// https://syzkaller.appspot.com/bug?id=61d80cc45077fcc43cec63681f58a989ec08dbf2
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.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>

#include <linux/futex.h>

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 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;
  for (i = 0; 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 {
  int state;
} event_t;

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

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

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

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 long syz_open_procfs(volatile long a0, volatile long a1)
{
  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    NONFAILING(snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1));
  } else if (a0 == -1) {
    NONFAILING(snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1));
  } else {
    NONFAILING(snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0,
                        (char*)a1));
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  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");
}

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 execute_one(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 11; 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);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

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;
    }
  }
}

#ifndef __NR_clock_getres
#define __NR_clock_getres 266
#endif
#ifndef __NR_clone
#define __NR_clone 120
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_openat
#define __NR_openat 295
#endif
#ifndef __NR_pipe
#define __NR_pipe 42
#endif
#ifndef __NR_read
#define __NR_read 3
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#ifndef __NR_write
#define __NR_write 4
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    syscall(__NR_socket, 2, 2, 3);
    break;
  case 1:
    syscall(__NR_ioctl, -1, 0x5432, 0x20000040);
    break;
  case 2:
    syscall(__NR_clock_getres, 0xf, 0);
    break;
  case 3:
    syscall(__NR_openat, 0xffffff9c, 0, 0xc0000, 0);
    break;
  case 4:
    syscall(__NR_ioctl, -1, 0x7003, 0);
    break;
  case 5:
    syscall(__NR_clone, 0x207ffd, 0, 0x99999999, 0, -1);
    break;
  case 6:
    NONFAILING(memcpy((void*)0x20000280, "/dev/loop#\000", 11));
    syz_open_dev(0x20000280, 6, 0x105082);
    break;
  case 7:
    res = syscall(__NR_pipe, 0x20000080);
    if (res != -1) {
      NONFAILING(r[0] = *(uint32_t*)0x20000080);
      NONFAILING(r[1] = *(uint32_t*)0x20000084);
    }
    break;
  case 8:
    NONFAILING(memcpy(
        (void*)0x20000a00,
        "\x8b\x62\x5c\xc3\xc7\x3c\x49\xd7\x00\x00\x00\x00\x00\x00\xed\xd3\xa4"
        "\x4a\xb3\xb1\xdf\x5e\x98\x68\x3a\x40\xb6\xd1\xa9\x65\x82\xee\x68\x62"
        "\x79\x71\x3f\xb6\x8c\x1e\x4d\xd8\x56\x47\x8a\x2f\x46\x71\x09\xf2\xb7"
        "\xf0\x08\x7f\x24\x78\x61\x37\xf0\x7a\x6e\x14\xb9\xac\xae\x26\xef\x60"
        "\xe6\x0b\x0c\x30\x01\x39\x36\xc5\x47\x1c\x08\x32\x8e\x45\x71\x06\x00"
        "\x10\x6b\x19\x8a\x76\x5c\xf9\x8c\x8c\x07\x46\xb6\x30\xb0\xda\x7f\x8b"
        "\xfe\x85\xf2\x7d\x53\x5d\xee\x3e\xe8\xc6\xe0\x74\x02\x00\xdf\x8a\xf3"
        "\x7d\xf2\xbe\x3f\xee\x83\x3b\x03\xbe\x78\xf8\x04\xe8\x6f\xab\xad\x81"
        "\x57\x5e\xd3\xc1\x96\x97\x85\x9e\x6f\xa4\x03\xad\x7f\x1b\x1f\xf2\xb6"
        "\x83\xbd\x8b\x6f\x9a\xce\xe9\xc7\xcd\x2c\xfe\x84\xfe\xc8\x46\x13\x75"
        "\x74\x08\x51\x1e\xb2\xef\xe9\xe9\xcb\xf6\x01\xf7\xa5\x7d\x1e\xc5\x5a"
        "\xfd\xb9\xb1\xd2\xf3\x05\x24\x8e\x32\x64\x0f\xf4\x72\xb5\x58\x87\x14"
        "\xb7\x3e\xb3\x7b\x5f\xf2\x9b\x7b\xad\x90\x08\xaa\x80\x1a\xb9\xee\xec"
        "\x7b\xfb\x2f\x8d\x57\xfb\x3f\x97\x16\xff\xbd\xd8\x92\x15\xff\x86\x67"
        "\x28\x4a\x6c\x31\x95\x1a\x43\xfe\x0a\x60\x6d\xbb\xe4\xd7\x71\x22\x21"
        "\xf1\x48\xef\xdf\xcb\x76\xda\xfd\x4f\x37\x00\xd6\x39\x84\xa7\x83\xbe"
        "\x3e\x52\x00\x2d\xb8\x69\x1a\xf0\x3a\x0b\x5f\x66\xfe\xaa\xf1\x8c\x50"
        "\xd9\xf4\xe4\x25\x27\x10\x64\x90\xd7\x39\xf6\x70\xc2\x0d\xf9\xe6\xe7"
        "\x0f\x0f\xd0\xcd\x4d\xea\xe0\x2c\x8e\xf0\x48\x88\x73\xd6\x7c\xfa\x61"
        "\x9b\x80\x28\x95\x31\xcb\xd1\x67\x62\x9f\x2f\xdd\x35\x40\xa5\x23\x3b"
        "\x9f\x80\x03\xc3\x3f\x79\xd7\xc0\x93\xc5\xb9\x6b\xd9\x41\xd9\x60\x1e"
        "\xa1\x18\xd4\x21\x96\x01\x8e\x04\x68\x90\x70\x8b\xc1\x5d\x75\x36\xd0"
        "\x5c\xb0\x15\x93\xf9\xcf\x2a\xc4\x09\x82\x29\xcf\xc6\x9d\x0d\x49\x69"
        "\x46\x5d\x45\x75\x99\x01\xa6\xac\xbb\x53\xbf\x23\x90\xfc\xb4\xc5\x30"
        "\x4d\x47\xf5\xc7\x49\xa2\x07\x10\x59\x4b\x06\x7b\x41\xd4\xcf\x69\x19"
        "\x62\xb3\xfa\x09\x8f\x14\x31\x47\xfb\xc4\x4f\x7d\xd0\xaf\xe4\x08\x01"
        "\x25\x80\x4f\x3a\x95\x74\x13\x91\xf2\xaf\x68\x93\x18\xac\x69\x67\xfb"
        "\xcf\x19\x32\xf5\x69\x2b\x1c\xf8\x0d\xd5\x42\x9d\xcb\x0a\x5e\x94\xba"
        "\x96\x61\xe5\xa4\x63",
        481));
    syscall(__NR_write, (intptr_t)r[1], 0x20000a00, 0xffffff5d);
    break;
  case 9:
    syscall(__NR_read, (intptr_t)r[0], 0x20000340, 0x151c3a26);
    break;
  case 10:
    NONFAILING(memcpy((void*)0x200000c0, "net/tcp6\000", 9));
    syz_open_procfs(0, 0x200000c0);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}