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 B1EFEC6FA83 for ; Tue, 27 Sep 2022 18:06:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230131AbiI0SGj (ORCPT ); Tue, 27 Sep 2022 14:06:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38094 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233083AbiI0SGh (ORCPT ); Tue, 27 Sep 2022 14:06:37 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 44C0DD98D6 for ; Tue, 27 Sep 2022 11:06:36 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id E6772B81CF7 for ; Tue, 27 Sep 2022 18:06:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id AC349C433C1 for ; Tue, 27 Sep 2022 18:06:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1664301993; bh=x9z+meJ+MD4gupidK5WHg25/IvGIbquPmCPRv8Wez3Y=; h=From:To:Subject:Date:In-Reply-To:References:From; b=DkMHuYMYi0kHqA1vvcMNEbnY4r4xuxNwHvOU3EI/DXByvJuQoBzrHc0xdG22WBYzE STI44HVyosjPxhivGurSdCl3Enl63MwZgjl3dy3gzBxZYBAqrSlVuYRl9oBd2brcXf CMsLeO4KLiXnwgpFK2yi6wpr0CChvoFGbcj7Xz5PHjxWiAIQaH365v8BUDhHfoZWeM IkfHKIWERYUmw6VRPTkb0WSZHOODq88iStCuQhJUpQ3XW6h4MgcCyG78dG+bt8vAsN ClnjsoKZUE0JsI2kgHk8FgqXjD9CLRwKg7lVQTMaXBx9t2qgUMdMwN//fyDC6HTS8v fsUvRGmF/TVRg== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 95950C433E9; Tue, 27 Sep 2022 18:06:33 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-ext4@vger.kernel.org Subject: [Bug 216529] [fstests generic/048] BUG: Kernel NULL pointer dereference at 0x00000069, filemap_release_folio+0x88/0xb0 Date: Tue, 27 Sep 2022 18:06:33 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo fs_ext4@kernel-bugs.osdl.org X-Bugzilla-Product: File System X-Bugzilla-Component: ext4 X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: tytso@mit.edu X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: fs_ext4@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=3D216529 --- Comment #3 from Theodore Tso (tytso@mit.edu) --- On Tue, Sep 27, 2022 at 12:47:02AM +0000, bugzilla-daemon@kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=3D216529 >=20 > Yes, it's reproducible for me, I just reproduced it again on another ppc6= 4le > (P8) machine [1]. But it's not easy to reproduce by running generic/048 > (maybe > there's a better way to reproduce it). Can you give a rough percentage of how often it reproduces? e.g., does it reproduces 10% of the time? 50% of the time? 2-3 times after 100 tries, so 2-3%? etc. If it reproduces but rarely, it'll be a lot harder to try to bisect. Something perhaps to try is to enable KASAN, since both stack traces seem to involve a null pointer derference while trying to free buffers. Maybe that will give us some hints towards the cause.... Thanks, - Ted --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=