netdev - Re: INFO: rcu detected stall in vprintk

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Message-ID: <20180402020413.GD3795@jagdpanzerIV>
Date:   Mon, 2 Apr 2018 11:04:13 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+3f28bd18291266ec826b@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        syzkaller-bugs@...glegroups.com,
        Samuel Ortiz <sameo@...ux.intel.com>,
        David Miller <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: INFO: rcu detected stall in vprintk_func

On (04/02/18 10:54), Sergey Senozhatsky wrote:
> > > If you forward the report, please keep this part and the footer.
> > >
> > > llcp: nfc_llcp_send_ui_frame: Could not allocate PDU
> > > llcp: nfc_llcp_send_ui_frame: Could not allocate PDU
> > > llcp: nfc_llcp_send_ui_frame: Could not allocate PDU
> > > llcp: nfc_llcp_send_ui_frame: Could not allocate PDU

[..]

> diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c
> index ef4026a23e80..a309a27581da 100644
> --- a/net/nfc/llcp_core.c
> +++ b/net/nfc/llcp_core.c
> @@ -1386,7 +1386,7 @@ static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
>  
>  		new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
>  		if (new_skb == NULL) {
> -			pr_err("Could not allocate PDU\n");
> +			pr_err_ratelimited("Could not allocate PDU\n");
>  			return;
>  		}

And of course I ended up patching the wrong function...
What I actually meant was:

---

diff --git a/net/nfc/llcp_commands.c b/net/nfc/llcp_commands.c
index 2ceefa183cee..2f3becb709b8 100644
--- a/net/nfc/llcp_commands.c
+++ b/net/nfc/llcp_commands.c
@@ -755,7 +755,7 @@ int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
 		pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
 					 frag_len + LLCP_HEADER_SIZE, &err);
 		if (pdu == NULL) {
-			pr_err("Could not allocate PDU\n");
+			pr_err_ratelimited("Could not allocate PDU\n");
 			continue;
 		}