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 2CD103C464 for ; Fri, 19 Jan 2024 11:03:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705662210; cv=none; b=btR7B2S0RZWryHzUsiuifxsJpsX3ljQ/R3vrlryOp+xLOAySOgj8Cm+ZvWys/IRg7qj8nf9/daRVE6ERViKft/epGjP4B7a5L57Kk1QULtB7aAYOb4XLuIslW5FVE7AO5k/mumJFeXTpwUtt/ImBNnPFZzsttjhqVv5CL4zSIEI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705662210; c=relaxed/simple; bh=90L0TyGCRa/p8YzdnnC8AwWqJVVgZhNTJSSFq0KBZJ0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=DrqjRHUowHVBsCIuTaF4tgg3vg9+b/ibZOnxjppzDyJKlKHv2VYT5RvNCOAMoC/Efk26yGmmXiEBNVgPIKx2bexo37lFPzl5RAH6pNZ6/Z4iah3afpEJFdJv5FHRFwCI+C50zF+wC5+TLbC0y0aCKUiadg0pyJaH2EhhukyBiOo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JkLISUST; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JkLISUST" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17B7DC433F1; Fri, 19 Jan 2024 11:03:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705662209; bh=90L0TyGCRa/p8YzdnnC8AwWqJVVgZhNTJSSFq0KBZJ0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=JkLISUSTwhFFTvdoO2gCWG6TQ+aLJb9zJCBUntk9xTDCN/PPjHauKPjqLlEzMaCC2 Sk2sgZTjwrA4wVn3zn1SOYb0kpGD036Ev2eXLmUR9xt7nKMGOtM3133WcZ7hmK6oTa 8N1lSCoBTqr+eR9fMmYjPUahYtYHU6H/NZHDcTOZHjkkHrtB5cE4j8VtUTXiWOdDCu vd6uW5GJ+oN8BIL3EltDvGji0zN2Qvl3ILEaJ2SnKxLHOaEi8vnrSDmJh8BioWWhaD Xbcbq9X+jMGxKwKc+BuRRkL99Iv83gsSysX2SK8sJPkj4c5UI3IjCQCjoJOLIsrYO4 ucROis58rcrFg== Message-ID: <6f1e6ba6f0f5ca1b613aa0372c109289193170ee.camel@kernel.org> Subject: Re: [PATCH v4 1/3] libceph: fail the sparse-read if there still has data in socket From: Jeff Layton To: Xiubo Li , ceph-devel@vger.kernel.org Cc: idryomov@gmail.com, vshankar@redhat.com, mchangir@redhat.com Date: Fri, 19 Jan 2024 06:03:27 -0500 In-Reply-To: References: <20240118105047.792879-1-xiubli@redhat.com> <20240118105047.792879-2-xiubli@redhat.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) Precedence: bulk X-Mailing-List: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2024-01-19 at 12:07 +0800, Xiubo Li wrote: > On 1/18/24 22:03, Jeff Layton wrote: > > On Thu, 2024-01-18 at 18:50 +0800, xiubli@redhat.com wrote: > > > From: Xiubo Li > > >=20 > > > Once this happens that means there have bugs. > > >=20 > > > URL: https://tracker.ceph.com/issues/63586 > > > Signed-off-by: Xiubo Li > > > --- > > > net/ceph/osd_client.c | 9 +++++++++ > > > 1 file changed, 9 insertions(+) > > >=20 > > > diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c > > > index 9be80d01c1dc..f8029b30a3fb 100644 > > > --- a/net/ceph/osd_client.c > > > +++ b/net/ceph/osd_client.c > > > @@ -5912,6 +5912,13 @@ static int osd_sparse_read(struct ceph_connect= ion *con, > > > fallthrough; > > > case CEPH_SPARSE_READ_DATA: > > > if (sr->sr_index >=3D count) { > > > + if (sr->sr_datalen) { > > > + pr_warn_ratelimited("sr_datalen %u sr_index %d count %u\n", > > > + sr->sr_datalen, sr->sr_index, > > > + count); > > > + return -EREMOTEIO; > > > + } > > > + > > Ok, so the server has (presumably) sent us a longer value for the > > sr_datalen than was in the extent map? > >=20 > > Why should the sparse read engine care about that? It was (presumably) > > able to do its job of handling the read. Why not just advance past the > > extra junk and try to do another sparse read? Do we really need to fail > > the op for this? >=20 > Hi Jeff, >=20 > I saw the problem just when I first debugging the sparse-read bug, and= =20 > the length will be very large, more detail and the logs please see the= =20 > tracker https://tracker.ceph.com/issues/63586: >=20 > =A0=A0=A0=A0 11741055 <4>[180940.606488] libceph: sr_datalen 251723776 s= r_index=20 > 0 count 0 >=20 > In this case the request could cause the same request being retrying=20 > infinitely. While just in other case the when the ceph send a incorrect= =20 > data length, how should we do ? Should we retry it ? How could we skip= =20 > it if the length is so large ? >=20 >=20 If the sparse_read datalen is so long that it goes beyond the length of the entire frame, then it's clearly malformed and we have to reject it. I do wonder though whether this is the right place to do that. It seems like the client ought to do that sort of vetting of lengths before it starts dealing with the read data. IOW, maybe there should be a simple check in the CEPH_SPARSE_READ_DATA_LEN case that validates that the sr_datalen fits inside the "data_len" of the entire frame? >=20 >=20 > >=20 > > > sr->sr_state =3D CEPH_SPARSE_READ_HDR; > > > goto next_op; > > > } > > > @@ -5919,6 +5926,8 @@ static int osd_sparse_read(struct ceph_connecti= on *con, > > > eoff =3D sr->sr_extent[sr->sr_index].off; > > > elen =3D sr->sr_extent[sr->sr_index].len; > > > =20 > > > + sr->sr_datalen -=3D elen; > > > + > > > dout("[%d] ext %d off 0x%llx len 0x%llx\n", > > > o->o_osd, sr->sr_index, eoff, elen); > > > =20 >=20 --=20 Jeff Layton