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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Nithin Nayak Sujir <nsujir@tintri.com>,
        Mahesh Bandewar <maheshb@google.com>,
        Jay Vosburgh <jay.vosburgh@canonical.com>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.9 112/310] bonding: Dont update slave->link until ready to commit
Date:   Wed, 11 Apr 2018 20:34:11 +0200
Message-Id: <20180411183627.007204341@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nithin Sujir <nsujir@tintri.com>


[ Upstream commit 797a93647a48d6cb8a20641a86a71713a947f786 ]

In the loadbalance arp monitoring scheme, when a slave link change is
detected, the slave->link is immediately updated and slave_state_changed
is set. Later down the function, the rtnl_lock is acquired and the
changes are committed, updating the bond link state.

However, the acquisition of the rtnl_lock can fail. The next time the
monitor runs, since slave->link is already updated, it determines that
link is unchanged. This results in the bond link state permanently out
of sync with the slave link.

This patch modifies bond_loadbalance_arp_mon() to handle link changes
identical to bond_ab_arp_{inspect/commit}(). The new link state is
maintained in slave->new_link until we're ready to commit at which point
it's copied into slave->link.

NOTE: miimon_{inspect/commit}() has a more complex state machine
requiring the use of the bond_{propose,commit}_link_state() functions
which maintains the intermediate state in slave->link_new_state. The arp
monitors don't require that.

Testing: This bug is very easy to reproduce with the following steps.
1. In a loop, toggle a slave link of a bond slave interface.
2. In a separate loop, do ifconfig up/down of an unrelated interface to
create contention for rtnl_lock.
Within a few iterations, the bond link goes out of sync with the slave
link.

Signed-off-by: Nithin Nayak Sujir <nsujir@tintri.com>
Cc: Mahesh Bandewar <maheshb@google.com>
Cc: Jay Vosburgh <jay.vosburgh@canonical.com>
Acked-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/bonding/bond_main.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2605,11 +2605,13 @@ static void bond_loadbalance_arp_mon(str
 	bond_for_each_slave_rcu(bond, slave, iter) {
 		unsigned long trans_start = dev_trans_start(slave->dev);
 
+		slave->new_link = BOND_LINK_NOCHANGE;
+
 		if (slave->link != BOND_LINK_UP) {
 			if (bond_time_in_interval(bond, trans_start, 1) &&
 			    bond_time_in_interval(bond, slave->last_rx, 1)) {
 
-				slave->link  = BOND_LINK_UP;
+				slave->new_link = BOND_LINK_UP;
 				slave_state_changed = 1;
 
 				/* primary_slave has no meaning in round-robin
@@ -2636,7 +2638,7 @@ static void bond_loadbalance_arp_mon(str
 			if (!bond_time_in_interval(bond, trans_start, 2) ||
 			    !bond_time_in_interval(bond, slave->last_rx, 2)) {
 
-				slave->link  = BOND_LINK_DOWN;
+				slave->new_link = BOND_LINK_DOWN;
 				slave_state_changed = 1;
 
 				if (slave->link_failure_count < UINT_MAX)
@@ -2667,6 +2669,11 @@ static void bond_loadbalance_arp_mon(str
 		if (!rtnl_trylock())
 			goto re_arm;
 
+		bond_for_each_slave(bond, slave, iter) {
+			if (slave->new_link != BOND_LINK_NOCHANGE)
+				slave->link = slave->new_link;
+		}
+
 		if (slave_state_changed) {
 			bond_slave_state_change(bond);
 			if (BOND_MODE(bond) == BOND_MODE_XOR)