    //    fd: sock_unix (resource)
    //    addr: ptr[in, sockaddr_un] {
    //      union sockaddr_un {
    //        abs: sockaddr_un_abstract {
    //          family: unix_socket_family = 0x0 (2 bytes)
    //          ind: const = 0x0 (1 bytes)
    //          pad = 0x0 (1 bytes)
    //          id: int32 = 0x0 (4 bytes)
    //        }
    //      }
    //    }
    //    addrlen: len = 0x6e (4 bytes)
    //  ]
    NONFAILING(*(uint16_t*)0x8057eff8 = 0);
    NONFAILING(*(uint8_t*)0x8057effa = 0);
    NONFAILING(*(uint32_t*)0x8057effc = 0);
    syscall(__NR_connect, /*fd=*/(intptr_t)r[0], /*addr=*/0x8057eff8,
            /*addrlen=*/0x6e);
    break;
  case 3:
    //  socket$nl_netfilter arguments: [
    //    domain: const = 0x10 (4 bytes)
    //    type: const = 0x3 (4 bytes)
    //    proto: const = 0xc (4 bytes)
    //  ]
    //  returns sock_nl_netfilter
    res = syscall(__NR_socket, /*domain=*/0x10, /*type=*/3, /*proto=*/0xc);
    if (res != -1)
      r[2] = res;
    break;
  case 4:
    //  sendmsg$NFT_BATCH arguments: [
    //    fd: sock_nl_netfilter (resource)
    //    msg: nil
    //    f: send_flags = 0x0 (4 bytes)
    //  ]
    syscall(__NR_sendmsg, /*fd=*/(intptr_t)r[2], /*msg=*/0, /*f=*/0);
    break;
  case 5:
    //  sendmmsg$unix arguments: [
    //    fd: sock_unix (resource)
    //    mmsg: ptr[in, array[send_mmsghdr_un]] {
    //      array[send_mmsghdr_un] {
    //      }
    //    }
    //    vlen: len = 0x318 (4 bytes)
    //    f: send_flags = 0x0 (4 bytes)
    //  ]
    syscall(__NR_sendmmsg, /*fd=*/(intptr_t)r[1], /*mmsg=*/0x800bd000,
            /*vlen=*/0x318, /*f=*/0);
    break;
  case 6:
    //  openat$nvme_fabrics arguments: [
    //    fd: const = 0xffffffffffffff9c (4 bytes)
    //    file: ptr[in, buffer] {
    //      buffer: {2f 64 65 76 2f 6e 76 6d 65 2d 66 61 62 72 69 63 73 00}
    //      (length 0x12)
    //    }
    //    flags: open_flags = 0x2 (4 bytes)
    //    mode: const = 0x0 (2 bytes)
    //  ]
    //  returns fd
    NONFAILING(memcpy((void*)0x80000100, "/dev/nvme-fabrics\000", 18));
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x80000100,
                  /*flags=O_RDWR*/ 2, /*mode=*/0);
    if (res != -1)
      r[3] = res;
    break;
  case 7:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {74 72 61 6e 73 70 6f 72 74 3d 74 63 70 2c 74 72 61 64 64 72
    //      3d 31 32 37 2e 30 2e 30 2e 31 2c 74 72 73 76 63 69 64 3d 34 34 32 30
    //      2c 6e 71 6e 3d 74} (length 0x31)
    //    }
    //    count: len = 0x31 (4 bytes)
    //  ]
    NONFAILING(memcpy((void*)0x80000200,
                      "transport=tcp,traddr=127.0.0.1,trsvcid=4420,nqn=t", 49));
    syscall(__NR_write, /*fd=*/(intptr_t)r[3], /*buf=*/0x80000200,
            /*count=*/0x31);
    break;
  case 8:
    //  ioctl$AUTOFS_DEV_IOCTL_VERSION arguments: [
    //    fd: fd_autofs (resource)
    //    cmd: const = 0xc0189371 (4 bytes)
    //    arg: ptr[inout, autofs_dev_ioctl[void]] {
    //      autofs_dev_ioctl[void] {
    //        base: autofs_dev_ioctl_base[void] {
    //          ver_major: const = 0x1 (4 bytes)
    //          ver_minor: const = 0x1 (4 bytes)
    //          size: len = 0x18 (4 bytes)
    //          ioctlfd: fd (resource)
    //          content: buffer: {} (length 0x0)
    //          pad = 0x0 (8 bytes)
    //        }
    //        path: buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //      }
    //    }
    //  ]
    NONFAILING(*(uint32_t*)0x80000140 = 1);
    NONFAILING(*(uint32_t*)0x80000144 = 1);
    NONFAILING(*(uint32_t*)0x80000148 = 0x18);
    NONFAILING(*(uint32_t*)0x8000014c = r[0]);
    NONFAILING(memcpy((void*)0x80000158, "./file0\000", 8));
    syscall(__NR_ioctl, /*fd=*/(intptr_t)r[3], /*cmd=*/0xc0189371,
            /*arg=*/0x80000140);
    break;
  case 9:
    //  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: nil
    //    dev_info_ptr: ptr[out, dev_info_ptr] {
    //      dev_info_ptr (resource)
    //    }
    //  ]
    //  returns ublk_dev_id
    NONFAILING(syz_ublk_add_dev(/*fd_io_uring=*/-1, /*ring_params_ptr=*/0,
                                /*ring_ptr=*/0, /*sqes_ptr=*/0, /*sqe=*/0,
                                /*dev_info_ptr=*/0x80000480));
    break;
  case 10:
    //  dup arguments: [
    //    oldfd: fd (resource)
    //  ]
    //  returns fd
    syscall(__NR_dup, /*oldfd=*/(intptr_t)-1);
    break;
  case 11:
    //  bpf$PROG_LOAD_XDP arguments: [
    //    cmd: const = 0x5 (4 bytes)
    //    arg: ptr[in, bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32],
    //    const[BPF_XDP, int32], const[0, int32], const[0, int32]]] {
    //      bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32], const[BPF_XDP, int32],
    //      const[0, int32], const[0, int32]] {
    //        type: const = 0x6 (4 bytes)
    //        ninsn: bytesize8 = 0x3 (4 bytes)
    //        insns: nil
    //        license: nil
    //        loglev: int32 = 0x0 (4 bytes)
    //        logsize: len = 0xffffffffffffff4f (4 bytes)
    //        log: nil
    //        kern_version: bpf_kern_version = 0x0 (4 bytes)
    //        flags: bpf_prog_load_flags = 0x7 (4 bytes)
    //        prog_name: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    //        00} (length 0x10) prog_ifindex: ifindex (resource)
    //        expected_attach_type: const = 0x25 (4 bytes)
    //        btf_fd: fd_btf (resource)
    //        func_info_rec_size: const = 0x8 (4 bytes)
    //        func_info: nil
    //        func_info_cnt: len = 0x0 (4 bytes)
    //        line_info_rec_size: const = 0x10 (4 bytes)
    //        line_info: nil
    //        line_info_cnt: len = 0x0 (4 bytes)
    //        attach_btf_id: const = 0x0 (4 bytes)
    //        attach_prog_fd: const = 0x0 (4 bytes)
    //        core_relo_cnt: len = 0x0 (4 bytes)
    //        fd_array: nil
    //        core_relos: nil
    //        core_relo_rec_size: const = 0x10 (4 bytes)
    //        log_true_size: int32 = 0x0 (4 bytes)
    //        prog_token_fd: union _bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32],
    //        const[BPF_XDP, int32], const[0, int32], const[0,
    //        int32]]_prog_token_fd_wrapper {
    //          void: buffer: {} (length 0x0)
    //        }
    //        pad: union _bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32],
    //        const[BPF_XDP, int32], const[0, int32], const[0,
    //        int32]]_pad_wrapper {
    //          value: const = 0x0 (4 bytes)
    //        }
    //      }
    //    }
    //    size: len = 0x94 (4 bytes)
    //  ]
    //  returns fd_bpf_prog_xdp
    NONFAILING(*(uint32_t*)0x80000340 = 6);
    NONFAILING(*(uint32_t*)0x80000344 = 3);
    NONFAILING(*(uint64_t*)0x80000348 = 0);
    NONFAILING(*(uint64_t*)0x80000350 = 0);
    NONFAILING(*(uint32_t*)0x80000358 = 0);
    NONFAILING(*(uint32_t*)0x8000035c = 0xffffff4f);
    NONFAILING(*(uint64_t*)0x80000360 = 0);
    NONFAILING(*(uint32_t*)0x80000368 = 0);
    NONFAILING(*(uint32_t*)0x8000036c = 7);
    NONFAILING(memset((void*)0x80000370, 0, 16));
    NONFAILING(*(uint32_t*)0x80000380 = 0);
    NONFAILING(*(uint32_t*)0x80000384 = 0x25);
    NONFAILING(*(uint32_t*)0x80000388 = -1);
    NONFAILING(*(uint32_t*)0x8000038c = 8);
    NONFAILING(*(uint64_t*)0x80000390 = 0);
    NONFAILING(*(uint32_t*)0x80000398 = 0);
    NONFAILING(*(uint32_t*)0x8000039c = 0x10);
    NONFAILING(*(uint64_t*)0x800003a0 = 0);
    NONFAILING(*(uint32_t*)0x800003a8 = 0);
    NONFAILING(*(uint32_t*)0x800003ac = 0);
    NONFAILING(*(uint32_t*)0x800003b0 = 0);
    NONFAILING(*(uint32_t*)0x800003b4 = 0);
    NONFAILING(*(uint64_t*)0x800003b8 = 0);
    NONFAILING(*(uint64_t*)0x800003c0 = 0);
    NONFAILING(*(uint32_t*)0x800003c8 = 0x10);
    NONFAILING(*(uint32_t*)0x800003cc = 0);
    NONFAILING(*(uint32_t*)0x800003d0 = 0);
    syscall(__NR_bpf, /*cmd=*/5, /*arg=*/0x80000340, /*size=*/0x94);
    break;
  case 12:
    //  recvmmsg arguments: [
    //    fd: sock (resource)
    //    mmsg: ptr[in, array[recv_mmsghdr]] {
    //      array[recv_mmsghdr] {
    //      }
    //    }
    //    vlen: len = 0x10106 (4 bytes)
    //    f: recv_flags = 0x2 (4 bytes)
    //    timeout: nil
    //  ]
    syscall(__NR_recvmmsg, /*fd=*/(intptr_t)r[0], /*mmsg=*/0x800000c0,
            /*vlen=*/0x10106, /*f=MSG_PEEK*/ 2, /*timeout=*/0);
    break;
  case 13:
    //  socket$kcm arguments: [
    //    domain: const = 0x10 (4 bytes)
    //    type: kcm_socket_type = 0x2 (4 bytes)
    //    proto: const = 0x4 (4 bytes)
    //  ]
    //  returns sock_kcm
    res = syscall(__NR_socket, /*domain=*/0x10, /*type=SOCK_DGRAM*/ 2,
                  /*proto=*/4);
    if (res != -1)
      r[4] = res;
    break;
  case 14:
    //  sendmsg$kcm arguments: [
    //    fd: sock_kcm (resource)
    //    msg: ptr[in, send_msghdr] {
    //      send_msghdr {
    //        msg_name: nil
    //        msg_namelen: len = 0x0 (4 bytes)
    //        msg_iov: ptr[in, array[iovec[in, array[int8]]]] {
    //          array[iovec[in, array[int8]]] {
    //            iovec[in, array[int8]] {
    //              addr: ptr[in, buffer] {
    //                buffer: {89 00 00 00 12 00 81 ae 08 06 0c dc 03 00 00 00
    //                7f 03 e3 f7 00 00 00 00 6e e2 ff ca 1b 1f 33 17 00 00 04
    //                c0 0e 72 f7 50 37 5e d0 8a 56 33 1d bf 9e d7 81 5e 38 1a
    //                d6 e7 47 03 3a 00 93 b8 37 dc 6c c0 1e 32 ef ae c8 c7 a6
    //                ec 00 12 10 00 01 40 0a 0c 0c 00 bd ad 44 6b 9b bc 7a 46
    //                e3 98 82 85 dc df 12 f2 13 08 f8 68 fe ce 01 95 5f ed 00
    //                09 d7 8f 0a 94 7e e2 b4 9e 33 53 8a fa 8a f9 23 47 51 4f
    //                0b 56 a2 0f f2 7f ff} (length 0x89)
    //              }
    //              len: len = 0x89 (4 bytes)
    //            }
    //          }
    //        }
    //        msg_iovlen: len = 0x1 (4 bytes)
    //        msg_control: nil
    //        msg_controllen: bytesize = 0x0 (4 bytes)
    //        msg_flags: const = 0x0 (4 bytes)
    //      }
    //    }
    //    f: send_flags = 0x4004010 (4 bytes)
    //  ]
    NONFAILING(*(uint32_t*)0x80000240 = 0);
    NONFAILING(*(uint32_t*)0x80000244 = 0);
    NONFAILING(*(uint32_t*)0x80000248 = 0x80000000);
    NONFAILING(*(uint32_t*)0x80000000 = 0x80000440);
    NONFAILING(memcpy(
        (void*)0x80000440,
        "\x89\x00\x00\x00\x12\x00\x81\xae\x08\x06\x0c\xdc\x03\x00\x00\x00\x7f"
        "\x03\xe3\xf7\x00\x00\x00\x00\x6e\xe2\xff\xca\x1b\x1f\x33\x17\x00\x00"
        "\x04\xc0\x0e\x72\xf7\x50\x37\x5e\xd0\x8a\x56\x33\x1d\xbf\x9e\xd7\x81"
        "\x5e\x38\x1a\xd6\xe7\x47\x03\x3a\x00\x93\xb8\x37\xdc\x6c\xc0\x1e\x32"
        "\xef\xae\xc8\xc7\xa6\xec\x00\x12\x10\x00\x01\x40\x0a\x0c\x0c\x00\xbd"
        "\xad\x44\x6b\x9b\xbc\x7a\x46\xe3\x98\x82\x85\xdc\xdf\x12\xf2\x13\x08"
        "\xf8\x68\xfe\xce\x01\x95\x5f\xed\x00\x09\xd7\x8f\x0a\x94\x7e\xe2\xb4"
        "\x9e\x33\x53\x8a\xfa\x8a\xf9\x23\x47\x51\x4f\x0b\x56\xa2\x0f\xf2\x7f"
        "\xff",
        137));
    NONFAILING(*(uint32_t*)0x80000004 = 0x89);
    NONFAILING(*(uint32_t*)0x8000024c = 1);
    NONFAILING(*(uint32_t*)0x80000250 = 0);
    NONFAILING(*(uint32_t*)0x80000254 = 0);
    NONFAILING(*(uint32_t*)0x80000258 = 0);
    syscall(__NR_sendmsg, /*fd=*/(intptr_t)r[4], /*msg=*/0x80000240,
            /*f=MSG_ZEROCOPY|MSG_PROBE|MSG_NOSIGNAL*/ 0x4004010);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x7ffff000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x80000000, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x81000000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}