// https://syzkaller.appspot.com/bug?id=af3a0728c8cbf6903ec2b0836441287cced00c1c
// 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 <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.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 <string.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 __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 execute_one();
extern unsigned long long procid;

static void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      execute_one();
      int fd;
      for (fd = 3; fd < 30; fd++)
        close(fd);
      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)
        continue;
      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 (__atomic_load_n(&running, __ATOMIC_RELAXED))
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    NONFAILING(memcpy(
        (void*)0x20000980,
        "\x2f\x00\x7e\x57\x4d\x00\x03\x30\x80\x90\x22\xcf\xde\x26\x55\x5d\xc9"
        "\xec\xfe\x19\x74\x40\x6e\xda\xd3\x83\x64\x78\x2d\x63\xb6\x61\x28\x54"
        "\xb9\xe4\x9d\xbd\xca\xef\x71\x81\x97\xe3\x7e\x87\x0a\x30\x8b\x1e\x3a"
        "\x79\x8f\xa7\x88\xa4\x6d\x30\x25\xef\x93\x3e\x51\x82\x8a\xb6\x75\x06"
        "\x4e\x2a\xdb\xe9\x12\x64\x23\xb4\xa7\x3d\x68\xfb\xe9\x9c\x6d\xb2\xf1"
        "\x60\xd4\x9c\xb6\xcc\xe7\x6c\x27\x28\x9a\x4f\x9d\x19\x73\x54\xaa\xa5"
        "\x86\x0d\x23\x83\xdf\x87\x52\x6b\xaa\x18\x4d\x90\xbb\x77\x29\x36\x64"
        "\x17\xbc\x33\xd7\x65\xe9\xbc\x2f\x88\x2a\x13\xf3\xa9\xc1\xf6\x06\x60"
        "\xbd\x4f\xd2\xfa\x31\xd2\xc0\xa7\x75\x24\x22\x89\xbc\xe0\x62\xd1\x0d"
        "\x24\xde\xd5\x40\x69\x18\xa6\x6b\x2c\x75\xc4\x3f\xe1\xff\x45\x8a\xe5"
        "\xcd\x9f\xec\x63\x03\x9b\xa5\xa7\xb6\x6a\x60\xed\xe5\xcc\xda\xbc\x7e"
        "\xe7\x76\x60\xef\x23\x58\xcc\xdf\xf0\x22\x26\x02\x13\x84\xb0\xc2\x35"
        "\xf1\x14\xed\x9a\xde\x92\x76\x7a\xec\xc2\x56\xac\xde\xb6\x10\xdf\x42"
        "\xe7\x16\x9f\x24\x03\x57\xf7\x35\xae\x5f\xe2\x90\x17\xe5\x1e\x27\x25"
        "\x2f\x48\xb9\x5b\xfb\xbb\x3a\x86\x55\x35\x29\x8b\xdc\x36\xd7\x1d\xb6"
        "\x35\xf4\x1c\x57\x77\x1d\xb7\x7a\xea\xff\x88\x3f\xeb\x3d\xc3\xcc\x24"
        "\xbd\x3c\x03\x6e\x39\x6a\xd3\xaf\x37\x94\x50\x58\x83\x9e\x81\x22\x70"
        "\xbc\x40\x90\x1f\xa6\x54\xe7\xcc\x32\x92\xa8\x2f\xc8\x0c\x37\x4d\xc0"
        "\x71\x42\xa1\xc2\xe9\xd3\xe2\x52\x8e\x4f\xda\xc3\x2b\xca\xef\xe9\x10"
        "\xeb\xd3\xb9\x48\xa3\xbf\xeb\xef\x5f\xa8\xd8\x24\x73\xc7\xfb\xf3\xec"
        "\x76\x3a\x1b\x61\x3d\xd7\x47\xd5\x29\xea\x70\xef\x02\x98\xff\xf5\x66"
        "\x16\x30\xb9\x9a\x79\xec\x82\x69\xaf\x9b\xe1\x78\xae\xca\x17\xfe\xfb"
        "\x14\xfd\x3d\x00\x97\x5a\x99\x9d\x79\xba\x89\x4d\xba\xe4\xc1\xa6\xef"
        "\x5f\x1e\x35\xaf\x57\xd8\x28\x78\x22\x6d\x07\xe6\x3a\x3f\x45\x96\x7e"
        "\x0e\xe8\x59\xbb\x6e\x0f\x3c\x66\xe6\x8c\x44\x52\x08\xbb\x32\xbb\x23"
        "\x42\x94\x8a\xa3\xf4\x13\xea\x98\x1d\xcf\x59\xc2\x73\x23\xf4\x94\x5e"
        "\x32\x5b\xa0\xe6\x9e\x43\x6e\x55\x43\x6a\x93\x24\xf5\xa4\x58\xc5\xac"
        "\xb6\x01\x10\x4c\xf2\xfc\x7a\xdc\x67\xa0\x66\x2f\x54\x99\xdc\x4f\x72"
        "\xfd\x4d\x8f\x4f\x68\xad\x5d\xa5\x2e\xd8\xc9\x29\xf7\x51\xf2\x8d\x9d"
        "\x63\xfa\x34\xb3\x5d\x4f\xcf\xe8\xc5\x48\xeb\x35\xe3\xa1\xd0\x8c\x07"
        "\x7e\x7d\x7e\xa6\x1e\x71\x6e\xaa\x6f\xc3\x42\x87\xd5\x86\xdc\xc0",
        526));
    res = syscall(__NR_openat, -1, 0x20000980, 0, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    NONFAILING(memcpy((void*)0x20000000, "/dev/ptmx", 10));
    syscall(__NR_openat, 0xffffffffffffff9c, 0x20000000, 0, 0);
    break;
  case 2:
    syscall(__NR_mprotect, 0x20000000, 0x800000, 4);
    break;
  case 3:
    NONFAILING(memcpy((void*)0x20000000, "\x7a\x31\x00\x00\x00", 5));
    res = syscall(__NR_openat, r[0], 0x20000000, 0x200002, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    syscall(__NR_read, r[1], 0x20000040, 0xe2);
    break;
  }
}

void execute_one()
{
  execute(5);
  collide = 1;
  execute(5);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  for (;;) {
    loop();
  }
}