netdev - Re: [PATCH net-next 3/3] rds: tcp: atomically purge entries from rds_tcp_conn

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Date:   Thu, 30 Nov 2017 12:38:21 -0800
From:   Santosh Shilimkar <santosh.shilimkar@...cle.com>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.com>,
        netdev@...r.kernel.org
Cc:     davem@...emloft.net, rds-devel@....oracle.com
Subject: Re: [PATCH net-next 3/3] rds: tcp: atomically purge entries from
 rds_tcp_conn_list during netns delete

On 11/30/2017 11:11 AM, Sowmini Varadhan wrote:
> The rds_tcp_kill_sock() function parses the rds_tcp_conn_list
> to find the rds_connection entries marked for deletion as part
> of the netns deletion under the protection of the rds_tcp_conn_lock.
> Since the rds_tcp_conn_list tracks rds_tcp_connections (which
> have a 1:1 mapping with rds_conn_path), multiple tc entries in
> the rds_tcp_conn_list will map to a single rds_connection, and will
> be deleted as part of the rds_conn_destroy() operation that is
> done outside the rds_tcp_conn_lock.
> 
> The rds_tcp_conn_list traversal done under the protection of
> rds_tcp_conn_lock should not leave any doomed tc entries in
> the list after the rds_tcp_conn_lock is released, else another
> concurrently executiong netns delete (for a differnt netns) thread
> may trip on these entries.
> 
> Reported-by: syzbot <syzkaller@...glegroups.com>
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
> ---
Acked-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>