From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E2C7830FA4 for ; Wed, 20 Sep 2023 12:20:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63F8AC433C8; Wed, 20 Sep 2023 12:20:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695212407; bh=d75NEs53D+MrAnB5JU+rQffFL7BUU9/n6Hg+6jPN+Y0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=geFZGm6XTBwtYOmHvoipCEyfK7x1/Gss+ype7CXbFVbkBd63LYDqwYt+XbmB/x+VC BOEIu2OCszEZpoSPc04+L878Mvmxf3IcRA3m6ujakMGlUr7Wj+Va/6Krp0J6+OPjzX QVo5FA/goeeZWNg3M5TDsoUSZeiiQigJbPcZry34= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Qu Wenruo , David Sterba , Sasha Levin Subject: [PATCH 4.19 238/273] btrfs: output extra debug info if we failed to find an inline backref Date: Wed, 20 Sep 2023 13:31:18 +0200 Message-ID: <20230920112853.706283568@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112846.440597133@linuxfoundation.org> References: <20230920112846.440597133@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Qu Wenruo [ Upstream commit 7f72f50547b7af4ddf985b07fc56600a4deba281 ] [BUG] Syzbot reported several warning triggered inside lookup_inline_extent_backref(). [CAUSE] As usual, the reproducer doesn't reliably trigger locally here, but at least we know the WARN_ON() is triggered when an inline backref can not be found, and it can only be triggered when @insert is true. (I.e. inserting a new inline backref, which means the backref should already exist) [ENHANCEMENT] After the WARN_ON(), dump all the parameters and the extent tree leaf to help debug. Link: https://syzkaller.appspot.com/bug?extid=d6f9ff86c1d804ba2bc6 Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/extent-tree.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index d71f800e8bf60..bb05b0a82c8ba 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -1549,6 +1549,11 @@ int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, err = -ENOENT; goto out; } else if (WARN_ON(ret)) { + btrfs_print_leaf(path->nodes[0]); + btrfs_err(fs_info, +"extent item not found for insert, bytenr %llu num_bytes %llu parent %llu root_objectid %llu owner %llu offset %llu", + bytenr, num_bytes, parent, root_objectid, owner, + offset); err = -EIO; goto out; } -- 2.40.1