Re: INFO: rcu detected stall in vprintk_func

[Sergey Senozhatsky]

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;
                }