// https://syzkaller.appspot.com/bug?id=401730da81cc65b97da6fa48aa9c0d392463f1b5
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.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 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);
}

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 bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);

  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

static int inject_fault(int nth)
{
  int fd;
  char buf[16];

  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exitf("failed to open /proc/thread-self/fail-nth");
  sprintf(buf, "%d", nth + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exitf("failed to write /proc/thread-self/fail-nth");
  return fd;
}

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;
      }
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 2, 2, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    NONFAILING(*(uint64_t*)0x20000100 = 0);
    NONFAILING(*(uint16_t*)0x20000108 = 2);
    NONFAILING(*(uint16_t*)0x2000010a = htobe16(0));
    NONFAILING(*(uint32_t*)0x2000010c = htobe32(0x7f000001));
    NONFAILING(*(uint8_t*)0x20000110 = 0);
    NONFAILING(*(uint8_t*)0x20000111 = 0);
    NONFAILING(*(uint8_t*)0x20000112 = 0);
    NONFAILING(*(uint8_t*)0x20000113 = 0);
    NONFAILING(*(uint8_t*)0x20000114 = 0);
    NONFAILING(*(uint8_t*)0x20000115 = 0);
    NONFAILING(*(uint8_t*)0x20000116 = 0);
    NONFAILING(*(uint8_t*)0x20000117 = 0);
    NONFAILING(*(uint16_t*)0x20000118 = 2);
    NONFAILING(*(uint16_t*)0x2000011a = htobe16(0));
    NONFAILING(*(uint32_t*)0x2000011c = htobe32(0x4494e18));
    NONFAILING(*(uint8_t*)0x20000120 = 0);
    NONFAILING(*(uint8_t*)0x20000121 = 0);
    NONFAILING(*(uint8_t*)0x20000122 = 0);
    NONFAILING(*(uint8_t*)0x20000123 = 0);
    NONFAILING(*(uint8_t*)0x20000124 = 0);
    NONFAILING(*(uint8_t*)0x20000125 = 0);
    NONFAILING(*(uint8_t*)0x20000126 = 0);
    NONFAILING(*(uint8_t*)0x20000127 = 0);
    NONFAILING(*(uint16_t*)0x20000128 = 2);
    NONFAILING(*(uint16_t*)0x2000012a = htobe16(0));
    NONFAILING(*(uint32_t*)0x2000012c = htobe32(0));
    NONFAILING(*(uint8_t*)0x20000130 = 0);
    NONFAILING(*(uint8_t*)0x20000131 = 0);
    NONFAILING(*(uint8_t*)0x20000132 = 0);
    NONFAILING(*(uint8_t*)0x20000133 = 0);
    NONFAILING(*(uint8_t*)0x20000134 = 0);
    NONFAILING(*(uint8_t*)0x20000135 = 0);
    NONFAILING(*(uint8_t*)0x20000136 = 0);
    NONFAILING(*(uint8_t*)0x20000137 = 0);
    NONFAILING(*(uint16_t*)0x20000138 = 0x126);
    NONFAILING(*(uint16_t*)0x2000013a = 0);
    NONFAILING(*(uint64_t*)0x20000140 = 0);
    NONFAILING(*(uint64_t*)0x20000148 = 0);
    NONFAILING(*(uint16_t*)0x20000150 = 0);
    NONFAILING(*(uint64_t*)0x20000158 = 0x20000000);
    NONFAILING(memcpy(
        (void*)0x20000000,
        "\x6c\x6f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        16));
    NONFAILING(*(uint64_t*)0x20000160 = 0);
    NONFAILING(*(uint64_t*)0x20000168 = 0);
    NONFAILING(*(uint16_t*)0x20000170 = 0);
    write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
    write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
    inject_fault(0);
    syscall(__NR_ioctl, r[0], 0x890b, 0x20000100);
    break;
  }
}

void loop()
{
  execute(2);
}

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