linux-kernel - Re: WARNING in __local_bh_enable

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Message-ID: <20180314213354.GH24557@oracle.com>
Date:   Wed, 14 Mar 2018 17:33:54 -0400
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     syzbot <syzbot+c68e51bb5e699d3f8d91@...kaller.appspotmail.com>,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        rds-devel@....oracle.com, santosh.shilimkar@...cle.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in __local_bh_enable_ip (2)

On (03/14/18 14:28), Eric Dumazet wrote:
> 
> 
> spin_lock_bh(&rds_tcp_conn_lock);/spin_unlock_bh(&rds_tcp_conn_lock); in
> rds_tcp_conn_free()
> 
> is in conflict with the spin_lock_irqsave(&rds_conn_lock, flags);
> in __rds_conn_create()

yes I was going to look into this and fix it later.

> Hard to understand why RDS is messing with hard irqs really.

some of it comes from the rds_rdma history: some parts of
the common rds and rds_rdma module get called in various
driver contexts for infiniband.

--Sowmini