I think I solved by removing the .bash_history file.
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https://bugs.launchpad.net/bugs/1910544
Title:
Bash search history vi-mode hang the process
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Public bug reported:
Hi,
Since a couple of weeks I found my self frustrated.
I usually use bash -o vi and use vi commands on the command line. To
search bask in the history i type 'Esc+/' and after thtat the search
string e.g. 'Esc+/python3'
Above search hangs the bash process with heave CPU
