bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8414/1:b..l rcu: (detected by 1, t=10502 jiffies, g=37869, q=202 ncpus=2) task:syz.1.714 state:R running task stack:25160 pid:8414 ppid:5795 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6866 preempt_schedule+0xab/0xc0 kernel/sched/core.c:6890 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] zap_pte_range mm/memory.c:1522 [inline] zap_pmd_range mm/memory.c:1570 [inline] zap_pud_range mm/memory.c:1599 [inline] zap_p4d_range mm/memory.c:1620 [inline] unmap_page_range+0x236f/0x2fe0 mm/memory.c:1641 unmap_vmas+0x25e/0x3a0 mm/memory.c:1731 exit_mmap+0x200/0xb50 mm/mmap.c:3302 __mmput+0x118/0x3c0 kernel/fork.c:1355 exit_mm+0x1da/0x2c0 kernel/exit.c:569 do_exit+0x88e/0x23c0 kernel/exit.c:870 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024 get_signal+0x12fc/0x1400 kernel/signal.c:2902 arch_do_signal_or_restart+0x9c/0x7b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f128db8f6c9 RSP: 002b:00007f128ea3a038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: 0000000000010106 RBX: 00007f128dde6090 RCX: 00007f128db8f6c9 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f128dc11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f128dde6128 R14: 00007f128dde6090 R15: 00007ffdee557438 rcu: rcu_preempt kthread starved for 4126 jiffies! g37869 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:27752 pid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:-1 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline] RIP: 0010:unwind_next_frame+0x506/0x2970 arch/x86/kernel/unwind_orc.c:494 Code: 00 00 00 00 fc ff df eb 97 44 89 f9 80 e1 07 80 c1 03 38 c1 7c b5 4c 89 ff e8 86 42 a2 00 eb ab e8 4f e7 4a 00 48 2b 6c 24 28 <49> 89 ec 49 bd 00 00 00 00 00 fc ff df 48 8b 6c 24 10 48 8b 44 24 RSP: 0018:ffffc900001efcb8 EFLAGS: 00000246 RAX: ffffffff813aa841 RBX: ffffffff8e5ad4b8 RCX: ffff88801b273c00 RDX: 0000000000000100 RSI: ffffffff81519f86 RDI: ffffffff81519ec8 RBP: 0000000000000000 R08: ffffc900001efe50 R09: 0000000000000012 R10: 0000000000000004 R11: 0000000000000100 R12: ffffffff8e5ad4bc R13: ffffffff81519ec8 R14: ffffffff81519f86 R15: ffffffff8e5ad4b8 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000022a030 CR3: 0000000060e78000 CR4: 00000000003506e0 Call Trace: arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3519 skb_clone+0x1eb/0x370 net/core/skbuff.c:1911 deliver_clone net/bridge/br_forward.c:125 [inline] maybe_deliver+0x98/0x150 net/bridge/br_forward.c:190 br_flood+0x31b/0x680 net/bridge/br_forward.c:236 br_handle_frame_finish+0x144f/0x1920 net/bridge/br_input.c:215 br_nf_hook_thresh+0x3b6/0x480 net/bridge/br_netfilter_hooks.c:1184 br_nf_pre_routing_finish_ipv6+0x9e3/0xd90 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:304 [inline] br_nf_pre_routing_ipv6+0x34d/0x680 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x96b/0x1480 net/bridge/br_input.c:424 __netif_receive_skb_core+0xf6b/0x3ac0 net/core/dev.c:5502 __netif_receive_skb_one_core net/core/dev.c:5606 [inline] __netif_receive_skb+0x74/0x290 net/core/dev.c:5722 process_backlog+0x380/0x6e0 net/core/dev.c:6050 __napi_poll+0xc0/0x460 net/core/dev.c:6612 napi_poll net/core/dev.c:6679 [inline] net_rx_action+0x5ea/0xbf0 net/core/dev.c:6815 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:148 Code: cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d c3 64 39 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 66 0f 1f 00 55 41 57 41 56 RSP: 0018:ffffc90000187de0 EFLAGS: 000002c2 RAX: 28d6a3bd179d6000 RBX: ffffffff816187ab RCX: 28d6a3bd179d6000 RDX: 0000000000000001 RSI: ffffffff8aaabce0 RDI: ffffffff8afc6b00 RBP: ffffc90000187f20 R08: ffff8880b8f36b2b R09: 1ffff110171e6d65 R10: dffffc0000000000 R11: ffffed10171e6d66 R12: ffffffff8e4a8d68 R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff1100364e780 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:753 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97 cpuidle_idle_call kernel/sched/idle.c:170 [inline] do_idle+0x1eb/0x510 kernel/sched/idle.c:282 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380 start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323 secondary_startup_64_no_verify+0x179/0x17b net_ratelimit: 15831 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) net_ratelimit: 15839 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) net_ratelimit: 16918 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) net_ratelimit: 16572 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) net_ratelimit: 15816 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) net_ratelimit: 15824 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) net_ratelimit: 16815 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) net_ratelimit: 16818 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:de:35:c3:ec:15:d6, vlan:0)