// https://syzkaller.appspot.com/bug?id=0ea9a643d92c10f70992837a06fa41df5bd0411e
// 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 <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 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;
}

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 < 4; 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[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  socket$inet arguments: [
    //    domain: const = 0x2 (8 bytes)
    //    type: socket_type = 0x4000000000000001 (8 bytes)
    //    proto: int32 = 0x0 (4 bytes)
    //  ]
    //  returns sock_in
    res = syscall(__NR_socket, /*domain=*/2ul,
                  /*type=SOCK_STREAM|0x4000000000000000*/ 0x4000000000000001ul,
                  /*proto=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    //  sendto$inet arguments: [
    //    fd: sock_in (resource)
    //    buf: nil
    //    len: len = 0x0 (8 bytes)
    //    f: send_flags = 0x200007fd (8 bytes)
    //    addr: ptr[in, sockaddr_in] {
    //      sockaddr_in {
    //        family: const = 0x2 (2 bytes)
    //        port: int16be = 0x4e23 (2 bytes)
    //        addr: union ipv4_addr {
    //          local: ipv4_addr_t[const[170, int8]] {
    //            a0: const = 0xac (1 bytes)
    //            a1: const = 0x14 (1 bytes)
    //            a2: const = 0x14 (1 bytes)
    //            a3: const = 0xaa (1 bytes)
    //          }
    //        }
    //        pad = 0x0 (8 bytes)
    //      }
    //    }
    //    addrlen: len = 0x10 (8 bytes)
    //  ]
    *(uint16_t*)0x200000e68000 = 2;
    *(uint16_t*)0x200000e68002 = htobe16(0x4e23);
    *(uint8_t*)0x200000e68004 = 0xac;
    *(uint8_t*)0x200000e68005 = 0x14;
    *(uint8_t*)0x200000e68006 = 0x14;
    *(uint8_t*)0x200000e68007 = 0xaa;
    syscall(
        __NR_sendto, /*fd=*/r[0], /*buf=*/0ul, /*len=*/0ul,
        /*f=MSG_FASTOPEN|MSG_PROBE|MSG_OOB|MSG_EOR|MSG_DONTWAIT|MSG_DONTROUTE|0x728*/
        0x200007fdul, /*addr=*/0x200000e68000ul, /*addrlen=*/0x10ul);
    break;
  case 2:
    //  socket$nl_netfilter arguments: [
    //    domain: const = 0x10 (8 bytes)
    //    type: const = 0x3 (8 bytes)
    //    proto: const = 0xc (4 bytes)
    //  ]
    //  returns sock_nl_netfilter
    res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0xc);
    if (res != -1)
      r[1] = res;
    break;
  case 3:
    //  sendmsg$NFT_BATCH arguments: [
    //    fd: sock_nl_netfilter (resource)
    //    msg: ptr[in, msghdr_netlink[nft_batch_msg]] {
    //      msghdr_netlink[nft_batch_msg] {
    //        addr: nil
    //        addrlen: len = 0x0 (4 bytes)
    //        pad = 0x0 (4 bytes)
    //        vec: ptr[in, iovec[in, nft_batch_msg]] {
    //          iovec[in, nft_batch_msg] {
    //            addr: ptr[inout, array[ANYUNION]] {
    //              array[ANYUNION] {
    //                union ANYUNION {
    //                  ANYBLOB: buffer: {14 00 00 00 10 00 01 00 00 00 00 00 00
    //                  00 00 00 02 00 00 0a 20 00 00 00 00 0a 01 04 00 00 00 00
    //                  00 00 00 00 02 00 00 00 09 00 01 00 73 79 7a 30 00 00 00
    //                  00 40 00 00 00 03 0a 01 04 00 00 00 00 00 00 00 00 02 00
    //                  00 00 09 00 01 00 73 79 7a 30 00 00 00 00 09 00 03 00 73
    //                  79 7a 31 00 00 00 00 14 00 04 00 08 00 01 00 00 00 00 01
    //                  08 00 02 00 00 00 00 00 50 00 00 00 12 0a 01 04 00 00 00
    //                  00 00 00 00 00 02 00 00 00 09 00 01 00 73 79 7a 30 00 00
    //                  00 00 09 00 02 00 73 79 7a 30 00 00 00 00 08 00 03 00 00
    //                  00 00 0a 1c 00 04 00 06 00 01 00 05 b4 00 00 05 00 02 00
    //                  07 00 00 00 08 00 03 00 00 00 00 03 58 00 00 00 06 0a 01
    //                  04 00 00 00 00 00 00 00 00 02 00 00 00 09 00 01 00 73 79
    //                  7a 30 00 00 00 00 09 00 02 00 73 79 7a 31 00 00 00 00 2c
    //                  00 04 00 28 00 01 00 0b 00 01 00 6f 62 6a 72 65 66 00 00
    //                  18 00 02 00 08 00 01 00 00 00 00 0a 09 00 02 00 73 79 7a
    //                  30 00 00 00 00 14 00 00 00 11 00 01 00 00 00 00 00 00 00
    //                  00 00 02 00 00 0a} (length 0x130)
    //                }
    //              }
    //            }
    //            len: len = 0x130 (8 bytes)
    //          }
    //        }
    //        vlen: const = 0x1 (8 bytes)
    //        ctrl: const = 0x0 (8 bytes)
    //        ctrllen: const = 0x0 (8 bytes)
    //        f: send_flags = 0x0 (4 bytes)
    //        pad = 0x0 (4 bytes)
    //      }
    //    }
    //    f: send_flags = 0x0 (8 bytes)
    //  ]
    *(uint64_t*)0x2000000000c0 = 0;
    *(uint32_t*)0x2000000000c8 = 0;
    *(uint64_t*)0x2000000000d0 = 0x200000000040;
    *(uint64_t*)0x200000000040 = 0x200000000200;
    memcpy(
        (void*)0x200000000200,
        "\x14\x00\x00\x00\x10\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02"
        "\x00\x00\x0a\x20\x00\x00\x00\x00\x0a\x01\x04\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x02\x00\x00\x00\x09\x00\x01\x00\x73\x79\x7a\x30\x00\x00\x00"
        "\x00\x40\x00\x00\x00\x03\x0a\x01\x04\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x02\x00\x00\x00\x09\x00\x01\x00\x73\x79\x7a\x30\x00\x00\x00\x00\x09"
        "\x00\x03\x00\x73\x79\x7a\x31\x00\x00\x00\x00\x14\x00\x04\x00\x08\x00"
        "\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x50\x00\x00"
        "\x00\x12\x0a\x01\x04\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00"
        "\x09\x00\x01\x00\x73\x79\x7a\x30\x00\x00\x00\x00\x09\x00\x02\x00\x73"
        "\x79\x7a\x30\x00\x00\x00\x00\x08\x00\x03\x00\x00\x00\x00\x0a\x1c\x00"
        "\x04\x00\x06\x00\x01\x00\x05\xb4\x00\x00\x05\x00\x02\x00\x07\x00\x00"
        "\x00\x08\x00\x03\x00\x00\x00\x00\x03\x58\x00\x00\x00\x06\x0a\x01\x04"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x09\x00\x01\x00\x73"
        "\x79\x7a\x30\x00\x00\x00\x00\x09\x00\x02\x00\x73\x79\x7a\x31\x00\x00"
        "\x00\x00\x2c\x00\x04\x00\x28\x00\x01\x00\x0b\x00\x01\x00\x6f\x62\x6a"
        "\x72\x65\x66\x00\x00\x18\x00\x02\x00\x08\x00\x01\x00\x00\x00\x00\x0a"
        "\x09\x00\x02\x00\x73\x79\x7a\x30\x00\x00\x00\x00\x14\x00\x00\x00\x11"
        "\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x0a",
        304);
    *(uint64_t*)0x200000000048 = 0x130;
    *(uint64_t*)0x2000000000d8 = 1;
    *(uint64_t*)0x2000000000e0 = 0;
    *(uint64_t*)0x2000000000e8 = 0;
    *(uint32_t*)0x2000000000f0 = 0;
    syscall(__NR_sendmsg, /*fd=*/r[1], /*msg=*/0x2000000000c0ul, /*f=*/0ul);
    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;
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}