// https://syzkaller.appspot.com/bug?id=b23d95999136f86da560efe4adcfef2381a3b584
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <fcntl.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.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);
  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 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_procfs(uintptr_t a0, uintptr_t a1)
{

  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    NONFAILING(snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1));
  } else if (a0 == (uintptr_t)-1) {
    NONFAILING(
        snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1));
  } else {
    NONFAILING(snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s",
                        (int)a0, (char*)a1));
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

long r[46];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    r[1] = syscall(__NR_socket, 0xaul, 0x1ul, 0x0ul);
    break;
  case 2:
    NONFAILING(*(uint16_t*)0x20191fa4 = (uint16_t)0xa);
    NONFAILING(*(uint16_t*)0x20191fa6 = (uint16_t)0x214e);
    NONFAILING(*(uint32_t*)0x20191fa8 = (uint32_t)0x7fff);
    NONFAILING(*(uint64_t*)0x20191fac = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20191fb4 = (uint64_t)0x100000000000000);
    NONFAILING(*(uint32_t*)0x20191fbc = (uint32_t)0x7);
    NONFAILING(*(uint16_t*)0x20191fc0 = (uint16_t)0xa);
    NONFAILING(*(uint16_t*)0x20191fc2 = (uint16_t)0x234e);
    NONFAILING(*(uint32_t*)0x20191fc4 = (uint32_t)0x80);
    NONFAILING(*(uint8_t*)0x20191fc8 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fc9 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fca = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fcb = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fcc = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fcd = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fce = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fcf = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fd0 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fd1 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fd2 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fd3 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fd4 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fd5 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fd6 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20191fd7 = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x20191fd8 = (uint32_t)0xfffffffffffff5ff);
    NONFAILING(*(uint16_t*)0x20191fdc = (uint16_t)0x1);
    NONFAILING(*(uint32_t*)0x20191fe0 = (uint32_t)0x3ff);
    NONFAILING(*(uint32_t*)0x20191fe4 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20191fe8 = (uint32_t)0x3);
    NONFAILING(*(uint32_t*)0x20191fec = (uint32_t)0x1fffe00);
    NONFAILING(*(uint32_t*)0x20191ff0 = (uint32_t)0x64);
    NONFAILING(*(uint32_t*)0x20191ff4 = (uint32_t)0x4);
    NONFAILING(*(uint32_t*)0x20191ff8 = (uint32_t)0x9);
    NONFAILING(*(uint32_t*)0x20191ffc = (uint32_t)0x101);
    r[37] = syscall(__NR_setsockopt, r[1], 0x29ul, 0xd2ul, 0x20191fa4ul,
                    0x5cul);
    break;
  case 3:
    NONFAILING(memcpy((void*)0x20bb8000, "\x6e\x65\x74\x2f\x69\x70\x36"
                                         "\x5f\x6d\x72\x5f\x63\x61\x63"
                                         "\x68\x65\x00",
                      17));
    r[39] = syz_open_procfs(0x0ul, 0x20bb8000ul);
    break;
  case 4:
    r[40] = syscall(__NR_pread64, r[39], 0x20caef7bul, 0x0ul, 0x4cul);
    break;
  case 5:
    NONFAILING(*(uint64_t*)0x20917fb0 = (uint64_t)0x20131f47);
    NONFAILING(*(uint64_t*)0x20917fb8 = (uint64_t)0x6);
    NONFAILING(*(uint64_t*)0x20917fc0 = (uint64_t)0x20a87f2b);
    NONFAILING(*(uint64_t*)0x20917fc8 = (uint64_t)0x62);
    r[45] = syscall(__NR_readv, r[39], 0x20917fb0ul, 0x2ul);
    break;
  }
  return 0;
}

void loop()
{
  long i;
  pthread_t th[12];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 6; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 6; i++) {
    pthread_create(&th[6 + i], 0, thr, (void*)i);
    if (rand() % 2)
      usleep(rand() % 10000);
  }
  usleep(rand() % 100000);
}

int main()
{
  install_segv_handler();
  use_temporary_dir();
  loop();
  return 0;
}