netdev - Re: [PATCH V2 net-next] rds: do not call ->conn_alloc with GFP

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Message-Id: <20180213.154111.361451446970793827.davem@davemloft.net>
Date:   Tue, 13 Feb 2018 15:41:11 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     sowmini.varadhan@...cle.com
Cc:     netdev@...r.kernel.org, santosh.shilimkar@...cle.com
Subject: Re: [PATCH V2 net-next] rds: do not call ->conn_alloc with
 GFP_KERNEL

From: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Date: Tue, 13 Feb 2018 09:05:44 -0800

> Commit ebeeb1ad9b8a ("rds: tcp: use rds_destroy_pending() to synchronize
> netns/module teardown and rds connection/workq management")
> adds an rcu read critical section to __rd_conn_create. The
> memory allocations in that critcal section need to use
> GFP_ATOMIC to avoid sleeping.
> 
> This patch was verified with syzkaller reproducer.
> 
> Fixes: ebeeb1ad9b8a ("rds: tcp: use rds_destroy_pending() to synchronize
>        netns/module teardown and rds connection/workq management")
> Reported-by: syzbot+a0564419941aaae3fe3c@...kaller.appspotmail.com
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
> ---
> v2: do not over-engineer. Keep the gfp arg to ->conn_alloc simple.

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