bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:0e:41:91:98:0a:18, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10518/1:b..l rcu: (detected by 0, t=10518 jiffies, g=45433, q=639 ncpus=2) task:syz.4.1124 state:R running task stack:25544 pid:10518 tgid:10516 ppid:5622 task_flags:0x400140 flags:0x00080003 Call Trace: context_switch kernel/sched/core.c:5526 [inline] __schedule+0x17db/0x58f0 kernel/sched/core.c:7277 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7599 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:rcu_is_watching+0x0/0xb0 kernel/rcu/tree.c:749 Code: c7 c7 80 20 d6 8e e8 8f 1d 70 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 41 57 41 56 53 65 48 ff 05 4f bd e8 11 e8 5a 6f 39 0a RSP: 0018:ffffc90006f0ee78 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffffff8241f5ad RCX: ffff888026533e80 RDX: 00000000105209fd RSI: ffffffff8e69c835 RDI: ffffffff8c6da080 RBP: 1ffff92000de1dec R08: ffffffff8177f1df R09: 0000000000000000 R10: ffffc90006f0ef78 R11: ffffffff81b28ab0 R12: dffffc0000000000 R13: ffffffff8177f1df R14: ffffc90006f0ef28 R15: 1ffff92000de1de5 rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1216 [inline] unwind_next_frame+0xbe/0x2550 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:183 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:359 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 __alloc_pages_noprof+0x10/0x100 mm/page_alloc.c:5471 alloc_pages_bulk_noprof+0x5fa/0x7c0 mm/page_alloc.c:5295 ___alloc_pages_bulk mm/kasan/shadow.c:345 [inline] __kasan_populate_vmalloc_do mm/kasan/shadow.c:370 [inline] __kasan_populate_vmalloc+0xb7/0x1c0 mm/kasan/shadow.c:424 kasan_populate_vmalloc include/linux/kasan.h:580 [inline] alloc_vmap_area+0xd1a/0x1420 mm/vmalloc.c:2145 __get_vm_area_node+0x200/0x2f0 mm/vmalloc.c:3248 __vmalloc_node_range_noprof+0x343/0x1540 mm/vmalloc.c:4064 __bpf_map_area_alloc kernel/bpf/syscall.c:404 [inline] bpf_map_area_alloc+0x12d/0x170 kernel/bpf/syscall.c:411 htab_map_alloc+0x389/0xc90 kernel/bpf/hashtab.c:605 map_create_alloc kernel/bpf/syscall.c:1534 [inline] map_create+0xf3d/0x1b70 kernel/bpf/syscall.c:1644 __sys_bpf+0xaea/0xd90 kernel/bpf/syscall.c:6344 __do_sys_bpf kernel/bpf/syscall.c:6486 [inline] __se_sys_bpf kernel/bpf/syscall.c:6483 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6483 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: 0033:0x7fd75f59e159 RSP: 002b:00007fd7604b7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fd75f825fa0 RCX: 00007fd75f59e159 RDX: 0000000000000048 RSI: 0000200000000000 RDI: 0000000000000000 RBP: 00007fd75f63506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd75f826038 R14: 00007fd75f825fa0 R15: 00007ffce797c3e8 rcu: rcu_preempt kthread starved for 982 jiffies! g45433 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: context_switch kernel/sched/core.c:5526 [inline] __schedule+0x17db/0x58f0 kernel/sched/core.c:7277 __schedule_loop kernel/sched/core.c:7354 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7369 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 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: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker RIP: 0010:skb_is_gso include/linux/skbuff.h:5298 [inline] RIP: 0010:netif_needs_gso include/linux/netdevice.h:5544 [inline] RIP: 0010:validate_xmit_skb+0x8f0/0x14f0 net/core/dev.c:4089 Code: 00 48 89 d8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 99 07 00 00 44 8b 23 4b 8d 1c 2c 48 83 c3 04 48 89 d8 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 98 07 00 00 4d 01 e5 0f b7 1b 31 ff 89 de e8 79 ee 15 RSP: 0018:ffffc90000a17cb0 EFLAGS: 00000a03 RAX: 0000000000000000 RBX: ffff888076dd0b44 RCX: ffff88801e2a5dc0 RDX: 8000000000000300 RSI: 0000000000000100 RDI: ffff88815b1c5c10 RBP: dffffc0000000000 R08: 0000000000000100 R09: 0000000000000002 R10: 0000000000004888 R11: 8000000000000300 R12: 0000000000000180 R13: ffff888076dd09c0 R14: ffff88815b1c5b40 R15: 1ffff1102b638b82 FS: 0000000000000000(0000) GS:ffff888124dce000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555797d5a38 CR3: 000000000eb48000 CR4: 00000000003526f0 Call Trace: __dev_queue_xmit+0xb04/0x3820 net/core/dev.c:4913 dev_queue_xmit include/linux/netdevice.h:3461 [inline] br_dev_queue_push_xmit+0x370/0x4b0 net/bridge/br_forward.c:53 NF_HOOK+0x360/0x3f0 include/linux/netfilter.h:325 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_arp net/bridge/br_netfilter_hooks.c:757 [inline] br_nf_forward+0xf53/0x18d0 net/bridge/br_netfilter_hooks.c:780 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 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver net/bridge/br_forward.c:191 [inline] br_flood+0x3e3/0x8d0 net/bridge/br_forward.c:245 br_handle_frame_finish+0x1119/0x1950 net/bridge/br_input.c:229 nf_hook_bridge_pre net/bridge/br_input.c:313 [inline] br_handle_frame+0x92e/0x1600 net/bridge/br_input.c:451 __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 __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_precomputed_dh drivers/net/wireguard/noise.c:426 [inline] wg_noise_handshake_create_initiation+0x460/0x810 drivers/net/wireguard/noise.c:560 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:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 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