v1.1.0-beta1: juicefs info failed on large file

[anglelLAQ]

What happened:

v1.1.0-beta1 社区版 juicefs 的 info 命令查询 大文件（50G）报错，具体如下：
执行命令
报错截图

报错文件所在路径的dump结果如下:
dump结果

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?

Environment:

• JuiceFS version (use juicefs --version) or Hadoop Java SDK version:
• Cloud provider or hardware configuration running JuiceFS:
• OS (e.g cat /etc/os-release):
• Kernel (e.g. uname -a):
• Object storage (cloud provider and region, or self maintained):
• Metadata engine info (version, cloud provider managed or self maintained):
• Network connectivity (JuiceFS to metadata engine, JuiceFS to object storage):
• Others: