// https://syzkaller.appspot.com/bug?id=e2fe06b813f900f9c187da84bfd42eab23d0b84c
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/futex.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <stdint.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("loop fork failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_open
#define __NR_open 5
#endif
#ifndef __NR_inotify_init1
#define __NR_inotify_init1 332
#endif
#ifndef __NR_getsockopt
#define __NR_getsockopt 365
#endif
#ifndef __NR_fcntl
#define __NR_fcntl 55
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#ifndef __NR_ptrace
#define __NR_ptrace 26
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[3];
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    memcpy((void*)0x2052d000, "./file0", 8);
    syscall(__NR_open, 0x2052d000, 0x301000, 0xc);
    break;
  case 2:
    r[0] = syscall(__NR_inotify_init1, 0x80800);
    break;
  case 3:
    *(uint32_t*)0x20000000 = 0xc;
    if (syscall(__NR_getsockopt, -1, 1, 0x11, 0x20000ff4, 0x20000000) != -1)
      r[1] = *(uint32_t*)0x20000ff4;
    break;
  case 4:
    syscall(__NR_fcntl, r[0], 8, r[1]);
    break;
  case 5:
    if (syscall(__NR_fcntl, r[0], 0x10, 0x206dbff8) != -1)
      r[2] = *(uint32_t*)0x206dbffc;
    break;
  case 6:
    *(uint8_t*)0x20fa1f50 = 2;
    *(uint8_t*)0x20fa1f51 = 7;
    memcpy((void*)0x20fa1f52,
           "\x70\x6f\x72\x74\x31\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
           64);
    *(uint32_t*)0x20fa1f94 = 0x13;
    *(uint32_t*)0x20fa1f98 = 0x160000;
    *(uint32_t*)0x20fa1f9c = -1;
    *(uint32_t*)0x20fa1fa0 = 0x6ad1;
    *(uint32_t*)0x20fa1fa4 = 0xffff7fff;
    *(uint32_t*)0x20fa1fa8 = 0xfffff800;
    *(uint32_t*)0x20fa1fac = 0x10001;
    *(uint32_t*)0x20fa1fb0 = 0;
    *(uint32_t*)0x20fa1fb4 = 6;
    *(uint32_t*)0x20fa1fb8 = 1;
    *(uint8_t*)0x20fa1fbc = 0;
    *(uint8_t*)0x20fa1fbd = 0;
    *(uint8_t*)0x20fa1fbe = 0;
    *(uint8_t*)0x20fa1fbf = 0;
    *(uint8_t*)0x20fa1fc0 = 0;
    *(uint8_t*)0x20fa1fc1 = 0;
    *(uint8_t*)0x20fa1fc2 = 0;
    *(uint8_t*)0x20fa1fc3 = 0;
    *(uint8_t*)0x20fa1fc4 = 0;
    *(uint8_t*)0x20fa1fc5 = 0;
    *(uint8_t*)0x20fa1fc6 = 0;
    *(uint8_t*)0x20fa1fc7 = 0;
    *(uint8_t*)0x20fa1fc8 = 0;
    *(uint8_t*)0x20fa1fc9 = 0;
    *(uint8_t*)0x20fa1fca = 0;
    *(uint8_t*)0x20fa1fcb = 0;
    *(uint8_t*)0x20fa1fcc = 0;
    *(uint8_t*)0x20fa1fcd = 0;
    *(uint8_t*)0x20fa1fce = 0;
    *(uint8_t*)0x20fa1fcf = 0;
    *(uint8_t*)0x20fa1fd0 = 0;
    *(uint8_t*)0x20fa1fd1 = 0;
    *(uint8_t*)0x20fa1fd2 = 0;
    *(uint8_t*)0x20fa1fd3 = 0;
    *(uint8_t*)0x20fa1fd4 = 0;
    *(uint8_t*)0x20fa1fd5 = 0;
    *(uint8_t*)0x20fa1fd6 = 0;
    *(uint8_t*)0x20fa1fd7 = 0;
    *(uint8_t*)0x20fa1fd8 = 0;
    *(uint8_t*)0x20fa1fd9 = 0;
    *(uint8_t*)0x20fa1fda = 0;
    *(uint8_t*)0x20fa1fdb = 0;
    *(uint8_t*)0x20fa1fdc = 0;
    *(uint8_t*)0x20fa1fdd = 0;
    *(uint8_t*)0x20fa1fde = 0;
    *(uint8_t*)0x20fa1fdf = 0;
    *(uint8_t*)0x20fa1fe0 = 0;
    *(uint8_t*)0x20fa1fe1 = 0;
    *(uint8_t*)0x20fa1fe2 = 0;
    *(uint8_t*)0x20fa1fe3 = 0;
    *(uint8_t*)0x20fa1fe4 = 0;
    *(uint8_t*)0x20fa1fe5 = 0;
    *(uint8_t*)0x20fa1fe6 = 0;
    *(uint8_t*)0x20fa1fe7 = 0;
    *(uint8_t*)0x20fa1fe8 = 0;
    *(uint8_t*)0x20fa1fe9 = 0;
    *(uint8_t*)0x20fa1fea = 0;
    *(uint8_t*)0x20fa1feb = 0;
    *(uint8_t*)0x20fa1fec = 0;
    *(uint8_t*)0x20fa1fed = 0;
    *(uint8_t*)0x20fa1fee = 0;
    *(uint8_t*)0x20fa1fef = 0;
    *(uint8_t*)0x20fa1ff0 = 0;
    *(uint8_t*)0x20fa1ff1 = 0;
    *(uint8_t*)0x20fa1ff2 = 0;
    *(uint8_t*)0x20fa1ff3 = 0;
    *(uint8_t*)0x20fa1ff4 = 0;
    *(uint8_t*)0x20fa1ff5 = 0;
    *(uint8_t*)0x20fa1ff6 = 0;
    syscall(__NR_ioctl, -1, 0xc0a85352, 0x20fa1f50);
    break;
  case 7:
    syscall(__NR_ptrace, 0x4200, r[2], 0, 0x100000);
    break;
  case 8:
    syscall(__NR_ptrace, 0x10, r[2]);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(9);
  collide = 1;
  execute(9);
}

int main()
{
  for (;;) {
    loop();
  }
}