// https://syzkaller.appspot.com/bug?id=578218eb5c779ebb43db291994cb99ee3b040681
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/time.h>
#include <sys/wait.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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);

#define CLONE_NEWCGROUP 0x02000000

  unshare(CLONE_NEWNS);
  unshare(CLONE_NEWIPC);
  unshare(CLONE_NEWCGROUP);
  unshare(CLONE_NEWNET);
  unshare(CLONE_NEWUTS);
  unshare(CLONE_SYSVSEM);
}

static int do_sandbox_none(int executor_pid, bool enable_tun)
{
  unshare(CLONE_NEWPID);
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  sandbox_common();

  loop();
  doexit(1);
}

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_setsockopt
#define __NR_setsockopt 366
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_openat
#define __NR_openat 295
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[2];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    memcpy((void*)0x2066e000, "/dev/loop-control", 18);
    r[0] = syscall(__NR_openat, 0xffffff9c, 0x2066e000, 0, 0);
    break;
  case 2:
    r[1] = syscall(__NR_ioctl, r[0], 0x4c82);
    break;
  case 3:
    syscall(__NR_ioctl, r[0], 0x4c81, r[1]);
    break;
  case 4:
    memcpy((void*)0x202a0000, "/dev/loop#", 11);
    syz_open_dev(0x202a0000, 4, 0x44042);
    break;
  case 5:
    *(uint16_t*)0x20694000 = 0xa;
    *(uint16_t*)0x20694002 = htobe16(0x4e20 + procid * 4);
    *(uint32_t*)0x20694004 = 0xffff;
    *(uint8_t*)0x20694008 = 0;
    *(uint8_t*)0x20694009 = 0;
    *(uint8_t*)0x2069400a = 0;
    *(uint8_t*)0x2069400b = 0;
    *(uint8_t*)0x2069400c = 0;
    *(uint8_t*)0x2069400d = 0;
    *(uint8_t*)0x2069400e = 0;
    *(uint8_t*)0x2069400f = 0;
    *(uint8_t*)0x20694010 = 0;
    *(uint8_t*)0x20694011 = 0;
    *(uint8_t*)0x20694012 = 0;
    *(uint8_t*)0x20694013 = 0;
    *(uint8_t*)0x20694014 = 0;
    *(uint8_t*)0x20694015 = 0;
    *(uint8_t*)0x20694016 = 0;
    *(uint8_t*)0x20694017 = 0;
    *(uint32_t*)0x20694018 = 9;
    *(uint16_t*)0x2069401c = 0xa;
    *(uint16_t*)0x2069401e = htobe16(0x4e21 + procid * 4);
    *(uint32_t*)0x20694020 = 9;
    *(uint8_t*)0x20694024 = 0xfe;
    *(uint8_t*)0x20694025 = 0x80;
    *(uint8_t*)0x20694026 = 0;
    *(uint8_t*)0x20694027 = 0;
    *(uint8_t*)0x20694028 = 0;
    *(uint8_t*)0x20694029 = 0;
    *(uint8_t*)0x2069402a = 0;
    *(uint8_t*)0x2069402b = 0;
    *(uint8_t*)0x2069402c = 0;
    *(uint8_t*)0x2069402d = 0;
    *(uint8_t*)0x2069402e = 0;
    *(uint8_t*)0x2069402f = 0;
    *(uint8_t*)0x20694030 = 0;
    *(uint8_t*)0x20694031 = 0;
    *(uint8_t*)0x20694032 = 0 + procid * 1;
    *(uint8_t*)0x20694033 = 0xaa;
    *(uint32_t*)0x20694034 = 2;
    *(uint16_t*)0x20694038 = 4;
    *(uint32_t*)0x2069403c = 6;
    *(uint32_t*)0x20694040 = 0x80;
    *(uint32_t*)0x20694044 = 0x84;
    *(uint32_t*)0x20694048 = 0;
    *(uint32_t*)0x2069404c = 0x3ff;
    *(uint32_t*)0x20694050 = 0xb50;
    *(uint32_t*)0x20694054 = 0x87b;
    *(uint32_t*)0x20694058 = 0x84;
    syscall(__NR_setsockopt, -1, 0x29, 0xcc, 0x20694000, 0x5c);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(6);
  collide = 1;
  execute(6);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        int pid = do_sandbox_none(procid, false);
        int status = 0;
        while (waitpid(pid, &status, __WALL) != pid) {
        }
      }
    }
  }
  sleep(1000000);
  return 0;
}