[LTP] [PATCH] Allow graceful subtest cleanup in shell tests

[Richard Palethorpe]

Hello,

Martin Doucha <mdoucha@suse.cz> writes:

> The new shell test timeout code sends SIGTERM to any subprocesses when
> the main script hits timeout. SIGTERM isn't handled by the LTP library
> which means that tools like netstress will be instantly killed without
> performing any cleanup. Handle SIGTERM like SIGINT in LTP library
> to allow graceful cleanup.
>
> Signed-off-by: Martin Doucha <mdoucha@suse.cz>

Merged with Petr's tag, thanks!

Possibly we should also print the signal that we received somehow.

> ---
>
> Note: The current lack of graceful cleanup causes random failures in shell
> tests which run the same tool many times (e.g. netstress). When the PID
> counter wraps around and the tool accidentally gets the same PID as another
> process that got killed by SIGTERM, the new test process will fail during IPC
> setup.
>
>  lib/tst_test.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/lib/tst_test.c b/lib/tst_test.c
> index b225ba082..1732fd058 100644
> --- a/lib/tst_test.c
> +++ b/lib/tst_test.c
> @@ -1568,6 +1568,7 @@ static int fork_testrun(void)
>  	int status;
>  
>  	SAFE_SIGNAL(SIGINT, sigint_handler);
> +	SAFE_SIGNAL(SIGTERM, sigint_handler);
>  
>  	alarm(results->timeout);
>  
> @@ -1579,6 +1580,7 @@ static int fork_testrun(void)
>  		tst_disable_oom_protection(0);
>  		SAFE_SIGNAL(SIGALRM, SIG_DFL);
>  		SAFE_SIGNAL(SIGUSR1, SIG_DFL);
> +		SAFE_SIGNAL(SIGTERM, SIG_DFL);
>  		SAFE_SIGNAL(SIGINT, SIG_DFL);
>  		SAFE_SETPGID(0, 0);
>  		testrun();
> @@ -1586,6 +1588,7 @@ static int fork_testrun(void)
>  
>  	SAFE_WAITPID(test_pid, &status, 0);
>  	alarm(0);
> +	SAFE_SIGNAL(SIGTERM, SIG_DFL);
>  	SAFE_SIGNAL(SIGINT, SIG_DFL);
>  
>  	if (tst_test->taint_check && tst_taint_check()) {
> -- 
> 2.37.3


-- 
Thank you,
Richard.