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=-13.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 92CC3C4320A for ; Tue, 24 Aug 2021 11:41:03 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 167576124B for ; Tue, 24 Aug 2021 11:41:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 167576124B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 6F69A6B006C; Tue, 24 Aug 2021 07:41:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6A6AE6B0071; Tue, 24 Aug 2021 07:41:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 56DE96B0072; Tue, 24 Aug 2021 07:41:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0046.hostedemail.com [216.40.44.46]) by kanga.kvack.org (Postfix) with ESMTP id 3B4806B006C for ; Tue, 24 Aug 2021 07:41:02 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id CB3098249980 for ; Tue, 24 Aug 2021 11:41:01 +0000 (UTC) X-FDA: 78509782722.13.EB87CEB Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by imf04.hostedemail.com (Postfix) with ESMTP id 5637350000AD for ; Tue, 24 Aug 2021 11:41:01 +0000 (UTC) Received: from imap1.suse-dmz.suse.de (imap1.suse-dmz.suse.de [192.168.254.73]) (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-out1.suse.de (Postfix) with ESMTPS id 2CA17220C8; Tue, 24 Aug 2021 11:41:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1629805260; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JmfCeTkNM8LU2XTfhyJxD2iUHsTJNZpwiLjx5URyJpM=; b=WTA0ExprQw93kmIO86i4v5hTufBuXrz/twK1x/aNzxibhAoV1+A9tzXo0CidDPSG42eKpS y2095eh1Xc9SzEj2ahyZ5eojNgysKuXcrmMtpgPZcHolmZ/Vkn6MWr42fOZmqE6sse79Ax WGdWUquGxboTTMgCkVNyu83SzwUSAPk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1629805260; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JmfCeTkNM8LU2XTfhyJxD2iUHsTJNZpwiLjx5URyJpM=; b=K46j01ryrauJRZmZK2dze4wTCWqbieTmQyOQm7jz4ScR6mm3dJ3Dq1RuEi/DokH6qgElYk XIgLhodAYLrFBHCw== Received: from imap1.suse-dmz.suse.de (imap1.suse-dmz.suse.de [192.168.254.73]) (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 imap1.suse-dmz.suse.de (Postfix) with ESMTPS id 007E513A50; Tue, 24 Aug 2021 11:40:59 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap1.suse-dmz.suse.de with ESMTPSA id erF5OsvaJGEmHgAAGKfGzw (envelope-from ); Tue, 24 Aug 2021 11:40:59 +0000 Message-ID: <03606e7d-dc38-a439-cd39-3f62b5739db0@suse.cz> Date: Tue, 24 Aug 2021 13:40:59 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.0.1 Subject: Re: [syzbot] WARNING in split_huge_page_to_list Content-Language: en-US To: syzbot , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com References: <00000000000030563005ca006ffd@google.com> Cc: yang Shi , "Kirill A. Shutemov" , Hugh Dickins From: Vlastimil Babka In-Reply-To: <00000000000030563005ca006ffd@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=WTA0Expr; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=K46j01ry; dmarc=none; spf=pass (imf04.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 5637350000AD X-Stat-Signature: cfhrdnppe4s8reixcmkyseheajz3n1c3 X-HE-Tag: 1629805261-43542 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: That's VM_WARN_ON_ONCE_PAGE(page_mapped(page), page); CC folks involved in 504e070dc08f ("mm: thp: replace DEBUG_VM BUG with VM_WARN when unmap fails for split") On 8/20/21 18:48, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: f87d64319e6f Merge tag 'net-5.14-rc7' of git://git.kernel... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1205bd55300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3205625db2f96ac9 > dashboard link: https://syzkaller.appspot.com/bug?extid=0c65e03871b364e714a3 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+0c65e03871b364e714a3@syzkaller.appspotmail.com > > __do_munmap+0x627/0x11c0 mm/mmap.c:2911 > do_munmap mm/mmap.c:2922 [inline] > munmap_vma_range mm/mmap.c:604 [inline] > mmap_region+0x85a/0x1760 mm/mmap.c:1753 > do_mmap+0x86e/0x1180 mm/mmap.c:1584 > vm_mmap_pgoff+0x1b7/0x290 mm/util.c:519 > ksys_mmap_pgoff+0x4a8/0x620 mm/mmap.c:1635 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 2144 at mm/huge_memory.c:2327 unmap_page mm/huge_memory.c:2327 [inline] > WARNING: CPU: 0 PID: 2144 at mm/huge_memory.c:2327 split_huge_page_to_list+0x25eb/0x3e60 mm/huge_memory.c:2700 > Modules linked in: > CPU: 0 PID: 2144 Comm: kswapd1 Not tainted 5.14.0-rc6-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:unmap_page mm/huge_memory.c:2327 [inline] > RIP: 0010:split_huge_page_to_list+0x25eb/0x3e60 mm/huge_memory.c:2700 > Code: 89 de e8 28 e1 b6 ff 84 db 0f 85 54 e0 ff ff e8 6b d9 b6 ff 48 c7 c6 e0 d8 97 89 48 89 ef e8 9c 72 e9 ff c6 05 05 dd 99 0b 01 <0f> 0b e9 32 e0 ff ff bb 02 00 00 00 e9 64 ef ff ff e8 3f d9 b6 ff > RSP: 0018:ffffc900084f76d8 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: ffff88801c44c000 RSI: ffffffff81be0514 RDI: 0000000000000003 > RBP: ffffea00021c0000 R08: 0000000000000029 R09: 00000000ffffffff > R10: ffffffff88ea7679 R11: 00000000ffffffff R12: ffff88814018d2d8 > R13: ffffea00021c0008 R14: ffffea00021c0000 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f14895d5000 CR3: 0000000017350000 CR4: 00000000001506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > split_huge_page include/linux/huge_mm.h:192 [inline] > deferred_split_scan+0x5fa/0xbd0 mm/huge_memory.c:2860 > do_shrink_slab+0x42d/0xbd0 mm/vmscan.c:709 > shrink_slab+0x17c/0x6e0 mm/vmscan.c:869 > shrink_node_memcgs mm/vmscan.c:2868 [inline] > shrink_node+0x8d1/0x1df0 mm/vmscan.c:2983 > kswapd_shrink_node mm/vmscan.c:3726 [inline] > balance_pgdat+0x7ce/0x13b0 mm/vmscan.c:3917 > kswapd+0x5b6/0xdb0 mm/vmscan.c:4176 > kthread+0x3e5/0x4d0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >