// https://syzkaller.appspot.com/bug?id=23b42017412e73fb730cffe0826ecc55030f8583
// 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 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 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");
}

#define KMEMLEAK_FILE "/sys/kernel/debug/kmemleak"

static const char* setup_leak()
{
  if (!write_file(KMEMLEAK_FILE, "scan=off")) {
    if (errno == EBUSY)
      return "KMEMLEAK disabled: increase CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE"
             " or unset CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF";
    return "failed to write(kmemleak, \"scan=off\")";
  }
  if (!write_file(KMEMLEAK_FILE, "scan"))
    return "failed to write(kmemleak, \"scan\")";
  sleep(5);
  if (!write_file(KMEMLEAK_FILE, "scan"))
    return "failed to write(kmemleak, \"scan\")";
  if (!write_file(KMEMLEAK_FILE, "clear"))
    return "failed to write(kmemleak, \"clear\")";
  return NULL;
}

static void check_leaks(void)
{
  int fd = open(KMEMLEAK_FILE, O_RDWR);
  if (fd == -1)
    exit(1);
  uint64_t start = current_time_ms();
  if (write(fd, "scan", 4) != 4)
    exit(1);
  sleep(1);
  while (current_time_ms() - start < 4 * 1000)
    sleep(1);
  if (write(fd, "scan", 4) != 4)
    exit(1);
  static char buf[128 << 10];
  ssize_t n = read(fd, buf, sizeof(buf) - 1);
  if (n < 0)
    exit(1);
  int nleaks = 0;
  if (n != 0) {
    sleep(1);
    if (write(fd, "scan", 4) != 4)
      exit(1);
    if (lseek(fd, 0, SEEK_SET) < 0)
      exit(1);
    n = read(fd, buf, sizeof(buf) - 1);
    if (n < 0)
      exit(1);
    buf[n] = 0;
    char* pos = buf;
    char* end = buf + n;
    while (pos < end) {
      char* next = strstr(pos + 1, "unreferenced object");
      if (!next)
        next = end;
      char prev = *next;
      *next = 0;
      fprintf(stderr, "BUG: memory leak\n%s\n", pos);
      *next = prev;
      pos = next;
      nleaks++;
    }
  }
  if (write(fd, "clear", 5) != 5)
    exit(1);
  close(fd);
  if (nleaks)
    exit(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 (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    check_leaks();
  }
}

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

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  socket$vsock_stream arguments: [
  //    domain: const = 0x28 (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_vsock_stream
  res = syscall(__NR_socket, /*domain=*/0x28ul, /*type=*/1ul, /*proto=*/0);
  if (res != -1)
    r[0] = res;
  //  bind$vsock_stream arguments: [
  //    fd: sock_vsock_stream (resource)
  //    addr: ptr[in, sockaddr_vm] {
  //      sockaddr_vm {
  //        svm_family: const = 0x28 (2 bytes)
  //        svm_reserved1: const = 0x0 (2 bytes)
  //        svm_port: vmaddr_port = 0x0 (4 bytes)
  //        svm_cid: union vmaddr_cid {
  //          any: const = 0xffffffff (4 bytes)
  //        }
  //        svm_zero: const = 0x0 (4 bytes)
  //      }
  //    }
  //    addrlen: len = 0x10 (8 bytes)
  //  ]
  *(uint16_t*)0x200000000440 = 0x28;
  *(uint16_t*)0x200000000442 = 0;
  *(uint32_t*)0x200000000444 = 0;
  *(uint32_t*)0x200000000448 = -1;
  *(uint32_t*)0x20000000044c = 0;
  syscall(__NR_bind, /*fd=*/r[0], /*addr=*/0x200000000440ul,
          /*addrlen=*/0x10ul);
  //  connect$vsock_stream arguments: [
  //    fd: sock_vsock_stream (resource)
  //    addr: ptr[in, sockaddr_vm] {
  //      sockaddr_vm {
  //        svm_family: const = 0x28 (2 bytes)
  //        svm_reserved1: const = 0x0 (2 bytes)
  //        svm_port: vmaddr_port = 0x2711 (4 bytes)
  //        svm_cid: union vmaddr_cid {
  //          local: const = 0x1 (4 bytes)
  //        }
  //        svm_zero: const = 0x0 (4 bytes)
  //      }
  //    }
  //    addrlen: len = 0x10 (8 bytes)
  //  ]
  *(uint16_t*)0x200000000000 = 0x28;
  *(uint16_t*)0x200000000002 = 0;
  *(uint32_t*)0x200000000004 = 0x2711;
  *(uint32_t*)0x200000000008 = 1;
  *(uint32_t*)0x20000000000c = 0;
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x200000000000ul,
          /*addrlen=*/0x10ul);
  //  listen arguments: [
  //    fd: sock (resource)
  //    backlog: int32 = 0xfffffffe (4 bytes)
  //  ]
  syscall(__NR_listen, /*fd=*/r[0], /*backlog=*/0xfffffffe);
  //  socket$vsock_stream arguments: [
  //    domain: const = 0x28 (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_vsock_stream
  res = syscall(__NR_socket, /*domain=*/0x28ul, /*type=*/1ul, /*proto=*/0);
  if (res != -1)
    r[1] = res;
  //  connect$vsock_stream arguments: [
  //    fd: sock_vsock_stream (resource)
  //    addr: ptr[in, sockaddr_vm] {
  //      sockaddr_vm {
  //        svm_family: const = 0x28 (2 bytes)
  //        svm_reserved1: const = 0x0 (2 bytes)
  //        svm_port: vmaddr_port = 0x0 (4 bytes)
  //        svm_cid: union vmaddr_cid {
  //          local: const = 0x1 (4 bytes)
  //        }
  //        svm_zero: const = 0x0 (4 bytes)
  //      }
  //    }
  //    addrlen: len = 0x10 (8 bytes)
  //  ]
  *(uint16_t*)0x200000000100 = 0x28;
  *(uint16_t*)0x200000000102 = 0;
  *(uint32_t*)0x200000000104 = 0;
  *(uint32_t*)0x200000000108 = 1;
  *(uint32_t*)0x20000000010c = 0;
  syscall(__NR_connect, /*fd=*/r[1], /*addr=*/0x200000000100ul,
          /*addrlen=*/0x10ul);
  //  accept4$unix arguments: [
  //    fd: sock_unix (resource)
  //    peer: nil
  //    peerlen: nil
  //    flags: accept_flags = 0x0 (8 bytes)
  //  ]
  //  returns sock_unix
  syscall(__NR_accept4, /*fd=*/r[0], /*peer=*/0ul, /*peerlen=*/0ul,
          /*flags=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  if ((reason = setup_leak()))
    printf("the reproducer may not work as expected: leak checking setup "
           "failed: %s\n",
           reason);
  loop();
  return 0;
}