// https://syzkaller.appspot.com/bug?id=11c50242b350e92e4d1e8ab042997a8ed55d1dc1
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <netinet/in.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/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/socket.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/futex.h>
#include <linux/genetlink.h>
#include <linux/if_addr.h>
#include <linux/if_link.h>
#include <linux/in6.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/veth.h>

#ifndef __NR_connect
#define __NR_connect 203
#endif
#ifndef __NR_io_uring_enter
#define __NR_io_uring_enter 426
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_mount
#define __NR_mount 40
#endif
#ifndef __NR_mprotect
#define __NR_mprotect 226
#endif
#ifndef __NR_openat
#define __NR_openat 56
#endif
#ifndef __NR_prlimit64
#define __NR_prlimit64 261
#endif
#ifndef __NR_recvmmsg
#define __NR_recvmmsg 243
#endif
#ifndef __NR_sched_setscheduler
#define __NR_sched_setscheduler 119
#endif
#ifndef __NR_sendmmsg
#define __NR_sendmmsg 269
#endif
#ifndef __NR_socketpair
#define __NR_socketpair 199
#endif

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;
}

struct nlmsg {
  char* pos;
  int nesting;
  struct nlattr* nested[8];
  char buf[4096];
};

static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
                         const void* data, int size)
{
  memset(nlmsg, 0, sizeof(*nlmsg));
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_type = typ;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
  memcpy(hdr + 1, data, size);
  nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
}

static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data,
                         int size)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_len = sizeof(*attr) + size;
  attr->nla_type = typ;
  if (size > 0)
    memcpy(attr + 1, data, size);
  nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}

static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type,
                            int* reply_len, bool dofail)
{
  if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
    exit(1);
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
  struct sockaddr_nl addr;
  memset(&addr, 0, sizeof(addr));
  addr.nl_family = AF_NETLINK;
  ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0,
                     (struct sockaddr*)&addr, sizeof(addr));
  if (n != (ssize_t)hdr->nlmsg_len) {
    if (dofail)
      exit(1);
    return -1;
  }
  n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  if (reply_len)
    *reply_len = 0;
  if (n < 0) {
    if (dofail)
      exit(1);
    return -1;
  }
  if (n < (ssize_t)sizeof(struct nlmsghdr)) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type == NLMSG_DONE)
    return 0;
  if (reply_len && hdr->nlmsg_type == reply_type) {
    *reply_len = n;
    return 0;
  }
  if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type != NLMSG_ERROR) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  errno = -((struct nlmsgerr*)(hdr + 1))->error;
  return -errno;
}

static int netlink_query_family_id(struct nlmsg* nlmsg, int sock,
                                   const char* family_name, bool dofail)
{
  struct genlmsghdr genlhdr;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = CTRL_CMD_GETFAMILY;
  netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name,
               strnlen(family_name, GENL_NAMSIZ - 1) + 1);
  int n = 0;
  int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail);
  if (err < 0) {
    return -1;
  }
  uint16_t id = 0;
  struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN +
                                         NLMSG_ALIGN(sizeof(genlhdr)));
  for (; (char*)attr < nlmsg->buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
      id = *(uint16_t*)(attr + 1);
      break;
    }
  }
  if (!id) {
    errno = EINVAL;
    return -1;
  }
  recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  return id;
}

#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);
}

static long syz_genetlink_get_family_id(volatile long name,
                                        volatile long sock_arg)
{
  int fd = sock_arg;
  if (fd < 0) {
    fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
    if (fd == -1) {
      return -1;
    }
  }
  struct nlmsg nlmsg_tmp;
  int ret = netlink_query_family_id(&nlmsg_tmp, fd, (char*)name, false);
  if ((int)sock_arg < 0)
    close(fd);
  if (ret < 0) {
    return -1;
  }
  return ret;
}

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 < 16; 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[7] = {0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0x0,
                 0x0,
                 0x0};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  prlimit64 arguments: [
    //    pid: pid (resource)
    //    res: rlimit_type = 0xe (8 bytes)
    //    new: ptr[in, rlimit] {
    //      rlimit {
    //        soft: intptr = 0x7 (8 bytes)
    //        hard: intptr = 0x100 (8 bytes)
    //      }
    //    }
    //    old: nil
    //  ]
    NONFAILING(*(uint64_t*)0x20000140 = 7);
    NONFAILING(*(uint64_t*)0x20000148 = 0x100);
    syscall(__NR_prlimit64, /*pid=*/0, /*res=RLIMIT_RTPRIO*/ 0xeul,
            /*new=*/0x20000140ul, /*old=*/0ul);
    break;
  case 1:
    //  sched_setscheduler arguments: [
    //    pid: pid (resource)
    //    policy: sched_policy = 0x1 (8 bytes)
    //    prio: ptr[in, int32] {
    //      int32 = 0x7 (4 bytes)
    //    }
    //  ]
    NONFAILING(*(uint32_t*)0x20000380 = 7);
    syscall(__NR_sched_setscheduler, /*pid=*/0, /*policy=SCHED_FIFO*/ 1ul,
            /*prio=*/0x20000380ul);
    break;
  case 2:
    //  socketpair$unix arguments: [
    //    domain: const = 0x1 (8 bytes)
    //    type: unix_socket_type = 0x2 (8 bytes)
    //    proto: const = 0x0 (4 bytes)
    //    fds: ptr[out, unix_pair] {
    //      unix_pair {
    //        fd0: sock_unix (resource)
    //        fd1: sock_unix (resource)
    //      }
    //    }
    //  ]
    res = syscall(__NR_socketpair, /*domain=*/1ul, /*type=SOCK_DGRAM*/ 2ul,
                  /*proto=*/0, /*fds=*/0x20000200ul);
    if (res != -1) {
      NONFAILING(r[0] = *(uint32_t*)0x20000200);
      NONFAILING(r[1] = *(uint32_t*)0x20000204);
    }
    break;
  case 3:
    //  connect$unix arguments: [
    //    fd: sock_unix (resource)
    //    addr: nil
    //    addrlen: len = 0x0 (8 bytes)
    //  ]
    syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0ul, /*addrlen=*/0ul);
    break;
  case 4:
    //  sendmmsg$unix arguments: [
    //    fd: sock_unix (resource)
    //    mmsg: ptr[in, array[send_mmsghdr_un]] {
    //      array[send_mmsghdr_un] {
    //      }
    //    }
    //    vlen: len = 0x651 (8 bytes)
    //    f: send_flags = 0x0 (8 bytes)
    //  ]
    syscall(__NR_sendmmsg, /*fd=*/r[1], /*mmsg=*/0x20000000ul, /*vlen=*/0x651ul,
            /*f=*/0ul);
    break;
  case 5:
    //  recvmmsg arguments: [
    //    fd: sock (resource)
    //    mmsg: ptr[in, array[recv_mmsghdr]] {
    //      array[recv_mmsghdr] {
    //      }
    //    }
    //    vlen: len = 0x10106 (8 bytes)
    //    f: recv_flags = 0x2 (8 bytes)
    //    timeout: nil
    //  ]
    syscall(__NR_recvmmsg, /*fd=*/r[0], /*mmsg=*/0x200000c0ul,
            /*vlen=*/0x10106ul, /*f=MSG_PEEK*/ 2ul, /*timeout=*/0ul);
    break;
  case 6:
    //  sched_setscheduler arguments: [
    //    pid: pid (resource)
    //    policy: sched_policy = 0x2 (8 bytes)
    //    prio: nil
    //  ]
    syscall(__NR_sched_setscheduler, /*pid=*/0, /*policy=SCHED_RR*/ 2ul,
            /*prio=*/0ul);
    break;
  case 7:
    //  openat$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*)0x20000000, "/dev/ublk-control\000", 18));
    res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                  /*file=*/0x20000000ul, /*flags=*/2, /*mode=*/0);
    if (res != -1)
      r[2] = res;
    break;
  case 8:
    //  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*)0x20000044 = 0);
    NONFAILING(*(uint32_t*)0x20000048 = 0);
    NONFAILING(*(uint32_t*)0x2000004c = 0);
    NONFAILING(*(uint32_t*)0x20000050 = 0);
    NONFAILING(*(uint32_t*)0x20000058 = -1);
    NONFAILING(memset((void*)0x2000005c, 0, 12));
    res = -1;
    NONFAILING(res = syz_ublk_setup_io_uring(
                   /*entries=*/0x20, /*params=*/0x20000040,
                   /*ring_params_ptr=*/0x200000c0, /*ring_ptr=*/0x20000100,
                   /*sqes_ptr=*/0x20000140));
    if (res != -1) {
      r[3] = res;
      NONFAILING(r[4] = *(uint64_t*)0x200000c0);
      NONFAILING(r[5] = *(uint64_t*)0x20000100);
      NONFAILING(r[6] = *(uint64_t*)0x20000140);
    }
    break;
  case 9:
    //  syz_io_uring_submit$UBLK arguments: [
    //    ring_params_ptr: ring_params_ptr (resource)
    //    ring_ptr: ring_ptr (resource)
    //    sqes_ptr: sqes_ptr (resource)
    //    sqe: ptr[inout, ublk_cmd_sqe_u] {
    //      union ublk_cmd_sqe_u {
    //        ublk_add_dev_sqe: io_uring_sqe_uring[fd_ublk_ctrl,
    //        const[UBLK_U_CMD_ADD_DEV, int32], ublk_ctrl_cmd$add_dev, int64] {
    //          opcode: const = 0x2e (1 bytes)
    //          flags: iosqe_flags = 0x0 (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 = 0x200000 (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 = 0x161 (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 = 0x27 (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)
    //          }
    //        }
    //      }
    //    }
    //  ]
    NONFAILING(*(uint8_t*)0x20000200 = 0x2e);
    NONFAILING(*(uint8_t*)0x20000201 = 0);
    NONFAILING(*(uint16_t*)0x20000202 = 0);
    NONFAILING(*(uint32_t*)0x20000204 = r[2]);
    NONFAILING(*(uint32_t*)0x20000208 = 0xc0207504);
    NONFAILING(*(uint32_t*)0x2000020c = 0);
    NONFAILING(*(uint64_t*)0x20000210 = 0);
    NONFAILING(*(uint32_t*)0x20000218 = 0);
    NONFAILING(*(uint32_t*)0x2000021c = 0);
    NONFAILING(*(uint64_t*)0x20000220 = 0x200000);
    NONFAILING(*(uint16_t*)0x20000228 = 0);
    NONFAILING(*(uint16_t*)0x2000022a = 0);
    NONFAILING(memset((void*)0x2000022c, 0, 4));
    NONFAILING(*(uint32_t*)0x20000230 = -1);
    NONFAILING(*(uint16_t*)0x20000234 = -1);
    NONFAILING(*(uint16_t*)0x20000236 = 0x40);
    NONFAILING(*(uint64_t*)0x20000238 = 0x20800000);
    NONFAILING(*(uint16_t*)0x20800000 = 3);
    NONFAILING(*(uint16_t*)0x20800002 = 0x161);
    NONFAILING(*(uint16_t*)0x20800004 = 0);
    NONFAILING(*(uint16_t*)0x20800006 = 0);
    NONFAILING(*(uint32_t*)0x20800008 = 0x1000);
    NONFAILING(*(uint32_t*)0x2080000c = -1);
    NONFAILING(*(uint32_t*)0x20800010 = 0);
    NONFAILING(*(uint32_t*)0x20800014 = 0);
    NONFAILING(*(uint64_t*)0x20800018 = 0x27);
    NONFAILING(*(uint64_t*)0x20800020 = 0);
    NONFAILING(*(uint32_t*)0x20800028 = 0);
    NONFAILING(*(uint32_t*)0x2080002c = 0);
    NONFAILING(*(uint64_t*)0x20800030 = 0);
    NONFAILING(*(uint64_t*)0x20800038 = 0);
    NONFAILING(*(uint64_t*)0x20000240 = 0);
    NONFAILING(*(uint16_t*)0x20000248 = 0);
    NONFAILING(*(uint16_t*)0x2000024a = 0);
    NONFAILING(*(uint32_t*)0x2000024c = 0);
    NONFAILING(memset((void*)0x20000250, 0, 48));
    NONFAILING(syz_io_uring_submit(/*ring_params_ptr=*/r[4], /*ring_ptr=*/r[5],
                                   /*sqes_ptr=*/r[6], /*sqe=*/0x20000200));
    break;
  case 10:
    //  mprotect arguments: [
    //    addr: VMA[0x1000]
    //    len: len = 0x1000 (8 bytes)
    //    prot: mmap_prot = 0x1 (8 bytes)
    //  ]
    syscall(__NR_mprotect, /*addr=*/0x20800000ul, /*len=*/0x1000ul,
            /*prot=PROT_READ*/ 1ul);
    break;
  case 11:
    //  mount arguments: [
    //    src: nil
    //    dst: nil
    //    type: nil
    //    flags: mount_flags = 0x1004000 (8 bytes)
    //    data: nil
    //  ]
    syscall(__NR_mount, /*src=*/0ul, /*dst=*/0ul, /*type=*/0ul,
            /*flags=MS_REC|MS_STRICTATIME*/ 0x1004000ul, /*data=*/0ul);
    break;
  case 12:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: nil
    //    flags: open_flags = 0x2 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0ul, /*flags=O_RDWR*/ 2,
            /*mode=*/0);
    break;
  case 13:
    //  socketpair arguments: [
    //    domain: socket_domain = 0x1 (8 bytes)
    //    type: socket_type = 0x1 (8 bytes)
    //    proto: int32 = 0x0 (4 bytes)
    //    fds: nil
    //  ]
    syscall(__NR_socketpair, /*domain=AF_UNIX*/ 1ul, /*type=SOCK_STREAM*/ 1ul,
            /*proto=*/0, /*fds=*/0ul);
    break;
  case 14:
    //  syz_genetlink_get_family_id$nbd arguments: [
    //    name: nil
    //    fd: sock_nl_generic_init (resource)
    //  ]
    //  returns genl_nbd_family_id
    NONFAILING(syz_genetlink_get_family_id(/*name=*/0, /*fd=*/-1));
    break;
  case 15:
    //  io_uring_enter arguments: [
    //    fd: fd_io_uring (resource)
    //    to_submit: int32 = 0x1 (4 bytes)
    //    min_complete: int32 = 0x1 (4 bytes)
    //    flags: io_uring_enter_flags = 0x1 (8 bytes)
    //    sigmask: nil
    //    size: len = 0x0 (8 bytes)
    //  ]
    syscall(__NR_io_uring_enter, /*fd=*/r[3], /*to_submit=*/1,
            /*min_complete=*/1, /*flags=IORING_ENTER_GETEVENTS*/ 1ul,
            /*sigmask=*/0ul, /*size=*/0ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*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=*/0x21000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}