bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P16821/1:b..l rcu: (detected by 1, t=10503 jiffies, g=56053, q=2526 ncpus=2) task:syz.0.3226 state:R running task stack:27808 pid:16821 tgid:16818 ppid:5819 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__reset_page_owner+0x55/0x1f0 mm/page_owner.c:311 Code: 0f 84 52 01 00 00 48 8b 0d f8 9b 51 0c 48 8d 1c 08 48 83 c3 08 48 89 d9 48 c1 e9 03 48 ba 00 00 00 00 00 fc ff df 0f b6 0c 11 <84> c9 0f 85 49 01 00 00 8b 1b 48 89 c7 e8 59 e0 01 00 bf 00 20 00 RSP: 0018:ffffc900052af970 EFLAGS: 00000a06 RAX: ffff88801b962380 RBX: ffff88801b962390 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000003 R08: ffffffff823c2e52 R09: ffffffff8e75e5e0 R10: dffffc0000000000 R11: fffff940000e36c7 R12: ffffea000071b600 R13: 0000000000000003 R14: ffffea000071b600 R15: 0000004f62d1908a reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978 __slab_free+0x263/0x2b0 mm/slub.c:5573 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:406 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5380 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] ref_tracker_alloc+0x15a/0x4c0 lib/ref_tracker.c:270 __netns_tracker_alloc include/net/net_namespace.h:367 [inline] netns_tracker_alloc include/net/net_namespace.h:376 [inline] get_net_track+0x16e/0x230 include/net/net_namespace.h:393 sk_alloc+0x1d6/0x390 net/core/sock.c:2318 inet6_create+0x7f0/0x1260 net/ipv6/af_inet6.c:185 __sock_create+0x4b2/0x9d0 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd6/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff51619c819 RSP: 002b:00007ff5170f1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007ff516415fa0 RCX: 00007ff51619c819 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000000a RBP: 00007ff516232c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff516416038 R14: 00007ff516415fa0 R15: 00007ffd3f1d3658 rcu: rcu_preempt kthread starved for 1236 jiffies! g56053 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:27744 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0x164/0x360 kernel/sched/core.c:7008 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:436 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: CPU: 1 UID: 0 PID: 58 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872 Code: e9 30 ff ff ff e8 85 e4 0d 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 01 02 7b 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 3e 94 73 RSP: 0018:ffffc90000a08120 EFLAGS: 00000292 RAX: bcfd8944dbdf3b00 RBX: 0000000000000246 RCX: 0000000080000101 RDX: 000000008eba6367 RSI: ffffffff8e16b62d RDI: ffffffff8c27d100 RBP: 0000000000000000 R08: ffffffff8a793f02 R09: ffffffff8e75e5e0 R10: dffffc0000000000 R11: ffffed100d3da9d3 R12: 0000000000000002 R13: ffffffff8e75e5e0 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125557000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f762a9e9f00 CR3: 000000003f6d6000 CR4: 00000000003526f0 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] nf_hook include/linux/netfilter.h:242 [inline] NF_HOOK+0xc3/0x3f0 include/linux/netfilter.h:316 __br_forward+0x397/0x540 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver net/bridge/br_forward.c:191 [inline] br_flood+0x6ee/0xb80 net/bridge/br_forward.c:238 br_handle_frame_finish+0x14c2/0x1bb0 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+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:6068 __netif_receive_skb_one_core net/core/dev.c:6179 [inline] __netif_receive_skb net/core/dev.c:6294 [inline] process_backlog+0x76d/0x1950 net/core/dev.c:6645 __napi_poll+0xae/0x340 net/core/dev.c:7709 napi_poll net/core/dev.c:7772 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7929 handle_softirqs+0x22a/0x870 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+0x2d3/0x3b0 drivers/net/wireguard/noise.c:332 kdf+0x126/0x2b0 drivers/net/wireguard/noise.c:367 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:3276 [inline] process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 net_ratelimit: 2185 callbacks suppressed bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) net_ratelimit: 3441 callbacks suppressed bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1) bridge0: received packet on 1¾x9ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:1)