[LTP] shell: enable OOM protection by default

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On Aug 10, 2026, Andrea Cervesato wrote:
> shell: enable OOM protection by default

> +	if ! echo "$value" > "$path"; then
> +		tst_res TWARN "Can't adjust score"
> +	fi

Could this avoid reporting TWARN when CAP_SYS_RESOURCE is absent, as
tst_memutils.c does? Lowering oom_score_adj requires that capability, so
every unprivileged shell test now gets a warning result. The new self-test
itself reports TCONF but exits 36 because this TWARN remains counted.

> +	(
> +		TST_CHILD=1
> +		_tst_disable_oom_protection
> +		trap '_tst_cleanup_timer; _tst_write_results' EXIT
> +
> +		if [ "$TST_ALL_FILESYSTEMS" = 1 ]; then
> +			_tst_run_tcases_per_fs
> +		else
> +			_tst_run_iterations
> +		fi
> +	) &
> +
> +	wait $!
> +	ret=$?

How can the protected parent perform cleanup if this child is OOM-killed
or times out? TST_DO_CLEANUP and TST_MOUNT_FLAG are set only in the
subshell. On an abnormal child exit, the parent therefore reports TBROK
without calling TST_CLEANUP or unmounting a device mounted by
_prepare_device(), leaving external test state behind.

Verdict - Needs revision

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