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Eric Dumazet reports: Here is a reproducer of an annoying bug detected by syzkaller on our production kernel [..] ./b78305423 enable_conntrack Then : sleep 60 dmesg | tail -10 [ 171.599093] unregister_netdevice: waiting for lo to become free. Usage count = 2 [ 181.631024] unregister_netdevice: waiting for lo to become free. Usage count = 2 [ 191.687076] unregister_netdevice: waiting for lo to become free. Usage count = 2 [ 201.703037] unregister_netdevice: waiting for lo to become free. Usage count = 2 [ 211.711072] unregister_netdevice: waiting for lo to become free. Usage count = 2 [ 221.959070] unregister_netdevice: waiting for lo to become free. Usage count = 2 Reproducer sends ipv6 fragment that hits nfct defrag via LOCAL_OUT hook. skb gets queued until frag timer expiry -- 1 minute. Normally nf_conntrack_reasm gets called during prerouting, so skb has no dst yet which might explain why this wasn't spotted earlier. Reported-by: Eric Dumazet <eric.dumazet@gmail.com> Reported-by: John Sperbeck <jsperbeck@google.com> Signed-off-by: Florian Westphal <fw@strlen.de> Tested-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> |
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| .. | ||
| ip6_tables.c | ||
| ip6t_ah.c | ||
| ip6t_eui64.c | ||
| ip6t_frag.c | ||
| ip6t_hbh.c | ||
| ip6t_ipv6header.c | ||
| ip6t_MASQUERADE.c | ||
| ip6t_mh.c | ||
| ip6t_NPT.c | ||
| ip6t_REJECT.c | ||
| ip6t_rpfilter.c | ||
| ip6t_rt.c | ||
| ip6t_srh.c | ||
| ip6t_SYNPROXY.c | ||
| ip6table_filter.c | ||
| ip6table_mangle.c | ||
| ip6table_nat.c | ||
| ip6table_raw.c | ||
| ip6table_security.c | ||
| Kconfig | ||
| Makefile | ||
| nf_conntrack_l3proto_ipv6.c | ||
| nf_conntrack_proto_icmpv6.c | ||
| nf_conntrack_reasm.c | ||
| nf_defrag_ipv6_hooks.c | ||
| nf_dup_ipv6.c | ||
| nf_flow_table_ipv6.c | ||
| nf_log_ipv6.c | ||
| nf_nat_l3proto_ipv6.c | ||
| nf_nat_masquerade_ipv6.c | ||
| nf_nat_proto_icmpv6.c | ||
| nf_reject_ipv6.c | ||
| nf_socket_ipv6.c | ||
| nf_tproxy_ipv6.c | ||
| nft_chain_nat_ipv6.c | ||
| nft_chain_route_ipv6.c | ||
| nft_dup_ipv6.c | ||
| nft_fib_ipv6.c | ||
| nft_masq_ipv6.c | ||
| nft_redir_ipv6.c | ||
| nft_reject_ipv6.c | ||