// https://syzkaller.appspot.com/bug?id=dfbd1d86f62489c993cb817e69cc93fc8c146226
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <pthread.h>
#include <pwd.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/event.h>
#include <sys/ioctl.h>
#include <sys/ktrace.h>
#include <sys/mman.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <time.h>
#include <unistd.h>

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  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_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 void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

#define CAST

struct thread_t {
  int created, call;
  event_t ready, done;
};

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 (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void loop(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 9; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

void execute_call(int call)
{
  switch (call) {
  case 0:
    //  chroot arguments: [
    //    dir: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //    }
    //  ]
    NONFAILING(memcpy((void*)0x2000000000c0, "./file0\000", 8));
    NONFAILING(((intptr_t (*)(intptr_t))CAST(chroot))(/*dir=*/0x2000000000c0));
    break;
  case 1:
    //  fstatat arguments: [
    //    fd: fd_dir (resource)
    //    path: nil
    //    statbuf: ptr[out, stat] {
    //      stat {
    //        mode: int32 = 0x0 (4 bytes)
    //        dev: int32 = 0x0 (4 bytes)
    //        ino: int64 = 0x0 (8 bytes)
    //        nlink: int32 = 0x0 (4 bytes)
    //        uid: uid (resource)
    //        gid: gid (resource)
    //        rdev: int32 = 0x0 (4 bytes)
    //        atim: timespec {
    //          sec: intptr = 0x0 (8 bytes)
    //          nsec: intptr = 0x0 (8 bytes)
    //        }
    //        mtim: timespec {
    //          sec: intptr = 0x0 (8 bytes)
    //          nsec: intptr = 0x0 (8 bytes)
    //        }
    //        ctim: timespec {
    //          sec: intptr = 0x0 (8 bytes)
    //          nsec: intptr = 0x0 (8 bytes)
    //        }
    //        size: int64 = 0x0 (8 bytes)
    //        blocks: int64 = 0x0 (8 bytes)
    //        blksize: int32 = 0x0 (4 bytes)
    //        flags: int32 = 0x0 (4 bytes)
    //        gen: int32 = 0x0 (4 bytes)
    //        pad = 0x0 (4 bytes)
    //        birthtim: timespec {
    //          sec: intptr = 0x0 (8 bytes)
    //          nsec: intptr = 0x0 (8 bytes)
    //        }
    //      }
    //    }
    //    flag: at_flags = 0x4 (8 bytes)
    //  ]
    NONFAILING(((intptr_t (*)(intptr_t, intptr_t, intptr_t, intptr_t))CAST(
        fstatat))(/*fd=*/-1, /*path=*/0, /*statbuf=*/0x200000000140,
                  /*flag=AT_SYMLINK_FOLLOW*/ 4));
    break;
  case 2:
    //  sendmmsg arguments: [
    //    fd: sock (resource)
    //    mmsg: ptr[inout, send_mmsghdr] {
    //      send_mmsghdr {
    //        hdr: send_msghdr {
    //          msg_name: nil
    //          msg_namelen: len = 0x0 (4 bytes)
    //          pad = 0x0 (4 bytes)
    //          msg_iov: nil
    //          msg_iovlen: len = 0x0 (4 bytes)
    //          pad = 0x0 (4 bytes)
    //          msg_control: nil
    //          msg_controllen: bytesize = 0x0 (4 bytes)
    //          msg_flags: const = 0x0 (4 bytes)
    //        }
    //        len: const = 0x0 (4 bytes)
    //        pad = 0x0 (4 bytes)
    //      }
    //    }
    //    len: len = 0x38 (8 bytes)
    //    f: send_flags = 0x407 (8 bytes)
    //  ]
    NONFAILING(*(uint64_t*)0x200000002d40 = 0);
    NONFAILING(*(uint32_t*)0x200000002d48 = 0);
    NONFAILING(*(uint64_t*)0x200000002d50 = 0);
    NONFAILING(*(uint32_t*)0x200000002d58 = 0);
    NONFAILING(*(uint64_t*)0x200000002d60 = 0);
    NONFAILING(*(uint32_t*)0x200000002d68 = 0);
    NONFAILING(*(uint32_t*)0x200000002d6c = 0);
    NONFAILING(*(uint32_t*)0x200000002d70 = 0);
    NONFAILING(((intptr_t (*)(intptr_t, intptr_t, intptr_t, intptr_t))CAST(
        sendmmsg))(/*fd=*/0xffffff9c, /*mmsg=*/0x200000002d40, /*len=*/0x38,
                   /*f=MSG_NOSIGNAL|MSG_DONTROUTE|MSG_PEEK|MSG_OOB*/ 0x407));
    break;
  case 3:
    //  sysctl$vfs_nfs arguments: [
    //    name: ptr[in, ctl_vfs_nfs] {
    //      ctl_vfs_nfs {
    //        n1: const = 0xa (4 bytes)
    //        n2: const = 0x2 (4 bytes)
    //        n3: ctl_vfs_nfs_flags = 0x2 (4 bytes)
    //      }
    //    }
    //    namelen: bytesize4 = 0x3 (8 bytes)
    //    oldp: nil
    //    oldlenp: nil
    //    newp: nil
    //    newlen: len = 0x0 (8 bytes)
    //  ]
    NONFAILING(*(uint32_t*)0x200000000000 = 0xa);
    NONFAILING(*(uint32_t*)0x200000000004 = 2);
    NONFAILING(*(uint32_t*)0x200000000008 = 2);
    NONFAILING(((intptr_t (*)(intptr_t, intptr_t, intptr_t, intptr_t, intptr_t,
                              intptr_t))CAST(sysctl))(
        /*name=*/0x200000000000, /*namelen=*/3, /*oldp=*/0, /*oldlenp=*/0,
        /*newp=*/0, /*newlen=*/0));
    break;
  case 4:
    //  sysctl$kern arguments: [
    //    name: ptr[in, ctl_kern] {
    //      ctl_kern {
    //        n1: const = 0x1 (4 bytes)
    //        n2: ctl_kern_flags = 0x33 (4 bytes)
    //      }
    //    }
    //    namelen: bytesize4 = 0x2 (8 bytes)
    //    oldp: nil
    //    oldlenp: nil
    //    newp: nil
    //    newlen: len = 0x0 (8 bytes)
    //  ]
    NONFAILING(*(uint32_t*)0x200000000000 = 1);
    NONFAILING(*(uint32_t*)0x200000000004 = 0x33);
    NONFAILING(((intptr_t (*)(intptr_t, intptr_t, intptr_t, intptr_t, intptr_t,
                              intptr_t))CAST(sysctl))(
        /*name=*/0x200000000000, /*namelen=*/2, /*oldp=*/0, /*oldlenp=*/0,
        /*newp=*/0, /*newlen=*/0));
    break;
  case 5:
    //  socketpair$unix arguments: [
    //    domain: const = 0x1 (8 bytes)
    //    type: unix_socket_type = 0x1 (8 bytes)
    //    proto: const = 0x0 (1 bytes)
    //    fds: ptr[out, unix_pair] {
    //      unix_pair {
    //        fd0: sock_unix (resource)
    //        fd1: sock_unix (resource)
    //      }
    //    }
    //  ]
    NONFAILING(((intptr_t (*)(intptr_t, intptr_t, intptr_t, intptr_t))CAST(
        socketpair))(/*domain=*/1, /*type=SOCK_STREAM*/ 1, /*proto=*/0,
                     /*fds=*/0x200000000080));
    break;
  case 6:
    //  mprotect arguments: [
    //    addr: VMA[0x400000]
    //    len: len = 0x400000 (8 bytes)
    //    prot: mmap_prot = 0x4 (8 bytes)
    //  ]
    NONFAILING(((intptr_t (*)(intptr_t, intptr_t, intptr_t))CAST(mprotect))(
        /*addr=*/0x200000000000, /*len=*/0x400000, /*prot=PROT_EXEC*/ 4));
    break;
  case 7:
    //  sysctl$kern arguments: [
    //    name: ptr[in, ctl_kern] {
    //      ctl_kern {
    //        n1: const = 0x1 (4 bytes)
    //        n2: ctl_kern_flags = 0x59 (4 bytes)
    //      }
    //    }
    //    namelen: bytesize4 = 0x3 (8 bytes)
    //    oldp: ptr[inout, buffer] {
    //      buffer: {ee 8f 40 91 98 15 7e 3b 0d 48 2c d8 11 43 9e 57 ce 10 40 01
    //      16 e4 85 33 68 b7 85 8d d5 31 3a 55 26 7e ae 31 df de b4 69 5f 32 fe
    //      7b 7a d8 6f 86 b9 02 6d b9 0f 9b 45 d9 c0 df e6 f3 36 cd be d0 b1 e9
    //      50 3f b7 1d 22 c0 7e 97 98 8c b6 77 f6 e0 39 bd a8 06 b7 7d 27 04 00
    //      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00} (length 0x68)
    //    }
    //    oldlenp: ptr[inout, len] {
    //      len = 0x5b (8 bytes)
    //    }
    //    newp: nil
    //    newlen: len = 0xfffa (8 bytes)
    //  ]
    NONFAILING(*(uint32_t*)0x200000000000 = 1);
    NONFAILING(*(uint32_t*)0x200000000004 = 0x59);
    NONFAILING(
        memcpy((void*)0x200000000180,
               "\xee\x8f\x40\x91\x98\x15\x7e\x3b\x0d\x48\x2c\xd8\x11\x43\x9e"
               "\x57\xce\x10\x40\x01\x16\xe4\x85\x33\x68\xb7\x85\x8d\xd5\x31"
               "\x3a\x55\x26\x7e\xae\x31\xdf\xde\xb4\x69\x5f\x32\xfe\x7b\x7a"
               "\xd8\x6f\x86\xb9\x02\x6d\xb9\x0f\x9b\x45\xd9\xc0\xdf\xe6\xf3"
               "\x36\xcd\xbe\xd0\xb1\xe9\x50\x3f\xb7\x1d\x22\xc0\x7e\x97\x98"
               "\x8c\xb6\x77\xf6\xe0\x39\xbd\xa8\x06\xb7\x7d\x27\x04\x00\x00"
               "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
               104));
    NONFAILING(*(uint64_t*)0x200000000080 = 0x5b);
    NONFAILING(((intptr_t (*)(intptr_t, intptr_t, intptr_t, intptr_t, intptr_t,
                              intptr_t))CAST(sysctl))(
        /*name=*/0x200000000000, /*namelen=*/3, /*oldp=*/0x200000000180,
        /*oldlenp=*/0x200000000080, /*newp=*/0, /*newlen=*/0xfffa));
    break;
  case 8:
    //  bind$inet6 arguments: [
    //    fd: sock_in6 (resource)
    //    addr: nil
    //    addrlen: len = 0x0 (8 bytes)
    //  ]
    NONFAILING(((intptr_t (*)(intptr_t, intptr_t, intptr_t))CAST(bind))(
        /*fd=*/-1, /*addr=*/0, /*addrlen=*/0));
    break;
  }
}
int main(void)
{
  NONFAILING(((intptr_t (*)(intptr_t, intptr_t, intptr_t, intptr_t, intptr_t,
                            intptr_t))CAST(mmap))(
      /*addr=*/0x200000000000, /*len=*/0x1000000,
      /*prot=PROT_WRITE|PROT_READ*/ 3,
      /*flags=MAP_ANONYMOUS|MAP_FIXED|MAP_PRIVATE*/ 0x1012, /*fd=*/-1,
      /*offset=*/0));
  const char* reason;
  (void)reason;
  install_segv_handler();
  use_temporary_dir();
  loop();
  return 0;
}