From nobody Thu Sep 18 20:20:40 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70794C4321E for ; Sat, 3 Dec 2022 02:38:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235240AbiLCCiv (ORCPT ); Fri, 2 Dec 2022 21:38:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56780 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235190AbiLCCip (ORCPT ); Fri, 2 Dec 2022 21:38:45 -0500 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 374CDEC096; Fri, 2 Dec 2022 18:38:44 -0800 (PST) Received: from mail02.huawei.com (unknown [172.30.67.153]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4NPDWy3QBcz4f3p15; Sat, 3 Dec 2022 10:38:38 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.127.227]) by APP4 (Coremail) with SMTP id gCh0CgDXSNavtopjXug+Bg--.58501S5; Sat, 03 Dec 2022 10:38:41 +0800 (CST) From: Ye Bin To: tytso@mit.edu, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org Cc: linux-kernel@vger.kernel.org, jack@suse.cz, Ye Bin , syzbot+05a0f0ccab4a25626e38@syzkaller.appspotmail.com Subject: [PATCH v3 1/3] ext4: fix incorrect calculate 'reserved' in '__es_remove_extent' when enable bigalloc feature Date: Sat, 3 Dec 2022 10:59:39 +0800 Message-Id: <20221203025941.2661302-2-yebin@huaweicloud.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221203025941.2661302-1-yebin@huaweicloud.com> References: <20221203025941.2661302-1-yebin@huaweicloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgDXSNavtopjXug+Bg--.58501S5 X-Coremail-Antispam: 1UD129KBjvJXoWxJF1UXr1rXF4UJF45CryrCrg_yoW5Jr45p3 y8Ar4UWryfuw1UW3yftw1j9rn29a4UCr47WFs3t343uFy5A3sagr10kFs0vFWYqrWIgw4D XFWrtw12q3WUGaDanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvGb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUGw A2048vs2IY020Ec7CjxVAFwI0_JFI_Gr1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMc Ij6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_ Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr 0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY 17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcV C0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY 6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa 73UjIFyTuYvjxUzl1vUUUUU X-CM-SenderInfo: p1hex046kxt4xhlfz01xgou0bp/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Ye Bin Syzbot report issue as follows: EXT4-fs error (device loop0): ext4_validate_block_bitmap:398: comm rep: bg = 0: block 5: invalid block bitmap EXT4-fs (loop0): Delayed block allocation failed for inode 18 at logical of= fset 0 with max blocks 32 with error 28 EXT4-fs (loop0): This should not happen!! Data will be lost EXT4-fs (loop0): Total free blocks count 0 EXT4-fs (loop0): Free/Dirty block details EXT4-fs (loop0): free_blocks=3D0 EXT4-fs (loop0): dirty_blocks=3D32 EXT4-fs (loop0): Block reservation details EXT4-fs (loop0): i_reserved_data_blocks=3D2 EXT4-fs (loop0): Inode 18 (00000000845cd634): i_reserved_data_blocks (1) no= t cleared! Above issue happens as follows: Assume: sbi->s_cluster_ratio =3D 16 Step1: Insert delay block [0, 31] -> ei->i_reserved_data_blocks=3D2 Step2: ext4_writepages mpage_map_and_submit_extent -> return failed mpage_release_unused_pages -> to release [0, 30] ext4_es_remove_extent -> remove lblk=3D0 end=3D30 __es_remove_extent -> len1=3D0 len2=3D31-30=3D1 __es_remove_extent: ... if (len2 > 0) { ... if (len1 > 0) { ... } else { es->es_lblk =3D end + 1; es->es_len =3D len2; ... } if (count_reserved) count_rsvd(inode, lblk, orig_es.es_len - len1 - len2, &orig_es, &rc); goto out; -> will return but didn't calculate 'reserved' ... Step3: ext4_destroy_inode -> trigger "i_reserved_data_blocks (1) not cleare= d!" To solve above issue if 'len2>0' call 'get_rsvd()' before goto out. Reported-by: syzbot+05a0f0ccab4a25626e38@syzkaller.appspotmail.com Fixes: 8fcc3a580651 ("ext4: rework reserved cluster accounting when invalid= ating pages") Signed-off-by: Ye Bin Reviewed-by: Eric Whitney --- fs/ext4/extents_status.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c index cd0a861853e3..7ada374ff27d 100644 --- a/fs/ext4/extents_status.c +++ b/fs/ext4/extents_status.c @@ -1371,7 +1371,7 @@ static int __es_remove_extent(struct inode *inode, ex= t4_lblk_t lblk, if (count_reserved) count_rsvd(inode, lblk, orig_es.es_len - len1 - len2, &orig_es, &rc); - goto out; + goto out_get_reserved; } =20 if (len1 > 0) { @@ -1413,6 +1413,7 @@ static int __es_remove_extent(struct inode *inode, ex= t4_lblk_t lblk, } } =20 +out_get_reserved: if (count_reserved) *reserved =3D get_rsvd(inode, end, es, &rc); out: --=20 2.31.1