From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail78-36.sinamail.sina.com.cn (mail78-36.sinamail.sina.com.cn [219.142.78.36]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EFD2B139D19 for ; Mon, 30 Dec 2024 10:41:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=219.142.78.36 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735555301; cv=none; b=Dyu5IcTO1ZYhU4hUgfLC+ObdzHkn8swqdam4aVvjxC9ROIij8KgWFt1ELnmTV79+i6Y6aRkyOEQ8R7HtR52E2RlIJx6ZA8Vp8qK6UOiMVoL0RQobZhFwfa58p95iWa4M/XrRITWNVK38NIFu/ndHgTczmTNLgbXTcLVRziSQL0E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735555301; c=relaxed/simple; bh=Dv6jb8/AAMkfi5UdaIvB5VYjXp913Om7dnLYkz/6BnQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tCWUGY9gZLh1V9FU3CHdgGvkQtvn1IvOM0yqz/1DUTNq1H+Vqk0NOgvRX9FBwiogPUUGLhGV+FLnuDbVEM6vWAZP6bWZoH5vKzirt7M7QM62a3886Wy3dDy9f40e1VJ15QkEixY4l6jQeYdDhzdyZKlXem0Peoyte66QANdqyfM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; arc=none smtp.client-ip=219.142.78.36 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([116.24.11.162]) by sina.com (10.185.250.24) with ESMTP id 677278B000006912; Mon, 30 Dec 2024 18:40:50 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 73915810748399 X-SMAIL-UIID: 7AE30203107648D7B7F48968610EBC99-20241230-184050-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [mm?] WARNING in __folio_rmap_sanity_checks (2) Date: Mon, 30 Dec 2024 18:40:51 +0800 Message-ID: <20241230104052.671-1-hdanton@sina.com> In-Reply-To: <676f84f5.050a0220.2f3838.0493.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Fri, 27 Dec 2024 20:56:21 -0800 > syzbot has found a reproducer for the following issue on: > > HEAD commit: 8155b4ef3466 Add linux-next specific files for 20241220 > git tree: linux-next > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1652fadf980000 #syz test --- x/mm/filemap.c +++ y/mm/filemap.c @@ -3636,6 +3636,10 @@ static vm_fault_t filemap_map_folio_rang continue; skip: if (count) { + for (unsigned int i = 0; i < count; i++) { + if (page_folio(page + i) != folio) + goto out; + } set_pte_range(vmf, folio, page, count, addr); *rss += count; folio_ref_add(folio, count); @@ -3658,6 +3662,7 @@ skip: ret = VM_FAULT_NOPAGE; } +out: vmf->pte = old_ptep; return ret; --