fileman.c example. Error free(): double free detected in tcache 2

[Morphlng]

Error Description

So I'm using rl_attempted_completion_function to add my own keyword completion, but ever since that the filepath completion doesn't work as expected, it will crash with free(): double free detected in tcache 2. I thought it was my problem, so I tried the fileman.c given in the example, but it ended up the same.
Comment out the binding to rl_attempted_completion_function, then it will work normally. So I guess there's something wrong with executing that function.

How to trigger

If you input ./ <tab>, then it will crash, but if you quote the path it works, e.g "/usr <tab>, it will show /usr/lib.

Sysinfo

System: Lubuntu 20.04
GCC Version: 9.3.0

[troglobit]

Thank you for the report.