// https://syzkaller.appspot.com/bug?id=7f159bcdfc352416ad3e2f126dfb22704b3bc177
// 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 <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/stat.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 __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  struct sigaction sa;

  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

static void use_temporary_dir()
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    fail("failed to mkdtemp");
  if (chmod(tmpdir, 0777))
    fail("failed to chmod");
  if (chdir(tmpdir))
    fail("failed to chdir");
}

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 = 160 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 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);

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  loop();
  doexit(1);
}

static void execute_one();
extern unsigned long long procid;

void loop()
{
  while (1) {
    execute_one();
  }
}

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_rename
#define __NR_rename 38
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_mkdir
#define __NR_mkdir 39
#endif
#ifndef __NR_mount
#define __NR_mount 21
#endif
#ifndef __NR_bind
#define __NR_bind 361
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

unsigned long long procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    NONFAILING(memcpy((void*)0x20000000, "./file0", 8));
    syscall(__NR_mkdir, 0x20000000, 0);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x20000380, "./file0", 8));
    NONFAILING(memcpy((void*)0x20026ff8, "./file0", 8));
    NONFAILING(memcpy((void*)0x20000300, "ramfs", 6));
    syscall(__NR_mount, 0x20000380, 0x20026ff8, 0x20000300, 0, 0x200007c0);
    break;
  case 2:
    NONFAILING(*(uint16_t*)0x200001c0 = 4);
    NONFAILING(*(uint16_t*)0x200001c2 = htobe16(0));
    NONFAILING(*(uint32_t*)0x200001c4 = htobe32(0));
    NONFAILING(memcpy((void*)0x200001c8, "\x0a\x04\xdf\xa8\x09\xba", 6));
    NONFAILING(*(uint8_t*)0x200001ce = 0);
    NONFAILING(*(uint8_t*)0x200001cf = 0);
    syscall(__NR_bind, -1, 0x200001c0, 0x80);
    break;
  case 3:
    NONFAILING(memcpy((void*)0x20d04000, "./file0", 8));
    NONFAILING(memcpy((void*)0x20903000, "./file0", 8));
    NONFAILING(memcpy((void*)0x20000340, "bdev", 5));
    syscall(__NR_mount, 0x20d04000, 0x20903000, 0x20000340, 0x100000,
            0x200002c0);
    break;
  case 4:
    NONFAILING(memcpy((void*)0x20000240, "./file0", 8));
    NONFAILING(memcpy((void*)0x20000280, ".", 1));
    NONFAILING(memcpy((void*)0x20000040, "\x04\x5b\x89\x8f\x73", 5));
    syscall(__NR_mount, 0x20000240, 0x20000280, 0x20000040, 0x1004, 0);
    break;
  case 5:
    NONFAILING(memcpy((void*)0x20000000, "./file0", 8));
    NONFAILING(memcpy((void*)0x200000c0, ".", 1));
    NONFAILING(memcpy((void*)0x20000140, "vxfs", 5));
    syscall(__NR_mount, 0x20000000, 0x200000c0, 0x20000140, 0x3080, 0x20000200);
    break;
  case 6:
    NONFAILING(memcpy((void*)0x200008c0, ".", 1));
    NONFAILING(memcpy((void*)0x20000080, ".", 1));
    NONFAILING(memcpy((void*)0x20753000, "mslos", 6));
    syscall(__NR_mount, 0x200008c0, 0x20000080, 0x20753000, 0x5010, 0x20000ac0);
    break;
  case 7:
    NONFAILING(memcpy((void*)0x20fb6000, "./file0", 8));
    NONFAILING(memcpy((void*)0x20d78000, ".", 1));
    NONFAILING(memcpy((void*)0x20fdb000, "ubifs", 6));
    syscall(__NR_mount, 0x20fb6000, 0x20d78000, 0x20fdb000, 0x1003, 0);
    break;
  case 8:
    NONFAILING(memcpy((void*)0x202b9ff8, "./file0", 8));
    NONFAILING(memcpy((void*)0x20cbeff8, "./file0", 8));
    NONFAILING(memcpy((void*)0x205f7ffa, "ramfs", 6));
    syscall(__NR_mount, 0x202b9ff8, 0x20cbeff8, 0x205f7ffa, 0, 0x2002f000);
    break;
  case 9:
    NONFAILING(memcpy((void*)0x20000100, "./file0/file0", 14));
    syscall(__NR_mkdir, 0x20000100, 0);
    break;
  case 10:
    NONFAILING(memcpy((void*)0x20000400, "./file0/file1", 14));
    NONFAILING(memcpy((void*)0x200003c0, "./file0", 8));
    NONFAILING(memcpy((void*)0x20753000, "qnx6", 5));
    syscall(__NR_mount, 0x20000400, 0x200003c0, 0x20753000, 0x5410, 0x200002c0);
    break;
  case 11:
    NONFAILING(memcpy((void*)0x20000040, "./file0/file0", 14));
    NONFAILING(memcpy((void*)0x20000140, "./file0/file1", 14));
    syscall(__NR_rename, 0x20000040, 0x20000140);
    break;
  }
}

void execute_one()
{
  execute(12);
  collide = 1;
  execute(12);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  char* cwd = get_current_dir_name();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        if (chdir(cwd))
          fail("failed to chdir");
        use_temporary_dir();
        int pid = do_sandbox_none();
        int status = 0;
        while (waitpid(pid, &status, __WALL) != pid) {
        }
      }
    }
  }
  sleep(1000000);
  return 0;
}