// https://syzkaller.appspot.com/bug?id=b022d8974af08db5a9b84667d3e535e50704400e
// 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 <sched.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>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

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");
}

#define USLEEP_FORKED_CHILD (3 * 50 * 1000)

static long handle_clone_ret(long ret)
{
  if (ret != 0) {
    return ret;
  }
  usleep(USLEEP_FORKED_CHILD);
  syscall(__NR_exit, 0);
  while (1) {
  }
}

static long syz_clone(volatile long flags, volatile long stack,
                      volatile long stack_len, volatile long ptid,
                      volatile long ctid, volatile long tls)
{
  long sp = (stack + stack_len) & ~15;
  long ret = (long)syscall(__NR_clone, flags & ~CLONE_VM, sp, ptid, ctid, tls);
  return handle_clone_ret(ret);
}

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 < 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);
      if (call == 2)
        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[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    memcpy(
        (void*)0x20000280,
        "\001\375\256.+\246\214\266?2\0319\224S,|x?Ue[\275\341!\0033\274\'#"
        "\377\027\233%\363[d  "
        "\227\365G\227A\302\330\360Uq\346+\245l\224\v\266\a\027\\\373\004!"
        "\344\304\261\242\034\377C;\224Q\r\266}"
        "\234\354C\v\317\353\344\232R\345,"
        "\202\003\000\031\215\350\306\271\344\264\231\212\031P\270\214x\b\231"
        "\004R\005\257\242\3525\f\314\032\233\000Uf\245\367\200Tgiz\nX\b\221"
        "\3750\216\266\243\v#\241\337\264\300\346\264\357\250i\330\242\322("
        "\230\233A\217\023\353\364b/"
        "\357!\217\366]-"
        "\351k\2662\211gEv\023\364\307\262\365\\\027\220\265\246\250\270o\017"
        "\342 "
        "\347\234$\327\362@\367cdv[\t\000\215\363\3141\r$"
        "\036\377\360P\262\227\270\274\353\221\207\213u\277\324\'\377\037\f\001"
        "6\235Q\356T\350\bY\000\262\006\246\276l\233."
        "o\276\200\235x\325O\326h\\I\311\215\a\035\311\017\202\333s\307\203L"
        "\236\242\321\263\254\215\330\264\264\352\220Q\330\307\353%"
        "\213Op\032b\226\317\273\025\317\374N\355\000\000\000\000\000\000\000"
        "\000\000\000\000\000\000s\257\242\024]p+\226\036i|n\332\356\\\256\226*"
        "\202*"
        "\270j\332\252\024\037\035\370\370\256\374H\304\263j\350\317O\357\016"
        "\257e\265*"
        "\211\030\262w\226\b\033y\352T\335\263g6\274\205\262Y\314v\006\000\000"
        "\000\305e\220\3051\237\v_# "
        "\b\245\274P,|\351\326s\037\037\276\323\200\261\250 "
        "\316|df\2203\v\002\352.\003X\265\344,"
        "8\267\255EI\334A\247\314\327\371n\033\225\370\021Z\346:"
        "\003\316\376\002\214tdy~_oC\236\357\360\242K\351;\216:"
        "\001\003C\222\353\026\034\277\276\357\314Uxhg\377Y\346\203\246z\377"
        "\001\235 o_{!O\252jU\204 "
        "\351\2659r\234w\030Z\323\315\016\272\\\333\360\341\206\t\257\vi\334"
        "\277?\365\n\275^\005\300\316uC}\250\307\255\206\327\025&\271]"
        "1\005J\226\360\204\301\f\246p\226\270\002\023pA\031\tf\022\210\310\234"
        "\311Cn\324\2447V\'+\314\277\r\251\020\035\317\353Klb\345:"
        "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000G\337\273"
        "\300_\231F\364n]"
        "\024\274\315\323\237\237e\305\346\350Mb\306\202\202\314\312Xe\341\242"
        "\252\002\206\270\030\342C\353\251\027&\001&"
        "\'w\241t0\200\360\223\200\237\233\340\237\352\271\236D]#"
        "V\332\222\312\306\372."
        "\326\3431\376\350\002\353X\275\nz\001O\323r\242\251u\223",
        685);
    res = syscall(__NR_memfd_create, /*name=*/0x20000280ul, /*flags=*/6ul);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x4000ul, /*prot=*/0xeul,
            /*flags=*/0x12ul, /*fd=*/r[0], /*offset=*/0ul);
    break;
  case 2:
    syz_clone(/*flags=*/0, /*stack=*/0, /*stack_len=*/0, /*parentid=*/0,
              /*childtid=*/0, /*tls=*/0);
    break;
  case 3:
    *(uint64_t*)0x20000140 = 0;
    *(uint32_t*)0x20000148 = 0x25;
    *(uint32_t*)0x2000014c = 0;
    *(uint64_t*)0x20000150 = 0;
    *(uint64_t*)0x20000158 = 0;
    syscall(__NR_timer_create, /*id=*/5ul, /*ev=*/0x20000140ul,
            /*timerid=*/0ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}