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Tue, 23 Jan 2024 07:44:30 -0800 (PST) Received: from [10.5.0.2] ([45.88.220.198]) by smtp.gmail.com with ESMTPSA id v18-20020a05620a091200b00783534c512bsm3231784qkv.32.2024.01.23.07.44.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 Jan 2024 07:44:29 -0800 (PST) Message-ID: <0454a852-5e61-4181-b8cd-518e1cb45b58@joelfernandes.org> Date: Tue, 23 Jan 2024 10:44:27 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 7/7] sched/fair: Fair server interface Content-Language: en-US To: Daniel Bristot de Oliveira , Daniel Bristot de Oliveira Cc: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , linux-kernel@vger.kernel.org, Luca Abeni , Tommaso Cucinotta , Thomas Gleixner , Vineeth Pillai , Shuah Khan , Phil Auld , suleiman@google.com References: <26adad2378c8b15533e4f6216c2863341e587f57.1699095159.git.bristot@kernel.org> <20240119015513.GA2187855@google.com> <3f002616-0975-49b8-a2bf-04abd0446b95@redhat.com> From: Joel Fernandes In-Reply-To: <3f002616-0975-49b8-a2bf-04abd0446b95@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 1/22/2024 9:14 AM, Daniel Bristot de Oliveira wrote: > Interesting, does it keep any task hung? I am having a case where I see > a hung task, but I do not get the splat because the system freezes (printk > with rq_lock I guess)... I missed replying to this part of your email. We see it as a syzkaller report with splats, so it is not clear if a task was hung at the time of a splat. syzkaller runs in its own separate VM instance. The fun part is though, I found a way to do ftrace dump on it without having to pass any boot parameters (that's another issue that we can't pass it boot parameters). So we have that tool in our debug arsenal for these issues, thankfully. > It might be the same problem. True, possibly. thanks, - Joel