// https://syzkaller.appspot.com/bug?id=ec2b7d3abe149ac2afaeab7d1a452a83ca7f0c63
// 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/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/futex.h>

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;
}

const int kInitNetNsFd = 201;

static long syz_init_net_socket(volatile long domain, volatile long type,
                                volatile long proto)
{
  return syscall(__NR_socket, domain, type, proto);
}

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 < 13; 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[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  pipe2$9p arguments: [
    //    pipefd: ptr[out, pipe_9p] {
    //      pipe_9p {
    //        rfd: rfd9p (resource)
    //        wfd: wfd9p (resource)
    //      }
    //    }
    //    flags: pipe_flags = 0x0 (8 bytes)
    //  ]
    res = syscall(__NR_pipe2, /*pipefd=*/0x200000000000ul, /*flags=*/0ul);
    if (res != -1) {
      NONFAILING(r[0] = *(uint32_t*)0x200000000000);
      NONFAILING(r[1] = *(uint32_t*)0x200000000004);
    }
    break;
  case 1:
    //  pipe2$9p arguments: [
    //    pipefd: ptr[out, pipe_9p] {
    //      pipe_9p {
    //        rfd: rfd9p (resource)
    //        wfd: wfd9p (resource)
    //      }
    //    }
    //    flags: pipe_flags = 0x0 (8 bytes)
    //  ]
    res = syscall(__NR_pipe2, /*pipefd=*/0x200000000010ul, /*flags=*/0ul);
    if (res != -1)
      NONFAILING(r[2] = *(uint32_t*)0x200000000014);
    break;
  case 2:
    //  mkdirat arguments: [
    //    fd: fd_dir (resource)
    //    path: ptr[in, buffer] {
    //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
    //    }
    //    mode: open_mode = 0x1ff (8 bytes)
    //  ]
    NONFAILING(memcpy((void*)0x200000000200, "./mnt\000", 6));
    syscall(
        __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000000200ul,
        /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
        0x1fful);
    break;
  case 3:
    //  mount$9p_fd arguments: [
    //    src: const = 0x0 (8 bytes)
    //    dst: ptr[in, buffer] {
    //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
    //    }
    //    type: ptr[in, buffer] {
    //      buffer: {39 70 00} (length 0x3)
    //    }
    //    flags: mount_flags = 0x0 (8 bytes)
    //    opts: ptr[in, p9_options_fd] {
    //      p9_options_fd {
    //        trans: buffer: {74 72 61 6e 73 3d 66 64 2c} (length 0x9)
    //        rfdno: fs_opt["rfdno", fmt[hex, rfd9p]] {
    //          name: buffer: {72 66 64 6e 6f} (length 0x5)
    //          eq: const = 0x3d (1 bytes)
    //          val: rfd9p (resource)
    //        }
    //        comma0: const = 0x2c (1 bytes)
    //        wfdno: fs_opt["wfdno", fmt[hex, fd]] {
    //          name: buffer: {77 66 64 6e 6f} (length 0x5)
    //          eq: const = 0x3d (1 bytes)
    //          val: fd (resource)
    //        }
    //        comma1: const = 0x2c (1 bytes)
    //        opts: fs_options[p9_options] {
    //          elems: array[fs_opt_elem[p9_options]] {
    //            fs_opt_elem[p9_options] {
    //              elem: union p9_options {
    //                posixacl: buffer: {70 6f 73 69 78 61 63 6c} (length 0x8)
    //              }
    //              comma: const = 0x2c (1 bytes)
    //            }
    //            fs_opt_elem[p9_options] {
    //              elem: union p9_options {
    //                noextend: buffer: {6e 6f 65 78 74 65 6e 64} (length 0x8)
    //              }
    //              comma: const = 0x2c (1 bytes)
    //            }
    //            fs_opt_elem[p9_options] {
    //              elem: union p9_options {
    //                noxattr: buffer: {6e 6f 78 61 74 74 72} (length 0x7)
    //              }
    //              comma: const = 0x2c (1 bytes)
    //            }
    //            fs_opt_elem[p9_options] {
    //              elem: union p9_options {
    //                ignoreqv: buffer: {69 67 6e 6f 72 65 71 76} (length 0x8)
    //              }
    //              comma: const = 0x2c (1 bytes)
    //            }
    //          }
    //          common: array[fs_opt_elem[fs_options_common]] {
    //          }
    //          null: const = 0x0 (1 bytes)
    //        }
    //      }
    //    }
    //  ]
    NONFAILING(memcpy((void*)0x200000000200, "./mnt\000", 6));
    NONFAILING(memcpy((void*)0x200000000240, "9p\000", 3));
    NONFAILING(memcpy((void*)0x200000000180, "trans=fd,", 9));
    NONFAILING(memcpy((void*)0x200000000189, "rfdno", 5));
    NONFAILING(*(uint8_t*)0x20000000018e = 0x3d);
    NONFAILING(sprintf((char*)0x20000000018f, "0x%016llx", (long long)r[0]));
    NONFAILING(*(uint8_t*)0x2000000001a1 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001a2, "wfdno", 5));
    NONFAILING(*(uint8_t*)0x2000000001a7 = 0x3d);
    NONFAILING(sprintf((char*)0x2000000001a8, "0x%016llx", (long long)r[2]));
    NONFAILING(*(uint8_t*)0x2000000001ba = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001bb, "posixacl", 8));
    NONFAILING(*(uint8_t*)0x2000000001c3 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001c4, "noextend", 8));
    NONFAILING(*(uint8_t*)0x2000000001cc = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001cd, "noxattr", 7));
    NONFAILING(*(uint8_t*)0x2000000001d4 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001d5, "ignoreqv", 8));
    NONFAILING(*(uint8_t*)0x2000000001dd = 0x2c);
    NONFAILING(*(uint8_t*)0x2000000001de = 0);
    syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200000000200ul,
            /*type=*/0x200000000240ul, /*flags=*/0ul,
            /*opts=*/0x200000000180ul);
    break;
  case 4:
    //  write$P9_RVERSION arguments: [
    //    fd: wfd9p (resource)
    //    data: ptr[in, p9_rversion] {
    //      p9_rversion {
    //        size: bytesize = 0x15 (4 bytes)
    //        type: const = 0x65 (1 bytes)
    //        tag: const = 0xffff (2 bytes)
    //        msize: int32 = 0x2000 (4 bytes)
    //        version_len: len = 0x8 (2 bytes)
    //        version: buffer: {39 50 32 30 30 30 2e 4c} (length 0x8)
    //      }
    //    }
    //    size: bytesize = 0x15 (8 bytes)
    //  ]
    NONFAILING(*(uint32_t*)0x200000000040 = 0x15);
    NONFAILING(*(uint8_t*)0x200000000044 = 0x65);
    NONFAILING(*(uint16_t*)0x200000000045 = -1);
    NONFAILING(*(uint32_t*)0x200000000047 = 0x2000);
    NONFAILING(*(uint16_t*)0x20000000004b = 8);
    NONFAILING(memcpy((void*)0x20000000004d, "9P2000.L", 8));
    syscall(__NR_write, /*fd=*/r[1], /*data=*/0x200000000040ul,
            /*size=*/0x15ul);
    break;
  case 5:
    //  write$P9_RATTACH arguments: [
    //    fd: wfd9p (resource)
    //    data: ptr[in, p9_msg[P9_RATTACH, p9_qid]] {
    //      p9_msg[P9_RATTACH, p9_qid] {
    //        size: bytesize = 0x14 (4 bytes)
    //        type: const = 0x69 (1 bytes)
    //        tag: int16 = 0x0 (2 bytes)
    //        payload: p9_qid {
    //          type: p9_qid_types = 0x80 (1 bytes)
    //          version: int32 = 0x0 (4 bytes)
    //          path: int64 = 0x0 (8 bytes)
    //        }
    //      }
    //    }
    //    size: bytesize = 0x14 (8 bytes)
    //  ]
    NONFAILING(*(uint32_t*)0x200000000080 = 0x14);
    NONFAILING(*(uint8_t*)0x200000000084 = 0x69);
    NONFAILING(*(uint16_t*)0x200000000085 = 0);
    NONFAILING(*(uint8_t*)0x200000000087 = 0x80);
    NONFAILING(*(uint32_t*)0x200000000088 = 0);
    NONFAILING(*(uint64_t*)0x20000000008c = 0);
    syscall(__NR_write, /*fd=*/r[1], /*data=*/0x200000000080ul,
            /*size=*/0x14ul);
    break;
  case 6:
    //  openat$tun arguments: [
    //    fd: const = 0xffffffffffffff9c (8 bytes)
    //    file: nil
    //    flags: open_flags = 0xa0001 (4 bytes)
    //    mode: const = 0x0 (2 bytes)
    //  ]
    //  returns fd_tun
    syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0ul,
            /*flags=O_NOFOLLOW|O_CLOEXEC|O_WRONLY*/ 0xa0001, /*mode=*/0);
    break;
  case 7:
    //  syz_init_net_socket$bt_hci arguments: [
    //    fam: const = 0x1f (8 bytes)
    //    type: const = 0x3 (8 bytes)
    //    proto: const = 0x1 (8 bytes)
    //  ]
    //  returns sock_bt_hci
    res = -1;
    NONFAILING(res =
                   syz_init_net_socket(/*fam=*/0x1f, /*type=*/3, /*proto=*/1));
    if (res != -1)
      r[3] = res;
    break;
  case 8:
    //  bind$bt_hci arguments: [
    //    fd: sock_bt_hci (resource)
    //    addr: nil
    //    addrlen: len = 0x0 (8 bytes)
    //  ]
    syscall(__NR_bind, /*fd=*/r[3], /*addr=*/0ul, /*addrlen=*/0ul);
    break;
  case 9:
    //  write$P9_RGETATTR arguments: [
    //    fd: wfd9p (resource)
    //    data: ptr[in, p9_msg[P9_RGETATTR, p9_rgetattr]] {
    //      p9_msg[P9_RGETATTR, p9_rgetattr] {
    //        size: bytesize = 0xa0 (4 bytes)
    //        type: const = 0x19 (1 bytes)
    //        tag: int16 = 0x0 (2 bytes)
    //        payload: p9_rgetattr {
    //          valid: p8_stats_valid = 0x2c9e (8 bytes)
    //          qid: p9_qid {
    //            type: p9_qid_types = 0x80 (1 bytes)
    //            version: int32 = 0x0 (4 bytes)
    //            path: int64 = 0x0 (8 bytes)
    //          }
    //          mode: open_mode = 0x41ed (4 bytes)
    //          uid: uid (resource)
    //          gid: gid (resource)
    //          nlink: int64 = 0x1 (8 bytes)
    //          rdev: int64 = 0x0 (8 bytes)
    //          size: int64 = 0x1000 (8 bytes)
    //          blksize: int64 = 0x7 (8 bytes)
    //          blocks: int64 = 0x8 (8 bytes)
    //          atime_sec: int64 = 0x0 (8 bytes)
    //          atime_nsec: int64 = 0x0 (8 bytes)
    //          mtime_sec: int64 = 0x0 (8 bytes)
    //          mtime_nsec: int64 = 0x0 (8 bytes)
    //          ctime_sec: int64 = 0x0 (8 bytes)
    //          ctime_nsec: int64 = 0x0 (8 bytes)
    //          btime_sec: int64 = 0xffffffffffffffff (8 bytes)
    //          btime_nsec: int64 = 0x1 (8 bytes)
    //          gen: int64 = 0x0 (8 bytes)
    //          data_version: int64 = 0x0 (8 bytes)
    //        }
    //      }
    //    }
    //    size: bytesize = 0xa0 (8 bytes)
    //  ]
    NONFAILING(*(uint32_t*)0x2000000000c0 = 0xa0);
    NONFAILING(*(uint8_t*)0x2000000000c4 = 0x19);
    NONFAILING(*(uint16_t*)0x2000000000c5 = 0);
    NONFAILING(*(uint64_t*)0x2000000000c7 = 0x2c9e);
    NONFAILING(*(uint8_t*)0x2000000000cf = 0x80);
    NONFAILING(*(uint32_t*)0x2000000000d0 = 0);
    NONFAILING(*(uint64_t*)0x2000000000d4 = 0);
    NONFAILING(*(uint32_t*)0x2000000000dc = 0x41ed);
    NONFAILING(*(uint32_t*)0x2000000000e0 = 0);
    NONFAILING(*(uint32_t*)0x2000000000e4 = 0);
    NONFAILING(*(uint64_t*)0x2000000000e8 = 1);
    NONFAILING(*(uint64_t*)0x2000000000f0 = 0);
    NONFAILING(*(uint64_t*)0x2000000000f8 = 0x1000);
    NONFAILING(*(uint64_t*)0x200000000100 = 7);
    NONFAILING(*(uint64_t*)0x200000000108 = 8);
    NONFAILING(*(uint64_t*)0x200000000110 = 0);
    NONFAILING(*(uint64_t*)0x200000000118 = 0);
    NONFAILING(*(uint64_t*)0x200000000120 = 0);
    NONFAILING(*(uint64_t*)0x200000000128 = 0);
    NONFAILING(*(uint64_t*)0x200000000130 = 0);
    NONFAILING(*(uint64_t*)0x200000000138 = 0);
    NONFAILING(*(uint64_t*)0x200000000140 = -1);
    NONFAILING(*(uint64_t*)0x200000000148 = 1);
    NONFAILING(*(uint64_t*)0x200000000150 = 0);
    NONFAILING(*(uint64_t*)0x200000000158 = 0);
    syscall(__NR_write, /*fd=*/r[1], /*data=*/0x2000000000c0ul,
            /*size=*/0xa0ul);
    break;
  case 10:
    //  mount$9p_fd arguments: [
    //    src: const = 0x0 (8 bytes)
    //    dst: ptr[in, buffer] {
    //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
    //    }
    //    type: ptr[in, buffer] {
    //      buffer: {39 70 00} (length 0x3)
    //    }
    //    flags: mount_flags = 0x0 (8 bytes)
    //    opts: ptr[in, p9_options_fd] {
    //      p9_options_fd {
    //        trans: buffer: {74 72 61 6e 73 3d 66 64 2c} (length 0x9)
    //        rfdno: fs_opt["rfdno", fmt[hex, rfd9p]] {
    //          name: buffer: {72 66 64 6e 6f} (length 0x5)
    //          eq: const = 0x3d (1 bytes)
    //          val: rfd9p (resource)
    //        }
    //        comma0: const = 0x2c (1 bytes)
    //        wfdno: fs_opt["wfdno", fmt[hex, fd]] {
    //          name: buffer: {77 66 64 6e 6f} (length 0x5)
    //          eq: const = 0x3d (1 bytes)
    //          val: fd (resource)
    //        }
    //        comma1: const = 0x2c (1 bytes)
    //        opts: fs_options[p9_options] {
    //          elems: array[fs_opt_elem[p9_options]] {
    //            fs_opt_elem[p9_options] {
    //              elem: union p9_options {
    //                posixacl: buffer: {70 6f 73 69 78 61 63 6c} (length 0x8)
    //              }
    //              comma: const = 0x2c (1 bytes)
    //            }
    //            fs_opt_elem[p9_options] {
    //              elem: union p9_options {
    //                noextend: buffer: {6e 6f 65 78 74 65 6e 64} (length 0x8)
    //              }
    //              comma: const = 0x2c (1 bytes)
    //            }
    //            fs_opt_elem[p9_options] {
    //              elem: union p9_options {
    //                noxattr: buffer: {6e 6f 78 61 74 74 72} (length 0x7)
    //              }
    //              comma: const = 0x2c (1 bytes)
    //            }
    //            fs_opt_elem[p9_options] {
    //              elem: union p9_options {
    //                ignoreqv: buffer: {69 67 6e 6f 72 65 71 76} (length 0x8)
    //              }
    //              comma: const = 0x2c (1 bytes)
    //            }
    //          }
    //          common: array[fs_opt_elem[fs_options_common]] {
    //          }
    //          null: const = 0x0 (1 bytes)
    //        }
    //      }
    //    }
    //  ]
    NONFAILING(memcpy((void*)0x200000000200, "./mnt\000", 6));
    NONFAILING(memcpy((void*)0x200000000240, "9p\000", 3));
    NONFAILING(memcpy((void*)0x200000000180, "trans=fd,", 9));
    NONFAILING(memcpy((void*)0x200000000189, "rfdno", 5));
    NONFAILING(*(uint8_t*)0x20000000018e = 0x3d);
    NONFAILING(sprintf((char*)0x20000000018f, "0x%016llx", (long long)r[0]));
    NONFAILING(*(uint8_t*)0x2000000001a1 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001a2, "wfdno", 5));
    NONFAILING(*(uint8_t*)0x2000000001a7 = 0x3d);
    NONFAILING(sprintf((char*)0x2000000001a8, "0x%016llx", (long long)r[2]));
    NONFAILING(*(uint8_t*)0x2000000001ba = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001bb, "posixacl", 8));
    NONFAILING(*(uint8_t*)0x2000000001c3 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001c4, "noextend", 8));
    NONFAILING(*(uint8_t*)0x2000000001cc = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001cd, "noxattr", 7));
    NONFAILING(*(uint8_t*)0x2000000001d4 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000001d5, "ignoreqv", 8));
    NONFAILING(*(uint8_t*)0x2000000001dd = 0x2c);
    NONFAILING(*(uint8_t*)0x2000000001de = 0);
    syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200000000200ul,
            /*type=*/0x200000000240ul, /*flags=*/0ul,
            /*opts=*/0x200000000180ul);
    break;
  case 11:
    //  write$P9_RATTACH arguments: [
    //    fd: wfd9p (resource)
    //    data: ptr[in, p9_msg[P9_RATTACH, p9_qid]] {
    //      p9_msg[P9_RATTACH, p9_qid] {
    //        size: bytesize = 0x14 (4 bytes)
    //        type: const = 0x69 (1 bytes)
    //        tag: int16 = 0x0 (2 bytes)
    //        payload: p9_qid {
    //          type: p9_qid_types = 0x80 (1 bytes)
    //          version: int32 = 0x0 (4 bytes)
    //          path: int64 = 0x0 (8 bytes)
    //        }
    //      }
    //    }
    //    size: bytesize = 0x14 (8 bytes)
    //  ]
    NONFAILING(*(uint32_t*)0x200000000080 = 0x14);
    NONFAILING(*(uint8_t*)0x200000000084 = 0x69);
    NONFAILING(*(uint16_t*)0x200000000085 = 0);
    NONFAILING(*(uint8_t*)0x200000000087 = 0x80);
    NONFAILING(*(uint32_t*)0x200000000088 = 0);
    NONFAILING(*(uint64_t*)0x20000000008c = 0);
    syscall(__NR_write, /*fd=*/r[1], /*data=*/0x200000000080ul,
            /*size=*/0x14ul);
    break;
  case 12:
    //  write$P9_RGETATTR arguments: [
    //    fd: wfd9p (resource)
    //    data: ptr[in, p9_msg[P9_RGETATTR, p9_rgetattr]] {
    //      p9_msg[P9_RGETATTR, p9_rgetattr] {
    //        size: bytesize = 0xa0 (4 bytes)
    //        type: const = 0x19 (1 bytes)
    //        tag: int16 = 0x0 (2 bytes)
    //        payload: p9_rgetattr {
    //          valid: p8_stats_valid = 0x2c9e (8 bytes)
    //          qid: p9_qid {
    //            type: p9_qid_types = 0x80 (1 bytes)
    //            version: int32 = 0x0 (4 bytes)
    //            path: int64 = 0x0 (8 bytes)
    //          }
    //          mode: open_mode = 0x41ed (4 bytes)
    //          uid: uid (resource)
    //          gid: gid (resource)
    //          nlink: int64 = 0x1 (8 bytes)
    //          rdev: int64 = 0x0 (8 bytes)
    //          size: int64 = 0x1000 (8 bytes)
    //          blksize: int64 = 0x7 (8 bytes)
    //          blocks: int64 = 0x8 (8 bytes)
    //          atime_sec: int64 = 0x0 (8 bytes)
    //          atime_nsec: int64 = 0x0 (8 bytes)
    //          mtime_sec: int64 = 0x0 (8 bytes)
    //          mtime_nsec: int64 = 0x0 (8 bytes)
    //          ctime_sec: int64 = 0x0 (8 bytes)
    //          ctime_nsec: int64 = 0x0 (8 bytes)
    //          btime_sec: int64 = 0xffffffffffffffff (8 bytes)
    //          btime_nsec: int64 = 0x1 (8 bytes)
    //          gen: int64 = 0x0 (8 bytes)
    //          data_version: int64 = 0x0 (8 bytes)
    //        }
    //      }
    //    }
    //    size: bytesize = 0xa0 (8 bytes)
    //  ]
    NONFAILING(*(uint32_t*)0x2000000000c0 = 0xa0);
    NONFAILING(*(uint8_t*)0x2000000000c4 = 0x19);
    NONFAILING(*(uint16_t*)0x2000000000c5 = 0);
    NONFAILING(*(uint64_t*)0x2000000000c7 = 0x2c9e);
    NONFAILING(*(uint8_t*)0x2000000000cf = 0x80);
    NONFAILING(*(uint32_t*)0x2000000000d0 = 0);
    NONFAILING(*(uint64_t*)0x2000000000d4 = 0);
    NONFAILING(*(uint32_t*)0x2000000000dc = 0x41ed);
    NONFAILING(*(uint32_t*)0x2000000000e0 = 0);
    NONFAILING(*(uint32_t*)0x2000000000e4 = 0);
    NONFAILING(*(uint64_t*)0x2000000000e8 = 1);
    NONFAILING(*(uint64_t*)0x2000000000f0 = 0);
    NONFAILING(*(uint64_t*)0x2000000000f8 = 0x1000);
    NONFAILING(*(uint64_t*)0x200000000100 = 7);
    NONFAILING(*(uint64_t*)0x200000000108 = 8);
    NONFAILING(*(uint64_t*)0x200000000110 = 0);
    NONFAILING(*(uint64_t*)0x200000000118 = 0);
    NONFAILING(*(uint64_t*)0x200000000120 = 0);
    NONFAILING(*(uint64_t*)0x200000000128 = 0);
    NONFAILING(*(uint64_t*)0x200000000130 = 0);
    NONFAILING(*(uint64_t*)0x200000000138 = 0);
    NONFAILING(*(uint64_t*)0x200000000140 = -1);
    NONFAILING(*(uint64_t*)0x200000000148 = 1);
    NONFAILING(*(uint64_t*)0x200000000150 = 0);
    NONFAILING(*(uint64_t*)0x200000000158 = 0);
    syscall(__NR_write, /*fd=*/r[1], /*data=*/0x2000000000c0ul,
            /*size=*/0xa0ul);
    break;
  }
}
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);
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}