From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3089438757D for ; Fri, 10 Jul 2026 19:23:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783711396; cv=none; b=nnuuVypa718owH4cGLCOlNBAp8UiYYcFC/KhhIved9mgxAaNuLlExYs1fyayG72vILZrIbJ+TJUbsz6Kipor5zZHv8ALlSqAhro5eSYDbrZRjsDB0S7ZTAWUrrC4P/8wq4LxxXk8/oBZSYk2/T/sD8/Gyw1KiVN11UD7ET1Qm8E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783711396; c=relaxed/simple; bh=LLqegErpiwnNJz+6QEiPVr0B0jHHttmhiT2gIzb7tbI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DNy6zSUF6XLSBt5gDRSGz0a8a9lLjjyvSum0nmtv6gUqSTWfxGsk4FysGxXvKezEBPVupphqWWS5Q/ZGNxHjFx5KLZD6glBhnkFfy01po3zar9t/y0XiGcAHYzTV+GRRH/gSp/0gY25eRzZJGBTrIEOeuuLLFSi4cnWp8jo5PGQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Np3r/wGN; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Np3r/wGN" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1783711392; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=n0U90slAaEmIBgfeuUR2Wm/d5X06U5sN8cTBSeFBj2M=; b=Np3r/wGNevA0xUzuE/+SZ9HFEMcj1ejZPdMjCWteKZbhwyYq9kzWiO00gkMn8xSEEe3UZU HrdyR7aGaYwN0ltBP5Qiu6Oyy7XxzYyTGShLrl3+QMWVqcXRO1467upOaWW4eb8idtPU/0 PyRLJHkFk94J11GI4ilXiaynxXDGb1E= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-314-phVqJ_nvNE6ZtVwKWSiRJQ-1; Fri, 10 Jul 2026 15:23:08 -0400 X-MC-Unique: phVqJ_nvNE6ZtVwKWSiRJQ-1 X-Mimecast-MFC-AGG-ID: phVqJ_nvNE6ZtVwKWSiRJQ_1783711387 Received: from mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.95]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 44ADF180058D; Fri, 10 Jul 2026 19:23:07 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.33.159]) by mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 387E030A8; Fri, 10 Jul 2026 19:23:03 +0000 (UTC) From: David Howells To: netdev@vger.kernel.org Cc: David Howells , Marc Dionne , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, stable@kernel.org Subject: [PATCH net v2 08/16] rxrpc: Fix generation of notifications after call completion Date: Fri, 10 Jul 2026 20:22:10 +0100 Message-ID: <20260710192220.1922433-9-dhowells@redhat.com> In-Reply-To: <20260710192220.1922433-1-dhowells@redhat.com> References: <20260710192220.1922433-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.6 on 10.30.177.95 AF_RXRPC may generate a notification to the application after a call has completed because it generates one notification when rxrpc_input_split_jumbo() queues the final packet and completes the call and then generates another when rxrpc_input_split_jumbo() does the aggregated data receive notification at the end of the function. This might cause the AFS filesystem to malfunction because it tries to queue the afs_call for processing an extra time. Most of the time this happens quickly enough that the second queue_work skips, but sometimes this means that the call work may happen a second time with implications for afs_call lifetime management. Fix this by: (1) Create a lighter version of rxrpc_notify_socket() that's just used to requeue a call for rxrpc_recvmsg() without creating another notification. (2) Move rxrpc_notify_socket() to call_state.c and rename it to __rxrpc_notify_socket(). (3) Create a wrapper called rxrpc_notify_socket() that skips the notification if a call is completed. (4) Make rxrpc_set_call_completion() call __rxrpc_notify_socket() to avoid the skip-if-completed check. Fixes: 2d1faf7a0ca3 ("rxrpc: Simplify skbuff accounting in receive path") Signed-off-by: David Howells cc: Marc Dionne cc: Eric Dumazet cc: "David S. Miller" cc: Jakub Kicinski cc: Paolo Abeni cc: Simon Horman cc: linux-afs@lists.infradead.org cc: stable@kernel.org --- include/trace/events/rxrpc.h | 1 + net/rxrpc/call_state.c | 57 +++++++++++++++++++++++++++++++++++- net/rxrpc/recvmsg.c | 42 +++++++++----------------- 3 files changed, 71 insertions(+), 29 deletions(-) diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h index 8f3e3967885a..d7c7b04d69fc 100644 --- a/include/trace/events/rxrpc.h +++ b/include/trace/events/rxrpc.h @@ -343,6 +343,7 @@ EM(rxrpc_call_see_distribute_error, "SEE dist-err") \ EM(rxrpc_call_see_input, "SEE input ") \ EM(rxrpc_call_see_notify_released, "SEE nfy-rlsd") \ + EM(rxrpc_call_see_notify_skipped, "SEE nfy-skip") \ EM(rxrpc_call_see_recvmsg, "SEE recvmsg ") \ EM(rxrpc_call_see_recvmsg_requeue, "SEE recv-rqu") \ EM(rxrpc_call_see_recvmsg_requeue_first, "SEE recv-rqF") \ diff --git a/net/rxrpc/call_state.c b/net/rxrpc/call_state.c index 6afb54373ebb..6e402312e145 100644 --- a/net/rxrpc/call_state.c +++ b/net/rxrpc/call_state.c @@ -7,6 +7,61 @@ #include "ar-internal.h" +/* + * Post a call for attention by the socket or kernel service. Further + * notifications are suppressed by putting recvmsg_link on a dummy queue. + */ +static void __rxrpc_notify_socket(struct rxrpc_call *call) +{ + struct rxrpc_sock *rx; + struct sock *sk; + + if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) { + rxrpc_see_call(call, rxrpc_call_see_notify_released); + return; + } + + rcu_read_lock(); + + rx = rcu_dereference(call->socket); + sk = &rx->sk; + if (rx && sk->sk_state < RXRPC_CLOSE) { + if (call->notify_rx) { + spin_lock_irq(&call->notify_lock); + call->notify_rx(sk, call, call->user_call_ID); + spin_unlock_irq(&call->notify_lock); + } else { + spin_lock_irq(&rx->recvmsg_lock); + if (list_empty(&call->recvmsg_link)) { + rxrpc_get_call(call, rxrpc_call_get_notify_socket); + list_add_tail(&call->recvmsg_link, &rx->recvmsg_q); + } + spin_unlock_irq(&rx->recvmsg_lock); + + if (!sock_flag(sk, SOCK_DEAD)) { + _debug("call %ps", sk->sk_data_ready); + sk->sk_data_ready(sk); + } + } + } + + rcu_read_unlock(); +} + +/* + * Post a call for attention by the socket or kernel service. Further + * notifications are suppressed by putting recvmsg_link on a dummy queue. + */ +void rxrpc_notify_socket(struct rxrpc_call *call) +{ + if (rxrpc_call_is_complete(call)) { + rxrpc_see_call(call, rxrpc_call_see_notify_skipped); + return; + } + + __rxrpc_notify_socket(call); +} + /* * Transition a call to the complete state. */ @@ -25,7 +80,7 @@ bool rxrpc_set_call_completion(struct rxrpc_call *call, rxrpc_set_call_state(call, RXRPC_CALL_COMPLETE); trace_rxrpc_call_complete(call); wake_up(&call->waitq); - rxrpc_notify_socket(call); + __rxrpc_notify_socket(call); return true; } diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c index efcba4b2e74f..28b2148b5693 100644 --- a/net/rxrpc/recvmsg.c +++ b/net/rxrpc/recvmsg.c @@ -17,13 +17,12 @@ #include "ar-internal.h" /* - * Post a call for attention by the socket or kernel service. Further - * notifications are suppressed by putting recvmsg_link on a dummy queue. + * Requeue a call for recvmsg() to pick up. */ -void rxrpc_notify_socket(struct rxrpc_call *call) +static void rxrpc_requeue_call(struct socket *sock, struct rxrpc_call *call) { - struct rxrpc_sock *rx; - struct sock *sk; + struct rxrpc_sock *rx = rxrpc_sk(sock->sk); + struct sock *sk = &rx->sk; _enter("%d", call->debug_id); @@ -32,31 +31,18 @@ void rxrpc_notify_socket(struct rxrpc_call *call) return; } - rcu_read_lock(); - - rx = rcu_dereference(call->socket); - sk = &rx->sk; - if (rx && sk->sk_state < RXRPC_CLOSE) { - if (call->notify_rx) { - spin_lock_irq(&call->notify_lock); - call->notify_rx(sk, call, call->user_call_ID); - spin_unlock_irq(&call->notify_lock); - } else { - spin_lock_irq(&rx->recvmsg_lock); - if (list_empty(&call->recvmsg_link)) { - rxrpc_get_call(call, rxrpc_call_get_notify_socket); - list_add_tail(&call->recvmsg_link, &rx->recvmsg_q); - } - spin_unlock_irq(&rx->recvmsg_lock); + spin_lock_irq(&rx->recvmsg_lock); + if (list_empty(&call->recvmsg_link)) { + rxrpc_get_call(call, rxrpc_call_get_notify_socket); + list_add_tail(&call->recvmsg_link, &rx->recvmsg_q); + } + spin_unlock_irq(&rx->recvmsg_lock); - if (!sock_flag(sk, SOCK_DEAD)) { - _debug("call %ps", sk->sk_data_ready); - sk->sk_data_ready(sk); - } - } + if (!sock_flag(sk, SOCK_DEAD)) { + _debug("call %ps", sk->sk_data_ready); + sk->sk_data_ready(sk); } - rcu_read_unlock(); _leave(""); } @@ -561,7 +547,7 @@ int rxrpc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, if (!(flags & MSG_PEEK) && !skb_queue_empty(&call->recvmsg_queue)) - rxrpc_notify_socket(call); + rxrpc_requeue_call(sock, call); goto not_yet_complete; call_failed: