Re: [PATCH] kprobes: Fix to delay the kprobes jump optimization

[Steven Rostedt]

On Fri, 19 Feb 2021 10:33:36 -0800
"Paul E. McKenney" <paulmck@xxxxxxxxxx> wrote:

> commit 4f659bf04fc4610523544493d6db92fc8670b086
> Author: Paul E. McKenney <paulmck@xxxxxxxxxx>
> Date:   Fri Feb 12 16:20:40 2021 -0800
> 
>     softirq: Don't try waking ksoftirqd before it has been spawned
>     
>     If there is heavy softirq activity, the softirq system will attempt
>     to awaken ksoftirqd and will stop the traditional back-of-interrupt
>     softirq processing.  This is all well and good, but only if the
>     ksoftirqd kthreads already exist, which is not the case during early
>     boot, in which case the system hangs.
>     
>     One reproducer is as follows:
>     
>     tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 2 --configs "TREE03" --kconfig "CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y" --bootargs "threadirqs=1" --trust-make
>     
>     This commit therefore adds a couple of existence checks for ksoftirqd
>     and forces back-of-interrupt softirq processing when ksoftirqd does not
>     yet exist.  With this change, the above test passes.
>     
>     Reported-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
>     Reported-by: Uladzislau Rezki <urezki@xxxxxxxxx>
>     Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>

Hmm, I wonder if this is what patchwork picked up regarding the
reported-by.

And I checked, it did not add the "Signed-off-by" from you to Masami's
patch ;-)

The dangers of posting patches in threads of other patches :-/

-- Steve