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tcp: fix SO_RCVLOWAT related hangs under mem pressure

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While commit 24adbc1676 ("tcp: fix SO_RCVLOWAT hangs with fat skbs")
fixed an issue vs too small sk_rcvbuf for given sk_rcvlowat constraint,
it missed to address issue caused by memory pressure.

1) If we are under memory pressure and socket receive queue is empty.
First incoming packet is allowed to be queued, after commit
76dfa60820 ("tcp: allow one skb to be received per socket under memory pressure")

But we do not send EPOLLIN yet, in case tcp_data_ready() sees sk_rcvlowat
is bigger than skb length.

2) Then, when next packet comes, it is dropped, and we directly
call sk->sk_data_ready().

3) If application is using poll(), tcp_poll() will then use
tcp_stream_is_readable() and decide the socket receive queue is
not yet filled, so nothing will happen.

Even when sender retransmits packets, phases 2) & 3) repeat
and flow is effectively frozen, until memory pressure is off.

Fix is to consider tcp_under_memory_pressure() to take care
of global memory pressure or memcg pressure.

Fixes: 24adbc1676 ("tcp: fix SO_RCVLOWAT hangs with fat skbs")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Arjun Roy <arjunroy@google.com>
Suggested-by: Wei Wang <weiwan@google.com>
Reviewed-by: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2021-02-12 15:22:13 -08:00 committed by David S. Miller
parent 5cdaf9d6fa
commit f969dc5a88
1 changed files with 7 additions and 2 deletions
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9
include/net/tcp.h
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@ -1431,8 +1431,13 @@ void tcp_cleanup_rbuf(struct sock *sk, int copied);
*/
static inline bool tcp_rmem_pressure(const struct sock *sk)
{
int rcvbuf = READ_ONCE(sk->sk_rcvbuf);
int threshold = rcvbuf - (rcvbuf >> 3);
int rcvbuf, threshold;
if (tcp_under_memory_pressure(sk))
return true;
rcvbuf = READ_ONCE(sk->sk_rcvbuf);
threshold = rcvbuf - (rcvbuf >> 3);
return atomic_read(&sk->sk_rmem_alloc) > threshold;
}