nf_conntrack_cleanup_net_list() calls schedule() so it does not show up as a hung task. Add an explicit check to make debugging leaked skbs/conntack references more obvious. Signed-off-by: Jakub Kicinski --- net/netfilter/nf_conntrack_core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 0b95f226f211..d1f8eb725d42 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -2487,6 +2487,7 @@ void nf_conntrack_cleanup_net(struct net *net) void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) { struct nf_ct_iter_data iter_data = {}; + unsigned long start = jiffies; struct net *net; int busy; @@ -2507,6 +2508,8 @@ void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) busy = 1; } if (busy) { + DEBUG_NET_WARN_ONCE(time_after(jiffies, start + 60 * HZ), + "conntrack cleanup blocked for 60s"); schedule(); goto i_see_dead_people; } -- 2.52.0