z.NewFile error on badger.Open()

[balena-kentik]

Describe the bug

Sometimes a simple badger.Open() with default options returns error z.NewFile.

To Reproduce

Keep writing data, closing, reopening, writing data, etc...

A second look gave me the way to reproduce it:

• Just leave the dir state containing .mem files.

In this case, badger.Open() always return z.NewFile.

Expected behavior

No error. In fact, a second call to badger.Open() returns no error.

Screenshots

If applicable, add screenshots to help explain your problem.

Environment

• OS: macOS, Linux
• Language: Go
• Version: v4.7.0

Additional context

This portion of code here seems to be the root cause. So openMemTable can return mt, z.NewFile as per ref. But mt != nil in this case.

Other portions of the code make sense of it, like here.

[linear]

BGR-13 z.NewFile error on badger.Open()