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<22e50a64-ea78-4ac7-8680-845b7651db07@est.tech> Date: Tue, 3 Nov 2026 10:13:35 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH] RDMA/iwcm: allow aborting an active connect awaiting CONNECT_REPLY To: Stefan Metzmacher , Bernard Metzler , Leon Romanovsky Cc: Jason Gunthorpe , Jacob Moroni , Bart Van Assche , Namjae Jeon , Tom Talpey , Yunseong Kim , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org References: <20260805000159.321645-2-yunseong.kim@est.tech> <20260901124103.GL24140@unreal> <47142579-3af7-453b-875c-ff6d610f26a7@samba.org> <46f83a1c-02ed-4c64-9eeb-2fc435fdfb24@linux.dev> <473d9515-b951-4cff-a553-b8ed471d0112@samba.org> Content-Language: en-US From: Yunseong Kim In-Reply-To: <473d9515-b951-4cff-a553-b8ed471d0112@samba.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: DUZP191CA0002.EURP191.PROD.OUTLOOK.COM (2603:10a6:10:4f9::12) To 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X-MS-Exchange-CrossTenant-UserPrincipalName: x6WqB+XZ7JntxW0COBQTrH/WoTwNU1nbB8djWPnlUqkZGJYuSIKiaJUkNtGS9/X3qwJO8qADlPx88JuE76aYVg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9P189MB3527 Hi Stefan, On 16/10/2026 11:25 am, Stefan Metzmacher wrote: > Am 03.09.26 um 12:42 schrieb Bernard Metzler: >> On 01.09.2026 18:50, Stefan Metzmacher wrote: >>> Hi Leon, >>> >>>> On Wed, Aug 05, 2026 at 02:02:00AM +0200, Yunseong Kim wrote: >>>>> [snip...] > It actually still hangs in here: > >     For an active iWarp connect that is still waiting for the MPA reply >     (e.g. the peer accepted the TCP connection, but never answers the >     MPA request), irdma doesn't flush the marker before the pending >     connect is aborted, which only happens in rdma_destroy_id(). >     smbdirect_socket_destroy_sync() calls ib_drain_qp() before that, so >     it waits forever: > >       __ib_drain_sq+0x139/0x1b0 [ib_core] >       ib_drain_sq+0x7f/0x90 [ib_core] >       ib_drain_qp+0x16/0x40 [ib_core] >       smbdirect_socket_destroy_sync+0x2bd/0xa90 [smbdirect] >       smbdirect_socket_release+0x61/0xb0 [smbdirect] >       smbd_get_connection+0x22c/0x280 [cifs] > > > Here's my work in progress branch to fix these problems: > https://git.samba.org/?p=metze/linux/wip.git;a=shortlog;h=refs/heads/for-7.3/rdma-backport-testing Thank you again for checking this! > There I'm able to eliminate all hangs I was able to reproduce with siw, rxe, iw_cxgb4, irdma, mlx5_ib. > I tested the following situations: > - server iptables drop (port 5445 and 4791) > - server nc -lk 5445 (tcp connection accepted by no responses) > - ip address del (on the client) > - ip link down (on the client) > > It likely takes a while until I rechecked all commits > and submit them in small chunks, but it's good to see > that it's possible to avoid deadlocks or very large timeouts. > > So at least that patch doesn't solve all problems. > > metze I'll also rerun my automated tests based on your branch when I have some time. Best regards, Yunseong