// https://syzkaller.appspot.com/bug?id=993b0da2d863e7891c6daeb542e03dd1d37e2d0f
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <time.h>
#include <unistd.h>

#ifndef SYS_mknod
#define SYS_mknod 450
#endif
#ifndef SYS_mmap
#define SYS_mmap 197
#endif
#ifndef SYS_msgctl
#define SYS_msgctl 444
#endif
#ifndef SYS_open
#define SYS_open 5
#endif
#ifndef SYS_pipe
#define SYS_pipe 42
#endif
#ifndef SYS_sendmmsg
#define SYS_sendmmsg 476
#endif
#ifndef SYS_writev
#define SYS_writev 121
#endif

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 {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

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;
  for (call = 0; call < 9; 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);
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    syscall(SYS_sendmmsg, /*s=*/-1, /*mmsg=*/0ul, /*len=*/0ul, /*f=*/0ul,
            /*timeout=*/0ul);
    break;
  case 1:
    memcpy((void*)0x20000280, "./file0\000", 8);
    syscall(SYS_mknod, /*file=*/0x20000280ul, /*mode=S_IFCHR*/ 0x2000ul,
            /*dev=*/0x200ul);
    break;
  case 2:
    memcpy((void*)0x20000040, "./file0\000", 8);
    res = syscall(SYS_open, /*file=*/0x20000040ul,
                  /*flags=O_NOFOLLOW|O_TRUNC|O_CREAT|O_APPEND|0x6*/ 0x70eul,
                  /*mode=*/0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 3:
    syscall(SYS_mknod, /*file=*/0ul, /*mode=S_IFCHR*/ 0x2000ul,
            /*dev=*/0x1803ul);
    break;
  case 4:
    syscall(SYS_msgctl, /*msqid=*/0, /*cmd=*/2ul, /*buf=*/0ul);
    break;
  case 5:
    syscall(SYS_mknod, /*file=*/0ul, /*mode=S_IFCHR*/ 0x2000ul,
            /*dev=*/0x400ul);
    break;
  case 6:
    *(uint64_t*)0x200008c0 = 0x200007c0;
    memset((void*)0x200007c0, 67, 1);
    *(uint64_t*)0x200008c8 = 1;
    *(uint64_t*)0x200008d0 = 0x20000000;
    memcpy((void*)0x20000000,
           "\x9c\xf7\xa0\x82\x94\x9d\x63\x38\x92\xcc\xb0\xb9\xf0\xf8\x1b\x09"
           "\xd6\x2e\x36\xc8\xb5\xae\x14\x90\xce\xde\x3a\x53\x05\x40\x25\xf9"
           "\xa4\x39\x70\x9f\x39\xaa\xc5\x8d\x5c\x21\xad\x64\x76\x3a\x86\x48"
           "\x4d\xc6\x8a\xe7\x3a\xe8\x5c\x92\x17\x9e\xb4\x98\x01\xae\xa9\x2c",
           64);
    *(uint64_t*)0x200008d8 = 0xffffff46;
    syscall(SYS_writev, /*fd=*/r[0], /*vec=*/0x200008c0ul, /*vlen=*/2ul);
    break;
  case 7:
    syscall(SYS_sendmmsg, /*s=*/-1, /*mmsg=*/0ul, /*len=*/0ul, /*f=*/0ul,
            /*timeout=*/0ul);
    break;
  case 8:
    syscall(SYS_pipe, /*pipefd=*/0x20000400ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ*/ 3ul,
          /*flags=MAP_PRIVATE|MAP_FIXED|MAP_ANON*/ 0x1012ul, /*fd=*/-1,
          /*pad=*/0ul, /*offset=*/0ul);
  loop();
  return 0;
}