bridge0: received packet on veth0_to_bridge with own address as source address (addr:4a:99:cc:9e:c3:79, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P21286/1:b..l rcu: (detected by 0, t=10502 jiffies, g=251541, q=1340 ncpus=1) task:getty state:R running task stack:24664 pid:21286 tgid:21286 ppid:1 task_flags:0x40010c flags:0x00080001 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0xfee/0x6120 kernel/sched/core.c:6908 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7235 irqentry_exit+0x17b/0x670 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__update_page_owner_free_handle.isra.0+0x1af/0x4d0 mm/page_owner.c:289 Code: 0c 31 ff 44 89 ee 49 01 df e8 5d 45 89 ff 45 85 ed 74 49 e8 a3 4a 89 ff be 08 00 00 00 48 89 df e8 16 dc f4 ff 48 0f ba 33 01 <48> b8 00 00 00 00 00 fc ff df 49 8d 7f 0c 48 89 fa 48 c1 ea 03 0f RSP: 0018:ffffc90003b47a48 EFLAGS: 00000247 RAX: 0000000000000001 RBX: ffff88802007db40 RCX: ffffffff827ecc8a RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88802007db40 RBP: 0000000000000004 R08: 0000000000000001 R09: ffffed100400fb68 R10: ffff88802007db47 R11: 0000000000000000 R12: ffff888020f3bd00 R13: 0000000006e204cb R14: 0000000000000008 R15: ffff88802007db48 __reset_page_owner+0x93/0x190 mm/page_owner.c:321 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0x7e1/0x10d0 mm/page_alloc.c:2978 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xe0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] __kmalloc_cache_noprof+0x243/0x6f0 mm/slub.c:5375 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] serport_ldisc_open+0x66/0x190 drivers/input/serio/serport.c:81 tty_ldisc_open+0xa2/0x120 drivers/tty/tty_ldisc.c:432 tty_ldisc_reinit+0x214/0x360 drivers/tty/tty_ldisc.c:667 tty_ldisc_hangup+0x34e/0x6e0 drivers/tty/tty_ldisc.c:725 __tty_hangup.part.0+0x3e4/0x7f0 drivers/tty/tty_io.c:621 __tty_hangup drivers/tty/tty_io.c:576 [inline] tty_vhangup_session+0x24/0x30 drivers/tty/tty_io.c:725 disassociate_ctty+0x3e4/0x620 drivers/tty/tty_jobctrl.c:275 do_exit+0x17ee/0x2b60 kernel/exit.c:974 do_group_exit+0xd5/0x2a0 kernel/exit.c:1118 __do_sys_exit_group kernel/exit.c:1129 [inline] __se_sys_exit_group kernel/exit.c:1127 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1127 x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f946af0c6c5 RSP: 002b:00007ffe20a12868 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f946b00dfe8 RCX: 00007f946af0c6c5 RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001 RBP: 0000000000000001 R08: 00007ffe20a127f8 R09: 0000000000000000 R10: 00007ffe20a12690 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f946b00c680 R15: 00007f946b00e000 rcu: rcu_preempt kthread starved for 1090 jiffies! g251541 f0x0 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:27832 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0xfee/0x6120 kernel/sched/core.c:6908 __schedule_loop kernel/sched/core.c:6990 [inline] schedule+0xdd/0x390 kernel/sched/core.c:7005 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x754/0xd80 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: CPU: 0 UID: 0 PID: 15524 Comm: kworker/u11:57 Tainted: G U L syzkaller #0 PREEMPT(full) Tainted: [U]=USER, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker RIP: 0010:slab_free_hook mm/slub.c:2616 [inline] RIP: 0010:slab_free mm/slub.c:6165 [inline] RIP: 0010:kmem_cache_free+0x3c8/0x6a0 mm/slub.c:6295 Code: ff e8 8c 10 85 ff 84 c0 0f 85 d9 fc ff ff 48 8d 3d cd 12 77 0e 67 48 0f b9 3a e9 c8 fc ff ff 8b 75 1c 4c 89 e7 e8 18 b5 94 02 f2 fc ff ff bf 01 00 00 00 e8 69 27 6d ff 65 44 8b 15 31 b7 a5 RSP: 0018:ffffc90000006c40 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffea000191c0c0 RCX: 0000000000000000 RDX: 0000000000000102 RSI: ffff888064704000 RDI: 0000000000000001 RBP: ffff88801fea73c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888064703700 R13: 0000000000a12110 R14: ffffffff89566c62 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88812434a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005560d2d77088 CR3: 000000007e480000 CR4: 00000000003526f0 Call Trace: __skb_ext_put+0x102/0x2f0 net/core/skbuff.c:7252 __skb_ext_del+0xf8/0x380 net/core/skbuff.c:7219 skb_ext_del include/linux/skbuff.h:5073 [inline] nf_bridge_info_free net/bridge/br_netfilter_hooks.c:156 [inline] br_nf_dev_queue_xmit+0x7ab/0x2a20 net/bridge/br_netfilter_hooks.c:919 NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] br_nf_post_routing+0xcbb/0x16a0 net/bridge/br_netfilter_hooks.c:966 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xbf/0x220 net/netfilter/core.c:623 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK include/linux/netfilter.h:316 [inline] br_forward_finish+0x261/0x4d0 net/bridge/br_forward.c:66 br_nf_hook_thresh+0x30d/0x420 net/bridge/br_netfilter_hooks.c:1167 br_nf_forward_finish+0x693/0xb30 net/bridge/br_netfilter_hooks.c:662 NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] br_nf_forward_ip.part.0+0x61e/0x820 net/bridge/br_netfilter_hooks.c:716 br_nf_forward_ip net/bridge/br_netfilter_hooks.c:676 [inline] br_nf_forward+0xfe5/0x19f0 net/bridge/br_netfilter_hooks.c:773 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xbf/0x220 net/netfilter/core.c:623 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK include/linux/netfilter.h:316 [inline] __br_forward+0x2f6/0x970 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver+0xf0/0x180 net/bridge/br_forward.c:191 br_flood+0x193/0x650 net/bridge/br_forward.c:238 br_handle_frame_finish+0xff4/0x1f60 net/bridge/br_input.c:229 br_nf_hook_thresh+0x30d/0x420 net/bridge/br_netfilter_hooks.c:1167 br_nf_pre_routing_finish_ipv6+0x769/0xfb0 net/bridge/br_netfilter_ipv6.c:154 NF_HOOK include/linux/netfilter.h:318 [inline] br_nf_pre_routing_ipv6+0x39c/0x8b0 net/bridge/br_netfilter_ipv6.c:184 br_nf_pre_routing+0x90d/0x1550 net/bridge/br_netfilter_hooks.c:508 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_bridge_pre net/bridge/br_input.c:291 [inline] br_handle_frame+0xcdd/0x1520 net/bridge/br_input.c:442 __netif_receive_skb_core.constprop.0+0x6c5/0x3550 net/core/dev.c:6051 __netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:6162 __netif_receive_skb+0x1f/0x120 net/core/dev.c:6277 process_backlog+0x37a/0x1580 net/core/dev.c:6628 __napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7692 napi_poll net/core/dev.c:7755 [inline] net_rx_action+0xa40/0xf20 net/core/dev.c:7912 handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622 do_softirq kernel/softirq.c:523 [inline] do_softirq+0xac/0xe0 kernel/softirq.c:510 __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline] kernel_fpu_end arch/x86/kernel/fpu/core.c:506 [inline] kernel_fpu_end+0x64/0x80 arch/x86/kernel/fpu/core.c:499 blake2s_compress+0x78/0xf0 lib/crypto/x86/blake2s.h:42 blake2s_final+0xc9/0x150 lib/crypto/blake2s.c:142 hmac.constprop.0+0x25d/0x480 drivers/net/wireguard/noise.c:325 kdf.constprop.0+0x14d/0x280 drivers/net/wireguard/noise.c:367 message_ephemeral+0x5e/0x70 drivers/net/wireguard/noise.c:493 wg_noise_handshake_create_initiation+0x322/0x610 drivers/net/wireguard/noise.c:545 wg_packet_send_handshake_initiation+0x19c/0x360 drivers/net/wireguard/send.c:34 wg_packet_handshake_send_worker+0x1c/0x30 drivers/net/wireguard/send.c:51 process_one_work+0xa23/0x19a0 kernel/workqueue.c:3276 process_scheduled_works kernel/workqueue.c:3359 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3440 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 net_ratelimit: 10346 callbacks suppressed 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:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, 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:4a:99:cc:9e:c3:79, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:4a:99:cc:9e:c3:79, 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:aa:aa:aa:aa:aa:0c, vlan:0) net_ratelimit: 13234 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:4a:99:cc:9e:c3:79, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:4a:99:cc:9e:c3:79, 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:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, 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:4a:99:cc:9e:c3:79, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)