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    Subject[PATCH AUTOSEL 5.4 022/130] rcutorture: Prevent hangs for invalid arguments
    Date
    From: "Paul E. McKenney" <paulmck@kernel.org>

    [ Upstream commit 4994684ce10924a0302567c315c91b0a64eeef46 ]

    If an rcutorture torture-test run is given a bad kvm.sh argument, the
    test will complain to the console, which is good. What is bad is that
    from the user's perspective, it will just hang for the time specified
    by the --duration argument. This commit therefore forces an immediate
    kernel shutdown if a rcu_torture_init()-time error occurs, thus avoiding
    the appearance of a hang. It also forces a console splat in this case
    to clearly indicate the presence of an error.

    Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    kernel/rcu/rcutorture.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
    index 3c9feca1eab17..27f0c48f46f4e 100644
    --- a/kernel/rcu/rcutorture.c
    +++ b/kernel/rcu/rcutorture.c
    @@ -2347,7 +2347,6 @@ rcu_torture_init(void)
    for (i = 0; i < ARRAY_SIZE(torture_ops); i++)
    pr_cont(" %s", torture_ops[i]->name);
    pr_cont("\n");
    - WARN_ON(!IS_MODULE(CONFIG_RCU_TORTURE_TEST));
    firsterr = -EINVAL;
    cur_ops = NULL;
    goto unwind;
    @@ -2507,6 +2506,10 @@ rcu_torture_init(void)
    unwind:
    torture_init_end();
    rcu_torture_cleanup();
    + if (shutdown_secs) {
    + WARN_ON(!IS_MODULE(CONFIG_RCU_TORTURE_TEST));
    + kernel_power_off();
    + }
    return firsterr;
    }

    --
    2.27.0
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