From nobody Fri Apr 10 17:48:26 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 DEEB73C13FC for ; Wed, 8 Apr 2026 12:13:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775650442; cv=none; b=mG4SKRXLzxX+M0j6DrjcN2PRfwo+2ssq3avITx1yP7+GMttrz0nKWF8W0ewWDo/8hyH6R0PThHdEN2QXb6Poll5yjMfUZeSgljH/zixUtcRpYziuMAsh7JI7C3qgsK21WWpZmG9JOf3PMAqZvmoJuLYLf6baJLAYWmnVnoBv6XA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775650442; c=relaxed/simple; bh=c65U58IymmhFs6mm6gCyGxJ220gcEnGj2kP2z0DZZkI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nbJDY7pjyrLIg4fiOrrRCsC439ufKo42lUs7jTFHQ5Ilt0GMOh3t/FLy61kmOHG0KNNWeIsRs4DaIO/kr71IoeO0a8VQGqwapKZciu+hSBO5ptUqaqfnE4mylNS3yg0Uh/RXsEyNJogylKHSxl2+gSmmyDEYpCIoXbxLt1rckHU= 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=bx39SdRS; arc=none smtp.client-ip=170.10.129.124 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="bx39SdRS" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1775650434; 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=G0naaNtpjzkU1+nfEy3HMUBkaru1VrZvHmnSx79IMDc=; b=bx39SdRSItZPzBYI1kGN0cDp7/7ufUpnktB26iafXSPq1ZpTRrneZh2+wMZgc3kha1GELs QeKnSt+KuB6n/6oW5UTY0U4HAnqjP2gUPyZkS1F3FiURpnRAgN/HE8dEFu+V/y68PBVT0S LfGAbc6pUUAHX/vNZBY+wg5azZkZk18= Received: from mx-prod-mc-05.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-631-ae_G_KntNge-9qT3XoGwhA-1; Wed, 08 Apr 2026 08:13:51 -0400 X-MC-Unique: ae_G_KntNge-9qT3XoGwhA-1 X-Mimecast-MFC-AGG-ID: ae_G_KntNge-9qT3XoGwhA_1775650427 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (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-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id ABDA91955DBB; Wed, 8 Apr 2026 12:13:46 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.32.94]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 4D9DF1955D84; Wed, 8 Apr 2026 12:13:18 +0000 (UTC) From: David Howells To: netdev@vger.kernel.org Cc: David Howells , Marc Dionne , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, Jeffrey Altman , Linus Torvalds , Simon Horman , stable@kernel.org Subject: [PATCH net v5 04/21] rxrpc: Fix call removal to use RCU safe deletion Date: Wed, 8 Apr 2026 13:12:32 +0100 Message-ID: <20260408121252.2249051-5-dhowells@redhat.com> In-Reply-To: <20260408121252.2249051-1-dhowells@redhat.com> References: <20260408121252.2249051-1-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: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Content-Type: text/plain; charset="utf-8" Fix rxrpc call removal from the rxnet->calls list to use list_del_rcu() rather than list_del_init() to prevent stuffing up reading /proc/net/rxrpc/calls from potentially getting into an infinite loop. This, however, means that list_empty() no longer works on an entry that's been deleted from the list, making it harder to detect prior deletion. Fix this by: Firstly, make rxrpc_destroy_all_calls() only dump the first ten calls that are unexpectedly still on the list. Limiting the number of steps means there's no need to call cond_resched() or to remove calls from the list here, thereby eliminating the need for rxrpc_put_call() to check for that. rxrpc_put_call() can then be fixed to unconditionally delete the call from the list as it is the only place that the deletion occurs. Fixes: 2baec2c3f854 ("rxrpc: Support network namespacing") Closes: https://sashiko.dev/#/patchset/20260319150150.4189381-1-dhowells%40= redhat.com Signed-off-by: David Howells cc: Marc Dionne cc: Jeffrey Altman cc: Linus Torvalds cc: Eric Dumazet cc: "David S. Miller" cc: Jakub Kicinski cc: Paolo Abeni cc: Simon Horman cc: linux-afs@lists.infradead.org cc: netdev@vger.kernel.org cc: stable@kernel.org --- include/trace/events/rxrpc.h | 2 +- net/rxrpc/call_object.c | 24 +++++++++--------------- 2 files changed, 10 insertions(+), 16 deletions(-) diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h index 869f97c9bf73..a826cd80007b 100644 --- a/include/trace/events/rxrpc.h +++ b/include/trace/events/rxrpc.h @@ -347,7 +347,7 @@ 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 ") + E_(rxrpc_call_see_still_live, "SEE !still-l") =20 #define rxrpc_txqueue_traces \ EM(rxrpc_txqueue_await_reply, "AWR") \ diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c index 918f41d97a2f..59329cfe1532 100644 --- a/net/rxrpc/call_object.c +++ b/net/rxrpc/call_object.c @@ -654,11 +654,9 @@ void rxrpc_put_call(struct rxrpc_call *call, enum rxrp= c_call_trace why) if (dead) { ASSERTCMP(__rxrpc_call_state(call), =3D=3D, RXRPC_CALL_COMPLETE); =20 - if (!list_empty(&call->link)) { - spin_lock(&rxnet->call_lock); - list_del_init(&call->link); - spin_unlock(&rxnet->call_lock); - } + spin_lock(&rxnet->call_lock); + list_del_rcu(&call->link); + spin_unlock(&rxnet->call_lock); =20 rxrpc_cleanup_call(call); } @@ -730,24 +728,20 @@ void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) _enter(""); =20 if (!list_empty(&rxnet->calls)) { - spin_lock(&rxnet->call_lock); + int shown =3D 0; =20 - while (!list_empty(&rxnet->calls)) { - call =3D list_entry(rxnet->calls.next, - struct rxrpc_call, link); - _debug("Zapping call %p", call); + spin_lock(&rxnet->call_lock); =20 - rxrpc_see_call(call, rxrpc_call_see_zap); - list_del_init(&call->link); + list_for_each_entry(call, &rxnet->calls, link) { + rxrpc_see_call(call, rxrpc_call_see_still_live); =20 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", call, refcount_read(&call->ref), rxrpc_call_states[__rxrpc_call_state(call)], call->flags, call->events); =20 - spin_unlock(&rxnet->call_lock); - cond_resched(); - spin_lock(&rxnet->call_lock); + if (++shown >=3D 10) + break; } =20 spin_unlock(&rxnet->call_lock);