// https://syzkaller.appspot.com/bug?id=18436790c9573cf80e76a8676879ba155f67b89d
// 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;
  for (i = 0; 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);
  int i;
  for (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 < 11; 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, 45);
      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;
  for (iter = 0;; 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 < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

#ifndef __NR_execveat
#define __NR_execveat 322
#endif
#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

uint64_t r[3] = {0x0, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    res = syscall(__NR_gettid);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    syscall(__NR_clone, 0x200ul, 0ul, 0x9999999999999999ul, 0ul, -1ul);
    break;
  case 2:
    memcpy(
        (void*)0x20000780,
        "\227&\211\\\320\347\312\026ZO\224:\341\001\345`iq@Nse;\250Fpj\016\004!"
        "\325\305YBz\224\257\023\351\322\017\302G\206\006\000\361/"
        "V\214\354R\262\033\231vS\246K&"
        "u\235X\314\r\022\001\000\000\200\000\000\000\000E\241\370\344~"
        "IS\301\004\3678\361\'\337v\220\274\321\332\210j\026\353>"
        "\257\375j\203nj\312G\n\345j\233}\306G\206\262\336Y\027yX "
        "$\374U\235\200dX\314\253\204\321\001_\177\364tW."
        "\201\n\363\v\215\022pa\221\233\214xd\006\247k\n\206\303\266\2210\362L"
        "\360\257\341jd\332\037\213Vrd\244\2634\374Uj\032d:#"
        "\226\371\323\034\334\250\3230HX\351\t\030)"
        "\317\032m\325\340\333\334\327\216\340\243\202\354\233\373\311\201\234"
        "\334\267\017\335\323\327\276\211m3\035\034@"
        "\216u\205\316\257\246\226\242\023\037-\b\3171J\331\023Q\224R/"
        "\337\036\236\3457\332{\341D+\3635\313H\346\017\340]"
        "\357\213\315k\376\366\314+rp\325\b~\366\242\207\355<\302bO\210\003n% "
        "\000\000\000\000\231\335\200\003\354@\237\216lx\b\361\264^"
        "X\231\273\240\365Bx\251cT\f\231\277\265\353j.t\242\256M\234\024_"
        "\031\341\340H\026\355i:"
        "\000\000\000\000\000\000\000\000\312\227\272\362\033\353\245h\353\260"
        "\300xe\243\022\313\347\330\242nBP\257("
        "\260\212\333\242M\361\204\005\214K\213\223\351\237\366\375\2649|"
        "\261\033F\toBx\326\255\375F\3568\312\225|"
        "\342\204\021\034\201M\a\004\326\321\3554\310\202\362C\3661\223X8\231M"
        "\361B\254\327\307\035\217\262\200\364\032\n\345\216\200x^k\374\n\331?"
        "g\242\177!\337,\177\242\2443\323h\375\347\033\0248\0311M\364O\321%"
        "\2455\237[CBF\000T\360\337\341\375K2("
        "cy\030K\357\376\353\337\311cX\364\371\221._\233%\032["
        "\251ql\031\361\233YF\036\220\'\345\322\031\f&{\333\335\357\304j\364@"
        "\213c\354(\267\333\205\243v&;\257\331\355$\237\0330\255|\267&"
        "\273\315\256\205\034\2065\267\324_r\361",
        574);
    res = syscall(__NR_memfd_create, 0x20000780ul, 0ul);
    if (res != -1)
      r[1] = res;
    break;
  case 3:
    syscall(__NR_fcntl, r[1], 0x400ul, 1ul);
    break;
  case 4:
    syscall(__NR_fcntl, r[1], 8ul, 0);
    break;
  case 5:
    memcpy((void*)0x20000500, "\000", 1);
    syscall(__NR_execveat, r[1], 0x20000500ul, 0ul, 0ul, 0x1000ul);
    break;
  case 6:
    memcpy((void*)0x200000c0, "./file0\000", 8);
    syscall(__NR_execve, 0x200000c0ul, 0ul, 0ul);
    break;
  case 7:
    memcpy((void*)0x20000100, "./file0\000", 8);
    res = syscall(__NR_creat, 0x20000100ul, 0x20005dul);
    if (res != -1)
      r[2] = res;
    break;
  case 8:
    memcpy((void*)0x200011c0,
           "\x7f\x45\x4c\x46\xf8\x7f\x00\x07\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x02\x00\x06\x00\xca\x3f\x8b\xca\x00\x00\x00\x00\x38\x00\x00\x00"
           "\x00\xff\x00\xf7\xff\xff\x1b\x00\x00\x00\x20\x00\x02\x00\x00\x00"
           "\x00\x00\x00\x00\xb5\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x7f\x04\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00"
           "\xe4\xcc\xdd\xae\xbf\x9b\xee\xdf\xd8\x70\x71\x46\x00\x00\x00\x31"
           "\x0f\xf3\x0c\x08\x53\x55\x2e\x30\xf5\x62\x02\x00\x2c\x95\x72\x3f"
           "\x06\x8f\xe4\x2d\x00\x00\xf2\xff",
           120);
    syscall(__NR_write, r[2], 0x200011c0ul, 0x78ul);
    break;
  case 9:
    syscall(__NR_close, r[2]);
    break;
  case 10:
    syscall(__NR_tkill, r[0], 0x16);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0ul);
  loop();
  return 0;
}