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Wed, 17 Jun 2026 09:14:30 -0700 (PDT) Received: from [192.168.1.167] ([185.168.96.228]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4922fa510e7sm208072825e9.7.2026.06.17.09.14.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 09:14:29 -0700 (PDT) Message-ID: <011cf25d84525949547299c9fc179e7dfa33018e.camel@redhat.com> Subject: Re: [PATCH 0/3] rv/reactors: fix lockdep warning and add KUnit tests From: Gabriele Monaco To: Nam Cao , wen.yang@linux.dev Cc: linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 17 Jun 2026 18:14:27 +0200 In-Reply-To: <874ij16u6i.fsf@yellow.woof> References: <2bcfa0bda551c0e1ba137b728dbe7886ff5c2579.camel@redhat.com> <874ij16u6i.fsf@yellow.woof> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.2 (3.60.2-1.fc44) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-06-17 at 17:52 +0200, Nam Cao wrote: > Gabriele Monaco writes: > > Are those tests supposed to trigger this issue though? Under what > > configuration? > >=20 > > I reverted the lockdep fix and run the tests in vng on both x86_64 > > and arm64, both preempt_rt and not but I see no splat. > > Repeating the tests multiple times from debugfs also didn't seem to > > help. Both machines were relatively large (128 and 48 CPUs). > >=20 > > The config was the bare vng one with kunit built-in, lockdep and > > the reactors tests. > >=20 > > What am I missing? >=20 > I haven't tried to reproduce it, but seems quite rare. From the look > of it, adding some delay into the reactor function should make the > issue more easily reproducible. Yeah the tests should be doing that, but even increasing the delay didn't help. I should probably try on physical machines to have more likely interrupts but at least the tick should be running.