// https://syzkaller.appspot.com/bug?id=1fbceba05f872c22b58c01d19b8536118cfef229
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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 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;
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;
  size_t i = 0;
  for (; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];
  if (length & 1)
    csum->acc += le16toh((uint16_t)data[length - 1]);
  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

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 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++) {
    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;
    }
  }
}

void execute_one(void)
{
  *(uint8_t*)0x20000180 = 1;
  *(uint8_t*)0x20000181 = 0x80;
  *(uint8_t*)0x20000182 = 0xc2;
  *(uint8_t*)0x20000183 = 0;
  *(uint8_t*)0x20000184 = 0;
  *(uint8_t*)0x20000185 = 0;
  *(uint8_t*)0x20000186 = 0xaa;
  *(uint8_t*)0x20000187 = 0xaa;
  *(uint8_t*)0x20000188 = 0xaa;
  *(uint8_t*)0x20000189 = 0xaa;
  *(uint8_t*)0x2000018a = 0xaa;
  *(uint8_t*)0x2000018b = 0;
  *(uint16_t*)0x2000018c = htobe16(0x800);
  STORE_BY_BITMASK(uint8_t, , 0x2000018e, 5, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x2000018e, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x2000018f, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, , 0x2000018f, 0, 2, 6);
  *(uint16_t*)0x20000190 = htobe16(0xb0);
  *(uint16_t*)0x20000192 = htobe16(0);
  *(uint16_t*)0x20000194 = htobe16(0);
  *(uint8_t*)0x20000196 = 0;
  *(uint8_t*)0x20000197 = 0x11;
  *(uint16_t*)0x20000198 = htobe16(0);
  *(uint8_t*)0x2000019a = 0xac;
  *(uint8_t*)0x2000019b = 0x14;
  *(uint8_t*)0x2000019c = 0x14;
  *(uint8_t*)0x2000019d = 0;
  *(uint32_t*)0x2000019e = htobe32(0xe0000001);
  *(uint16_t*)0x200001a2 = htobe16(0);
  *(uint16_t*)0x200001a4 = htobe16(0x4e22);
  *(uint16_t*)0x200001a6 = htobe16(0x9c);
  *(uint16_t*)0x200001a8 = htobe16(0);
  *(uint32_t*)0x200001aa = 1;
  *(uint32_t*)0x200001ae = 0;
  memcpy((void*)0x200001b2, "\xdb\x38\x69\xc0\x7f\x3b\xa9\x2d\x87\x36\x89\x5a"
                            "\x5d\x0f\x12\x59\xbb\xd9\xb8\x4e\x4c\xa0\xf2\x51"
                            "\xf3\x3d\x40\x8a\xef\xe0\xeb\x19",
         32);
  memcpy((void*)0x200001d2, "\x7d\xff\x0e\x53\x8e\x2f\xfa\xde\x75\x11\x54\xbd"
                            "\x3d\xd8\x1c\x2a\x28\xc6\x2e\x3b\x5b\x8a\x43\x92"
                            "\xf0\xec\xde\x9a\x91\x7c\x51\x51\xcb\xf0\xc1\xb8"
                            "\xd9\xc7\x03\xf9\x08\xf9\xa5\x86\x39\xe2\xa2\x7b",
         48);
  memcpy((void*)0x20000202, "\xa0\xb1\xce\xaf\xc7\x48\xd0\x6e\x41\x50\x85\x97"
                            "\xcc\x0e\xea\xed\x6d\x96\xc7\x3c\xf3\x95\x28\x59"
                            "\xcb\x7f\x84\x5e",
         28);
  memcpy((void*)0x2000021e,
         "\xa8\x81\x91\xda\x05\x54\x0c\x27\x0d\xc0\xe5\x78\xac\x9a\x75\xec",
         16);
  memcpy((void*)0x2000022e,
         "\xe9\xc9\xac\x9b\x95\xba\x1b\x33\xe5\x3d\xd7\xa5\x9f\x27\xa0\xd2",
         16);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x2000019a, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x2000019e, 4);
  uint16_t csum_1_chunk_2 = 0x1100;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
  uint16_t csum_1_chunk_3 = 0x9c00;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
  csum_inet_update(&csum_1, (const uint8_t*)0x200001a2, 156);
  *(uint16_t*)0x200001a8 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x2000018e, 20);
  *(uint16_t*)0x20000198 = csum_inet_digest(&csum_2);
}
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);
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}