// https://syzkaller.appspot.com/bug?id=6fc2f98aafbf776e56998a7c4cd7f9f717ae1b62
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/stat.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 <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.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 void exitf(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(kRetryStatus);
}

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);
  for (;;) {
  }
}

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 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 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 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;
    NONFAILING(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 remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exitf("opendir(%s) failed due to NOFILE, exiting");
    }
    exitf("opendir(%s) failed", dir);
  }
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    struct stat st;
    if (lstat(filename, &st))
      exitf("lstat(%s) failed", filename);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exitf("unlink(%s) failed", filename);
      if (umount2(filename, MNT_DETACH))
        exitf("umount(%s) failed", filename);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exitf("umount(%s) failed", dir);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exitf("rmdir(%s) failed", dir);
  }
}

static void test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[256];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      fail("failed to mkdir");
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      if (chdir(cwdbuf))
        fail("failed to chdir");
      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;
      }
    }
    remove_dir(cwdbuf);
  }
}

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif
#ifndef __NR_userfaultfd
#define __NR_userfaultfd 323
#endif

long r[77];
void test()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x10ul,
                 0xfffffffffffffffful, 0x0ul);
  r[1] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  NONFAILING(memcpy((void*)0x2040aff5,
                    "\x2f\x64\x65\x76\x2f\x6c\x6f\x6f\x70\x23\x00",
                    11));
  r[3] = syz_open_dev(0x2040aff5ul, 0x0ul, 0x1ul);
  NONFAILING(
      memcpy((void*)0x20909ff8, "\x00\x00\x00\x00\x00\x00\x02\x00", 8));
  r[5] = syscall(__NR_memfd_create, 0x20909ff8ul, 0x2ul);
  NONFAILING(*(uint64_t*)0x200a3ff0 = (uint64_t)0x20c13e00);
  NONFAILING(*(uint64_t*)0x200a3ff8 = (uint64_t)0x1bb);
  NONFAILING(memcpy(
      (void*)0x20c13e00,
      "\xb5\x10\x7b\x98\x1c\x0d\xed\x89\x94\x42\xee\xc2\xca\xb7\xe2\xc9"
      "\xe6\xcd\x9a\xee\xb4\x18\xde\xd0\x08\x97\x23\x03\x33\x9e\xa7\x48"
      "\x1a\xa2\xb3\xd0\x78\x6a\x90\x17\x40\xa8\x6a\xbe\x45\x07\x45\x32"
      "\x17\xc9\xf6\xa4\xaf\xf9\xf4\x2d\x64\xe9\xdf\xe9\x5e\xdc\x99\xab"
      "\x6e\x28\xe2\xcf\xb8\x89\xb9\x00\xa9\xd9\x99\x14\x0b\x47\x17\xbd"
      "\x64\x80\xea\x00\x0f\x7e\x16\x7e\xe7\xbe\xc2\xcf\xe3\x16\x73\xa8"
      "\x8b\xa1\x60\xa9\xbd\x59\x3e\xb0\xd9\x0f\x1e\x0c\x2e\xee\x40\xa1"
      "\x42\xa5\x0a\x08\x13\x7a\xe8\x65\x8d\xe4\xd1\xa0\x8a\xd6\xd2\x38"
      "\x1c\xfd\x97\x30\x02\x09\x06\x5a\x18\x01\x69\xb7\x94\x7c\x32\xce"
      "\x3f\x3f\xf4\x22\xa7\x65\x28\x04\x50\x5a\x06\xa0\x56\x73\x8b\x62"
      "\x74\x58\x82\x32\xde\x69\xf6\x78\x25\xae\x03\x13\x9e\x7d\x60\xca"
      "\x79\xc5\x94\x08\xe6\x49\xfa\xc9\x3d\x6b\xab\x13\x11\x2e\x70\xb8"
      "\xa5\x2e\x68\xad\x63\xba\xc4\xf0\xaa\xba\x1b\x71\x33\x77\x9f\xda"
      "\xb0\x6f\x09\xe0\x22\xf9\xd6\x05\xe8\x00\x51\xce\x42\x9d\x28\x12"
      "\xf6\x32\xf6\x58\x58\x28\x93\x3f\x8b\xc1\x5d\x79\x27\xe4\x1b\x1e"
      "\xbb\x16\xe7\x15\x93\xd9\x2e\xce\x21\xd5\xf0\x42\x54\xc2\xc7\x41"
      "\x67\xab\xcb\x2f\x27\x76\x13\xbc\x7f\x7c\xdb\x6a\x36\x98\xe2\xa8"
      "\x79\xfa\xbb\x48\x10\x15\x92\x8f\x06\xd3\x92\x5c\xa8\x03\xf5\xcb"
      "\x27\x5c\x38\x1c\x3e\x91\xf4\x52\x70\x8e\xc8\x82\x7d\x8c\x76\x2c"
      "\xb8\x86\xe8\x68\x69\x0d\x1a\x62\x59\x78\xd7\xb9\x78\x6f\x21\xa7"
      "\xd6\x0f\x27\x3a\x5f\xb5\xc8\xa0\xdd\xdc\xaa\x65\x38\x72\x64\xa1"
      "\x04\xca\xf8\x2a\x45\x1f\x4e\x83\x92\x8a\xa5\xd5\xfa\xa7\x9f\x00"
      "\x95\xbf\x9c\xae\x38\x31\x6a\xb8\xa2\x73\xdf\x80\xdd\x74\xc0\xc1"
      "\xa0\xf8\xda\xa2\x00\x6d\x01\xad\xcb\x97\x22\x9d\xeb\x1b\xdf\xdb"
      "\x57\xd1\x7a\x98\x41\x5d\x1a\xba\x54\x26\x97\xf1\xa9\x2b\x45\xca"
      "\x50\x2d\xc8\xb5\x1b\xf5\x4b\xa1\x7d\xcc\xa0\xe1\xfe\x5c\x52\x52"
      "\x24\x3f\x0c\xf9\x7a\xd6\x10\x44\xc5\xef\xb4\x3a\x26\xae\x00\x4b"
      "\x06\xbf\xf6\x9d\xf7\xed\xf2\x48\xc0\x3c\x11",
      443));
  r[9] = syscall(__NR_pwritev, r[5], 0x200a3ff0ul, 0x1ul, 0x49ul);
  r[10] = syscall(__NR_ioctl, r[3], 0x4c00ul, r[5]);
  NONFAILING(*(uint64_t*)0x200ddff8 = (uint64_t)0x0);
  r[12] =
      syscall(__NR_sendfile, r[3], r[5], 0x200ddff8ul, 0x100000001ul);
  r[13] = syscall(__NR_gettid);
  NONFAILING(*(uint64_t*)0x206fdf18 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x206fdf20 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x206fdf28 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x206fdf30 = (uint64_t)0xfffffffffffff000);
  NONFAILING(*(uint64_t*)0x206fdf38 = (uint64_t)0x3ea);
  NONFAILING(*(uint32_t*)0x206fdf40 = (uint32_t)0x0);
  NONFAILING(*(uint32_t*)0x206fdf44 = (uint32_t)0x0);
  NONFAILING(*(uint32_t*)0x206fdf48 = (uint32_t)0x1e);
  NONFAILING(*(uint32_t*)0x206fdf4c = (uint32_t)0xd);
  NONFAILING(memcpy((void*)0x206fdf50,
                    "\x32\xb0\x5d\x80\x1e\x66\x49\xb8\x12\xd2\xe6\xb6"
                    "\xcc\x15\x94\x42\xb1\x21\x53\x13\x2c\x9b\xf9\x44"
                    "\xcf\x27\x00\x12\xda\x21\xba\x80\xc0\x40\x39\x77"
                    "\x14\xf7\x7f\xaa\x1e\x8e\xd3\xfc\x72\x09\xd6\x4d"
                    "\x14\xce\xc7\x47\x9b\x05\xca\xe0\xc7\x32\xde\x3a"
                    "\xb6\xcc\x5f\x4b",
                    64));
  NONFAILING(memcpy((void*)0x206fdf90,
                    "\x94\x14\x06\x56\x9a\x73\xd0\x65\x56\xae\xe2\x94"
                    "\x3f\x5e\x94\xc8\x44\xa5\x55\x27\xaf\x84\xfb\x28"
                    "\xf0\x11\x82\x5a\xf6\x09\x10\xe7\x70\x6e\xb4\x78"
                    "\x6b\x3a\x97\x6d\xa7\xb5\x72\x11\xaf\x83\x4e\x7d"
                    "\x98\xb8\x39\x62\x96\x89\xa1\x47\x2f\x55\x78\xb2"
                    "\x99\x8b\xd7\xda",
                    64));
  NONFAILING(memcpy((void*)0x206fdfd0,
                    "\xef\xd5\x59\x22\xa7\xdc\x32\x93\x94\x61\x0a\xfb"
                    "\xac\xd2\x37\xd2\x34\xaf\xb8\x05\xeb\xc3\xb9\x4e"
                    "\x4f\xb9\xd5\x6d\xd0\x3f\x1f\x8b",
                    32));
  NONFAILING(*(uint64_t*)0x206fdff0 = (uint64_t)0x905);
  NONFAILING(*(uint64_t*)0x206fdff8 = (uint64_t)0x8);
  r[28] = syscall(__NR_ioctl, r[3], 0x4c04ul, 0x206fdf18ul);
  r[29] = syscall(__NR_sync_file_range, r[3], 0x7ful, 0x801ul, 0x7ul);
  NONFAILING(*(uint16_t*)0x20685000 = (uint16_t)0x0);
  NONFAILING(*(uint16_t*)0x20685002 = (uint16_t)0x0);
  NONFAILING(*(uint32_t*)0x20685004 = (uint32_t)0x9);
  NONFAILING(*(uint32_t*)0x20685008 = (uint32_t)0x5);
  NONFAILING(*(uint32_t*)0x2068500c = (uint32_t)0x0);
  NONFAILING(*(uint32_t*)0x208daffc = (uint32_t)0x10);
  r[36] = syscall(__NR_getsockopt, r[5], 0x84ul, 0x22ul, 0x20685000ul,
                  0x208daffcul);
  if (r[36] != -1)
    NONFAILING(r[37] = *(uint32_t*)0x2068500c);
  NONFAILING(*(uint32_t*)0x2054ff74 = r[37]);
  NONFAILING(*(uint16_t*)0x2054ff78 = (uint16_t)0xa);
  NONFAILING(*(uint16_t*)0x2054ff7a = (uint16_t)0x204e);
  NONFAILING(*(uint32_t*)0x2054ff7c = (uint32_t)0x8);
  NONFAILING(*(uint8_t*)0x2054ff80 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff81 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff82 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff83 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff84 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff85 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff86 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff87 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff88 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff89 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff8a = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff8b = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff8c = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff8d = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff8e = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2054ff8f = (uint8_t)0x0);
  NONFAILING(*(uint32_t*)0x2054ff90 = (uint32_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ff98 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffa0 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffa8 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffb0 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffb8 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffc0 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffc8 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffd0 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffd8 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffe0 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054ffe8 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2054fff0 = (uint64_t)0x0);
  NONFAILING(*(uint32_t*)0x200e5000 = (uint32_t)0x8c);
  r[72] = syscall(__NR_getsockopt, r[5], 0x84ul, 0x6ul, 0x2054ff74ul,
                  0x200e5000ul);
  r[73] = syscall(__NR_userfaultfd, 0x80000ul);
  NONFAILING(memcpy((void*)0x20e57ff5,
                    "\x2f\x64\x65\x76\x2f\x6c\x6f\x6f\x70\x23\x00",
                    11));
  r[75] = syz_open_dev(0x20e57ff5ul, 0x0ul, 0x4102ul);
  r[76] = syscall(__NR_shmctl, 0x0ul, 0x3ul, 0x20e5b000ul);
}

int main()
{
  int i;
  for (i = 0; i < 8; i++) {
    if (fork() == 0) {
      install_segv_handler();
      use_temporary_dir();
      loop();
      return 0;
    }
  }
  sleep(1000000);
  return 0;
}