From nobody Sun Nov 24 07:29:09 2024 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 6AA471F4297 for ; Wed, 6 Nov 2024 13:03:31 +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=1730898214; cv=none; b=Q8KmBk7MIZYb3eEJK0BUO3Tzx6h45pHBtmGmYNhR/5LjDzks1EoGEHiFLRbN95mQd14h300DRJJ/omaAnypNEjqXtv9xQGi3pYEs1scLx1nnDG4wBSBaGQonAMDma1bePNNLyshcup2sWLW1uoqAI6zCceLBR6Y/Q5eDCtZHQDc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730898214; c=relaxed/simple; bh=GyHaXBpas0Jk5Yxydrz5kNdf95Ahw0pvB2pioizFJF8=; h=From:To:cc:Subject:MIME-Version:Content-Type:Date:Message-ID; b=pEPRolLjxvADJflNKAaimiGGJhPu1+Ibv9Uh7HymbHN6kU+HdLYIq/OUfwHnIGor4CGC0DnSlCaBBYvOfwRzRU+8fZ0y6PAlXEuPqvY7h0zl4IULmTzwDMSw3iqJh85oODOHnR0ikzpR9jrtM7+wWiQguGeaziRb58fR8qIRcxE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none 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=d/hbWg1U; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none 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="d/hbWg1U" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1730898210; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=fxGSqNGg1Goa58e13x+V5i9uNNuZ+24Z3hxIk+gVXhQ=; b=d/hbWg1UWd2KGHHnfH0BTTEAYDJcuO+v3L5ZK+GBg7cDdHRPkj+ngpgIK/bLr1nM4ZNgcB XuXjTFsgUg+3NJy3OycJSqnPhsbP67uyHgwrlGVaqFwXeVEHDiw6wtUzYnY5qAdWGpbJSU TgUHBFjNWNYv7dEmcVe4VsBhh0SYwQc= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-300-OQPL5yXXMMuRWECWD_vg7g-1; Wed, 06 Nov 2024 08:03:27 -0500 X-MC-Unique: OQPL5yXXMMuRWECWD_vg7g-1 X-Mimecast-MFC-AGG-ID: OQPL5yXXMMuRWECWD_vg7g Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (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-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D7B681955EAC; Wed, 6 Nov 2024 13:03:25 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.42.28.231]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 54E5F195605A; Wed, 6 Nov 2024 13:03:23 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells To: netdev@vger.kernel.org cc: dhowells@redhat.com, Marc Dionne , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH net] rxrpc: Fix missing locking causing hanging calls Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-ID: <726659.1730898202.1@warthog.procyon.org.uk> Content-Transfer-Encoding: quoted-printable Date: Wed, 06 Nov 2024 13:03:22 +0000 Message-ID: <726660.1730898202@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Content-Type: text/plain; charset="utf-8" If a call gets aborted (e.g. because kafs saw a signal) between it being queued for connection and the I/O thread picking up the call, the abort will be prioritised over the connection and it will be removed from local->new_client_calls by rxrpc_disconnect_client_call() without a lock being held. This may cause other calls on the list to disappear if a race occurs. Fix this by taking the client_call_lock when removing a call from whatever list its ->wait_link happens to be on. Signed-off-by: David Howells cc: Marc Dionne cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: Simon Horman cc: linux-afs@lists.infradead.org cc: netdev@vger.kernel.org Reported-by: Marc Dionne --- include/trace/events/rxrpc.h | 1 + net/rxrpc/conn_client.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h index c2f087e90fbe..d03e0bd8c028 100644 --- a/include/trace/events/rxrpc.h +++ b/include/trace/events/rxrpc.h @@ -287,6 +287,7 @@ EM(rxrpc_call_see_input, "SEE input ") \ EM(rxrpc_call_see_release, "SEE release ") \ EM(rxrpc_call_see_userid_exists, "SEE u-exists") \ + EM(rxrpc_call_see_waiting_call, "SEE q-conn ") \ E_(rxrpc_call_see_zap, "SEE zap ") =20 #define rxrpc_txqueue_traces \ diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c index d25bf1cf3670..bb11e8289d6d 100644 --- a/net/rxrpc/conn_client.c +++ b/net/rxrpc/conn_client.c @@ -516,6 +516,7 @@ void rxrpc_connect_client_calls(struct rxrpc_local *loc= al) =20 spin_lock(&local->client_call_lock); list_move_tail(&call->wait_link, &bundle->waiting_calls); + rxrpc_see_call(call, rxrpc_call_see_waiting_call); spin_unlock(&local->client_call_lock); =20 if (rxrpc_bundle_has_space(bundle)) @@ -586,7 +587,10 @@ void rxrpc_disconnect_client_call(struct rxrpc_bundle = *bundle, struct rxrpc_call _debug("call is waiting"); ASSERTCMP(call->call_id, =3D=3D, 0); ASSERT(!test_bit(RXRPC_CALL_EXPOSED, &call->flags)); + /* May still be on ->new_client_calls. */ + spin_lock(&local->client_call_lock); list_del_init(&call->wait_link); + spin_unlock(&local->client_call_lock); return; } =20