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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BDDF1C433FE for ; Wed, 16 Nov 2022 14:40:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233527AbiKPOkl (ORCPT ); Wed, 16 Nov 2022 09:40:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34024 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233254AbiKPOkb (ORCPT ); Wed, 16 Nov 2022 09:40:31 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 812FF32061 for ; Wed, 16 Nov 2022 06:40:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=vuj1ZMaLxnEHkBHYUzCsAoGtXzFPsOqUukrW2+e/14g=; b=nHgGLnB5H7e41SDA6soqChrfFr dtkv7F3s4Q8w294h7ZljnpCui3NPQLXwAl9Dc7ajvbThXkHlQgbNfBhFx2UV/F2uXPB32cwKP7JtQ DT+xkqPmzogul/oXmjBCWaBBlzGxfc2YEYnfGUdiS3VWgvW/IwNvqbWu2uAprjnnKwv28JhF4KzPa okTnGZqmP5JBVErOo6D7S+BvpUsWT8vOw+mYju/8JUBKhZFB38eP8RIFQgdxIddXy6QAsSZGO9ud8 bNOdZ7tI/EaxGUHK7TNNgjbHtbhM3kdQdzTDBDycqotG/VCooEQA918yoaXP1Km1CX0/w+tiUPTm0 Gh6hLIMA==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1ovJaa-00HUla-3W; Wed, 16 Nov 2022 14:40:32 +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 (4096 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 6CA9D300282; Wed, 16 Nov 2022 15:40:24 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 18B692BCD72CA; Wed, 16 Nov 2022 15:40:24 +0100 (CET) Date: Wed, 16 Nov 2022 15:40:24 +0100 From: Peter Zijlstra To: Pengfei Xu Cc: peter.zijlstra@intel.com, linux-kernel@vger.kernel.org, heng.su@intel.com Subject: Re: [Syzkaller & bisect] There is "__perf_event_overflow" WARNING in v6.1-rc5 kernel in guest 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 Wed, Nov 16, 2022 at 11:39:53AM +0800, Pengfei Xu wrote: > Hi Peter and perf expert, > > Greeting! > > Platform: TGL-H > > There is "__perf_event_overflow" WARNING issue in v6.1-rc5 kernel in > guest in double check test. > > Found first bad commit is ca6c21327c6af02b7eec31ce4b9a740a18c6c13f > "perf: Fix missing SIGTRAPs" > > And revert this commit on top of v6.1-rc5, this issue could not be reproduced. > > Guest kconfig, reproduce code from syzkaller, and bisect info are in attached. > > And more detailed info is in link: > https://github.com/xupengfe/syzkaller_logs/tree/main/221114_134736___perf_event_overflow > > If it's helpful and in time, please add the Reported-by tag from me. Does this help? https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=perf/urgent&id=bb88f9695460bec25aa30ba9072595025cf6c8af