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 bridge_slave_0 with own address as source address (addr:00:00:00:00:07:00, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P22377/1:b..l rcu: (detected by 0, t=10502 jiffies, g=246349, q=947 ncpus=1) task:syz.1.5548 state:R running task stack:26408 pid:22377 tgid:22377 ppid:12427 task_flags:0x40044c flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5387 [inline] __schedule+0x10e9/0x6820 kernel/sched/core.c:7188 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7512 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline] irqentry_exit+0x1fe/0x790 kernel/entry/common.c:164 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__kasan_check_byte+0x1f/0x50 mm/kasan/common.c:578 Code: 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 41 54 49 89 f4 55 48 89 fd 53 e8 9d 1e 00 00 89 c3 84 c0 74 0b 89 d8 5b 5d 41 5c cc cc cc cc 4c 89 e1 48 89 ef 31 d2 be 01 00 00 00 e8 1a 04 00 RSP: 0018:ffffc900035a6d40 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff81b83ec1 RDI: fffffbfff1cfca4c RBP: ffffffff8e7e5260 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000200 R11: 000000000000c820 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire kernel/locking/lockdep.c:5842 [inline] lock_acquire+0x12a/0x370 kernel/locking/lockdep.c:5825 rcu_lock_acquire include/linux/rcupdate.h:300 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] class_rcu_constructor include/linux/rcupdate.h:1181 [inline] unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 save_stack+0x162/0x1e0 mm/page_owner.c:165 __reset_page_owner+0x84/0x190 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1404 [inline] free_unref_folios+0xa0d/0x16f0 mm/page_alloc.c:3006 folios_put_refs+0x53c/0x840 mm/swap.c:1002 free_pages_and_swap_cache+0x22d/0x3b0 mm/swap_state.c:401 __tlb_batch_free_encoded_pages+0xe9/0x280 mm/mmu_gather.c:138 tlb_batch_pages_flush mm/mmu_gather.c:151 [inline] tlb_flush_mmu_free mm/mmu_gather.c:417 [inline] tlb_flush_mmu+0xe9/0x590 mm/mmu_gather.c:424 zap_pte_range mm/memory.c:1957 [inline] zap_pmd_range mm/memory.c:2004 [inline] zap_pud_range mm/memory.c:2032 [inline] zap_p4d_range mm/memory.c:2053 [inline] __zap_vma_range+0x230e/0x4bf0 mm/memory.c:2093 unmap_vmas+0x299/0x5f0 mm/memory.c:2162 exit_mmap+0x1ef/0xa10 mm/mmap.c:1300 __mmput+0x12a/0x410 kernel/fork.c:1178 mmput+0x67/0x80 kernel/fork.c:1201 exit_mm kernel/exit.c:581 [inline] do_exit+0x833/0x2a60 kernel/exit.c:963 do_group_exit+0xd5/0x2a0 kernel/exit.c:1117 get_signal+0x1ec7/0x21e0 kernel/signal.c:3037 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline] do_syscall_64+0x6f2/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7f0759c582 RSP: 002b:00007fffc873adc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: 00007f7f0845d000 RBX: 0000000000000000 RCX: 00007f7f0759c582 RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000 RBP: 0000000000020022 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 00007fffc873af30 R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 533 jiffies! g246349 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:27848 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5387 [inline] __schedule+0x10e9/0x6820 kernel/sched/core.c:7188 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0xdd/0x390 kernel/sched/core.c:7282 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+0x72b/0xd50 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: 3417 Comm: kworker/R-bat_e Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: bat_events batadv_dat_purge RIP: 0010:memset_orig+0x70/0xb0 arch/x86/lib/memset_64.S:90 Code: 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 89 d1 83 e1 38 74 14 c1 e9 03 66 0f 1f 44 00 00 c9 48 89 07 48 8d 7f 08 75 f5 83 e2 07 74 0a ff ca 88 07 48 8d RSP: 0018:ffffc900000072d8 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff8880b1a7c000 RCX: 0000000000000001 RDX: 000000000000001e RSI: 0000000000000000 RDI: ffffed101634f810 RBP: 00000000000000f0 R08: 0000000000000001 R09: 0000000000000000 R10: ffffed101634f800 R11: 0000000000000000 R12: ffff88801feab140 R13: 0000000000000820 R14: ffff888034418000 R15: 00000000000000f0 FS: 0000000000000000(0000) GS:ffff8881242f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555571c634e8 CR3: 00000000233ee000 CR4: 00000000003526f0 Call Trace: kasan_unpoison+0x27/0x60 mm/kasan/shadow.c:178 unpoison_slab_object mm/kasan/common.c:336 [inline] __kasan_slab_alloc+0x4e/0x90 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4569 [inline] slab_alloc_node mm/slub.c:4898 [inline] kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4905 skb_clone+0x190/0x400 net/core/skbuff.c:2107 deliver_clone net/bridge/br_forward.c:125 [inline] br_flood+0x35c/0x650 net/bridge/br_forward.c:250 br_handle_frame_finish+0xff4/0x1f60 net/bridge/br_input.c:229 br_nf_hook_thresh+0x30d/0x420 net/bridge/br_netfilter_hooks.c:1161 br_nf_pre_routing_finish_ipv6+0x659/0xdd0 net/bridge/br_netfilter_ipv6.c:153 NF_HOOK include/linux/netfilter.h:318 [inline] br_nf_pre_routing_ipv6+0x39c/0x8b0 net/bridge/br_netfilter_ipv6.c:183 br_nf_pre_routing+0x90f/0x1560 net/bridge/br_netfilter_hooks.c:509 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+0x6c5/0x3530 net/core/dev.c:6096 __netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:6207 __netif_receive_skb+0x1f/0x120 net/core/dev.c:6322 process_backlog+0x37a/0x1580 net/core/dev.c:6673 __napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7737 napi_poll net/core/dev.c:7800 [inline] net_rx_action+0xa40/0xf20 net/core/dev.c:7957 handle_softirqs+0x1ea/0xa00 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 spin_unlock_bh include/linux/spinlock.h:396 [inline] __batadv_dat_purge.part.0+0x294/0x3c0 net/batman-adv/distributed-arp-table.c:185 __batadv_dat_purge net/batman-adv/distributed-arp-table.c:166 [inline] batadv_dat_purge+0x4b/0xa0 net/batman-adv/distributed-arp-table.c:204 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302 process_scheduled_works kernel/workqueue.c:3385 [inline] rescuer_thread+0x905/0x14a0 kernel/workqueue.c:3609 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 net_ratelimit: 17232 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:07:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:9a:9d:9b:6f:6a:b5, 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 bridge_slave_0 with own address as source address (addr:00:00:00:00:07:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:07:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:9a:9d:9b:6f:6a:b5, 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 bridge_slave_0 with own address as source address (addr:00:00:00:00:07:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:07:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:9a:9d:9b:6f:6a:b5, vlan:0) net_ratelimit: 23143 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:9a:9d:9b:6f:6a:b5, 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 bridge_slave_0 with own address as source address (addr:00:00:00:00:07:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:07:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:9a:9d:9b:6f:6a:b5, 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 bridge_slave_0 with own address as source address (addr:00:00:00:00:07:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:07:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:9a:9d:9b:6f:6a:b5, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)