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[2620:137:e000::1:20]) by mx.google.com with ESMTP id jt5-20020a170906dfc500b00992ae4cf3basi9011654ejc.996.2023.07.26.00.05.51; Wed, 26 Jul 2023 00:06:16 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232192AbjGZG6T (ORCPT + 99 others); Wed, 26 Jul 2023 02:58:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232252AbjGZG5w (ORCPT ); Wed, 26 Jul 2023 02:57:52 -0400 Received: from mail-oa1-f72.google.com (mail-oa1-f72.google.com [209.85.160.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5ECA63A9C for ; Tue, 25 Jul 2023 23:57:25 -0700 (PDT) Received: by mail-oa1-f72.google.com with SMTP id 586e51a60fabf-1b03f7fb970so12389554fac.1 for ; Tue, 25 Jul 2023 23:57:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690354643; x=1690959443; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=z9IC2Px3hsKC6Dxupx1FkylpkrCD57M7Lz4dPPJQv8I=; b=hvmkGs3H8/m4qVAq5kcBRzzelFKJfa9zPGKDcPlR+eJrqc4Zk5qYiDpgMXeeqJHy0j m57CB7UbGYC0S/ikWWAzG4jCugbrTrKnZhs4ob8OHAcTPzUm+AWmLkBrnX1qeu/0ZbLD 33+C37EmoIIKdt1DR75J4dtu7XO0Ya7YXCMzNeVbp9I7A1lNQH4tJGN913JKcdl5dDDM cNjYao2oKRpTLzV4F1UvHgk4LnU2jomXzn0okLWMBpRlFGCWY6JPOoxIMh5N0Xsm16po /JyeJBWGPAFATrWU1rD+oOXLB2W8yR4sBwS6+5xDY+ufhmtNKbMtgGfVJUP1Q2KfYrjt iV/w== X-Gm-Message-State: ABy/qLZGZVZyAksEqJV81Q1FvMJbN/4FzvVvVmigc7T68LPkAb2dfKZ/ vNOwXR0HLSRWE1rRrzsWLzJJSzgBFoDBG/YOZP2w8V48N6fQ MIME-Version: 1.0 X-Received: by 2002:a05:6870:c7a8:b0:1ba:e872:7a2e with SMTP id dy40-20020a056870c7a800b001bae8727a2emr2252504oab.11.1690354643035; Tue, 25 Jul 2023 23:57:23 -0700 (PDT) Date: Tue, 25 Jul 2023 23:57:22 -0700 In-Reply-To: <000000000000607ff905ffc8e477@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000aeb7f06015e5cbd@google.com> Subject: Re: [syzbot] [mm?] WARNING: suspicious RCU usage in mas_walk (2) From: syzbot To: akpm@linux-foundation.org, liam.howlett@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has bisected this issue to: commit a52f58b34afe095ebc5823684eb264404dad6f7b Author: Matthew Wilcox (Oracle) Date: Mon Jul 24 18:54:10 2023 +0000 mm: handle faults that merely update the accessed bit under the VMA lock bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1783585ea80000 start commit: [unknown] git tree: linux-next final oops: https://syzkaller.appspot.com/x/report.txt?x=1443585ea80000 console output: https://syzkaller.appspot.com/x/log.txt?x=1043585ea80000 kernel config: https://syzkaller.appspot.com/x/.config?x=f481ab36ce878b84 dashboard link: https://syzkaller.appspot.com/bug?extid=8645fe63c4d22c8d27b8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1697cec9a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1566986ea80000 Reported-by: syzbot+8645fe63c4d22c8d27b8@syzkaller.appspotmail.com Fixes: a52f58b34afe ("mm: handle faults that merely update the accessed bit under the VMA lock") For information about bisection process see: https://goo.gl/tpsmEJ#bisection