Hi,
On Sat, Apr 30, 2016 at 12:54:12PM -0700, Eric Dumazet wrote:
> On Sat, 2016-04-30 at 22:24 +0300, Aaro Koskinen wrote:
> > Hi,
> >
> > I have old NAS box (Thecus N2100) with 512 MB RAM, where rsync from NFS ->
> > disk reliably results in temporary out-of-memory conditions.
> >
> > When this happens the dmesg gets flooded with below logs. If the serial
> > console logging is enabled, this will lock up the box completely and
> > the backup is not making any progress.
> >
> > Shouldn't these allocation failures be ratelimited somehow (or even made
> > silent)? It doesn't sound right if I can lock up the system simply by
> > copying files...
>
> Agreed.
>
> All napi_alloc_skb() callers handle failure just fine.
>
> If they did not, a NULL deref would produce a proper stack dump.
>
> When memory gets this tight, other traces will be dumped anyway.
>
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 15d0df943466..0652709fe81a 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -2423,7 +2423,7 @@ struct sk_buff *__napi_alloc_skb(struct napi_struct
> *napi,
> static inline struct sk_buff *napi_alloc_skb(struct napi_struct *napi,
> unsigned int length)
> {
> - return __napi_alloc_skb(napi, length, GFP_ATOMIC);
> + return __napi_alloc_skb(napi, length, GFP_ATOMIC | __GFP_NOWARN);
> }
> void napi_consume_skb(struct sk_buff *skb, int budget);
Care to send this as a formal patch, so I can reply with my Tested-by?
A.
