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

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Date:   Tue, 13 Feb 2018 09:38:48 -0800
From:   Santosh Shilimkar <santosh.shilimkar@...cle.com>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.com>,
        netdev <netdev@...r.kernel.org>
Cc:     "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH V2 net-next] rds: do not call ->conn_alloc with GFP_KERNEL


On 2/13/2018 9:05 AM, Sowmini Varadhan wrote:
> 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>
> ---
Acked-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>