// https://syzkaller.appspot.com/bug?id=6dcd14a729df98f989c7b76d254226ae67084efd
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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 <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);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

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 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", dir);
    }
    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("loop fork 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);
  }
}

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 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);
        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_write
#define __NR_write 4
#endif
#ifndef __NR_read
#define __NR_read 3
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[1];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x2002a000, "/dev/sg#", 9));
    r[0] = syz_open_dev(0x2002a000, 0, 0x142);
    break;
  case 2:
    NONFAILING(*(uint8_t*)0x205c3000 = 0);
    NONFAILING(*(uint8_t*)0x205c3001 = 0);
    NONFAILING(*(uint16_t*)0x205c3002 = 1);
    NONFAILING(*(uint16_t*)0x205c3004 = 0xff01);
    NONFAILING(*(uint16_t*)0x205c3006 = 5);
    NONFAILING(*(uint16_t*)0x205c3008 = 1);
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x205c300a, 3, 0, 4));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x205c300a, 6, 4, 4));
    NONFAILING(memcpy((void*)0x205c300b, "\xde\x57\x29", 3));
    NONFAILING(*(uint16_t*)0x205c300e = htobe16(0xbc));
    NONFAILING(*(uint8_t*)0x205c3010 = 0x7f);
    NONFAILING(*(uint8_t*)0x205c3011 = 9);
    NONFAILING(*(uint8_t*)0x205c3012 = 0xfe);
    NONFAILING(*(uint8_t*)0x205c3013 = 0x80);
    NONFAILING(*(uint8_t*)0x205c3014 = 0);
    NONFAILING(*(uint8_t*)0x205c3015 = 0);
    NONFAILING(*(uint8_t*)0x205c3016 = 0);
    NONFAILING(*(uint8_t*)0x205c3017 = 0);
    NONFAILING(*(uint8_t*)0x205c3018 = 0);
    NONFAILING(*(uint8_t*)0x205c3019 = 0);
    NONFAILING(*(uint8_t*)0x205c301a = 0);
    NONFAILING(*(uint8_t*)0x205c301b = 0);
    NONFAILING(*(uint8_t*)0x205c301c = 0);
    NONFAILING(*(uint8_t*)0x205c301d = 0);
    NONFAILING(*(uint8_t*)0x205c301e = 0);
    NONFAILING(*(uint8_t*)0x205c301f = 0);
    NONFAILING(*(uint8_t*)0x205c3020 = 0 + procid * 1);
    NONFAILING(*(uint8_t*)0x205c3021 = 0xaa);
    NONFAILING(*(uint8_t*)0x205c3022 = 0xfe);
    NONFAILING(*(uint8_t*)0x205c3023 = 0x80);
    NONFAILING(*(uint8_t*)0x205c3024 = 0);
    NONFAILING(*(uint8_t*)0x205c3025 = 0);
    NONFAILING(*(uint8_t*)0x205c3026 = 0);
    NONFAILING(*(uint8_t*)0x205c3027 = 0);
    NONFAILING(*(uint8_t*)0x205c3028 = 0);
    NONFAILING(*(uint8_t*)0x205c3029 = 0);
    NONFAILING(*(uint8_t*)0x205c302a = 0);
    NONFAILING(*(uint8_t*)0x205c302b = 0);
    NONFAILING(*(uint8_t*)0x205c302c = 0);
    NONFAILING(*(uint8_t*)0x205c302d = 0);
    NONFAILING(*(uint8_t*)0x205c302e = 0);
    NONFAILING(*(uint8_t*)0x205c302f = 0);
    NONFAILING(*(uint8_t*)0x205c3030 = 0 + procid * 1);
    NONFAILING(*(uint8_t*)0x205c3031 = 0xaa);
    NONFAILING(*(uint8_t*)0x205c3032 = 0);
    NONFAILING(*(uint8_t*)0x205c3033 = 1);
    NONFAILING(*(uint8_t*)0x205c3034 = 0);
    NONFAILING(*(uint8_t*)0x205c3035 = 0);
    NONFAILING(*(uint8_t*)0x205c3036 = 0);
    NONFAILING(*(uint8_t*)0x205c3037 = 0);
    NONFAILING(*(uint8_t*)0x205c3038 = 0);
    NONFAILING(*(uint8_t*)0x205c3039 = 0);
    NONFAILING(*(uint8_t*)0x205c303a = 0xfe);
    NONFAILING(*(uint8_t*)0x205c303b = 0);
    NONFAILING(*(uint8_t*)0x205c303c = -1);
    NONFAILING(*(uint8_t*)0x205c303d = 0);
    NONFAILING(*(uint8_t*)0x205c303e = 0xcb);
    NONFAILING(*(uint8_t*)0x205c303f = 0);
    NONFAILING(*(uint8_t*)0x205c3040 = 5);
    NONFAILING(*(uint8_t*)0x205c3041 = 0);
    NONFAILING(*(uint8_t*)0x205c3042 = 0xfe);
    NONFAILING(*(uint8_t*)0x205c3043 = 0);
    NONFAILING(*(uint8_t*)0x205c304a = 0);
    NONFAILING(*(uint8_t*)0x205c304b = 8);
    NONFAILING(*(uint8_t*)0x205c304c = 0);
    NONFAILING(*(uint8_t*)0x205c304d = 0);
    NONFAILING(*(uint32_t*)0x205c304e = htobe32(7));
    NONFAILING(*(uint8_t*)0x205c3052 = 0xfe);
    NONFAILING(*(uint8_t*)0x205c3053 = 0x80);
    NONFAILING(*(uint8_t*)0x205c3054 = 0);
    NONFAILING(*(uint8_t*)0x205c3055 = 0);
    NONFAILING(*(uint8_t*)0x205c3056 = 0);
    NONFAILING(*(uint8_t*)0x205c3057 = 0);
    NONFAILING(*(uint8_t*)0x205c3058 = 0);
    NONFAILING(*(uint8_t*)0x205c3059 = 0);
    NONFAILING(*(uint8_t*)0x205c305a = 0);
    NONFAILING(*(uint8_t*)0x205c305b = 0);
    NONFAILING(*(uint8_t*)0x205c305c = 0);
    NONFAILING(*(uint8_t*)0x205c305d = 0);
    NONFAILING(*(uint8_t*)0x205c305e = 0);
    NONFAILING(*(uint8_t*)0x205c305f = 0);
    NONFAILING(*(uint8_t*)0x205c3060 = 0 + procid * 1);
    NONFAILING(*(uint8_t*)0x205c3061 = 0xaa);
    NONFAILING(*(uint8_t*)0x205c3062 = 0);
    NONFAILING(*(uint8_t*)0x205c3063 = 0);
    NONFAILING(*(uint8_t*)0x205c3064 = 0);
    NONFAILING(*(uint8_t*)0x205c3065 = 0);
    NONFAILING(*(uint8_t*)0x205c3066 = 0);
    NONFAILING(*(uint8_t*)0x205c3067 = 0);
    NONFAILING(*(uint8_t*)0x205c3068 = 0);
    NONFAILING(*(uint8_t*)0x205c3069 = 0);
    NONFAILING(*(uint8_t*)0x205c306a = 0);
    NONFAILING(*(uint8_t*)0x205c306b = 0);
    NONFAILING(*(uint8_t*)0x205c306c = 0);
    NONFAILING(*(uint8_t*)0x205c306d = 0);
    NONFAILING(*(uint8_t*)0x205c306e = 0);
    NONFAILING(*(uint8_t*)0x205c306f = 0);
    NONFAILING(*(uint8_t*)0x205c3070 = 0);
    NONFAILING(*(uint8_t*)0x205c3071 = 0);
    NONFAILING(*(uint64_t*)0x205c3072 = htobe64(0));
    NONFAILING(*(uint64_t*)0x205c307a = htobe64(1));
    NONFAILING(*(uint8_t*)0x205c3082 = 0);
    NONFAILING(*(uint8_t*)0x205c3083 = 0);
    NONFAILING(*(uint8_t*)0x205c3084 = 0);
    NONFAILING(*(uint8_t*)0x205c3085 = 0);
    NONFAILING(*(uint8_t*)0x205c3086 = 0);
    NONFAILING(*(uint8_t*)0x205c3087 = 0);
    NONFAILING(*(uint8_t*)0x205c3088 = 0);
    NONFAILING(*(uint8_t*)0x205c3089 = 0);
    NONFAILING(*(uint8_t*)0x205c308a = 0);
    NONFAILING(*(uint8_t*)0x205c308b = 0);
    NONFAILING(*(uint8_t*)0x205c308c = 0);
    NONFAILING(*(uint8_t*)0x205c308d = 0);
    NONFAILING(*(uint8_t*)0x205c308e = 0);
    NONFAILING(*(uint8_t*)0x205c308f = 0);
    NONFAILING(*(uint8_t*)0x205c3090 = 0);
    NONFAILING(*(uint8_t*)0x205c3091 = 0);
    NONFAILING(*(uint16_t*)0x205c3092 = htobe16(0x4e20 + procid * 4));
    NONFAILING(*(uint16_t*)0x205c3094 = htobe16(0x4e21 + procid * 4));
    NONFAILING(*(uint32_t*)0x205c3096 = 0x42424242);
    NONFAILING(*(uint32_t*)0x205c309a = 0x42424242);
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x205c309e, 0, 0, 1));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x205c309e, 0, 1, 3));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x205c309e, 0x17, 4, 4));
    NONFAILING(*(uint8_t*)0x205c309f = 0x2c);
    NONFAILING(*(uint16_t*)0x205c30a0 = htobe16(7));
    NONFAILING(*(uint16_t*)0x205c30a2 = 0);
    NONFAILING(*(uint16_t*)0x205c30a4 = htobe16(0x6f76));
    NONFAILING(*(uint8_t*)0x205c30a6 = 5);
    NONFAILING(*(uint8_t*)0x205c30a7 = 6);
    NONFAILING(*(uint32_t*)0x205c30a8 = htobe32(4));
    NONFAILING(*(uint8_t*)0x205c30ac = 5);
    NONFAILING(*(uint8_t*)0x205c30ad = 0x26);
    NONFAILING(*(uint32_t*)0x205c30ae = htobe32(0x800));
    NONFAILING(*(uint32_t*)0x205c30b2 = htobe32(9));
    NONFAILING(*(uint32_t*)0x205c30b6 = htobe32(1));
    NONFAILING(*(uint32_t*)0x205c30ba = htobe32(0x1f));
    NONFAILING(*(uint32_t*)0x205c30be = htobe32(0x3d));
    NONFAILING(*(uint32_t*)0x205c30c2 = htobe32(5));
    NONFAILING(*(uint32_t*)0x205c30c6 = htobe32(0x10001));
    NONFAILING(*(uint32_t*)0x205c30ca = htobe32(1));
    NONFAILING(*(uint32_t*)0x205c30ce = htobe32(0x101));
    NONFAILING(*(uint8_t*)0x205c30d2 = 2);
    NONFAILING(*(uint8_t*)0x205c30d3 = 4);
    NONFAILING(*(uint16_t*)0x205c30d4 = 0xac1);
    NONFAILING(*(uint8_t*)0x205c30d6 = 0xfe);
    NONFAILING(*(uint8_t*)0x205c30d7 = 2);
    NONFAILING(*(uint8_t*)0x205c30d8 = 0);
    NONFAILING(*(uint8_t*)0x205c30d9 = 0x13);
    NONFAILING(*(uint8_t*)0x205c30da = 0x12);
    NONFAILING(memcpy(
        (void*)0x205c30db,
        "\x40\x08\x07\xe3\xee\xe9\xb1\x73\xb4\x08\x11\x5e\xf4\x5c\x5e\x18",
        16));
    NONFAILING(*(uint8_t*)0x205c30eb = 3);
    NONFAILING(*(uint8_t*)0x205c30ec = 3);
    NONFAILING(*(uint8_t*)0x205c30ed = 6);
    struct csum_inet csum_1;
    csum_inet_init(&csum_1);
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x205c3012, 16));
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x205c3022, 16));
    uint32_t csum_1_chunk_2 = 0x5c000000;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 4);
    uint32_t csum_1_chunk_3 = 0x6000000;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 4);
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x205c3092, 92));
    NONFAILING(*(uint16_t*)0x205c30a2 = csum_inet_digest(&csum_1));
    syscall(__NR_write, r[0], 0x205c3000, 0xee);
    break;
  case 3:
    syscall(__NR_read, r[0], 0x20508f13, 0);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(4);
}

int main()
{
  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();
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}