============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
kworker/u8:8/8880 is trying to acquire lock:
ffff8880a6213760 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
ffff8880a6213760 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: inet6_getname+0x15d/0x650 net/ipv6/af_inet6.c:533

but task is already holding lock:
ffff8880a6213760 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
ffff8880a6213760 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: inet_shutdown+0x6a/0x390 net/ipv4/af_inet.c:913

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

4 locks held by kworker/u8:8/8880:
 #0: ffff888028164948 ((wq_completion)krds_cp_wq#8/0){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
 #1: ffffc9000c9e7c40 ((work_completion)(&cp->cp_down_w)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
 #2: ffff8880a6213760 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
 #2: ffff8880a6213760 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: inet_shutdown+0x6a/0x390 net/ipv4/af_inet.c:913
 #3: ffff8880a6213908 (k-clock-AF_INET6){++.-}-{3:3}, at: rds_tcp_data_ready+0x113/0x9a0 net/rds/tcp_recv.c:320

stack backtrace:
CPU: 0 UID: 0 PID: 8880 Comm: kworker/u8:8 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: krds_cp_wq#8/0 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_data_ready+0x369/0x9a0 net/rds/tcp_recv.c:331
 tcp_data_queue+0x1e2e/0x5e50 net/ipv4/tcp_input.c:5719
 tcp_rcv_state_process+0x24a0/0x4810 net/ipv4/tcp_input.c:7421
 tcp_v6_do_rcv+0xbef/0x1ba0 net/ipv6/tcp_ipv6.c:1632
 sk_backlog_rcv include/net/sock.h:1185 [inline]
 __release_sock+0x1b8/0x3a0 net/core/sock.c:3213
 release_sock+0x5f/0x1f0 net/core/sock.c:3795
 inet_shutdown+0x2b1/0x390 net/ipv4/af_inet.c:950
 rds_tcp_conn_path_shutdown+0x252/0xac0 net/rds/tcp_connect.c:248
 rds_conn_shutdown+0x4b8/0xab0 net/rds/connection.c:414
 process_one_work+0x949/0x1650 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
 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>
BUG: sleeping function called from invalid context at net/core/sock.c:3782
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 8880, name: kworker/u8:8
preempt_count: 201, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 UID: 0 PID: 8880 Comm: kworker/u8:8 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: krds_cp_wq#8/0 rds_shutdown_worker
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 __might_resched+0x378/0x4d0 kernel/sched/core.c:8884
 lock_sock_nested+0x5d/0x100 net/core/sock.c:3782
 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+0x369/0x9a0 net/rds/tcp_recv.c:331
 tcp_data_queue+0x1e2e/0x5e50 net/ipv4/tcp_input.c:5719
 tcp_rcv_state_process+0x24a0/0x4810 net/ipv4/tcp_input.c:7421
 tcp_v6_do_rcv+0xbef/0x1ba0 net/ipv6/tcp_ipv6.c:1632
 sk_backlog_rcv include/net/sock.h:1185 [inline]
 __release_sock+0x1b8/0x3a0 net/core/sock.c:3213
 release_sock+0x5f/0x1f0 net/core/sock.c:3795
 inet_shutdown+0x2b1/0x390 net/ipv4/af_inet.c:950
 rds_tcp_conn_path_shutdown+0x252/0xac0 net/rds/tcp_connect.c:248
 rds_conn_shutdown+0x4b8/0xab0 net/rds/connection.c:414
 process_one_work+0x949/0x1650 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
 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>
BUG: scheduling while atomic: kworker/u8:8/8880/0x00000202
INFO: lockdep is turned off.
Modules linked in:
Preemption disabled at:
[<0000000000000000>] 0x0