From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41F833659E8; Tue, 21 Jul 2026 00:38:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784594316; cv=none; b=L1u7j2d0wWO6NoWeLehkHOOuvn1ReeDZFR942+3Vb0W/IQScWw6WZTHPZKedy+zpL3CP6LO5jllyq33Il+YmL8GrPI+4XUxJOKZRygh56VH+ENO2lyJk6Y/bQW0TMlJclUimJlteybeGwNXygqha2R4hbt2tuCugwrkCSYZxXZc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784594316; c=relaxed/simple; bh=jBddrH4ZJlWSqb48y2KqI+9vkGOcIvkKn1uFlDMLDN0=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=MYa4BLhWTgO79EBdvWI7VHepwDVL8/0GkRZKi94IJ9xcEaaqlFzNWdxWSuEbX9DSAXWGGu7LmYviIaSrBzAfFX69WrKyG+PawMdXGQreoYvmmaQzxoZukNc1iiRICglw25pswmI4Gc2m1okxz6YySlaG9LyMzZqb5x3RpTkYcDo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=heTHd6jQ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="heTHd6jQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 664151F000E9; Tue, 21 Jul 2026 00:38:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784594314; bh=HWYzSSvEdfLM5OpyP97q8ZolkKLSQ8fjHRgAnnAJoWQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=heTHd6jQTTuFpcKXP+VjDTuE4fp3Om4KiJr37BEVSYbptxVxJn2rQAdpOdgGFOovX h5XTY7gbuOMsw68Y7tf/b5/5ORDbncvRydX2XMJ7lU2x32N7h/Nubd4Vuim3GwnvGs u6CocT9OQsLyoEd9xp0/Cfvojx7Amfu/MyuxPUxDzRq/u40ph34v1m8Y7vmJl2wQdl L0qjA+oXRwnOjpQpNfaEnWpVxNb3S3JCUzrnnx6PxC1Pnn5YhbSiNTMIetdLnSJAJk M2h3ImEbFpA6oV40TggXhZ0FwPbutrOr+TtKmPMXDjeBJgI9xwM24+oXAbyVny2GAd jaIo125zrRnvQ== Date: Tue, 21 Jul 2026 09:38:30 +0900 From: Masami Hiramatsu (Google) To: Masami Hiramatsu (Google) Cc: kernel test robot , Steven Rostedt , , , , Shuah Khan , Subject: Re: [linus:master] [selftests/tracing] c5c413534d: kselftests-bpf.ftrace.ftracetest-ktap._instance_event_trigger_-_test_poll_wait_on_histogram.fail Message-Id: <20260721093830.bb1d57a6a6d30c3f8651a292@kernel.org> In-Reply-To: <20260720232952.94b33d59eddb69cf6457ded4@kernel.org> References: <202607161651.ab0a5bf6-lkp@intel.com> <20260720232952.94b33d59eddb69cf6457ded4@kernel.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 20 Jul 2026 23:29:52 +0900 Masami Hiramatsu (Google) wrote: > On Thu, 16 Jul 2026 22:30:11 +0800 > kernel test robot wrote: > > > > > > > > > Hello, > > > > in fact, we found below two test cases randomly failed upon c5c413534d, while > > keep succeed on parent: > > > > ========================================================================================= > > tbox_group/testcase/rootfs/kconfig/compiler/group: > > igk-rpl-d04/kselftests-bpf/debian-13-x86_64-20250902.cgz/x86_64-rhel-9.4-bpf/gcc-14/ftrace > > > > 22a78be4123dce81 c5c413534d40eb4c982f1794e62 > > ---------------- --------------------------- > > fail:runs %reproduction fail:runs > > | | | > > :31 52% 16:32 kselftests-bpf.ftrace.ftracetest-ktap._instance_event_trigger_-_test_poll_wait_on_histogram.fail > > :31 29% 9:32 kselftests-bpf.ftrace.ftracetest-ktap.event_trigger_-_test_poll_wait_on_histogram.fail > > > > > > > > kernel test robot noticed "kselftests-bpf.ftrace.ftracetest-ktap._instance_event_trigger_-_test_poll_wait_on_histogram.fail" on: > > > > commit: c5c413534d40eb4c982f1794e62813f926aba747 ("selftests/tracing: Have trigger-hist-poll.tc use sched_process_exit") > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > > > [test failed on linux-next/master 49362394dad7df66c274c867a271394c10ca2bb8] > > Hmm, this seems like a scheduler (event) behavior is different from what > the test expected. > > Steve, I think we should use another deterministic events. I've sent a fix. https://lore.kernel.org/all/178459323652.354837.10711230683477156733.stgit@devnote2/ But this drops 2 checkpoints. I think we need to use another deterministic event, like trace_marker (but trace_marker does not support histogram trigger) Thanks, > > Thank you, > > -- > Masami Hiramatsu (Google) -- Masami Hiramatsu (Google)