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2026-02-13 09:26, Eric Dumazet wrote: > On Fri, Feb 13, 2026 at 1:15 PM syzbot > wrote: >> >> [...] >> ============================================ >> WARNING: possible recursive locking detected >> syzkaller #0 Not tainted >> -------------------------------------------- >> kworker/u8:6/2985 is trying to acquire lock: >> ffff88807a07aa20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline] >> ffff88807a07aa20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: inet6_getname+0x15d/0x650 net/ipv6/af_inet6.c:533 >> >> but task is already holding lock: >> ffff88807a07aa20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline] >> ffff88807a07aa20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_sock_set_cork+0x2c/0x2e0 net/ipv4/tcp.c:3694 >> [...] >> lock_sock_nested+0x48/0x100 net/core/sock.c:3780 >> lock_sock include/net/sock.h:1709 [inline] >> inet6_getname+0x15d/0x650 net/ipv6/af_inet6.c:533 >> rds_tcp_get_peer_sport net/rds/tcp_listen.c:70 [inline] >> rds_tcp_conn_slots_available+0x288/0x470 net/rds/tcp_listen.c:149 >> rds_recv_hs_exthdrs+0x60f/0x7c0 net/rds/recv.c:265 >> rds_recv_incoming+0x9f6/0x12d0 net/rds/recv.c:389 >> rds_tcp_data_recv+0x7f1/0xa40 net/rds/tcp_recv.c:243 >> __tcp_read_sock+0x196/0x970 net/ipv4/tcp.c:1702 >> rds_tcp_read_sock net/rds/tcp_recv.c:277 [inline] >> rds_tcp_data_ready+0x369/0x950 net/rds/tcp_recv.c:331 >> tcp_rcv_established+0x19e9/0x2670 net/ipv4/tcp_input.c:6675 >> tcp_v6_do_rcv+0x8eb/0x1ba0 net/ipv6/tcp_ipv6.c:1609 >> sk_backlog_rcv include/net/sock.h:1185 [inline] >> __release_sock+0x1b8/0x3a0 net/core/sock.c:3213 > [...] > Gerd, please take a look, thanks. > > commit 9d27a0fb122f19b6d01d02f4b4f429ca28811ace > Author: Gerd Rausch > Date: Mon Feb 2 22:57:23 2026 -0700 > > net/rds: Trigger rds_send_ping() more than once Syzbot is right: inet_getname() acquires a lock_sock() that was already held as __release_sock() is about to give it up, but before doing so, handles the backlog receives & callbacks. Just need to figure out a way to obtain the peer's port number, without ending up in such a recursive lock scenario. Thanks for forwarding this, Gerd