bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=27837, q=576 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 874 (4294983097-4294982223), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 875 jiffies! g27837 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:28336 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1568/0x5290 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297 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 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7508 Comm: kworker/u8:16 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker RIP: 0010:timekeeping_adjust kernel/time/timekeeping.c:2200 [inline] RIP: 0010:__timekeeping_advance+0xad7/0x10d0 kernel/time/timekeeping.c:2361 Code: 80 3c 38 00 74 08 4c 89 f7 e8 75 22 7b 00 49 29 1e 4c 8b 64 24 08 48 8b 44 24 70 42 80 3c 38 00 74 08 48 89 ef e8 59 22 7b 00 <4c> 8b 75 00 4d 8d 7e 20 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 RSP: 0018:ffffc90000006b70 EFLAGS: 00000046 RAX: 1ffffffff344d4c2 RBX: dffffc0000000000 RCX: ffff88807b528000 RDX: 0000000000010100 RSI: ffffffff8e7869b0 RDI: 0000000000000000 RBP: ffffffff9a26a610 R08: ffff88807b528000 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000010100 R12: 00000000008ff124 R13: 1ffffffff344d4c5 R14: 00000000007459fa R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881254b0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7446400000 CR3: 0000000061f56000 CR4: 00000000003526f0 Call Trace: timekeeping_advance kernel/time/timekeeping.c:2385 [inline] update_wall_time+0x31/0x200 kernel/time/timekeeping.c:2395 tick_sched_do_timer kernel/time/tick-sched.c:253 [inline] tick_nohz_handler+0xf7/0x770 kernel/time/tick-sched.c:312 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x4d6/0xc30 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3d0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline] RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478 Code: 0f 84 44 ff ff ff e8 52 fb 20 00 fb eb 44 e8 4a fb 20 00 e8 05 03 fb 09 4d 85 f6 74 94 e8 3b fb 20 00 fb 48 c7 c7 c0 04 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 3b 1b RSP: 0018:ffffc90000007120 EFLAGS: 00000246 RAX: ffffffff81a33f95 RBX: ffffffff81a33e0f RCX: ffff88807b528000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffffff8e7504c0 RBP: ffffc900000071d0 R08: ffffffff90109077 R09: 1ffffffff202120e R10: dffffc0000000000 R11: fffffbfff202120f R12: 0000000000000000 R13: 000000000000006f R14: 0000000000000200 R15: 1ffff92000000e28 _printk+0xdd/0x130 kernel/printk/printk.c:2504 br_fdb_update+0x62d/0x690 net/bridge/br_fdb.c:1003 br_handle_frame_finish+0x573/0x1b40 net/bridge/br_input.c:144 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/0x3150 net/core/dev.c:6036 __netif_receive_skb_one_core net/core/dev.c:6147 [inline] __netif_receive_skb net/core/dev.c:6262 [inline] process_backlog+0x76d/0x1950 net/core/dev.c:6614 __napi_poll+0xae/0x340 net/core/dev.c:7678 napi_poll net/core/dev.c:7741 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7893 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 blake2s_compress+0xf9/0x1eb0 lib/crypto/x86/blake2s.h:42 blake2s_update+0x14b/0x450 lib/crypto/blake2s.c:119 hmac+0x1fc/0x3b0 drivers/net/wireguard/noise.c:324 kdf+0xff/0x2b0 drivers/net/wireguard/noise.c:360 mix_dh drivers/net/wireguard/noise.c:413 [inline] wg_noise_handshake_create_initiation+0x2bc/0x830 drivers/net/wireguard/noise.c:550 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:34 [inline] wg_packet_handshake_send_worker+0x18d/0x350 drivers/net/wireguard/send.c:51 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xaec/0x17a0 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 bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) net_ratelimit: 42294 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:22:3e:61:1c:8b:5b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)