Re: [PATCH 1/4] selftests: livepatch: Introduce _remove_mod function

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Medium] `_remove_mod` uses `die()` which will terminate the script during cleanup operations.
--

commit 7b1591f4e5c3b351136e7fe2821eb2e15ae59ad0
Author: Marcos Paulo de Souza <mpdesouza@xxxxxxxx>

selftests: livepatch: Introduce _remove_mod function

This commit introduces the _remove_mod internal function to remove a loaded
module, intended to be used during cleanup when a testcase fails. It also
refactors unload_mod to use this new helper function.

> diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
> index 2bc50271729c6..3ec0b7962fc5c 100644
> --- a/tools/testing/selftests/livepatch/functions.sh
> +++ b/tools/testing/selftests/livepatch/functions.sh

[ ... ]

> @@ -241,9 +241,10 @@ function load_failing_mod() {
>  	log "$ret"
>  }
>  
> -# unload_mod(modname) - unload a kernel module
> +# _remove_mod(modname) - Internal function to remove a loaded module.
> +#                        Use unload_mod() instead, which also updates TEST_MODS tracking.
>  #	modname - module name to unload
> -function unload_mod() {
> +function _remove_mod() {
>  	local mod="$1"
>  
>  	# Wait for module reference count to clear ...
> @@ -261,6 +262,14 @@ function unload_mod() {
>  		die "failed to unload module $mod (/sys/module)"

[Severity: Medium]
The commit message notes this function will be used to remove loaded modules
when a testcase fails. If used in a cleanup path (such as a bash EXIT trap),
will calling die() here terminate the script prematurely?

If a module fails to unload (for example, if its refcount doesn't drop),
die() executes exit 1. Inside a trap, this aborts the rest of the
cleanup process. This could skip unloading any remaining modules and
prevent final cleanup operations like pop_config() from running, potentially
leaving kernel tracing persistently enabled and polluting the system state
for subsequent tests.

>  }

[ ... ]

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260524-livepatch-unload-on-fail-v1-0-7465de7f741d@xxxxxxxx?part=1