netdev - Re: [PATCH] SUNRPC: Fix iter_iov

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Date:   Mon, 29 Oct 2018 18:02:30 +0000
From:   Trond Myklebust <trondmy@...merspace.com>
To:     "viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>,
        "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
        "julien.thierry@....com" <julien.thierry@....com>
CC:     "bfields@...ldses.org" <bfields@...ldses.org>,
        "anna.schumaker@...app.com" <anna.schumaker@...app.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jlayton@...nel.org" <jlayton@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] SUNRPC: Fix iter_iov_*vec warnings

Cc: Al, since this wants to go through his pull request (the RPC code
has already been merged).

On Mon, 2018-10-29 at 17:55 +0000, Julien Thierry wrote:
> While booting linux-next on Juno with rootfs over NFS, the following
> warning is spammed on kernel log:
> 
> [   16.988190] WARNING: CPU: 1 PID: 680 at lib/iov_iter.c:1082
> iov_iter_kvec+0x20/0x40
> [   16.995776] Modules linked in:
> [   16.998801] CPU: 1 PID: 680 Comm: kworker/u13:0 Not tainted
> 4.19.0-next-20181029 #2238
> [   17.006640] Hardware name: ARM Juno development board (r0) (DT)
> [   17.012505] Workqueue: xprtiod xs_stream_data_receive_workfn
> [   17.018108] pstate: 00000005 (nzcv daif -PAN -UAO)
> [   17.022851] pc : iov_iter_kvec+0x20/0x40
> [   17.026733] lr : xs_stream_data_receive+0x194/0x378
> [   17.031559] sp : ffff00000b033ce0
> [   17.034836] x29: ffff00000b033ce0 x28: 0000000000000000
> [   17.040095] x27: ffff8009760b9870 x26: ffff00000917e1c8
> [   17.045352] x25: 0000000000000000 x24: ffff800976a91598
> [   17.050610] x23: ffff000009169000 x22: ffff8009775f0000
> [   17.055867] x21: 000000000000000c x20: ffff800976a91578
> [   17.061124] x19: ffff800976a91000 x18: 0000000000000000
> [   17.066381] x17: 0000000000000000 x16: 0000000000000000
> [   17.071639] x15: 0000000000000400 x14: 0000000000000400
> [   17.076896] x13: 0000000000000400 x12: 0000000000002f28
> [   17.082153] x11: 0000000000000000 x10: 0000000000000960
> [   17.087410] x9 : ffff00000b033d50 x8 : fefefefefefefeff
> [   17.092667] x7 : ffff80097ff9d380 x6 : 0000000000000000
> [   17.097924] x5 : 00646f6974727078 x4 : 000000000000000c
> [   17.103181] x3 : 0000000000000001 x2 : ffff00000b033d30
> [   17.108438] x1 : 0000000000000002 x0 : ffff00000b033d50
> [   17.113695] Call trace:
> [   17.116115]  iov_iter_kvec+0x20/0x40
> [   17.119652]  xs_stream_data_receive_workfn+0x10/0x18
> [   17.124568]  process_one_work+0x1c8/0x318
> [   17.128535]  worker_thread+0x48/0x428
> [   17.132158]  kthread+0xf8/0x128
> [   17.135266]  ret_from_fork+0x10/0x18
> [   17.138801] ---[ end trace 65cbcd2ddaeef59e ]---
> 
> This is likely a clash between the recent addition of vector
> iterators to
> SUNRPC and the recent
> commit aa563d7bca6e882ec2bdae24603c8f016401a144 ("iov_iter: Separate
> type from direction and use accessor functions") which slightly
> changes
> the usage of those iterators by splitting type and direction.
> 
> Fix this by not including type in the direction of the operation.
> 
> Fixes: 277e4ab7d530bf287e02b65cfcd3ea8f489784f6 ("SUNRPC: Simplify
> TCP
> receive code by switching to using iterators")
> 
> Signed-off-by: Julien Thierry <julien.thierry@....com>
> Cc: Trond Myklebust <trond.myklebust@...merspace.com>
> Cc: Anna Schumaker <anna.schumaker@...app.com>
> Cc: "J. Bruce Fields" <bfields@...ldses.org>
> Cc: Jeff Layton <jlayton@...nel.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: netdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  net/sunrpc/xprtsock.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
> index 1b51e04..ae77c71 100644
> --- a/net/sunrpc/xprtsock.c
> +++ b/net/sunrpc/xprtsock.c
> @@ -361,7 +361,7 @@ static void xs_free_peer_addresses(struct
> rpc_xprt *xprt)
>  xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
>  		struct kvec *kvec, size_t count, size_t seek)
>  {
> -	iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, kvec, 1,
> count);
> +	iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
>  	return xs_sock_recvmsg(sock, msg, flags, seek);
>  }
>  
> @@ -370,7 +370,7 @@ static void xs_free_peer_addresses(struct
> rpc_xprt *xprt)
>  		struct bio_vec *bvec, unsigned long nr, size_t count,
>  		size_t seek)
>  {
> -	iov_iter_bvec(&msg->msg_iter, READ | ITER_BVEC, bvec, nr,
> count);
> +	iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
>  	return xs_sock_recvmsg(sock, msg, flags, seek);
>  }
>  
-- 
Trond Myklebust
CTO, Hammerspace Inc
4300 El Camino Real, Suite 105
Los Altos, CA 94022
www.hammer.space