linux-kernel - Re: net/dccp: warning in dccp_feat_clone_sp_val/__might

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Message-ID: <1477762981.7065.272.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Sat, 29 Oct 2016 10:43:01 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Gerrit Renker <gerrit@....abdn.ac.uk>,
        "David S. Miller" <davem@...emloft.net>, dccp@...r.kernel.org,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: net/dccp: warning in dccp_feat_clone_sp_val/__might_sleep

On Sat, 2016-10-29 at 19:06 +0200, Andrey Konovalov wrote:
> Hi Cong,
> 
> Tested with your patch, still getting a warning, though it's a little different:
> 
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 3876 at kernel/sched/core.c:7724
> __might_sleep+0x14c/0x1a0 kernel/sched/core.c:7719
> do not call blocking ops when !TASK_RUNNING; state=1 set at
> [<ffffffff811f5a5c>] prepare_to_wait+0xbc/0x210
> kernel/sched/wait.c:178
> Modules linked in:

This looks like the following patch is needed, can you test it ?
Thanks !

diff --git a/net/dccp/output.c b/net/dccp/output.c
index b66c84db0766..74d8583a0d52 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -228,6 +228,7 @@ static int dccp_wait_for_ccid(struct sock *sk, unsigned long delay)
 
 	remaining = schedule_timeout(delay);
 
+	sched_annotate_sleep();
 	lock_sock(sk);
 	sk->sk_write_pending--;
 	finish_wait(sk_sleep(sk), &wait);