possibly corruption of user db

[flaix]

I met an issue today when I was trying to login Gitblit 1.9.2 using a local admin account. It failed login and prompt me invalid user name or password. Then I used another windows domain account logged in which was granted admin privilege. Then I found that the user list is empty. I logged into the server where gitblit is installed, and found that the users.conf is empty. I don't know why. Just found some exception in log about failed to read users.conf. I just upgraded to 1.9.3 right now. Hope this issue will never happen again. Please refer to below log:
2022-07-20 14:35:58 [ERROR] Failed to read D:\Program Files\gitblit-1.9.2\data\users.conf
org.eclipse.jgit.errors.ConfigInvalidException: Cannot read file D:\Program Files\gitblit-1.9.2\data\users.conf
at org.eclipse.jgit.storage.file.FileBasedConfig.load(FileBasedConfig.java:194)
at com.gitblit.ConfigUserService.read(ConfigUserService.java:885)
at com.gitblit.ConfigUserService.getUserModel(ConfigUserService.java:190)

Originally posted by @DonnyDong2008 in gitblit-org#1410 (comment)