// https://syzkaller.appspot.com/bug?id=68432c6ea11f9bb57f39995aaf6bf58eb9d46b17
// 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>

static 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 < 6; 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_mmap
#define SYS_mmap 197
#endif
#ifndef SYS_open
#define SYS_open 5
#endif
#ifndef SYS_writev
#define SYS_writev 121
#endif

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

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    memcpy((void*)0x20000040, "./file0\000", 8);
    res = syscall(SYS_open, 0x20000040ul, 0x615ul, 0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    memcpy((void*)0x20000100, "./file0\000", 8);
    res = syscall(SYS_open, 0x20000100ul, 0x40000400000002c2ul, 0ul);
    if (res != -1)
      r[1] = res;
    break;
  case 2:
    *(uint64_t*)0x20000340 = 0x20000180;
    *(uint64_t*)0x20000348 = 0x81700;
    syscall(SYS_writev, r[1], 0x20000340ul, 0x1000000000000013ul);
    break;
  case 3:
    syscall(SYS_mmap, 0x20000000ul, 0x3000ul, 2ul, 0x11ul, r[0], 0ul, 0ul);
    break;
  case 4:
    memcpy((void*)0x20000100, "./file0\000", 8);
    res = syscall(SYS_open, 0x20000100ul, 0x40000400000002c2ul, 0ul);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    *(uint64_t*)0x20000640 = 0;
    *(uint64_t*)0x20000648 = 0;
    *(uint64_t*)0x20000650 = 0;
    *(uint64_t*)0x20000658 = 0;
    *(uint64_t*)0x20000660 = 0x20000200;
    memcpy((void*)0x20000200,
           "\x96\x39\x58\x2f\x8d\xca\x02\xc5\x51\x32\x6f\xdb\xfe\xbf\x28\x92"
           "\x69\x4d\x6d\x01\x83\x4e\x6e\x90\x5d\x56\xec\x43\xd6\x60\xd1\x36"
           "\x0c\x7c\x4c\xc1\xf9\x80\x6d\xdb\x0d\xd7\x09\xf5\xc7\x48\xfe\xf7"
           "\xc8\x56\xec\xe9\xa0\x99\x12\x23\x44\xf1\x7a\xc6\xee\x99\x56\xaa"
           "\x35\x37\x26\xe5\x10\xad\xd8\x49\x5c\xc4\x81\x15\xab\xdf\x19\x03"
           "\x68\xb9\x4b\x63\x28\x2a\x24\xb9\xa1\x69\x6a\x26\x65\xde\x0b\xe8"
           "\x63\x41\x35\x7d\xc7\x15\x47\xe5\x13\x6a\x44\x0b\x93\x8f\x50\x0b"
           "\xa3\xc6\xff\x0e\x2a\xd5\x84\xa9\x13\x36\x40\xca\xef\xef\x48\xac"
           "\x32\x0b\x0c\x04\x77\x73\x3b\xcc\x06\x78\x70\x31\x9c\x8a\x89\xaa"
           "\x6f\x15\xb4\xb6\xcc\xbf\x15\x1a\x37\x5a\xa4\x3b\x0b\x7a\xa2\x78"
           "\x90\x73\x21\x32\xd9\x9a\x67\x73\xa2\xe1\x33\x23\xf4\x49\x41\x27"
           "\x54\x7b\x97\x97\x10\x88\xa1\x23\xb0\x54\x90\x99\x86\x59\xfd\x29"
           "\x8d\xb4\x4e\x47\x8b\x44\x72\xa2\x9e\x4a\x15\xbc\xdd\x62\x9b\xff"
           "\x4c\x88\x85\x57\x73\xd3\x4c\x94\x17\x59\x56\xd5\xca\xae\x12\x76"
           "\xaa",
           225);
    *(uint64_t*)0x20000668 = 0xe1;
    *(uint64_t*)0x20000670 = 0;
    *(uint64_t*)0x20000678 = 0;
    *(uint64_t*)0x20000680 = 0;
    *(uint64_t*)0x20000688 = 0;
    *(uint64_t*)0x20000690 = 0;
    *(uint64_t*)0x20000698 = 0;
    *(uint64_t*)0x200006a0 = 0;
    *(uint64_t*)0x200006a8 = 0;
    *(uint64_t*)0x200006b0 = 0;
    *(uint64_t*)0x200006b8 = 0;
    *(uint64_t*)0x200006c0 = 0;
    *(uint64_t*)0x200006c8 = 0;
    *(uint64_t*)0x200006d0 = 0;
    *(uint64_t*)0x200006d8 = 0;
    *(uint64_t*)0x200006e0 = 0;
    *(uint64_t*)0x200006e8 = 0;
    *(uint64_t*)0x200006f0 = 0;
    *(uint64_t*)0x200006f8 = 0;
    syscall(SYS_writev, r[2], 0x20000640ul, 0xcul);
    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;
}