// https://syzkaller.appspot.com/bug?id=ad374c1a1c899ec29813e4b2c6461078dfe5cb33
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

static unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  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);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  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 sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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 long syz_open_dev(volatile long a0, volatile long a1, volatile long 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) - 1));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

static int inject_fault(int nth)
{
  int fd;
  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exit(1);
  char buf[16];
  sprintf(buf, "%d", nth + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void setup_fault()
{
  static struct {
    const char* file;
    const char* val;
    bool fatal;
  } files[] = {
      {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
      {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
  };
  unsigned i;
  for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].file, files[i].val)) {
      if (files[i].fatal)
        exit(1);
    }
  }
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  NONFAILING(memcpy((void*)0x200003c0, "/dev/sg#\000", 9));
  syz_open_dev(0x200003c0, 0, 0);
  res = syz_open_dev(0, 0, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 0xaul, 1ul, 0);
  if (res != -1)
    r[1] = res;
  syscall(__NR_socketpair, 1ul, 5ul, 0, 0ul);
  res = syscall(__NR_fcntl, -1, 0ul, r[1]);
  if (res != -1)
    r[2] = res;
  syscall(__NR_ioctl, r[2], 0x8912, 0x400200ul);
  NONFAILING(*(uint8_t*)0x20000140 = 0);
  NONFAILING(*(uint8_t*)0x20000141 = 0);
  NONFAILING(*(uint8_t*)0x20000142 = 0);
  NONFAILING(*(uint8_t*)0x20000143 = 0);
  NONFAILING(*(uint8_t*)0x20000144 = 0);
  NONFAILING(*(uint8_t*)0x20000145 = 0);
  NONFAILING(*(uint8_t*)0x20000146 = 0);
  NONFAILING(*(uint8_t*)0x20000147 = 0);
  NONFAILING(*(uint8_t*)0x20000148 = 0);
  NONFAILING(*(uint8_t*)0x20000149 = 0);
  NONFAILING(*(uint8_t*)0x2000014a = 0);
  NONFAILING(*(uint8_t*)0x2000014b = 0);
  NONFAILING(*(uint8_t*)0x2000014c = 0);
  NONFAILING(*(uint8_t*)0x2000014d = 0);
  NONFAILING(*(uint8_t*)0x2000014e = 0);
  NONFAILING(*(uint8_t*)0x2000014f = 0);
  NONFAILING(*(uint8_t*)0x20000150 = 0);
  NONFAILING(*(uint8_t*)0x20000151 = 0);
  NONFAILING(*(uint8_t*)0x20000152 = 0);
  NONFAILING(*(uint8_t*)0x20000153 = 0);
  NONFAILING(*(uint8_t*)0x20000154 = 0);
  NONFAILING(*(uint8_t*)0x20000155 = 0);
  NONFAILING(*(uint8_t*)0x20000156 = 0);
  NONFAILING(*(uint8_t*)0x20000157 = 0);
  NONFAILING(*(uint8_t*)0x20000158 = 0);
  NONFAILING(*(uint8_t*)0x20000159 = 0);
  NONFAILING(*(uint8_t*)0x2000015a = 0);
  NONFAILING(*(uint8_t*)0x2000015b = 0);
  NONFAILING(*(uint8_t*)0x2000015c = 0);
  NONFAILING(*(uint8_t*)0x2000015d = 0);
  NONFAILING(*(uint8_t*)0x2000015e = 0);
  NONFAILING(*(uint8_t*)0x2000015f = 0);
  NONFAILING(*(uint16_t*)0x20000160 = 0);
  NONFAILING(*(uint32_t*)0x20000164 = 3);
  NONFAILING(*(uint32_t*)0x20000168 = 6);
  NONFAILING(*(uint64_t*)0x20000170 = 0);
  NONFAILING(*(uint64_t*)0x20000178 = 0);
  NONFAILING(*(uint32_t*)0x20000180 = 0);
  inject_fault(29);
  syscall(__NR_ioctl, r[0], 0xc0481273, 0x20000140ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  setup_fault();
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}