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Message-ID: <682e4c61.a00a0220.2a3337.0006.GAE@google.com>
Date: Wed, 21 May 2025 14:57:53 -0700
From: syzbot <syzbot+b191b5ccad8d7a986286@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: BUG: sleeping function called from invalid context
in team_change_rx_flags
For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org.
***
Subject: Re: BUG: sleeping function called from invalid context in team_change_rx_flags
Author: penguin-kernel@...ove.sakura.ne.jp
#syz test
diff --git a/drivers/net/team/team_core.c b/drivers/net/team/team_core.c
index b75ceb90359f..e4e49f8e566f 100644
--- a/drivers/net/team/team_core.c
+++ b/drivers/net/team/team_core.c
@@ -933,7 +933,7 @@ static bool team_port_find(const struct team *team,
* Enable/disable port by adding to enabled port hashlist and setting
* port->index (Might be racy so reader could see incorrect ifindex when
* processing a flying packet, but that is not a problem). Write guarded
- * by team->lock.
+ * by RTNL.
*/
static void team_port_enable(struct team *team,
struct team_port *port)
@@ -1660,8 +1660,6 @@ static int team_init(struct net_device *dev)
goto err_options_register;
netif_carrier_off(dev);
- lockdep_register_key(&team->team_lock_key);
- __mutex_init(&team->lock, "team->team_lock_key", &team->team_lock_key);
netdev_lockdep_set_classes(dev);
return 0;
@@ -1682,7 +1680,7 @@ static void team_uninit(struct net_device *dev)
struct team_port *port;
struct team_port *tmp;
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
list_for_each_entry_safe(port, tmp, &team->port_list, list)
team_port_del(team, port->dev);
@@ -1691,9 +1689,7 @@ static void team_uninit(struct net_device *dev)
team_mcast_rejoin_fini(team);
team_notify_peers_fini(team);
team_queue_override_fini(team);
- mutex_unlock(&team->lock);
netdev_change_features(dev);
- lockdep_unregister_key(&team->team_lock_key);
}
static void team_destructor(struct net_device *dev)
@@ -1778,7 +1774,7 @@ static void team_change_rx_flags(struct net_device *dev, int change)
struct team_port *port;
int inc;
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
list_for_each_entry(port, &team->port_list, list) {
if (change & IFF_PROMISC) {
inc = dev->flags & IFF_PROMISC ? 1 : -1;
@@ -1789,7 +1785,6 @@ static void team_change_rx_flags(struct net_device *dev, int change)
dev_set_allmulti(port->dev, inc);
}
}
- mutex_unlock(&team->lock);
}
static void team_set_rx_mode(struct net_device *dev)
@@ -1811,14 +1806,13 @@ static int team_set_mac_address(struct net_device *dev, void *p)
struct team *team = netdev_priv(dev);
struct team_port *port;
+ ASSERT_RTNL();
if (dev->type == ARPHRD_ETHER && !is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
dev_addr_set(dev, addr->sa_data);
- mutex_lock(&team->lock);
list_for_each_entry(port, &team->port_list, list)
if (team->ops.port_change_dev_addr)
team->ops.port_change_dev_addr(team, port);
- mutex_unlock(&team->lock);
return 0;
}
@@ -1829,10 +1823,10 @@ static int team_change_mtu(struct net_device *dev, int new_mtu)
int err;
/*
- * Alhough this is reader, it's guarded by team lock. It's not possible
+ * Alhough this is reader, it's guarded by RTNL. It's not possible
* to traverse list in reverse under rcu_read_lock
*/
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
team->port_mtu_change_allowed = true;
list_for_each_entry(port, &team->port_list, list) {
err = dev_set_mtu(port->dev, new_mtu);
@@ -1843,7 +1837,6 @@ static int team_change_mtu(struct net_device *dev, int new_mtu)
}
}
team->port_mtu_change_allowed = false;
- mutex_unlock(&team->lock);
WRITE_ONCE(dev->mtu, new_mtu);
@@ -1853,7 +1846,6 @@ static int team_change_mtu(struct net_device *dev, int new_mtu)
list_for_each_entry_continue_reverse(port, &team->port_list, list)
dev_set_mtu(port->dev, dev->mtu);
team->port_mtu_change_allowed = false;
- mutex_unlock(&team->lock);
return err;
}
@@ -1904,23 +1896,21 @@ static int team_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
int err;
/*
- * Alhough this is reader, it's guarded by team lock. It's not possible
+ * Alhough this is reader, it's guarded by RTNL. It's not possible
* to traverse list in reverse under rcu_read_lock
*/
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
list_for_each_entry(port, &team->port_list, list) {
err = vlan_vid_add(port->dev, proto, vid);
if (err)
goto unwind;
}
- mutex_unlock(&team->lock);
return 0;
unwind:
list_for_each_entry_continue_reverse(port, &team->port_list, list)
vlan_vid_del(port->dev, proto, vid);
- mutex_unlock(&team->lock);
return err;
}
@@ -1930,10 +1920,9 @@ static int team_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
struct team *team = netdev_priv(dev);
struct team_port *port;
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
list_for_each_entry(port, &team->port_list, list)
vlan_vid_del(port->dev, proto, vid);
- mutex_unlock(&team->lock);
return 0;
}
@@ -1955,9 +1944,8 @@ static void team_netpoll_cleanup(struct net_device *dev)
{
struct team *team = netdev_priv(dev);
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
__team_netpoll_cleanup(team);
- mutex_unlock(&team->lock);
}
static int team_netpoll_setup(struct net_device *dev)
@@ -1966,7 +1954,7 @@ static int team_netpoll_setup(struct net_device *dev)
struct team_port *port;
int err = 0;
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
list_for_each_entry(port, &team->port_list, list) {
err = __team_port_enable_netpoll(port);
if (err) {
@@ -1974,7 +1962,6 @@ static int team_netpoll_setup(struct net_device *dev)
break;
}
}
- mutex_unlock(&team->lock);
return err;
}
#endif
@@ -1985,9 +1972,8 @@ static int team_add_slave(struct net_device *dev, struct net_device *port_dev,
struct team *team = netdev_priv(dev);
int err;
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
err = team_port_add(team, port_dev, extack);
- mutex_unlock(&team->lock);
if (!err)
netdev_change_features(dev);
@@ -2000,18 +1986,12 @@ static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
struct team *team = netdev_priv(dev);
int err;
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
err = team_port_del(team, port_dev);
- mutex_unlock(&team->lock);
if (err)
return err;
- if (netif_is_team_master(port_dev)) {
- lockdep_unregister_key(&team->team_lock_key);
- lockdep_register_key(&team->team_lock_key);
- lockdep_set_class(&team->lock, &team->team_lock_key);
- }
netdev_change_features(dev);
return err;
@@ -2308,6 +2288,7 @@ static struct team *team_nl_team_get(struct genl_info *info)
struct net_device *dev;
struct team *team;
+ ASSERT_RTNL();
if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
return NULL;
@@ -2319,13 +2300,12 @@ static struct team *team_nl_team_get(struct genl_info *info)
}
team = netdev_priv(dev);
- mutex_lock(&team->lock);
return team;
}
static void team_nl_team_put(struct team *team)
{
- mutex_unlock(&team->lock);
+ ASSERT_RTNL();
dev_put(team->dev);
}
@@ -2961,11 +2941,8 @@ static void __team_port_change_port_removed(struct team_port *port)
static void team_port_change_check(struct team_port *port, bool linkup)
{
- struct team *team = port->team;
-
- mutex_lock(&team->lock);
+ ASSERT_RTNL();
__team_port_change_check(port, linkup);
- mutex_unlock(&team->lock);
}
diff --git a/drivers/net/team/team_mode_activebackup.c b/drivers/net/team/team_mode_activebackup.c
index e0f599e2a51d..4e133451f4d6 100644
--- a/drivers/net/team/team_mode_activebackup.c
+++ b/drivers/net/team/team_mode_activebackup.c
@@ -68,7 +68,7 @@ static void ab_active_port_get(struct team *team, struct team_gsetter_ctx *ctx)
struct team_port *active_port;
active_port = rcu_dereference_protected(ab_priv(team)->active_port,
- lockdep_is_held(&team->lock));
+ rtnl_is_locked());
if (active_port)
ctx->data.u32_val = active_port->dev->ifindex;
else
diff --git a/drivers/net/team/team_mode_loadbalance.c b/drivers/net/team/team_mode_loadbalance.c
index 00f8989c29c0..6f9944108f5a 100644
--- a/drivers/net/team/team_mode_loadbalance.c
+++ b/drivers/net/team/team_mode_loadbalance.c
@@ -302,7 +302,7 @@ static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
/* Clear old filter data */
__fprog_destroy(lb_priv->ex->orig_fprog);
orig_fp = rcu_dereference_protected(lb_priv->fp,
- lockdep_is_held(&team->lock));
+ rtnl_is_locked());
}
rcu_assign_pointer(lb_priv->fp, fp);
@@ -325,7 +325,7 @@ static void lb_bpf_func_free(struct team *team)
__fprog_destroy(lb_priv->ex->orig_fprog);
fp = rcu_dereference_protected(lb_priv->fp,
- lockdep_is_held(&team->lock));
+ rtnl_is_locked());
bpf_prog_destroy(fp);
}
@@ -336,7 +336,7 @@ static void lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
char *name;
func = rcu_dereference_protected(lb_priv->select_tx_port_func,
- lockdep_is_held(&team->lock));
+ rtnl_is_locked());
name = lb_select_tx_port_get_name(func);
BUG_ON(!name);
ctx->data.str_val = name;
@@ -478,7 +478,8 @@ static void lb_stats_refresh(struct work_struct *work)
team = lb_priv_ex->team;
lb_priv = get_lb_priv(team);
- if (!mutex_trylock(&team->lock)) {
+ /* This rtnl_trylock() might be easy to compete... */
+ if (!rtnl_trylock()) {
schedule_delayed_work(&lb_priv_ex->stats.refresh_dw, 0);
return;
}
@@ -515,7 +516,7 @@ static void lb_stats_refresh(struct work_struct *work)
schedule_delayed_work(&lb_priv_ex->stats.refresh_dw,
(lb_priv_ex->stats.refresh_interval * HZ) / 10);
- mutex_unlock(&team->lock);
+ rtnl_unlock();
}
static void lb_stats_refresh_interval_get(struct team *team,
diff --git a/include/linux/if_team.h b/include/linux/if_team.h
index cdc684e04a2f..ce97d891cf72 100644
--- a/include/linux/if_team.h
+++ b/include/linux/if_team.h
@@ -191,8 +191,6 @@ struct team {
const struct header_ops *header_ops_cache;
- struct mutex lock; /* used for overall locking, e.g. port lists write */
-
/*
* List of enabled ports and their count
*/
@@ -223,7 +221,6 @@ struct team {
atomic_t count_pending;
struct delayed_work dw;
} mcast_rejoin;
- struct lock_class_key team_lock_key;
long mode_priv[TEAM_MODE_PRIV_LONGS];
};
--
2.43.5
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