// https://syzkaller.appspot.com/bug?id=7527ae92ab0b6495f037cfa703ac9dee9295c67c
// 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/ioctl.h>
#include <sys/mount.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 __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;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

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 void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

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;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  int iter = 0;
  DIR* dp = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  struct dirent* ep = 0;
  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);
    while (umount2(filename, MNT_DETACH) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
      if (umount2(filename, MNT_DETACH))
        exit(1);
    }
  }
  closedir(dp);
  for (int i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int 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 execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      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 < 5000) {
        continue;
      }
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0x0, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x11ul, 0x800000003ul, 0);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint16_t*)0x20000080 = 0x11);
  NONFAILING(memcpy((void*)0x20000082,
                    "\x00\x00\x01\x00\x00\x00\x00\x00\x08\x00\x44\x94\x4e\xeb"
                    "\xa7\x1a\x49\x76\xe2\x52\x92\x2c\xb1\x8f\x6e\x2e\x2a\xba"
                    "\x00\x00\x00\x01\x2e\x0b\x38\x36\x00\x54\x04\xb0\xe0\x30"
                    "\x1a\x4c\xe8\x75\xf2\xe3\xff\x5f\x16\x3e\xe3\x40\xb7\x67"
                    "\x95\x00\x80\x00\x00\x00\x00\x00\x00\x01\x01\x01\x3c\x58"
                    "\x11\x03\x9e\x15\x77\x50\x27\xec\xce\x66\xfd\x79\x2b\xbf"
                    "\x0e\x5b\xf5\xff\x1b\x08\x16\xf3\xf6\xdb\x1c\x00\x01\x00"
                    "\x00\x00\x00\x00\x00\x00\x49\x74\x00\x00\x00\x00\x00\x00"
                    "\x00\x06\xad\x8e\x5e\xcc\x32\x6d\x3a\x09\xff\xc2\xc6\x54",
                    126));
  syscall(__NR_bind, r[0], 0x20000080ul, 0x80ul);
  NONFAILING(*(uint32_t*)0x20000100 = 0x14);
  res = syscall(__NR_getsockname, r[0], 0x20000040ul, 0x20000100ul);
  if (res != -1)
    NONFAILING(r[1] = *(uint32_t*)0x20000044);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint64_t*)0x200007c0 = 0);
  NONFAILING(*(uint32_t*)0x200007c8 = 0);
  NONFAILING(*(uint64_t*)0x200007d0 = 0x20000780);
  NONFAILING(*(uint64_t*)0x20000780 = 0x20001440);
  NONFAILING(*(uint32_t*)0x20001440 = 0x150);
  NONFAILING(*(uint16_t*)0x20001444 = 0x24);
  NONFAILING(*(uint16_t*)0x20001446 = 0xf0b);
  NONFAILING(*(uint32_t*)0x20001448 = 0);
  NONFAILING(*(uint32_t*)0x2000144c = 0);
  NONFAILING(*(uint8_t*)0x20001450 = 0);
  NONFAILING(*(uint8_t*)0x20001451 = 0);
  NONFAILING(*(uint16_t*)0x20001452 = 0);
  NONFAILING(*(uint32_t*)0x20001454 = r[1]);
  NONFAILING(*(uint16_t*)0x20001458 = 0);
  NONFAILING(*(uint16_t*)0x2000145a = 0);
  NONFAILING(*(uint16_t*)0x2000145c = -1);
  NONFAILING(*(uint16_t*)0x2000145e = -1);
  NONFAILING(*(uint16_t*)0x20001460 = 0);
  NONFAILING(*(uint16_t*)0x20001462 = 0);
  NONFAILING(*(uint16_t*)0x20001464 = 8);
  NONFAILING(*(uint16_t*)0x20001466 = 1);
  NONFAILING(memcpy((void*)0x20001468, "red\000", 4));
  NONFAILING(*(uint16_t*)0x2000146c = 0x124);
  NONFAILING(*(uint16_t*)0x2000146e = 2);
  NONFAILING(*(uint16_t*)0x20001470 = 0x104);
  NONFAILING(*(uint16_t*)0x20001472 = 2);
  NONFAILING(memcpy(
      (void*)0x20001474,
      "\x12\xb5\x80\xbb\x51\x83\xd7\x4b\x7f\xbe\x9e\x72\x82\xab\x96\x45\x42\x9e"
      "\x67\x95\x91\x37\x35\x47\x06\x2b\x36\x11\x7a\xd1\xba\x67\x17\xe8\x7c\x01"
      "\xe3\x86\x96\x36\x92\xed\x76\x2d\xc5\xe0\x59\x8d\x04\x36\xb9\xcc\x30\x68"
      "\x74\xe1\x57\x43\x64\xbf\x17\xd6\xae\xe8\xda\xd4\x03\xcb\xa6\xc5\x12\xff"
      "\xa3\xfc\x97\x3a\x3c\xfd\x5d\x96\x15\xb1\x67\x74\xd5\xde\x66\x88\xb3\xbc"
      "\x38\x7b\xb7\xc1\x1e\x3b\x3b\x18\x84\x23\xf4\x91\x3e\xc3\x38\x17\x5b\xba"
      "\x14\xfa\x05\x26\x6d\xc4\x92\xa0\xc0\x3c\xbe\x95\xca\xe2\x7a\x9a\x21\xf5"
      "\x11\x56\x3a\x85\x88\x29\x6a\x1b\x33\xbb\xf9\x8b\xc0\x34\xb8\xad\x77\x7a"
      "\x90\xbb\x3d\x99\xe4\xa4\xf0\xf6\x9b\xa3\x73\xca\x2b\x19\xb5\xa2\xc2\xd0"
      "\xd5\x72\x3c\x5c\xfb\x02\x9e\x84\x1a\x79\xdd\xee\x27\x54\xd6\xa9\x8f\x51"
      "\x1e\xd3\xfd\x2a\xf3\xdf\xb0\x5d\x53\x0b\x67\x65\xa7\xfb\x3c\x7e\x60\xab"
      "\xb4\x2f\xa0\xac\xc4\x46\xb9\x9a\xfe\xeb\xcc\xf3\x4d\x87\xa6\x9d\xb2\x3c"
      "\x01\x96\x64\xb5\x60\xf6\x08\x3f\x24\x01\x2e\x6e\x88\x2c\x26\xc4\x42\x81"
      "\x5b\xfb\x52\x12\x88\xc8\x5a\xe4\xfd\xef\xcd\xee\x64\xfb\x94\xfe\xe2\xea"
      "\xd4\x6a\x2f\xc1",
      256));
  NONFAILING(*(uint16_t*)0x20001574 = 8);
  NONFAILING(*(uint16_t*)0x20001576 = 6);
  NONFAILING(*(uint32_t*)0x20001578 = -1);
  NONFAILING(*(uint16_t*)0x2000157c = 0x14);
  NONFAILING(*(uint16_t*)0x2000157e = 1);
  NONFAILING(*(uint32_t*)0x20001580 = 0);
  NONFAILING(*(uint32_t*)0x20001584 = 0);
  NONFAILING(*(uint32_t*)0x20001588 = 0);
  NONFAILING(*(uint8_t*)0x2000158c = 0);
  NONFAILING(*(uint8_t*)0x2000158d = 0);
  NONFAILING(*(uint8_t*)0x2000158e = 0);
  NONFAILING(*(uint8_t*)0x2000158f = 0);
  NONFAILING(*(uint64_t*)0x20000788 = 0x150);
  NONFAILING(*(uint64_t*)0x200007d8 = 1);
  NONFAILING(*(uint64_t*)0x200007e0 = 0);
  NONFAILING(*(uint64_t*)0x200007e8 = 0);
  NONFAILING(*(uint32_t*)0x200007f0 = 0);
  syscall(__NR_sendmsg, r[2], 0x200007c0ul, 0ul);
}
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);
  install_segv_handler();
  use_temporary_dir();
  loop();
  return 0;
}