rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P20416/1:b..l
rcu: 	(detected by 0, t=10588 jiffies, g=110489, q=1217 ncpus=2)
task:syz.3.3962      state:R  running task     stack:28376 pid:20416 tgid:20414 ppid:17283  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17d4/0x5820 kernel/sched/core.c:7270
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x19c5/0x2550 arch/x86/kernel/unwind_orc.c:-1
Code: 0f b6 04 20 84 c0 0f 85 c5 0a 00 00 48 0f bf 03 49 01 c0 49 8d 56 40 4c 89 f7 4c 89 c6 e8 33 0e 00 00 84 c0 0f 84 4e 01 00 00 <48> bb 00 00 00 00 00 fc ff df 48 8b 44 24 10 0f b6 04 18 84 c0 0f
RSP: 0018:ffffc9001468f9c0 EFLAGS: 00000202
RAX: 1ffff920028d1f01 RBX: ffffffff919b5fec RCX: 0000000000000001
RDX: ffffc9001468faa8 RSI: dffffc0000000000 RDI: ffffc9001468fd10
RBP: 1ffffffff2336bfd R08: ffffc9001468fd10 R09: 0000000000000000
R10: ffffc9001468fab8 R11: fffff520028d1f59 R12: dffffc0000000000
R13: ffffffff919b5fed R14: ffffc9001468fa68 R15: ffffc9001468fab0
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 ref_tracker_alloc+0x1b0/0x4b0 lib/ref_tracker.c:276
 __netns_tracker_alloc include/net/net_namespace.h:370 [inline]
 netns_tracker_alloc include/net/net_namespace.h:379 [inline]
 get_net_track+0x16e/0x230 include/net/net_namespace.h:396
 sk_alloc+0x1da/0x390 net/core/sock.c:2324
 __netlink_create+0x62/0x260 net/netlink/af_netlink.c:627
 netlink_create+0x3ca/0x590 net/netlink/af_netlink.c:685
 __sock_create+0x4b3/0x9d0 net/socket.c:1676
 sock_create net/socket.c:1734 [inline]
 __sys_socket_create net/socket.c:1771 [inline]
 __sys_socket+0xd6/0x1b0 net/socket.c:1818
 __do_sys_socket net/socket.c:1832 [inline]
 __se_sys_socket net/socket.c:1830 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1830
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f072b99e159
RSP: 002b:00007f0729bd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f072bc26090 RCX: 00007f072b99e159
RDX: 0000000000000010 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007f072ba35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f072bc26128 R14: 00007f072bc26090 R15: 00007ffe5b827c28
 </TASK>
rcu: rcu_preempt kthread starved for 416 jiffies! g110489 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17d4/0x5820 kernel/sched/core.c:7270
 __schedule_loop kernel/sched/core.c:7347 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7362
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9787 Comm: kworker/u8:31 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
RIP: 0010:ebt_do_table+0x25ea/0x27d0 net/bridge/netfilter/ebtables.c:-1
Code: 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 22 ff ff ff 4c 89 e7 e8 68 bc 79 f7 49 89 dc e9 12 ff ff ff 83 fb ff 75 0c e8 96 f4 09 f7 <bb> 01 00 00 00 eb 07 e8 8a f4 09 f7 31 db 48 8b bc 24 e0 00 00 00
RSP: 0018:ffffc90000a17c40 EFLAGS: 00000246
RAX: ffffffff8abdbf0a RBX: 00000000ffffffff RCX: ffff88803630ddc0
RDX: 8000000000000300 RSI: 0000000000000100 RDI: 00000000ffffffff
RBP: ffffc90000a17e20 R08: ffff88803630ddc0 R09: 0000000000000002
R10: 00000000ffffffff R11: 8000000000000300 R12: ffffc90004dd9090
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124de0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555570d8aa38 CR3: 000000007f554000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:280 [inline]
 NF_HOOK+0x23e/0x3f0 include/linux/netfilter.h:323
 br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66
 br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1165 [inline]
 br_nf_forward_finish+0xa76/0xea0 net/bridge/br_netfilter_hooks.c:667
 NF_HOOK+0x64e/0x6e0 include/linux/netfilter.h:325
 br_nf_forward_ip+0x7eb/0xa30 net/bridge/br_netfilter_hooks.c:721
 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:280 [inline]
 NF_HOOK+0x23e/0x3f0 include/linux/netfilter.h:323
 __br_forward+0x397/0x540 net/bridge/br_forward.c:115
 br_handle_frame_finish+0x1119/0x1950 net/bridge/br_input.c:229
 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
 br_nf_pre_routing_finish_ipv6+0x90c/0xc40 net/bridge/br_netfilter_ipv6.c:-1
 NF_HOOK include/linux/netfilter.h:325 [inline]
 br_nf_pre_routing_ipv6+0x382/0x6f0 net/bridge/br_netfilter_ipv6.c:183
 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
 br_handle_frame+0x127f/0x1510 net/bridge/br_input.c:442
 __netif_receive_skb_core+0x989/0x30c0 net/core/dev.c:6151
 __netif_receive_skb_one_core net/core/dev.c:6262 [inline]
 __netif_receive_skb net/core/dev.c:6377 [inline]
 process_backlog+0x727/0x18b0 net/core/dev.c:6728
 __napi_poll+0xaa/0x330 net/core/dev.c:7787
 napi_poll net/core/dev.c:7850 [inline]
 net_rx_action+0x61d/0xf50 net/core/dev.c:8007
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 do_softirq+0x77/0xd0 kernel/softirq.c:546
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
 blake2s_compress+0xfa/0x1c00 lib/crypto/x86/blake2s.h:42
 blake2s_final+0x10f/0x270 lib/crypto/blake2s.c:142
 hmac+0x204/0x3b0 drivers/net/wireguard/noise.c:325
 kdf+0x12d/0x290 drivers/net/wireguard/noise.c:367
 mix_dh drivers/net/wireguard/noise.c:413 [inline]
 wg_noise_handshake_create_initiation+0x29e/0x810 drivers/net/wireguard/noise.c:550
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:34 [inline]
 wg_packet_handshake_send_worker+0x18c/0x370 drivers/net/wireguard/send.c:51
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
net_ratelimit: 12650 callbacks suppressed
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)