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Tue, 17 Sep 2024 21:04:03 -0700 (PDT) Received: from kernelexploit-virtual-machine.localdomain ([121.185.186.233]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20794603792sm57160435ad.106.2024.09.17.21.04.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Sep 2024 21:04:02 -0700 (PDT) From: Jeongjun Park To: syzbot+702361cf7e3d95758761@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [mm?] KCSAN: data-race in generic_fillattr / shmem_mknod (2) Date: Wed, 18 Sep 2024 13:03:59 +0900 Message-Id: <20240918040359.189212-1-aha310510@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <0000000000007337c705fa1060e2@google.com> References: <0000000000007337c705fa1060e2@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master --- fs/ext4/super.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index e72145c4ae5a..466aece8518f 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -338,7 +338,7 @@ ext4_fsblk_t ext4_inode_table(struct super_block *sb, __u32 ext4_free_group_clusters(struct super_block *sb, struct ext4_group_desc *bg) { - return le16_to_cpu(bg->bg_free_blocks_count_lo) | + return le16_to_cpu(READ_ONCE(bg->bg_free_blocks_count_lo)) | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); } @@ -394,7 +394,7 @@ void ext4_inode_table_set(struct super_block *sb, void ext4_free_group_clusters_set(struct super_block *sb, struct ext4_group_desc *bg, __u32 count) { - bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); + WRITE_ONCE(bg->bg_free_blocks_count_lo, cpu_to_le16((__u16)count)); if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); } --