On Thu, Oct 22, 2020 at 12:49 AM Greg Rose <gvrose8...@gmail.com> wrote: > > From: Tonghao Zhang <xiangxia.m....@gmail.com> > > Upstream commit: > commit 27de77cec985233bdf6546437b9761853265c505 > Author: Tonghao Zhang <xiangxia.m....@gmail.com> > Date: Fri Apr 17 02:57:31 2020 +0800 > > net: openvswitch: ovs_ct_exit to be done under ovs_lock > > syzbot wrote: > | ============================= > | WARNING: suspicious RCU usage > | 5.7.0-rc1+ #45 Not tainted > | ----------------------------- > | net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader > section!! > | > | other info that might help us debug this: > | rcu_scheduler_active = 2, debug_locks = 1 > | ... > | > | stack backtrace: > | Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org 04/01/2014 > | Workqueue: netns cleanup_net > | Call Trace: > | ... > | ovs_ct_exit > | ovs_exit_net > | ops_exit_list.isra.7 > | cleanup_net > | process_one_work > | worker_thread > > To avoid that warning, invoke the ovs_ct_exit under ovs_lock and add > lockdep_ovsl_is_held as optional lockdep expression. > > Link: https://lore.kernel.org/lkml/000000000000e642a905a0cbe...@google.com > Fixes: 11efd5cb04a1 ("openvswitch: Support conntrack zone limit") > Cc: Pravin B Shelar <pshe...@ovn.org> > Cc: Yi-Hung Wei <yihung....@gmail.com> > Reported-by: syzbot+7ef50afd3a211f879...@syzkaller.appspotmail.com > Signed-off-by: Tonghao Zhang <xiangxia.m....@gmail.com> > Acked-by: Pravin B Shelar <pshe...@ovn.org> > Signed-off-by: David S. Miller <da...@davemloft.net> > > Cc: Tonghao Zhang <xiangxia.m....@gmail.com> > Fixes: cb2a5486a3a3 ("datapath: conntrack: Support conntrack zone limit") > Signed-off-by: Greg Rose <gvrose8...@gmail.com> Acked-by: Tonghao Zhang <xiangxia.m....@gmail.com> Thanks Greg
> --- > datapath/conntrack.c | 3 ++- > datapath/datapath.c | 4 +++- > 2 files changed, 5 insertions(+), 2 deletions(-) > > diff --git a/datapath/conntrack.c b/datapath/conntrack.c > index c7a318baf..50b4d7bd6 100644 > --- a/datapath/conntrack.c > +++ b/datapath/conntrack.c > @@ -1984,7 +1984,8 @@ static void ovs_ct_limit_exit(struct net *net, struct > ovs_net *ovs_net) > struct hlist_head *head = &info->limits[i]; > struct ovs_ct_limit *ct_limit; > > - hlist_for_each_entry_rcu(ct_limit, head, hlist_node) > + hlist_for_each_entry_rcu(ct_limit, head, hlist_node, > + lockdep_ovsl_is_held()) > kfree_rcu(ct_limit, rcu); > } > kfree(ovs_net->ct_limit_info->limits); > diff --git a/datapath/datapath.c b/datapath/datapath.c > index 52a59f135..97ba5fb72 100644 > --- a/datapath/datapath.c > +++ b/datapath/datapath.c > @@ -2576,8 +2576,10 @@ static void __net_exit ovs_exit_net(struct net *dnet) > > ovs_netns_frags6_exit(dnet); > ovs_netns_frags_exit(dnet); > - ovs_ct_exit(dnet); > ovs_lock(); > + > + ovs_ct_exit(dnet); > + > list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) > __dp_destroy(dp); > > -- > 2.17.1 > -- Best regards, Tonghao _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev
