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 32760C38A02 for ; Mon, 31 Oct 2022 07:11:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229566AbiJaHLd (ORCPT ); Mon, 31 Oct 2022 03:11:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39816 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229441AbiJaHLb (ORCPT ); Mon, 31 Oct 2022 03:11:31 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CAD5BB857 for ; Mon, 31 Oct 2022 00:11:30 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 864B11F45B; Mon, 31 Oct 2022 07:11:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1667200289; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type; bh=OJN0AIw8urlAT1fZfW3NdZEOZNsYyNMubtI/+K66Zxg=; b=CwmZSX+rU4bLUcR94rOG7gcXkxM5hBYu3BacTiLEwoSoIPW6uQgfOFJ6iCqrfpyXUcn9wc moVQIKouGbkWX6LegqtrlacrBGOG11H5HnXAWWeUjMgDcTHHa3eEIJEMUNCJB8DFUCwjH2 jKpcWedSETfGOwwzftVvAiI4wRLC4bs= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1667200289; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type; bh=OJN0AIw8urlAT1fZfW3NdZEOZNsYyNMubtI/+K66Zxg=; b=BAx+LlOYgNlVGu1/uU9Wg1Gj0dtF6t6irfmNZ2Th/8VSPvnvyd4lpPuZoG+LWM5ga2+5cz UhH+LO+OHN/FfaDw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 690BB13451; Mon, 31 Oct 2022 07:11:29 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id QubrGCF1X2P8GAAAMHmgww (envelope-from ); Mon, 31 Oct 2022 07:11:29 +0000 Date: Mon, 31 Oct 2022 08:11:28 +0100 Message-ID: <87h6zklb6n.wl-tiwai@suse.de> From: Takashi Iwai To: Steven Rostedt Cc: regressions@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [REGRESSION 6.0.x / 6.1.x] NULL dereferencing at tracing User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.2 Mule/6.0 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Steven, we've got a bug report indicating the NULL dereference at the recent tracing changes, showing at the start of KDE. The details including the dmesg are found at: https://bugzilla.opensuse.org/show_bug.cgi?id=1204705 It was reported at first for 6.0.3, and confirmed that the problem persists with 6.1-rc, too. The culprit seems to be the commit f3ddb74ad0790030c9592229fb14d8c451f4e9a8 tracing: Wake up ring buffer waiters on closing of the file and reverting it seems fixing the problem. Could you take a look? thanks, Takashi