// https://syzkaller.appspot.com/bug?id=fa6f8101b681771ea2e1247f70fd55e385110222
// 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 <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>

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 = 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 {
  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, 1000000);
}

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_ACQUIRE))
      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 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);
  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);
  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 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);
    }
  }
}

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;
  for (call = 0; call < 7; 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);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; 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 < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0xaul, 1ul, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint64_t*)0x200043c0 = 0;
    *(uint32_t*)0x200043c8 = 0;
    *(uint64_t*)0x200043d0 = 0x20000400;
    *(uint64_t*)0x20000400 = 0x20000180;
    *(uint64_t*)0x20000408 = 0x47;
    *(uint64_t*)0x20000410 = 0x20000240;
    *(uint64_t*)0x20000418 = 0x62;
    *(uint64_t*)0x20000420 = 0x200002c0;
    *(uint64_t*)0x20000428 = 0x16;
    *(uint64_t*)0x20000430 = 0x20000300;
    *(uint64_t*)0x20000438 = 0xe0;
    *(uint64_t*)0x200043d8 = 4;
    *(uint64_t*)0x200043e0 = 0;
    *(uint64_t*)0x200043e8 = 0;
    *(uint32_t*)0x200043f0 = 0;
    *(uint32_t*)0x200043f8 = 0;
    *(uint64_t*)0x20004400 = 0;
    *(uint32_t*)0x20004408 = 0;
    *(uint64_t*)0x20004410 = 0x20000800;
    *(uint64_t*)0x20000800 = 0x20000700;
    *(uint64_t*)0x20000808 = 0xcc;
    *(uint64_t*)0x20004418 = 1;
    *(uint64_t*)0x20004420 = 0;
    *(uint64_t*)0x20004428 = 0;
    *(uint32_t*)0x20004430 = 0;
    *(uint32_t*)0x20004438 = 0;
    *(uint64_t*)0x20004440 = 0;
    *(uint32_t*)0x20004448 = 0;
    *(uint64_t*)0x20004450 = 0x20000a00;
    *(uint64_t*)0x20000a00 = 0x20000940;
    *(uint64_t*)0x20000a08 = 2;
    *(uint64_t*)0x20000a10 = 0x20000980;
    *(uint64_t*)0x20000a18 = 0x32;
    *(uint64_t*)0x20000a20 = 0x200009c0;
    *(uint64_t*)0x20000a28 = 4;
    *(uint64_t*)0x20004458 = 3;
    *(uint64_t*)0x20004460 = 0;
    *(uint64_t*)0x20004468 = 0;
    *(uint32_t*)0x20004470 = 0;
    *(uint32_t*)0x20004478 = 0;
    *(uint64_t*)0x20004480 = 0;
    *(uint32_t*)0x20004488 = 0;
    *(uint64_t*)0x20004490 = 0x20000c40;
    *(uint64_t*)0x20000c40 = 0x20000b80;
    *(uint64_t*)0x20000c48 = 0x3b;
    *(uint64_t*)0x20000c50 = 0x20000bc0;
    *(uint64_t*)0x20000c58 = 0x53;
    *(uint64_t*)0x20000c60 = 0x200013c0;
    *(uint64_t*)0x20000c68 = 0x1000;
    *(uint64_t*)0x20004498 = 3;
    *(uint64_t*)0x200044a0 = 0;
    *(uint64_t*)0x200044a8 = 0;
    *(uint32_t*)0x200044b0 = 0;
    *(uint32_t*)0x200044b8 = 0;
    *(uint64_t*)0x200044c0 = 0;
    *(uint32_t*)0x200044c8 = 0;
    *(uint64_t*)0x200044d0 = 0x20000f00;
    *(uint64_t*)0x20000f00 = 0x20000dc0;
    *(uint64_t*)0x20000f08 = 0x3d;
    *(uint64_t*)0x20000f10 = 0x20000e00;
    *(uint64_t*)0x20000f18 = 0xe6;
    *(uint64_t*)0x200044d8 = 2;
    *(uint64_t*)0x200044e0 = 0;
    *(uint64_t*)0x200044e8 = 0;
    *(uint32_t*)0x200044f0 = 0;
    *(uint32_t*)0x200044f8 = 0;
    *(uint64_t*)0x20004500 = 0;
    *(uint32_t*)0x20004508 = 0;
    *(uint64_t*)0x20004510 = 0x200012c0;
    *(uint64_t*)0x200012c0 = 0x200023c0;
    *(uint64_t*)0x200012c8 = 0x1000;
    *(uint64_t*)0x200012d0 = 0x200010c0;
    *(uint64_t*)0x200012d8 = 0x5c;
    *(uint64_t*)0x20004518 = 2;
    *(uint64_t*)0x20004520 = 0;
    *(uint64_t*)0x20004528 = 0;
    *(uint32_t*)0x20004530 = 0;
    *(uint32_t*)0x20004538 = 0;
    syscall(__NR_recvmmsg, -1, 0x200043c0ul, 6ul, 0ul, 0ul);
    break;
  case 2:
    *(uint32_t*)0x20000000 = 1;
    syscall(__NR_setsockopt, r[0], 6, 0x13, 0x20000000ul, 4ul);
    break;
  case 3:
    *(uint16_t*)0x20000200 = 0xa;
    *(uint16_t*)0x20000202 = htobe16(0);
    *(uint32_t*)0x20000204 = htobe32(0);
    memset((void*)0x20000208, 0, 16);
    *(uint32_t*)0x20000218 = 0;
    syscall(__NR_connect, r[0], 0x20000200ul, 0x1cul);
    break;
  case 4:
    memcpy((void*)0x20000540, "tls\000", 4);
    syscall(__NR_setsockopt, r[0], 6, 0x1f, 0x20000540ul, 4ul);
    break;
  case 5:
    *(uint16_t*)0x20000040 = 0x303;
    *(uint16_t*)0x20000042 = 0x33;
    memcpy((void*)0x20000044, "\x2e\x99\x16\x92\x00\x20\xb9\xad", 8);
    memcpy((void*)0x2000004c,
           "\x53\x49\x9a\xdd\xa3\x7e\x5c\x14\x26\x5f\x29\x8f\x9f\x57\x22\xd7",
           16);
    memset((void*)0x2000005c, 0, 4);
    memcpy((void*)0x20000060, "\xc7\x91\xd3\x43\x04\xbb\x24\xeb", 8);
    syscall(__NR_setsockopt, r[0], 0x11a, 1, 0x20000040ul, 0x28ul);
    break;
  case 6:
    *(uint64_t*)0x20000080 = 0x200000c0;
    memset((void*)0x200000c0, 207, 1);
    *(uint64_t*)0x20000088 = 1;
    inject_fault(4);
    syscall(__NR_writev, r[0], 0x20000080ul, 0x27ful);
    break;
  }
}
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();
  loop();
  return 0;
}