syzbot

================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
kworker/u8:7/3518 [HC0[0]:SC1[3]:HE1:SE0] takes:
ffff888067bb51e0 (k-sk_lock-AF_INET6){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
ffff888067bb51e0 (k-sk_lock-AF_INET6){+.?.}-{0:0}, at: inet6_getname+0x15d/0x650 net/ipv6/af_inet6.c:533
{SOFTIRQ-ON-W} state was registered at:
  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]
  tcp_sock_set_nodelay+0x2a/0x180 net/ipv4/tcp.c:3718
  rds_tcp_listen_init+0x168/0x410 net/rds/tcp_listen.c:404
  rds_tcp_init_net+0x154/0x380 net/rds/tcp.c:568
  ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
  __register_pernet_operations net/core/net_namespace.c:1312 [inline]
  register_pernet_operations+0x343/0x830 net/core/net_namespace.c:1389
  register_pernet_device+0x2a/0x80 net/core/net_namespace.c:1476
  rds_tcp_init+0xcf/0x170 net/rds/tcp.c:749
  do_one_initcall+0x250/0x8d0 init/main.c:1382
  do_initcall_level+0x104/0x190 init/main.c:1444
  do_initcalls+0x59/0xa0 init/main.c:1460
  kernel_init_freeable+0x2a6/0x3e0 init/main.c:1692
  kernel_init+0x1d/0x1d0 init/main.c:1582
  ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
irq event stamp: 54204
hardirqs last  enabled at (54204): [<ffffffff8bbb5050>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last  enabled at (54204): [<ffffffff8bbb5050>] _raw_spin_unlock_irqrestore+0x30/0x80 kernel/locking/spinlock.c:194
hardirqs last disabled at (54203): [<ffffffff8bbb4eaa>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (54203): [<ffffffff8bbb4eaa>] _raw_spin_lock_irqsave+0x1a/0x60 kernel/locking/spinlock.c:162
softirqs last  enabled at (54114): [<ffffffff89867564>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last  enabled at (54114): [<ffffffff89867564>] rcu_read_lock_bh include/linux/rcupdate.h:903 [inline]
softirqs last  enabled at (54114): [<ffffffff89867564>] __dev_queue_xmit+0x274/0x38a0 net/core/dev.c:4757
softirqs last disabled at (54115): [<ffffffff81885336>] do_softirq+0x76/0xd0 kernel/softirq.c:523

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

       CPU0
       ----
  lock(k-sk_lock-AF_INET6);
  <Interrupt>
    lock(k-sk_lock-AF_INET6);

 *** DEADLOCK ***

12 locks held by kworker/u8:7/3518:
 #0: ffff888067b9b148 ((wq_completion)krds_cp_wq#0/0){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
 #1: ffffc9000bf7fc40 ((work_completion)(&(&cp->cp_send_w)->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
 #2: ffff888067bb5f20 (k-sk_lock-AF_INET6){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
 #2: ffff888067bb5f20 (k-sk_lock-AF_INET6){+.?.}-{0:0}, at: tcp_sock_set_cork+0x2c/0x2e0 net/ipv4/tcp.c:3694
 #3: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #3: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #3: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: inet6_csk_xmit+0x1ee/0x750 net/ipv6/inet6_connection_sock.c:108
 #4: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #4: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #4: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: ip6_xmit+0x2a1/0x1ac0 net/ipv6/ip6_output.c:287
 #5: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #5: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #5: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: ip6_output+0x126/0x550 net/ipv6/ip6_output.c:235
 #6: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: local_lock_acquire include/linux/local_lock_internal.h:46 [inline]
 #6: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: process_backlog+0x3eb/0x1950 net/core/dev.c:6613
 #7: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #7: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #7: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb_internal net/core/dev.c:6338 [inline]
 #7: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb+0x102/0xc50 net/core/dev.c:6410
 #8: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #8: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #8: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: nf_hook include/linux/netfilter.h:242 [inline]
 #8: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: NF_HOOK+0x9e/0x3c0 include/linux/netfilter.h:316
 #9: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #9: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #9: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: ip6_input+0x23/0x270 net/ipv6/ip6_input.c:499
 #10: ffff888067bb5160 (k-slock-AF_INET6/1){+.-.}-{3:3}, at: tcp_v6_rcv+0x269b/0x3110 net/ipv6/tcp_ipv6.c:1875
 #11: ffff888067bb5388 (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: 3518 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: krds_cp_wq#0/0 rds_send_worker
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_usage_bug+0x28b/0x2e0 kernel/locking/lockdep.c:4042
 valid_state kernel/locking/lockdep.c:4056 [inline]
 mark_lock_irq+0x410/0x420 kernel/locking/lockdep.c:-1
 mark_lock+0x115/0x190 kernel/locking/lockdep.c:4753
 mark_usage kernel/locking/lockdep.c:-1 [inline]
 __lock_acquire+0x689/0x2cf0 kernel/locking/lockdep.c:5191
 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_rcv_established+0x19f4/0x2740 net/ipv4/tcp_input.c:6675
 tcp_v6_do_rcv+0x8eb/0x1ba0 net/ipv6/tcp_ipv6.c:1609
 tcp_v6_rcv+0x2811/0x3110 net/ipv6/tcp_ipv6.c:1879
 ip6_protocol_deliver_rcu+0xa73/0x1600 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x191/0x370 net/ipv6/ip6_input.c:489
 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:500
 ip_sabotage_in+0x1e1/0x270 net/bridge/br_netfilter_hooks.c:990
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
 nf_hook include/linux/netfilter.h:273 [inline]
 NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316
 __netif_receive_skb_one_core net/core/dev.c:6152 [inline]
 __netif_receive_skb net/core/dev.c:6265 [inline]
 netif_receive_skb_internal net/core/dev.c:6351 [inline]
 netif_receive_skb+0x278/0xc50 net/core/dev.c:6410
 NF_HOOK+0xa4/0x3a0 include/linux/netfilter.h:319
 br_handle_frame_finish+0x14b2/0x1b40 net/bridge/br_input.c:-1
 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
 br_nf_pre_routing_finish_ipv6+0xa3a/0xd70 net/bridge/br_netfilter_ipv6.c:-1
 NF_HOOK include/linux/netfilter.h:318 [inline]
 br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:184
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
 br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442
 __netif_receive_skb_core+0x98f/0x31a0 net/core/dev.c:6039
 __netif_receive_skb_one_core net/core/dev.c:6150 [inline]
 __netif_receive_skb net/core/dev.c:6265 [inline]
 process_backlog+0x76d/0x1950 net/core/dev.c:6617
 __napi_poll+0xae/0x340 net/core/dev.c:7681
 napi_poll net/core/dev.c:7744 [inline]
 net_rx_action+0x627/0xf70 net/core/dev.c:7896
 handle_softirqs+0x22a/0x870 kernel/softirq.c:626
 do_softirq+0x76/0xd0 kernel/softirq.c:523
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline]
 __dev_queue_xmit+0x1e6c/0x38a0 net/core/dev.c:4859
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip6_xmit+0x10f9/0x1ac0 net/ipv6/ip6_output.c:372
 inet6_csk_xmit+0x4a5/0x750 net/ipv6/inet6_connection_sock.c:114
 __tcp_transmit_skb+0x249b/0x43e0 net/ipv4/tcp_output.c:1693
 tcp_transmit_skb net/ipv4/tcp_output.c:1711 [inline]
 tcp_write_xmit+0x16e8/0x6980 net/ipv4/tcp_output.c:3064
 __tcp_push_pending_frames+0x97/0x380 net/ipv4/tcp_output.c:3247
 tcp_push_pending_frames include/net/tcp.h:2276 [inline]
 __tcp_sock_set_cork net/ipv4/tcp.c:3688 [inline]
 tcp_sock_set_cork+0x186/0x2e0 net/ipv4/tcp.c:3695
 rds_send_xmit+0x207e/0x28d0 net/rds/send.c:480
 rds_send_worker+0x7d/0x2e0 net/rds/threads.c:200
 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: 3518, name: kworker/u8:7
preempt_count: 303, expected: 0
RCU nest depth: 7, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<ffffffff89867571>] local_bh_disable include/linux/bottom_half.h:20 [inline]
[<ffffffff89867571>] rcu_read_lock_bh include/linux/rcupdate.h:903 [inline]
[<ffffffff89867571>] __dev_queue_xmit+0x281/0x38a0 net/core/dev.c:4757
CPU: 0 UID: 0 PID: 3518 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: krds_cp_wq#0/0 rds_send_worker
Call Trace:
 <IRQ>
 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_rcv_established+0x19f4/0x2740 net/ipv4/tcp_input.c:6675
 tcp_v6_do_rcv+0x8eb/0x1ba0 net/ipv6/tcp_ipv6.c:1609
 tcp_v6_rcv+0x2811/0x3110 net/ipv6/tcp_ipv6.c:1879
 ip6_protocol_deliver_rcu+0xa73/0x1600 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x191/0x370 net/ipv6/ip6_input.c:489
 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:500
 ip_sabotage_in+0x1e1/0x270 net/bridge/br_netfilter_hooks.c:990
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
 nf_hook include/linux/netfilter.h:273 [inline]
 NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316
 __netif_receive_skb_one_core net/core/dev.c:6152 [inline]
 __netif_receive_skb net/core/dev.c:6265 [inline]
 netif_receive_skb_internal net/core/dev.c:6351 [inline]
 netif_receive_skb+0x278/0xc50 net/core/dev.c:6410
 NF_HOOK+0xa4/0x3a0 include/linux/netfilter.h:319
 br_handle_frame_finish+0x14b2/0x1b40 net/bridge/br_input.c:-1
 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
 br_nf_pre_routing_finish_ipv6+0xa3a/0xd70 net/bridge/br_netfilter_ipv6.c:-1
 NF_HOOK include/linux/netfilter.h:318 [inline]
 br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:184
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
 br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442
 __netif_receive_skb_core+0x98f/0x31a0 net/core/dev.c:6039
 __netif_receive_skb_one_core net/core/dev.c:6150 [inline]
 __netif_receive_skb net/core/dev.c:6265 [inline]
 process_backlog+0x76d/0x1950 net/core/dev.c:6617
 __napi_poll+0xae/0x340 net/core/dev.c:7681
 napi_poll net/core/dev.c:7744 [inline]
 net_rx_action+0x627/0xf70 net/core/dev.c:7896
 handle_softirqs+0x22a/0x870 kernel/softirq.c:626
 do_softirq+0x76/0xd0 kernel/softirq.c:523
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline]
 __dev_queue_xmit+0x1e6c/0x38a0 net/core/dev.c:4859
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip6_xmit+0x10f9/0x1ac0 net/ipv6/ip6_output.c:372
 inet6_csk_xmit+0x4a5/0x750 net/ipv6/inet6_connection_sock.c:114
 __tcp_transmit_skb+0x249b/0x43e0 net/ipv4/tcp_output.c:1693
 tcp_transmit_skb net/ipv4/tcp_output.c:1711 [inline]
 tcp_write_xmit+0x16e8/0x6980 net/ipv4/tcp_output.c:3064
 __tcp_push_pending_frames+0x97/0x380 net/ipv4/tcp_output.c:3247
 tcp_push_pending_frames include/net/tcp.h:2276 [inline]
 __tcp_sock_set_cork net/ipv4/tcp.c:3688 [inline]
 tcp_sock_set_cork+0x186/0x2e0 net/ipv4/tcp.c:3695
 rds_send_xmit+0x207e/0x28d0 net/rds/send.c:480
 rds_send_worker+0x7d/0x2e0 net/rds/threads.c:200
 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>