// 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 < 10; 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*)0x200004c0 = 0x20000200;
    *(uint16_t*)0x20000200 = 0x10;
    *(uint16_t*)0x20000202 = 0;
    *(uint32_t*)0x20000204 = 0;
    *(uint32_t*)0x20000208 = 0x20000000;
    *(uint32_t*)0x200004c8 = 0xc;
    *(uint64_t*)0x200004d0 = 0x20000480;
    *(uint64_t*)0x20000480 = 0x20000780;
    *(uint64_t*)0x20000488 = 1;
    *(uint64_t*)0x200004d8 = 1;
    *(uint64_t*)0x200004e0 = 0;
    *(uint64_t*)0x200004e8 = 0;
    *(uint32_t*)0x200004f0 = 0x4000810;
    syscall(__NR_sendmsg, r[2], 0x200004c0, 0x800);
    break;
  case 8:
    memcpy((void*)0x20000900,
           "\x64\xb2\x65\x92\xea\x4e\xbf\xd6\x58\xe5\x1f\x2c\x31\xdb\xf0\xb8"
           "\x11\x8e\xac\x64\x03\x5f\x27\xab\x88\xcb\x47\x66\xc0\x6c\xa2\x98"
           "\xbd\x8e\xf9\x4e\xe8\x1c\xaf\x02\xda\x55\x7d\xc3\xad\x19\x98\x4e"
           "\x53\x27\x39\xa0\xf3\x9c\x26\xa2\xbd\x7b\x7d\x63\x1e\xd2\x84\x09"
           "\x1a\x24\xb3\x9d\x92\xef\x66\xc8\xed\x92\x55\x3e\x9f\xde\xb7\x7f"
           "\x88\x0b\x37\xf1\x36\xf6\xad\x7d\x04\x67\x97\x0e\x84\xf8\x9f\xd7"
           "\x43\x46\x51\xc5\xd2\x96\xfa\x2b",
           104);
    syscall(__NR_sendto, r[2], 0x20000900, 0x68, 0x4000000, 0, 0);
    break;
  case 9:
    *(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;
}