============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
kworker/u8:5/105 is trying to acquire lock:
ffff88807d802a20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
ffff88807d802a20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: inet6_getname+0x15d/0x650 net/ipv6/af_inet6.c:533

but task is already holding lock:
ffff88807d802a20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
ffff88807d802a20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: rds_tcp_recv_path+0xfe/0x340 net/rds/tcp_recv.c:304

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(k-sk_lock-AF_INET6);
  lock(k-sk_lock-AF_INET6);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by kworker/u8:5/105:
 #0: ffff88805bb33148 ((wq_completion)krds_cp_wq#3/0){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3250 [inline]
 #0: ffff88805bb33148 ((wq_completion)krds_cp_wq#3/0){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830 kernel/workqueue.c:3358
 #1: ffffc900026d7c40 ((work_completion)(&cp->cp_down_w)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3251 [inline]
 #1: ffffc900026d7c40 ((work_completion)(&cp->cp_down_w)){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830 kernel/workqueue.c:3358
 #2: ffff88807d802a20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
 #2: ffff88807d802a20 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: rds_tcp_recv_path+0xfe/0x340 net/rds/tcp_recv.c:304

stack backtrace:
CPU: 0 UID: 0 PID: 105 Comm: kworker/u8:5 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: krds_cp_wq#3/0 rds_shutdown_worker
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x253f/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 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_recv_path+0x200/0x340 net/rds/tcp_recv.c:305
 rds_tcp_conn_path_shutdown+0x295/0xac0 net/rds/tcp_connect.c:269
 rds_conn_shutdown+0x4b8/0xab0 net/rds/connection.c:414
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>