// https://syzkaller.appspot.com/bug?id=eacb006878e13eb9f41f1f570454629d15705328
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

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

unsigned long long procid;

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

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 {
  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 execute_one(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 22; 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 (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      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 SYS__lwp_unpark_all
#define SYS__lwp_unpark_all 322
#endif
#ifndef SYS_connect
#define SYS_connect 98
#endif
#ifndef SYS_fcntl
#define SYS_fcntl 92
#endif
#ifndef SYS_flock
#define SYS_flock 131
#endif
#ifndef SYS_getsockname
#define SYS_getsockname 32
#endif
#ifndef SYS_getsockopt
#define SYS_getsockopt 118
#endif
#ifndef SYS_lchown
#define SYS_lchown 275
#endif
#ifndef SYS_mknod
#define SYS_mknod 450
#endif
#ifndef SYS_mmap
#define SYS_mmap 197
#endif
#ifndef SYS_open
#define SYS_open 5
#endif
#ifndef SYS_recvmsg
#define SYS_recvmsg 27
#endif
#ifndef SYS_rename
#define SYS_rename 128
#endif
#ifndef SYS_semctl
#define SYS_semctl 442
#endif
#ifndef SYS_shmat
#define SYS_shmat 228
#endif
#ifndef SYS_shmdt
#define SYS_shmdt 230
#endif
#ifndef SYS_shmget
#define SYS_shmget 231
#endif
#ifndef SYS_socket
#define SYS_socket 394
#endif
#ifndef SYS_socketpair
#define SYS_socketpair 135
#endif
#ifndef SYS_writev
#define SYS_writev 121
#endif

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

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    syscall(SYS_socketpair, 0x1ful, 3ul, 0xa7, 0x20000000ul);
    break;
  case 1:
    res = syscall(SYS_socket, 2ul, 0ul, 7);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    *(uint64_t*)0x20000280 = 0x20000080;
    *(uint32_t*)0x20000288 = 0xc;
    *(uint64_t*)0x20000290 = 0;
    *(uint64_t*)0x20000298 = 0;
    *(uint64_t*)0x200002a0 = 0x200001c0;
    *(uint64_t*)0x200002a8 = 0xa3;
    *(uint32_t*)0x200002b0 = 0;
    syscall(SYS_recvmsg, r[0], 0x20000280ul, 0xc00ul);
    break;
  case 3:
    syscall(SYS_shmdt, 0ul);
    break;
  case 4:
    res = syscall(SYS_shmget, 0ul, 0x4000ul, 0x20ful, 0x20ffc000ul);
    if (res != -1)
      r[1] = res;
    break;
  case 5:
    syscall(SYS_socketpair, 0x10ul, 0ul, 3, 0ul);
    break;
  case 6:
    *(uint64_t*)0x200004c0 = 0;
    *(uint64_t*)0x200004c8 = 0;
    *(uint64_t*)0x200004d0 = 0x200003c0;
    *(uint64_t*)0x200004d8 = 0;
    syscall(SYS_writev, -1, 0x200004c0ul, 2ul);
    break;
  case 7:
    syscall(SYS_getsockname, -1, 0x20000500ul, 0ul);
    break;
  case 8:
    syscall(SYS_shmat, r[1], 0x20ffa000ul, 0ul);
    break;
  case 9:
    syscall(SYS_getsockopt, r[0], 0xfffful, 0x11ul, 0ul, 0ul);
    break;
  case 10:
    memcpy((void*)0x20000600, "./file0\000", 8);
    syscall(SYS_lchown, 0x20000600ul, 0, 0);
    break;
  case 11:
    *(uint16_t*)0x200006c0 = 1;
    memcpy((void*)0x200006c2, "./file0\000", 8);
    syscall(SYS_connect, -1, 0x200006c0ul, 0xaul);
    break;
  case 12:
    syscall(SYS_semctl, 0, 0ul, 6ul, 0x20000700ul);
    break;
  case 13:
    *(uint64_t*)0x20000780 = 6;
    syscall(SYS__lwp_unpark_all, 0x20000740ul, 0ul, 0x20000780ul);
    break;
  case 14:
    syscall(SYS_fcntl, -1, 4ul, 4ul);
    break;
  case 15:
    syscall(SYS_flock, -1, 8ul);
    break;
  case 16:
    res = syscall(SYS_shmat, -1, 0x20fee000ul, 0x1000ul);
    if (res != -1)
      r[2] = res;
    break;
  case 17:
    syscall(SYS_shmdt, r[2]);
    break;
  case 18:
    syscall(SYS_socket, 2ul, 1ul, 8);
    break;
  case 19:
    memcpy((void*)0x20000800, "./file0\000", 8);
    memcpy((void*)0x20000840, "./file0\000", 8);
    syscall(SYS_rename, 0x20000800ul, 0x20000840ul);
    break;
  case 20:
    memcpy((void*)0x20000880, "./file0\000", 8);
    syscall(SYS_mknod, 0x20000880ul, 0xc000ul, 0x9dec);
    break;
  case 21:
    memcpy((void*)0x200008c0, "./file0\000", 8);
    syscall(SYS_open, 0x200008c0ul, 0x1000ul, 0xd540160e99cb9b71ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul, 0ul);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}