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charset="utf-8" [ Upstream commit 871019b22d1bcc9fab2d1feba1b9a564acbb6e99 ] We've started to see the following kernel traces: WARNING: CPU: 83 PID: 0 at net/core/filter.c:6641 sk_lookup+0x1bd/0x1d0 Call Trace: __bpf_skc_lookup+0x10d/0x120 bpf_sk_lookup+0x48/0xd0 bpf_sk_lookup_tcp+0x19/0x20 bpf_prog_+0x37c/0x16a3 cls_bpf_classify+0x205/0x2e0 tcf_classify+0x92/0x160 __netif_receive_skb_core+0xe52/0xf10 __netif_receive_skb_list_core+0x96/0x2b0 napi_complete_done+0x7b5/0xb70 _poll+0x94/0xb0 net_rx_action+0x163/0x1d70 __do_softirq+0xdc/0x32e asm_call_irq_on_stack+0x12/0x20 do_softirq_own_stack+0x36/0x50 do_softirq+0x44/0x70 __inet_hash can race with lockless (rcu) readers on the other cpus: __inet_hash __sk_nulls_add_node_rcu <- (bpf triggers here) sock_set_flag(SOCK_RCU_FREE) Let's move the SOCK_RCU_FREE part up a bit, before we are inserting the socket into hashtables. Note, that the race is really harmless; the bpf callers are handling this situation (where listener socket doesn't have SOCK_RCU_FREE set) correctly, so the only annoyance is a WARN_ONCE. More details from Eric regarding SOCK_RCU_FREE timeline: Commit 3b24d854cb35 ("tcp/dccp: do not touch listener sk_refcnt under synflood") added SOCK_RCU_FREE. At that time, the precise location of sock_set_flag(sk, SOCK_RCU_FREE) did not matter, because the thread calling __inet_hash() owns a reference on sk. SOCK_RCU_FREE was only tested at dismantle time. Commit 6acc9b432e67 ("bpf: Add helper to retrieve socket in BPF") started checking SOCK_RCU_FREE _after_ the lookup to infer whether the refcount has been taken care of. Fixes: 6acc9b432e67 ("bpf: Add helper to retrieve socket in BPF") Reviewed-by: Eric Dumazet Signed-off-by: Stanislav Fomichev Reviewed-by: Kuniyuki Iwashima Signed-off-by: David S. Miller [Resolved conflict for 5.10 and below.] Signed-off-by: Siddh Raman Pant --- net/ipv4/inet_hashtables.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index 56deddeac1b0..0fb5d758264f 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -653,6 +653,7 @@ int __inet_hash(struct sock *sk, struct sock *osk) if (err) goto unlock; } + sock_set_flag(sk, SOCK_RCU_FREE); if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && sk->sk_family =3D=3D AF_INET6) __sk_nulls_add_node_tail_rcu(sk, &ilb->nulls_head); @@ -660,7 +661,6 @@ int __inet_hash(struct sock *sk, struct sock *osk) __sk_nulls_add_node_rcu(sk, &ilb->nulls_head); inet_hash2(hashinfo, sk); ilb->count++; - sock_set_flag(sk, SOCK_RCU_FREE); sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); unlock: spin_unlock(&ilb->lock); --=20 2.45.2 --=-aMY8anj4eTrj68nwtut9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEQ4+7hHLv3y1dvdaRBwq/MEwk8ioFAmbYW1EACgkQBwq/MEwk 8iqFeA/7Bh8QnJYwN7fHFiusA9Hm7wKxgXgU84U6w0GaaYhs8CyS1SG6SRvkng3D 8YF7U9MHV97JDskK/yDEtz8/QmOcrk+VP/crveA8Zo0eAXX8W/vxtszqZLuhvWb0 mj38WMD5GIIa4W1BY7soQGZuzpjE+qVKzdV7hiGpjrImAsrR6V/zmwXRDZUCr0Dp xrNUap3FrrtehfkoEa5MwurLlGHHzUEak7yzWQsS6ScZH3QdLSFru/CKuD2jlqEo njwRR9p4Gdx5SBlv9v4PT/RzmFcaZo0lypDZcgbUFQCLFI5PBv37DVcKI8kjrzu4 UW/Htv6RVAxJsUN+RnuHJWcKmbCugCjx2q4cKlRYZ0/LTb0t6ZJyJhQOIT1Awft/ 74IKGhrH+jBK/fxxSj4Kh7sQ4o29+oWFD+5zxff2j9iNIWHsfwA3OxDj+b7QWcEs qZyxsx/0rcMer6oHi6EX8+byrqpuPfx+Rk0Y/KbzS+Q/9JEkivctEnTTt6S0Ybv0 FVKyOYDE8qYS/YIl8UcbMHzk6Lbp5lrlqDfeHa/9/YTffX+z3oVfgIUkfP44f23o Qrf3eor3yn+vC1RITpmBsS3t4wN+vIcK34v580h1vVLGonSmmVEXRS/IG78etsPx OwucsseqENe80Ar0bRemlbMCyE51T4MQW6DwMWrYnoVL7XkuI9U= =k1bn -----END PGP SIGNATURE----- --=-aMY8anj4eTrj68nwtut9--