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netfilter: conntrack: warn when cleanup is stuck

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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.

Acked-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251207010942.1672972-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2025-12-06 17:09:42 -08:00
parent 006a5035b4
commit 92df4c56cf
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nf_conntrack_core.c
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@ -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 @@ i_see_dead_people:
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;
}