bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on bridge_slave_1 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): P29350/1:b..l rcu: (detected by 1, t=10503 jiffies, g=171801, q=2760 ncpus=2) task:syz-executor state:R running task stack:21928 pid:29350 tgid:29350 ppid:29319 task_flags:0x400140 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5526 [inline] __schedule+0x17db/0x58f0 kernel/sched/core.c:7276 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7598 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:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947 Code: ff ff ff e8 f0 b9 41 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 42 b5 f1 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d c7 40 da RSP: 0018:ffffc90002e3f7a0 EFLAGS: 00000296 RAX: b548270aea273f00 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 0000000041c7ed29 RSI: ffffffff8e6feb5e RDI: ffffffff8c6d9c80 RBP: ffff88807a10be80 R08: ffffffff8177f1df R09: 0000000000000000 R10: ffffc90002e3f8d8 R11: ffffffff81b285f0 R12: ffffffff8ed5c8a0 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:309 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] class_rcu_constructor include/linux/rcupdate.h:1216 [inline] unwind_next_frame+0xac/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 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:338 reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 __slab_free+0x274/0x2c0 mm/slub.c:5815 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_noprof+0x2b9/0x600 mm/slub.c:5010 alloc_filename fs/namei.c:147 [inline] do_getname+0x2e/0x250 fs/namei.c:187 class_filename_flags_constructor include/linux/fs.h:2586 [inline] do_sys_openat2+0xcc/0x200 fs/open.c:1416 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1434 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: 0033:0x7f98b259d47c RSP: 002b:00007ffc6da48200 EFLAGS: 00000206 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000000002aa RCX: 00007f98b259d47c RDX: 0000000000090800 RSI: 00007f98b263497d RDI: 00000000ffffff9c RBP: 00007ffc6da482ac R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000000000c9 R13: 0000000000000000 R14: 00000000000e0467 R15: 00007ffc6da48300 rcu: rcu_preempt kthread starved for 671 jiffies! g171801 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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: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:7276 __schedule_loop kernel/sched/core.c:7353 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7368 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 3302 Comm: kworker/u8:10 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:__sanitizer_cov_trace_pc+0x0/0x80 kernel/kcov.c:206 Code: 89 fb e8 23 00 00 00 48 8b 3d b4 c5 ac 0c 48 89 de 5b e9 73 7e 64 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0d 48 15 cd 11 65 48 8b 15 48 15 RSP: 0018:ffffc90000007098 EFLAGS: 00000246 RAX: 1ffff920007a2a07 RBX: ffffc90003d15000 RCX: 8000000000000302 RDX: 0000000000000001 RSI: ffffffff8c6d9c60 RDI: ffffffff8c6d9c20 RBP: ffffc90000007280 R08: ffff8880755a1643 R09: 1ffff1100eab42c8 R10: dffffc0000000000 R11: ffffed100eab42c9 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888124cd2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557af8f184b0 CR3: 000000007f14c000 CR4: 00000000003526f0 Call Trace: ebt_do_table+0x19e/0x27c0 net/bridge/netfilter/ebtables.c:218 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+0x1329/0x1600 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/0x260 lib/crypto/blake2s.c:142 mix_hash drivers/net/wireguard/noise.c:439 [inline] handshake_init+0x182/0x1f0 drivers/net/wireguard/noise.c:460 wg_noise_handshake_create_initiation+0x1be/0x810 drivers/net/wireguard/noise.c:537 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 net_ratelimit: 12521 callbacks suppressed bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:d2:ac:d0:4a:7a:a5, vlan:0)