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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27B77C433FE for ; Wed, 16 Nov 2022 20:12:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4641D6B0071; Wed, 16 Nov 2022 15:12:36 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 414346B0073; Wed, 16 Nov 2022 15:12:36 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 304136B0074; Wed, 16 Nov 2022 15:12:36 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 1F55C6B0071 for ; Wed, 16 Nov 2022 15:12:36 -0500 (EST) Received: from smtpin26.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id B45F3C01F3 for ; Wed, 16 Nov 2022 20:12:35 +0000 (UTC) X-FDA: 80140403070.26.32822C8 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf24.hostedemail.com (Postfix) with ESMTP id 4BB91180016 for ; Wed, 16 Nov 2022 20:12:34 +0000 (UTC) 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 dfw.source.kernel.org (Postfix) with ESMTPS id 141E661F7E; Wed, 16 Nov 2022 20:12:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46950C433D6; Wed, 16 Nov 2022 20:12:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668629553; bh=nKmdqQ14QC5fdMxLgY/zru8azigJGTo+MgnD5VdFrA4=; h=Date:From:To:Cc:Subject:From; b=ZmqoITTL1pnLuDiQpbHotHXGxfuEMl/2nicwHx+AXXL91qYLDcyA4XIw72Y9I8qBg SkpESnDQZuXWZ+HemlXojK/cYWpX5zAWtFlGt1axYbcSdUOtxbRYeK2LMQmaQ96KoG EEzgQII8e0FqtRWZGlPrbSbkc1gwFe4p5aY2jE0t4E0gRlIN2dPI30rSpkgAVAsT56 ykAZ+Vbe9ercgg8tAYQ4NpXiljxwUkudij3IkuSk9hUYziHa9/NEVi0CmumiiQ7i2g JHF9DA0LS3rvjItCKjkOaOzLAfZBG+v/P8TFzfgKSuRWk9Uwt4tPvBoAYcRsxuVR6g rbvf6wlBq9/IQ== Date: Wed, 16 Nov 2022 12:12:31 -0800 From: Eric Biggers To: Alexander Potapenko , Marco Elver , Dmitry Vyukov Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: KMSAN broken with lockdep again? Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1668629555; a=rsa-sha256; cv=none; b=AQK/uLQyDKeijV4KYaJ4RpBOakd8Gmqwc2tHPSq0QA2KZAZIIf6OZdP09m+cFRskyvNOUb QrzDeqEueqir9Vvgih1Z4Yn/EGlundvEojy7GFITIuSWfqTW9/wAn4NoRecvoAXdyEoq0h hFoNhoL5RuHvemUaVLophsatI8udpis= ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=ZmqoITTL; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf24.hostedemail.com: domain of ebiggers@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=ebiggers@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1668629555; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding:in-reply-to: references:dkim-signature; bh=bEeJvOi1zvY1PJEhN3tJFTtRXV9zitnChh9ZoFPUJUI=; b=3qx+9ZA2WvUS+HClv25J7jnn+nY/NKXPUhx/hXXpte+yIsLeqnUTlcuOKmmMxLjDbUhex4 RiF1sgw6/DTGk1x1auoWyPv7aOTE7qgnqi6qOMFIWBbtv9d73DrdBikENCbp752apAQ7A0 lYnXQOk8v8KTZlHzgMe9p4v3V1vn5go= X-Rspam-User: Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=ZmqoITTL; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf24.hostedemail.com: domain of ebiggers@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=ebiggers@kernel.org X-Rspamd-Server: rspam02 X-Stat-Signature: ziah47q9krydfnny8yibia6qu9qucmkw X-Rspamd-Queue-Id: 4BB91180016 X-HE-Tag: 1668629554-476201 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi, I'm trying v6.1-rc5 with CONFIG_KMSAN, but the kernel continuously spams "BUG: KMSAN: uninit-value in __init_waitqueue_head". I tracked it down to lockdep (CONFIG_PROVE_LOCKING=y). The problem goes away if I disable that. I don't see any obvious use of uninitialized memory in __init_waitqueue_head(). The compiler I'm using is tip-of-tree clang (LLVM commit 4155be339ba80fef). Is this a known issue? - Eric