Re: ppoll() stuck on POLLIN while TCP peer is sending

Eric Wong [off-list ref] wrote:

Eric Dumazet [off-list ref] wrote:

quoted

On Tue, 2013-01-08 at 18:32 -0800, Eric Dumazet wrote:

quoted

Hmm, it seems sk_filter() can return -ENOMEM because skb has the
pfmemalloc() set.

quoted

One TCP socket keeps retransmitting an SKB via loopback, and TCP stack 
drops the packet again and again.

sock_init_data() sets sk->sk_allocation to GFP_KERNEL

Shouldnt it use (GFP_KERNEL | __GFP_NOMEMALLOC) instead ?

Thanks, things are running good after ~35 minutes so far.
Will report back if things break (hopefully I don't run out
of laptop battery power :x).

Oops, I had to restart my test :x.  However, I was able to reproduce the
issue very quickly again with your patch.  I've double-checked I'm
booting into the correct kernel, but I do have more load on this
laptop host now, so maybe that made it happen more quickly...

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