Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 583 insertions, 0 deletions

diff --git a/net/rxrpc/io_thread.c b/net/rxrpc/io_thread.c
new file mode 100644
index 000000000..dc5184a2f
--- /dev/null
+++ b/net/rxrpc/io_thread.c
@@ -0,0 +1,583 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* RxRPC packet reception
+ *
+ * Copyright (C) 2007, 2016, 2022 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include "ar-internal.h"
+
+static int rxrpc_input_packet_on_conn(struct rxrpc_connection *conn,
+				      struct sockaddr_rxrpc *peer_srx,
+				      struct sk_buff *skb);
+
+/*
+ * handle data received on the local endpoint
+ * - may be called in interrupt context
+ *
+ * [!] Note that as this is called from the encap_rcv hook, the socket is not
+ * held locked by the caller and nothing prevents sk_user_data on the UDP from
+ * being cleared in the middle of processing this function.
+ *
+ * Called with the RCU read lock held from the IP layer via UDP.
+ */
+int rxrpc_encap_rcv(struct sock *udp_sk, struct sk_buff *skb)
+{
+	struct sk_buff_head *rx_queue;
+	struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk);
+	struct task_struct *io_thread;
+
+	if (unlikely(!local)) {
+		kfree_skb(skb);
+		return 0;
+	}
+	io_thread = READ_ONCE(local->io_thread);
+	if (!io_thread) {
+		kfree_skb(skb);
+		return 0;
+	}
+	if (skb->tstamp == 0)
+		skb->tstamp = ktime_get_real();
+
+	skb->mark = RXRPC_SKB_MARK_PACKET;
+	rxrpc_new_skb(skb, rxrpc_skb_new_encap_rcv);
+	rx_queue = &local->rx_queue;
+#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
+	if (rxrpc_inject_rx_delay ||
+	    !skb_queue_empty(&local->rx_delay_queue)) {
+		skb->tstamp = ktime_add_ms(skb->tstamp, rxrpc_inject_rx_delay);
+		rx_queue = &local->rx_delay_queue;
+	}
+#endif
+
+	skb_queue_tail(rx_queue, skb);
+	wake_up_process(io_thread);
+	return 0;
+}
+
+/*
+ * Handle an error received on the local endpoint.
+ */
+void rxrpc_error_report(struct sock *sk)
+{
+	struct rxrpc_local *local;
+	struct sk_buff *skb;
+
+	rcu_read_lock();
+	local = rcu_dereference_sk_user_data(sk);
+	if (unlikely(!local)) {
+		rcu_read_unlock();
+		return;
+	}
+
+	while ((skb = skb_dequeue(&sk->sk_error_queue))) {
+		skb->mark = RXRPC_SKB_MARK_ERROR;
+		rxrpc_new_skb(skb, rxrpc_skb_new_error_report);
+		skb_queue_tail(&local->rx_queue, skb);
+	}
+
+	rxrpc_wake_up_io_thread(local);
+	rcu_read_unlock();
+}
+
+/*
+ * Directly produce an abort from a packet.
+ */
+bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
+			s32 abort_code, int err)
+{
+	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+	trace_rxrpc_abort(0, why, sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
+			  abort_code, err);
+	skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
+	skb->priority = abort_code;
+	return false;
+}
+
+/*
+ * Directly produce a connection abort from a packet.
+ */
+bool rxrpc_direct_conn_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
+			     s32 abort_code, int err)
+{
+	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+	trace_rxrpc_abort(0, why, sp->hdr.cid, 0, sp->hdr.seq, abort_code, err);
+	skb->mark = RXRPC_SKB_MARK_REJECT_CONN_ABORT;
+	skb->priority = abort_code;
+	return false;
+}
+
+static bool rxrpc_bad_message(struct sk_buff *skb, enum rxrpc_abort_reason why)
+{
+	return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EBADMSG);
+}
+
+#define just_discard true
+
+/*
+ * Process event packets targeted at a local endpoint.
+ */
+static bool rxrpc_input_version(struct rxrpc_local *local, struct sk_buff *skb)
+{
+	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	char v;
+
+	_enter("");
+
+	rxrpc_see_skb(skb, rxrpc_skb_see_version);
+	if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), &v, 1) >= 0) {
+		if (v == 0)
+			rxrpc_send_version_request(local, &sp->hdr, skb);
+	}
+
+	return true;
+}
+
+/*
+ * Extract the wire header from a packet and translate the byte order.
+ */
+static bool rxrpc_extract_header(struct rxrpc_skb_priv *sp,
+				 struct sk_buff *skb)
+{
+	struct rxrpc_wire_header whdr;
+	struct rxrpc_ackpacket ack;
+
+	/* dig out the RxRPC connection details */
+	if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0)
+		return rxrpc_bad_message(skb, rxrpc_badmsg_short_hdr);
+
+	memset(sp, 0, sizeof(*sp));
+	sp->hdr.epoch		= ntohl(whdr.epoch);
+	sp->hdr.cid		= ntohl(whdr.cid);
+	sp->hdr.callNumber	= ntohl(whdr.callNumber);
+	sp->hdr.seq		= ntohl(whdr.seq);
+	sp->hdr.serial		= ntohl(whdr.serial);
+	sp->hdr.flags		= whdr.flags;
+	sp->hdr.type		= whdr.type;
+	sp->hdr.userStatus	= whdr.userStatus;
+	sp->hdr.securityIndex	= whdr.securityIndex;
+	sp->hdr._rsvd		= ntohs(whdr._rsvd);
+	sp->hdr.serviceId	= ntohs(whdr.serviceId);
+
+	if (sp->hdr.type == RXRPC_PACKET_TYPE_ACK) {
+		if (skb_copy_bits(skb, sizeof(whdr), &ack, sizeof(ack)) < 0)
+			return rxrpc_bad_message(skb, rxrpc_badmsg_short_ack);
+		sp->ack.first_ack	= ntohl(ack.firstPacket);
+		sp->ack.prev_ack	= ntohl(ack.previousPacket);
+		sp->ack.acked_serial	= ntohl(ack.serial);
+		sp->ack.reason		= ack.reason;
+		sp->ack.nr_acks		= ack.nAcks;
+	}
+	return true;
+}
+
+/*
+ * Extract the abort code from an ABORT packet and stash it in skb->priority.
+ */
+static bool rxrpc_extract_abort(struct sk_buff *skb)
+{
+	__be32 wtmp;
+
+	if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
+			  &wtmp, sizeof(wtmp)) < 0)
+		return false;
+	skb->priority = ntohl(wtmp);
+	return true;
+}
+
+/*
+ * Process packets received on the local endpoint
+ */
+static bool rxrpc_input_packet(struct rxrpc_local *local, struct sk_buff *skb)
+{
+	struct rxrpc_connection *conn;
+	struct sockaddr_rxrpc peer_srx;
+	struct rxrpc_skb_priv *sp;
+	struct rxrpc_peer *peer = NULL;
+	bool ret = false;
+
+	skb_pull(skb, sizeof(struct udphdr));
+
+	sp = rxrpc_skb(skb);
+
+	/* dig out the RxRPC connection details */
+	if (!rxrpc_extract_header(sp, skb))
+		return just_discard;
+
+	if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
+		static int lose;
+		if ((lose++ & 7) == 7) {
+			trace_rxrpc_rx_lose(sp);
+			return just_discard;
+		}
+	}
+
+	trace_rxrpc_rx_packet(sp);
+
+	switch (sp->hdr.type) {
+	case RXRPC_PACKET_TYPE_VERSION:
+		if (rxrpc_to_client(sp))
+			return just_discard;
+		return rxrpc_input_version(local, skb);
+
+	case RXRPC_PACKET_TYPE_BUSY:
+		if (rxrpc_to_server(sp))
+			return just_discard;
+		fallthrough;
+	case RXRPC_PACKET_TYPE_ACK:
+	case RXRPC_PACKET_TYPE_ACKALL:
+		if (sp->hdr.callNumber == 0)
+			return rxrpc_bad_message(skb, rxrpc_badmsg_zero_call);
+		break;
+	case RXRPC_PACKET_TYPE_ABORT:
+		if (!rxrpc_extract_abort(skb))
+			return just_discard; /* Just discard if malformed */
+		break;
+
+	case RXRPC_PACKET_TYPE_DATA:
+		if (sp->hdr.callNumber == 0)
+			return rxrpc_bad_message(skb, rxrpc_badmsg_zero_call);
+		if (sp->hdr.seq == 0)
+			return rxrpc_bad_message(skb, rxrpc_badmsg_zero_seq);
+		break;
+
+	case RXRPC_PACKET_TYPE_CHALLENGE:
+		if (rxrpc_to_server(sp))
+			return just_discard;
+		break;
+	case RXRPC_PACKET_TYPE_RESPONSE:
+		if (rxrpc_to_client(sp))
+			return just_discard;
+		break;
+
+		/* Packet types 9-11 should just be ignored. */
+	case RXRPC_PACKET_TYPE_PARAMS:
+	case RXRPC_PACKET_TYPE_10:
+	case RXRPC_PACKET_TYPE_11:
+		return just_discard;
+
+	default:
+		return rxrpc_bad_message(skb, rxrpc_badmsg_unsupported_packet);
+	}
+
+	if (sp->hdr.serviceId == 0)
+		return rxrpc_bad_message(skb, rxrpc_badmsg_zero_service);
+
+	if (WARN_ON_ONCE(rxrpc_extract_addr_from_skb(&peer_srx, skb) < 0))
+		return just_discard; /* Unsupported address type. */
+
+	if (peer_srx.transport.family != local->srx.transport.family &&
+	    (peer_srx.transport.family == AF_INET &&
+	     local->srx.transport.family != AF_INET6)) {
+		pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n",
+				    peer_srx.transport.family,
+				    local->srx.transport.family);
+		return just_discard; /* Wrong address type. */
+	}
+
+	if (rxrpc_to_client(sp)) {
+		rcu_read_lock();
+		conn = rxrpc_find_client_connection_rcu(local, &peer_srx, skb);
+		conn = rxrpc_get_connection_maybe(conn, rxrpc_conn_get_call_input);
+		rcu_read_unlock();
+		if (!conn)
+			return rxrpc_protocol_error(skb, rxrpc_eproto_no_client_conn);
+
+		ret = rxrpc_input_packet_on_conn(conn, &peer_srx, skb);
+		rxrpc_put_connection(conn, rxrpc_conn_put_call_input);
+		return ret;
+	}
+
+	/* We need to look up service connections by the full protocol
+	 * parameter set.  We look up the peer first as an intermediate step
+	 * and then the connection from the peer's tree.
+	 */
+	rcu_read_lock();
+
+	peer = rxrpc_lookup_peer_rcu(local, &peer_srx);
+	if (!peer) {
+		rcu_read_unlock();
+		return rxrpc_new_incoming_call(local, NULL, NULL, &peer_srx, skb);
+	}
+
+	conn = rxrpc_find_service_conn_rcu(peer, skb);
+	conn = rxrpc_get_connection_maybe(conn, rxrpc_conn_get_call_input);
+	if (conn) {
+		rcu_read_unlock();
+		ret = rxrpc_input_packet_on_conn(conn, &peer_srx, skb);
+		rxrpc_put_connection(conn, rxrpc_conn_put_call_input);
+		return ret;
+	}
+
+	peer = rxrpc_get_peer_maybe(peer, rxrpc_peer_get_input);
+	rcu_read_unlock();
+
+	ret = rxrpc_new_incoming_call(local, peer, NULL, &peer_srx, skb);
+	rxrpc_put_peer(peer, rxrpc_peer_put_input);
+	return ret;
+}
+
+/*
+ * Deal with a packet that's associated with an extant connection.
+ */
+static int rxrpc_input_packet_on_conn(struct rxrpc_connection *conn,
+				      struct sockaddr_rxrpc *peer_srx,
+				      struct sk_buff *skb)
+{
+	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	struct rxrpc_channel *chan;
+	struct rxrpc_call *call = NULL;
+	unsigned int channel;
+
+	if (sp->hdr.securityIndex != conn->security_ix)
+		return rxrpc_direct_abort(skb, rxrpc_eproto_wrong_security,
+					  RXKADINCONSISTENCY, -EBADMSG);
+
+	if (sp->hdr.serviceId != conn->service_id) {
+		int old_id;
+
+		if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags))
+			return rxrpc_protocol_error(skb, rxrpc_eproto_reupgrade);
+
+		old_id = cmpxchg(&conn->service_id, conn->orig_service_id,
+				 sp->hdr.serviceId);
+		if (old_id != conn->orig_service_id &&
+		    old_id != sp->hdr.serviceId)
+			return rxrpc_protocol_error(skb, rxrpc_eproto_bad_upgrade);
+	}
+
+	if (after(sp->hdr.serial, conn->hi_serial))
+		conn->hi_serial = sp->hdr.serial;
+
+	/* It's a connection-level packet if the call number is 0. */
+	if (sp->hdr.callNumber == 0)
+		return rxrpc_input_conn_packet(conn, skb);
+
+	/* Deal with path MTU discovery probing. */
+	if (sp->hdr.type == RXRPC_PACKET_TYPE_ACK &&
+	    conn->pmtud_probe &&
+	    after_eq(sp->ack.acked_serial, conn->pmtud_probe))
+		rxrpc_input_probe_for_pmtud(conn, sp->ack.acked_serial, false);
+
+	/* Call-bound packets are routed by connection channel. */
+	channel = sp->hdr.cid & RXRPC_CHANNELMASK;
+	chan = &conn->channels[channel];
+
+	/* Ignore really old calls */
+	if (sp->hdr.callNumber < chan->last_call)
+		return just_discard;
+
+	if (sp->hdr.callNumber == chan->last_call) {
+		if (chan->call ||
+		    sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)
+			return just_discard;
+
+		/* For the previous service call, if completed successfully, we
+		 * discard all further packets.
+		 */
+		if (rxrpc_conn_is_service(conn) &&
+		    chan->last_type == RXRPC_PACKET_TYPE_ACK)
+			return just_discard;
+
+		/* But otherwise we need to retransmit the final packet from
+		 * data cached in the connection record.
+		 */
+		if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA)
+			trace_rxrpc_rx_data(chan->call_debug_id,
+					    sp->hdr.seq,
+					    sp->hdr.serial,
+					    sp->hdr.flags);
+		rxrpc_conn_retransmit_call(conn, skb, channel);
+		return just_discard;
+	}
+
+	call = rxrpc_try_get_call(chan->call, rxrpc_call_get_input);
+
+	if (sp->hdr.callNumber > chan->call_id) {
+		if (rxrpc_to_client(sp)) {
+			if (call)
+				rxrpc_put_call(call, rxrpc_call_put_input);
+			return rxrpc_protocol_error(skb,
+						    rxrpc_eproto_unexpected_implicit_end);
+		}
+
+		if (call) {
+			rxrpc_implicit_end_call(call, skb);
+			rxrpc_put_call(call, rxrpc_call_put_input);
+			call = NULL;
+		}
+	}
+
+	if (!call) {
+		if (rxrpc_to_client(sp))
+			return rxrpc_protocol_error(skb, rxrpc_eproto_no_client_call);
+		return rxrpc_new_incoming_call(conn->local, conn->peer, conn,
+					       peer_srx, skb);
+	}
+
+	rxrpc_queue_rx_call_packet(call, skb);
+	rxrpc_put_call(call, rxrpc_call_put_input);
+	return true;
+}
+
+/*
+ * I/O and event handling thread.
+ */
+int rxrpc_io_thread(void *data)
+{
+	struct rxrpc_connection *conn;
+	struct sk_buff_head rx_queue;
+	struct rxrpc_local *local = data;
+	struct rxrpc_call *call;
+	struct sk_buff *skb;
+#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
+	ktime_t now;
+#endif
+	bool should_stop;
+	LIST_HEAD(conn_attend_q);
+	LIST_HEAD(call_attend_q);
+
+	complete(&local->io_thread_ready);
+
+	skb_queue_head_init(&rx_queue);
+
+	set_user_nice(current, MIN_NICE);
+
+	for (;;) {
+		rxrpc_inc_stat(local->rxnet, stat_io_loop);
+
+		/* Inject a delay into packets if requested. */
+#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
+		now = ktime_get_real();
+		while ((skb = skb_peek(&local->rx_delay_queue))) {
+			if (ktime_before(now, skb->tstamp))
+				break;
+			skb = skb_dequeue(&local->rx_delay_queue);
+			skb_queue_tail(&local->rx_queue, skb);
+		}
+#endif
+
+		if (!skb_queue_empty(&local->rx_queue)) {
+			spin_lock_irq(&local->rx_queue.lock);
+			skb_queue_splice_tail_init(&local->rx_queue, &rx_queue);
+			spin_unlock_irq(&local->rx_queue.lock);
+			trace_rxrpc_iothread_rx(local, skb_queue_len(&rx_queue));
+		}
+
+		/* Distribute packets and errors. */
+		while ((skb = __skb_dequeue(&rx_queue))) {
+			struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+			switch (skb->mark) {
+			case RXRPC_SKB_MARK_PACKET:
+				skb->priority = 0;
+				if (!rxrpc_input_packet(local, skb))
+					rxrpc_reject_packet(local, skb);
+				trace_rxrpc_rx_done(skb->mark, skb->priority);
+				rxrpc_free_skb(skb, rxrpc_skb_put_input);
+				break;
+			case RXRPC_SKB_MARK_ERROR:
+				rxrpc_input_error(local, skb);
+				rxrpc_free_skb(skb, rxrpc_skb_put_error_report);
+				break;
+			case RXRPC_SKB_MARK_SERVICE_CONN_SECURED:
+				rxrpc_input_conn_event(sp->poke_conn, skb);
+				rxrpc_put_connection(sp->poke_conn, rxrpc_conn_put_poke);
+				rxrpc_free_skb(skb, rxrpc_skb_put_conn_secured);
+				break;
+			default:
+				WARN_ON_ONCE(1);
+				rxrpc_free_skb(skb, rxrpc_skb_put_unknown);
+				break;
+			}
+		}
+
+		/* Deal with connections that want immediate attention. */
+		if (!list_empty_careful(&local->conn_attend_q)) {
+			spin_lock_irq(&local->lock);
+			list_splice_tail_init(&local->conn_attend_q, &conn_attend_q);
+			spin_unlock_irq(&local->lock);
+		}
+
+		while ((conn = list_first_entry_or_null(&conn_attend_q,
+							struct rxrpc_connection,
+							attend_link))) {
+			spin_lock_irq(&local->lock);
+			list_del_init(&conn->attend_link);
+			spin_unlock_irq(&local->lock);
+			rxrpc_input_conn_event(conn, NULL);
+			rxrpc_put_connection(conn, rxrpc_conn_put_poke);
+		}
+
+		if (test_and_clear_bit(RXRPC_CLIENT_CONN_REAP_TIMER,
+				       &local->client_conn_flags))
+			rxrpc_discard_expired_client_conns(local);
+
+		/* Deal with calls that want immediate attention. */
+		spin_lock_irq(&local->lock);
+		list_splice_tail_init(&local->call_attend_q, &call_attend_q);
+		spin_unlock_irq(&local->lock);
+
+		while ((call = list_first_entry_or_null(&call_attend_q,
+							struct rxrpc_call,
+							attend_link))) {
+			spin_lock_irq(&local->lock);
+			list_del_init(&call->attend_link);
+			spin_unlock_irq(&local->lock);
+			trace_rxrpc_call_poked(call);
+			rxrpc_input_call_event(call);
+			rxrpc_put_call(call, rxrpc_call_put_poke);
+		}
+
+		if (!list_empty(&local->new_client_calls))
+			rxrpc_connect_client_calls(local);
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		should_stop = kthread_should_stop();
+		if (!skb_queue_empty(&local->rx_queue) ||
+		    !list_empty(&local->call_attend_q) ||
+		    !list_empty(&local->conn_attend_q) ||
+		    !list_empty(&local->new_client_calls) ||
+		    test_bit(RXRPC_CLIENT_CONN_REAP_TIMER,
+			     &local->client_conn_flags)) {
+			__set_current_state(TASK_RUNNING);
+			continue;
+		}
+
+		if (should_stop)
+			break;
+
+#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
+		skb = skb_peek(&local->rx_delay_queue);
+		if (skb) {
+			unsigned long timeout;
+			ktime_t tstamp = skb->tstamp;
+			ktime_t now = ktime_get_real();
+			s64 delay_ns = ktime_to_ns(ktime_sub(tstamp, now));
+
+			if (delay_ns <= 0) {
+				__set_current_state(TASK_RUNNING);
+				continue;
+			}
+
+			timeout = nsecs_to_jiffies(delay_ns);
+			timeout = umax(timeout, 1);
+			schedule_timeout(timeout);
+			__set_current_state(TASK_RUNNING);
+			continue;
+		}
+#endif
+
+		schedule();
+	}
+
+	__set_current_state(TASK_RUNNING);
+	rxrpc_see_local(local, rxrpc_local_stop);
+	rxrpc_destroy_local(local);
+	WRITE_ONCE(local->io_thread, NULL);
+	rxrpc_see_local(local, rxrpc_local_stopped);
+	return 0;
+}