From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E47DAC433FE for ; Mon, 13 Sep 2021 08:11:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CA54260D42 for ; Mon, 13 Sep 2021 08:11:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237879AbhIMIMt (ORCPT ); Mon, 13 Sep 2021 04:12:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43374 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237869AbhIMIMq (ORCPT ); Mon, 13 Sep 2021 04:12:46 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA851C061760; Mon, 13 Sep 2021 01:11:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Zj9bDVh8bECevuh3HQ4f7aL+kfMosy058ZyQYs/papg=; b=lcO2BiA5Fd8VL1xe9MvMXEHx0w rkHg+B7zS01dliDC40Yb8MlXRuOACJ36VL/2WIDM5863mBT3TcGl3uCANsjvCrk7HRNcRTcGA+XBn v0dWdjYT9r8dc1typAVrUTzDL5PmPHtwjP8rWP3ojKpQvQW40qsI8mLL6ka/d47QChXc/AQORHlqA D1S7byoUL3xy5fUc16UxdWU2I2YUYnXRMOVg7A0Y2CE8fl7z1K/zsOj+mpoXC9GDDIcjFqtNUV/GK kWadPBi0BW8I2cgnAjAIVg4K5KxEIh7dYtdZQ3VBh9FBVEsCQtQMYQiGQi4HHlM19c2rKdBJOVmaP ulVwuDNg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mPh3Y-002mSL-PU; Mon, 13 Sep 2021 08:11:13 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 0F81530003A; Mon, 13 Sep 2021 10:11:10 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id A02B72BD296B7; Mon, 13 Sep 2021 10:11:10 +0200 (CEST) Date: Mon, 13 Sep 2021 10:11:10 +0200 From: Peter Zijlstra To: Hao Sun Cc: acme@kernel.org, linux-perf-users@vger.kernel.org, mingo@redhat.com, alexander.shishkin@linux.intel.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, jolsa@redhat.com, kafai@fb.com, kpsingh@kernel.org, linux-kernel@vger.kernel.org, mark.rutland@arm.com, namhyung@kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com Subject: Re: possible deadlock in __perf_event_task_sched_out Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 13, 2021 at 10:39:10AM +0800, Hao Sun wrote: > Hello, > > When using Healer to fuzz the latest Linux kernel, the following crash > was triggered. > > HEAD commit: 4b93c544e90e-thunderbolt: test: split up test cases > git tree: upstream > console output: > https://drive.google.com/file/d/1Gy99NMo9JxZF6dHPdxnnb91n_jPJUQnA/view?usp=sharing > kernel config: https://drive.google.com/file/d/1c0u2EeRDhRO-ZCxr9MP2VvAtJd6kfg-p/view?usp=sharing > > Sorry, I don't have a reproducer for this crash, hope the symbolized > report can help. > If you fix this issue, please add the following tag to the commit: This reads like a very badly configured VM, in part because the console output is partial. That first Call trace: is ex_handler_wrmsr_unsafe, but it is truncated, also the pr_warn_once() went missing. Please take more care in configuring your VM before sending out more bogus messages like this.