diff options
| author | Nikolay Aleksandrov <nikolay@redhat.com> | 2013-08-01 11:51:42 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-08-01 15:52:49 -0700 |
| commit | 4beac0293fabb68125e1a9d2ce81d89343f8702d (patch) | |
| tree | 9ebf458d36610e004303d36cd83ae5992354594e | |
| parent | 9ab5ec59c8a9cc0e4b94252b48200b6023c716aa (diff) | |
bonding: fix system hang due to fast igmp timer rescheduling
After commit 4aa5dee4d9 ("net: convert resend IGMP to notifier event")
we try to acquire rtnl in bond_resend_igmp_join_requests but it can be
scheduled with rtnl already held (e.g. when bond_change_active_slave is
called with rtnl) causing a loop of immediate reschedules + calls because
rtnl_trylock fails each time since it's being already held.
For me this issue leads to system hangs very easy:
modprobe bonding; ifconfig bond0 up; ifenslave bond0 eth0; rmmod
bonding;
The fix is to introduce a small (1 jiffy) delay which is enough for the
sections holding rtnl to finish without putting any strain on the system.
Also adjust the timer in bond_change_active_slave to be 1 jiffy, since
most of the time it's called with rtnl already held.
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index da3af631f21..bc3578e4980 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -723,7 +723,7 @@ static int bond_set_allmulti(struct bonding *bond, int inc) static void bond_resend_igmp_join_requests(struct bonding *bond) { if (!rtnl_trylock()) { - queue_delayed_work(bond->wq, &bond->mcast_work, 0); + queue_delayed_work(bond->wq, &bond->mcast_work, 1); return; } call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); @@ -1084,7 +1084,7 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active) ((USES_PRIMARY(bond->params.mode) && new_active) || bond->params.mode == BOND_MODE_ROUNDROBIN)) { bond->igmp_retrans = bond->params.resend_igmp; - queue_delayed_work(bond->wq, &bond->mcast_work, 0); + queue_delayed_work(bond->wq, &bond->mcast_work, 1); } } |