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 57AD842CAE9; Mon, 20 Jul 2026 14:29:57 +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=1784557798; cv=none; b=JVTeInLXNQOULvGYEaXdzrizylX6QzRd7VX8PRnlel/vIUe5hC4bgpwsrNF0KjJcw8QVnWiBGplc/SmlVILYlwxT7ef0L4Mg8KmGt5miRYAxJcR6ttS8rniaKXBJgufvqbDhLgDgWYIFZGQLsi8XQ2ULVi0NYc+DlRkcQHn5VdE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784557798; c=relaxed/simple; bh=X61gKfZ16dz/eDfGeWsjCbEbo9rrjhHhVgQrQ3f1zdE=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=IBbCUNrYMkB3bHKWOllML9NXwg1Fb7GwOoLwapyAm5HbOIFt+FTxhyXkxVpudxRGGoUOpB8qF/7ne9cGpfu4CSW1XN57Gmnad1AN/lSEyjcaouPu8DqNU3ra3gx3BsjQlNwMUyyCjKWb76pq+oHnyy4HPipN+LtJnQTPvGSEYVk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZJOupfKs; 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="ZJOupfKs" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 043AC1F000E9; Mon, 20 Jul 2026 14:29:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784557797; bh=IBoDz8X8lKlcSxY2Wrt7FDQtjKk9jl7QKKFHHmDBqPQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=ZJOupfKssRpZbOVVDc2bH6py6VCJLbcwIP+8UMIzyWsdaMBIAbq0c2t2O/QVU1RsA RYIqllRmvXRVEAsIiLH/f0x6MRil4ZqMrS3ME7ppJiMuBwjGn9OLJ9iLTLuoqFwyig 3hNJsO3riynkME2ftgqTbMgTxUb0p1vSPF6h3hQuJXVQvnYiTR3B2j6bXSQ8Lcsy68 4IbvHXNIhIFT88m/3Gn+57HLH3+jHXEI8rYuDzAvBusinEglKXtAYcOzQ/cDYfwymX 77VRWdhqs5XEAjxOyRL9mSHIx/fMThTC0ZOs+aydAyp89esG2OIjW4GAzaoHOhCrG8 3MDT8Rx+UInzw== Date: Mon, 20 Jul 2026 23:29:52 +0900 From: Masami Hiramatsu (Google) To: kernel test robot Cc: Steven Rostedt , , , , Shuah Khan , Masami Hiramatsu , Subject: Re: [linus:master] [selftests/tracing] c5c413534d: kselftests-bpf.ftrace.ftracetest-ktap._instance_event_trigger_-_test_poll_wait_on_histogram.fail Message-Id: <20260720232952.94b33d59eddb69cf6457ded4@kernel.org> In-Reply-To: <202607161651.ab0a5bf6-lkp@intel.com> References: <202607161651.ab0a5bf6-lkp@intel.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-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 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. Thank you, -- Masami Hiramatsu (Google)