// https://syzkaller.appspot.com/bug?id=9f27e880d757d8e1b7bebd36a4c391fccb92f134
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if_arp.h>
#include <pthread.h>
#include <sched.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/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.h>

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);
  if (pthread_create(&th, &attr, fn, arg))
    exit(1);
  pthread_attr_destroy(&attr);
}

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);
}

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_RELAXED))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

static void vsnprintf_check(char* str, size_t size, const char* format,
                            va_list args)
{
  int rv;
  rv = vsnprintf(str, size, format, args);
  if (rv < 0)
    exit(1);
  if ((size_t)rv >= size)
    exit(1);
}

#define COMMAND_MAX_LEN 128
#define PATH_PREFIX                                                            \
  "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin "
#define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1)

static void execute_command(bool panic, const char* format, ...)
{
  va_list args;
  char command[PATH_PREFIX_LEN + COMMAND_MAX_LEN];
  int rv;
  va_start(args, format);
  memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN);
  vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args);
  va_end(args);
  rv = system(command);
  if (rv) {
    if (panic)
      exit(1);
  }
}

#define DEV_IPV4 "172.20.20.%d"
#define DEV_IPV6 "fe80::%02hx"
#define DEV_MAC "aa:aa:aa:aa:aa:%02hx"

static void snprintf_check(char* str, size_t size, const char* format, ...)
{
  va_list args;
  va_start(args, format);
  vsnprintf_check(str, size, format, args);
  va_end(args);
}
static void initialize_netdevices(void)
{
  unsigned i;
  const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "team"};
  const char* devnames[] = {"lo",
                            "sit0",
                            "bridge0",
                            "vcan0",
                            "tunl0",
                            "gre0",
                            "gretap0",
                            "ip_vti0",
                            "ip6_vti0",
                            "ip6tnl0",
                            "ip6gre0",
                            "ip6gretap0",
                            "erspan0",
                            "bond0",
                            "veth0",
                            "veth1",
                            "team0",
                            "veth0_to_bridge",
                            "veth1_to_bridge",
                            "veth0_to_bond",
                            "veth1_to_bond",
                            "veth0_to_team",
                            "veth1_to_team"};
  const char* devmasters[] = {"bridge", "bond", "team"};
  for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++)
    execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]);
  execute_command(0, "ip link add type veth");
  for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
    execute_command(
        0, "ip link add name %s_slave_0 type veth peer name veth0_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(
        0, "ip link add name %s_slave_1 type veth peer name veth1_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(0, "ip link set %s_slave_0 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set %s_slave_1 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set veth0_to_%s up", devmasters[i]);
    execute_command(0, "ip link set veth1_to_%s up", devmasters[i]);
  }
  execute_command(0, "ip link set bridge_slave_0 up");
  execute_command(0, "ip link set bridge_slave_1 up");
  for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) {
    char addr[32];
    snprintf_check(addr, sizeof(addr), DEV_IPV4, i + 10);
    execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_IPV6, i + 10);
    execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_MAC, i + 10);
    execute_command(0, "ip link set dev %s address %s", devnames[i], addr);
    execute_command(0, "ip link set dev %s up", devnames[i]);
  }
}

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

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();
  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 = 0;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

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

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  initialize_netdevices();
  loop();
  exit(1);
}

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 loop(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 9; 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);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0xa, 6, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint16_t*)0x20000000 = 0xa;
    *(uint16_t*)0x20000002 = htobe16(0x4e20);
    *(uint32_t*)0x20000004 = 0;
    *(uint8_t*)0x20000008 = 0;
    *(uint8_t*)0x20000009 = 0;
    *(uint8_t*)0x2000000a = 0;
    *(uint8_t*)0x2000000b = 0;
    *(uint8_t*)0x2000000c = 0;
    *(uint8_t*)0x2000000d = 0;
    *(uint8_t*)0x2000000e = 0;
    *(uint8_t*)0x2000000f = 0;
    *(uint8_t*)0x20000010 = 0;
    *(uint8_t*)0x20000011 = 0;
    *(uint8_t*)0x20000012 = 0;
    *(uint8_t*)0x20000013 = 0;
    *(uint8_t*)0x20000014 = 0;
    *(uint8_t*)0x20000015 = 0;
    *(uint8_t*)0x20000016 = 0;
    *(uint8_t*)0x20000017 = 0;
    *(uint32_t*)0x20000018 = 0;
    syscall(__NR_bind, r[0], 0x20000000, 0x1c);
    break;
  case 2:
    res = syscall(__NR_socket, 2, 6, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 3:
    syscall(__NR_listen, r[0], 6);
    break;
  case 4:
    memcpy((void*)0x201c9fff, "\x03", 1);
    syscall(__NR_setsockopt, r[1], 0x10d, 0xd, 0x201c9fff, 1);
    break;
  case 5:
    *(uint16_t*)0x20e5c000 = 2;
    *(uint16_t*)0x20e5c002 = htobe16(0x4e20);
    *(uint8_t*)0x20e5c004 = 0xac;
    *(uint8_t*)0x20e5c005 = 0x14;
    *(uint8_t*)0x20e5c006 = 0x14;
    *(uint8_t*)0x20e5c007 = 0x20;
    *(uint8_t*)0x20e5c008 = 0;
    *(uint8_t*)0x20e5c009 = 0;
    *(uint8_t*)0x20e5c00a = 0;
    *(uint8_t*)0x20e5c00b = 0;
    *(uint8_t*)0x20e5c00c = 0;
    *(uint8_t*)0x20e5c00d = 0;
    *(uint8_t*)0x20e5c00e = 0;
    *(uint8_t*)0x20e5c00f = 0;
    syscall(__NR_connect, r[1], 0x20e5c000, 0x10);
    break;
  case 6:
    *(uint32_t*)0x20000080 = 0;
    res = syscall(__NR_accept, r[0], 0, 0x20000080);
    if (res != -1)
      r[2] = res;
    break;
  case 7:
    *(uint64_t*)0x200037c0 = 0;
    *(uint32_t*)0x200037c8 = 0;
    *(uint64_t*)0x200037d0 = 0x20000480;
    *(uint64_t*)0x20000480 = 0x20001640;
    memcpy((void*)0x20001640, "\x08\xdd\x33\x5c\xe9\x12\xf2\xd5\xc8\x98\x21\xfd"
                              "\x1c\x9a\xef\xcd\x59\xb4\xa0\x77\x4b\x04\xaa\xd2"
                              "\xd2\x99\xb8\x10\x2d\x6f\xeb\x66\xfd\x0a\xb8\xbe"
                              "\x7e\xdc\x90\xe8\x3a\x17\x44\x97\x13\x70\x1e\xcf"
                              "\x0c\xce\xcb\xcd\xea\x8c\x0a\x67\xd8\x07\x23\x0b"
                              "\x18\xc6\xfa\xc8\x74\x8e\x2a\xeb\x66\x33\x4b\x08"
                              "\x21\x88\x0c\x51\x34\x44\x8a\xa1\xd3\xac\x1e",
           83);
    *(uint64_t*)0x20000488 = 0x53;
    *(uint64_t*)0x200037d8 = 1;
    *(uint64_t*)0x200037e0 = 0x200016c0;
    *(uint64_t*)0x200016c0 = 0x10;
    *(uint32_t*)0x200016c8 = 0x17;
    *(uint32_t*)0x200016cc = 0;
    *(uint64_t*)0x200037e8 = 0x10;
    *(uint32_t*)0x200037f0 = 1;
    *(uint32_t*)0x200037f8 = 0xffff;
    *(uint64_t*)0x20003800 = 0;
    *(uint32_t*)0x20003808 = 0;
    *(uint64_t*)0x20003810 = 0x20001e40;
    *(uint64_t*)0x20001e40 = 0x20001dc0;
    memcpy((void*)0x20001dc0,
           "\xa6\xc9\xee\x46\xf1\xb8\x7e\x24\x0b\x32\x1f\xe3\xbb\x37\x53\x8f"
           "\xf4\xe9\x7d\x5a\x35\x9c\x58\x7b\x31\x19\xfd\xd9\xd1\x85\xfc\x65"
           "\x56\xe0\xd8\x21\x73\x18\x89\x7c\x24\x69\x71\x3d\x30\x12\x96\xbe"
           "\x33\xe4\xbd\xca\x1b\x92\xbe\x68\xb5\xca\x8b\xbe\x69\x44\xaf\x08"
           "\x45\x8a\xfd\x6f\x14\x41\x55\x88\xa9\xae\xbb\x62\x68\x82\x4a\x5e"
           "\x11\xe3\xf2\x35\x3a\x4e\x39\x45\xae\x7f\xb6\x44\x52\x3e\x18\x5b"
           "\xe5\x02\x4c\x3f\x3f\xfa\x7b\xd7\x4f\x8b\x31\x24\x68\x22\x55\xd1"
           "\x59\x3e\x4f\x2d\xc6",
           117);
    *(uint64_t*)0x20001e48 = 0x75;
    *(uint64_t*)0x20003818 = 1;
    *(uint64_t*)0x20003820 = 0x20001e80;
    *(uint64_t*)0x20003828 = 0;
    *(uint32_t*)0x20003830 = 4;
    *(uint32_t*)0x20003838 = 7;
    *(uint64_t*)0x20003840 = 0x20002540;
    *(uint16_t*)0x20002540 = 0xa;
    *(uint16_t*)0x20002542 = htobe16(0x4e20);
    *(uint32_t*)0x20002544 = 1;
    *(uint8_t*)0x20002548 = 0xfe;
    *(uint8_t*)0x20002549 = 0x80;
    *(uint8_t*)0x2000254a = 0;
    *(uint8_t*)0x2000254b = 0;
    *(uint8_t*)0x2000254c = 0;
    *(uint8_t*)0x2000254d = 0;
    *(uint8_t*)0x2000254e = 0;
    *(uint8_t*)0x2000254f = 0;
    *(uint8_t*)0x20002550 = 0;
    *(uint8_t*)0x20002551 = 0;
    *(uint8_t*)0x20002552 = 0;
    *(uint8_t*)0x20002553 = 0;
    *(uint8_t*)0x20002554 = 0;
    *(uint8_t*)0x20002555 = 0;
    *(uint8_t*)0x20002556 = 0;
    *(uint8_t*)0x20002557 = 0xaa;
    *(uint32_t*)0x20002558 = 0x3d;
    *(uint32_t*)0x20003848 = 0x80;
    *(uint64_t*)0x20003850 = 0x20003780;
    *(uint64_t*)0x20003780 = 0x200036c0;
    *(uint64_t*)0x20003788 = 0;
    *(uint64_t*)0x20003858 = 1;
    *(uint64_t*)0x20003860 = 0x20003980;
    *(uint64_t*)0x20003868 = 0;
    *(uint32_t*)0x20003870 = 0;
    *(uint32_t*)0x20003878 = -1;
    syscall(__NR_sendmmsg, r[2], 0x200037c0, 3, 0x80);
    break;
  case 8:
    *(uint64_t*)0x20005700 = 0x20003900;
    *(uint16_t*)0x20003900 = 0x18;
    *(uint32_t*)0x20003902 = 2;
    *(uint16_t*)0x20003906 = htobe16(0);
    *(uint32_t*)0x2000390a = htobe32(0);
    *(uint32_t*)0x20005708 = 0x80;
    *(uint64_t*)0x20005710 = 0x20003b80;
    *(uint64_t*)0x20005718 = 0x3a5;
    *(uint64_t*)0x20005720 = 0x20003bc0;
    *(uint64_t*)0x20005728 = 0;
    *(uint32_t*)0x20005730 = 0;
    *(uint32_t*)0x20005738 = 0;
    syscall(__NR_sendmmsg, r[1], 0x20005700, 0x3a6, 0);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  do_sandbox_none();
  return 0;
}