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From: Martijn Dekker <martijn@inlv.org>
Newsgroups: gnu.bash.bug
Subject: Spurious recursive trap invocation warning
Date: Sun, 29 Dec 2019 19:34:46 +0000
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Xref: csiph.com gnu.bash.bug:15787

The current git version of bash (at least on x86_64-apple-darwin18.7.0) 
gives a spurious warning about a recursive trap invocation when running 
the following more than once on an interactive shell. The trap unsets 
itself before resending the signal, so there should be no recursive 
invocation.

bash-5.0$ echo $BASH_VERSION
5.0.11(1)-maint
bash-5.0$ trap 'echo int; trap - INT; kill -s INT $$' INT; kill -s INT $$
int

bash-5.0$ trap 'echo int; trap - INT; kill -s INT $$' INT; kill -s INT $$
bash: warning: run_pending_traps: recursive invocation while running 
trap for signal 2
int

bash-5.0$ trap 'echo int; trap - INT; kill -s INT $$' INT; kill -s INT $$
bash: warning: run_pending_traps: recursive invocation while running 
trap for signal 2
int

Thanks and happy new year,

- M.

-- 
modernish -- harness the shell
https://github.com/modernish/modernish