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=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 6A870C282DD for ; Tue, 23 Apr 2019 17:53:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 33DAE214AE for ; Tue, 23 Apr 2019 17:53:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="V+AOhodA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728752AbfDWRxe (ORCPT ); Tue, 23 Apr 2019 13:53:34 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:34374 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726655AbfDWRxd (ORCPT ); Tue, 23 Apr 2019 13:53:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Hu2+IHvU0rbjKTuDhKIV7ajzUzxsMVFATjP9eUoiQdA=; b=V+AOhodAI+KAMRnXGD2WAOGJQ xPQ5d4bCeODBL2OqoCj8evwLcikkJhxk2qk5dh2E9kn+CSgyJqTsvvCYZuxJN219WNLsMnIdgCQaT Ly79tNmWBMwlhG/27ffMqzsvCfZfASKYN20e9Xz3d7iJ+NnXgIXBn1kHe2YN8jGrUSp1zwKQx54Nz Z01b+yw3jDza/c4oO9DOUwFLRUVtnwKSZtXnK6H/urYIjYe7sMGC31dg0UvgwmZbnOjI3exfVz7yS vYqqufXzb4cR/PfHUEpOSMEF8OBUWV30jwMwH3U99FNG0Ub6dRVQbaMAv5593KRL76F9wBL7C5SlE Mc/SjbtAg==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hIzbi-0001CA-UI; Tue, 23 Apr 2019 17:53:26 +0000 Date: Tue, 23 Apr 2019 10:53:26 -0700 From: Matthew Wilcox To: syzbot Cc: akpm@linux-foundation.org, aneesh.kumar@linux.ibm.com, dave.jiang@intel.com, hughd@google.com, jglisse@redhat.com, jrdr.linux@gmail.com, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.com, rientjes@google.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Subject: Re: WARNING: locking bug in split_huge_page_to_list Message-ID: <20190423175326.GC19031@bombadil.infradead.org> References: <0000000000003c9bea058734dc28@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000003c9bea058734dc28@google.com> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 23, 2019 at 09:13:06AM -0700, syzbot wrote: > DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS) > WARNING: CPU: 0 PID: 1553 at kernel/locking/lockdep.c:3673 > __lock_acquire+0x1887/0x3fb0 kernel/locking/lockdep.c:3673 > down_write+0x38/0x90 kernel/locking/rwsem.c:70 > anon_vma_lock_write include/linux/rmap.h:120 [inline] All anon_vmas share the same lockdep map, so I think this is just a victim of someone else who's taken all the lockdep classes.