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bash bug with root account

From: westlake
Subject: bash bug with root account
Date: Wed, 10 Jul 2019 04:01:35 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1

System: linux 64-bit (debian stable, latest release buster)
Bash version: GNU bash, version 5.0.3(1)-release (x86_64-pc-linux-gnu)

This bug occurs with the root account,

If a normal user types "su -l<enter>" and issues this "ls" statement,

ls -ld .!(?(.))

the output is without error. (the output lists all dot items with the exception of the annoying literals "." and "..")

If "su<enter>" (without the -l), is given instead, then "!" is taken to be something else as though I am attempting to fire up a bash history command (eg: "!100" to run the 100th command from bash's history list)

The error with ls -ld .!(?(.)) after doing "su<enter>"
"bash: !: event not found"

I could run this command in any directory without any issue, the error only occurs when entering the root account in bash with "su<enter>" from a normal user account.

I'm not sure if this is entirely the fault of bash, but "ps" shows that the shell being used after typing "su" is bash.

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