// https://syzkaller.appspot.com/bug?id=4aeceeb1204dfc6707f976a7a702e18b773b26f6
// 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/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 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)
{
  int i, call, thread;
  for (call = 0; call < 5; 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 (call == 3)
        break;
      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 (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      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:
    res = syscall(__NR_socketpair, 0x1eul, 1ul, 0, 0x20000140ul);
    if (res != -1) {
      r[0] = *(uint32_t*)0x20000140;
      r[1] = *(uint32_t*)0x20000144;
    }
    break;
  case 1:
    *(uint64_t*)0x20000480 = 0;
    *(uint32_t*)0x20000488 = 0;
    *(uint64_t*)0x20000490 = 0x20000380;
    *(uint64_t*)0x20000498 = 0x10000023;
    *(uint64_t*)0x200004a0 = 0x200002c0;
    *(uint64_t*)0x200004a8 = 0x42e;
    *(uint32_t*)0x200004b0 = 0;
    syscall(__NR_recvmsg, -1, 0x20000480ul, 0ul, 0);
    break;
  case 2:
    *(uint64_t*)0x200001c0 = 0;
    *(uint32_t*)0x200001c8 = 0x17;
    *(uint64_t*)0x200001d0 = 0x20000400;
    *(uint64_t*)0x20000400 = 0x20000340;
    memcpy(
        (void*)0x20000340,
        "\x4f\x15\xa3\x9a\x2d\xf4\x3b\x14\xed\x5f\x2c\x57\x8d\x4d\xb0\x55\xee"
        "\x07\xf5\xa3\xd8\x02\xcf\x8b\x50\xb4\xe7\xdf\x21\xe1\x8c\xb5\xfc\x59"
        "\x56\x9f\x9e\x04\x8c\x63\x43\xd4\xd9\x3a\x8d\xe6\x16\x54\xae\xa6\x0f"
        "\x37\xd0\x07\x26\xbb\xba\xf8\x41\x3f\xa3\x5f\x71\x1e\x8e\xbd\x6b\x86"
        "\xb0\xd0\x49\xac\x43\xde\x63\xad\x10\xd2\x51\xb4\xfd\xb1\x4d\x20\x70"
        "\x6d\x04\x2b\x10\x38\x4f\xce\x5e\xc5\x62\xf8\x0e\xea\x29\x46\xc9\xcf"
        "\xc7\xf1\x07\x83\x25\x73\x25\x82\xaf\x6d\xa3\x54\x42\xdf\xad\xaa\xcf"
        "\x63\x64\x3c\x41\xa7\xe5\xf8\x82\xe0\x90\x16\xd4\x6b\x27\x73\x97\x51"
        "\xf7\xcb\x3c\x97\x47\xd0\x87\x91\x9a\x9c\xe3\xb1\x3b\x0c\x9a\x27\x74"
        "\xa5\x4d\x8d\x5a\x2c\x50\x53\xac\x2e\xeb\xb1\x4c\xad",
        166);
    *(uint64_t*)0x20000408 = 0;
    *(uint64_t*)0x20000410 = 0x20000240;
    memcpy(
        (void*)0x20000240,
        "\xae\x61\xa8\xd1\x92\x17\x14\x09\xdc\x2c\x19\x80\x9c\xe7\x0f\x90\xc6"
        "\x1b\x40\x2d\x89\x90\x6f\x87\x6f\xbb\x89\x19\x6f\xa5\x7c\x9d\xd7\xed"
        "\x6f\xe7\x3d\x4a\x9a\x05\x0d\x32\x41\x6a\x7e\x62\x2c\x1c\x99\x43\xab"
        "\x04\xd4\xe7\xdb\x15\x46\xfa\xb9\x43\xd9\x5d\x0a\x70\x57\x45\x9e\x2d"
        "\x58\xc8\x3e\x7f\x97\xdd\xda\x17\xb3\xaf\xf6\x7e\xfc\x92\xf8\x73\xb9"
        "\x0a\x00\xb5\xd3\xc8\x22\x63\x57\xfc\x7d\xce\x76\xf9\xcc\xb0\xc7\x57"
        "\xe1\xf3\xf3\xd7\x7a\xb2\xc3\x82\xb1\xf4\x74\xdb\xfc\x9f",
        116);
    *(uint64_t*)0x20000418 = 0;
    *(uint64_t*)0x200001d8 = 0x47;
    *(uint64_t*)0x200001e0 = 0x20000000;
    *(uint64_t*)0x200001e8 = 0;
    *(uint32_t*)0x200001f0 = 0xb9efff7f;
    syscall(__NR_sendmsg, r[1], 0x200001c0ul, 0ul);
    break;
  case 3:
    *(uint64_t*)0x20000200 = 0x20000040;
    *(uint32_t*)0x20000208 = 0xfe76;
    *(uint64_t*)0x20000210 = 0x20000000;
    *(uint64_t*)0x20000000 = 0x20000080;
    *(uint64_t*)0x20000008 = 0x2644e0;
    *(uint64_t*)0x20000218 = 1;
    *(uint64_t*)0x20000220 = 0x200001c0;
    *(uint64_t*)0x20000228 = 0x10080;
    *(uint32_t*)0x20000230 = 0x7301;
    syscall(__NR_recvmsg, r[0], 0x20000200ul, 0x3f9cul, 0);
    break;
  case 4:
    *(uint64_t*)0x200001c0 = 0;
    *(uint32_t*)0x200001c8 = 0;
    *(uint64_t*)0x200001d0 = 0;
    *(uint64_t*)0x200001d8 = 0;
    *(uint64_t*)0x200001e0 = 0;
    *(uint64_t*)0x200001e8 = 0;
    *(uint32_t*)0x200001f0 = 0xb9efff7f;
    syscall(__NR_sendmsg, r[1], 0x200001c0ul, 0ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  loop();
  return 0;
}