bridge0: received packet on veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=10502 jiffies, g=52065, q=447 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10487 (4294981380-4294970893), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10488 jiffies! g52065 f0x2 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:27504 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2615 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5552 Comm: kworker/1:6 Not tainted 6.12.0-rc3-syzkaller-00013-geca631b8fe80 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:154 [inline] RIP: 0010:lock_release+0x3d0/0x6f0 kernel/locking/lockdep.c:5849 Code: 40 d3 6c 8b e8 a1 50 b7 09 b8 ff ff ff ff 65 0f c1 05 ec e2 97 7e 83 f8 01 0f 85 fd 01 00 00 9c 58 f6 c4 02 0f 85 e8 01 00 00 <48> f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df 48 RSP: 0018:ffffc90000a17eb0 EFLAGS: 00000046 RAX: 0000000000000046 RBX: 1ffff92000142fd8 RCX: ffffc90000a17f00 RDX: 1ffff1100572015a RSI: ffffffff8b6cd340 RDI: ffffffff8bd1a1c0 RBP: b29849a635ae3d5f R08: 0000000000000000 R09: fffffbfff20be7e1 R10: ffffffff905f3f0f R11: 0000000000000000 R12: 0000000000000006 R13: 0000000000000007 R14: ffff88802b900ad8 R15: ffff88802b900000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3151bff8 CR3: 000000000df7c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: seqcount_lockdep_reader_access include/linux/seqlock.h:73 [inline] timekeeping_debug_get_ns+0x97/0x5b0 kernel/time/timekeeping.c:256 timekeeping_get_ns kernel/time/timekeeping.c:401 [inline] ktime_get_update_offsets_now+0x100/0x310 kernel/time/timekeeping.c:2449 hrtimer_update_base kernel/time/hrtimer.c:634 [inline] hrtimer_interrupt+0x142/0x800 kernel/time/hrtimer.c:1799 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1026 [inline] __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1043 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2042 [inline] RIP: 0010:vprintk_emit+0x621/0x6f0 kernel/printk/printk.c:2406 Code: 85 ed 0f 85 81 00 00 00 e8 ac d6 1f 00 9c 41 5c 41 81 e4 00 02 00 00 31 ff 4c 89 e6 e8 08 d9 1f 00 4d 85 e4 0f 85 8d 00 00 00 8a d6 1f 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00 RSP: 0018:ffffc90000a181d0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 000000000000006e RCX: ffffffff816dac8e RDX: ffff88802b900000 RSI: ffffffff816dac98 RDI: 0000000000000007 RBP: 1ffff9200014303c R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000200 R14: ffff88802ee69e00 R15: ffffc90000a182b8 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:68 _printk+0xc8/0x100 kernel/printk/printk.c:2432 br_fdb_update+0x4b4/0x7c0 net/bridge/br_fdb.c:904 br_handle_frame_finish+0xd77/0x1c80 net/bridge/br_input.c:141 br_nf_hook_thresh+0x303/0x410 net/bridge/br_netfilter_hooks.c:1195 br_nf_pre_routing_finish_ipv6+0x76a/0xfb0 net/bridge/br_netfilter_ipv6.c:154 NF_HOOK include/linux/netfilter.h:314 [inline] br_nf_pre_routing_ipv6+0x3ce/0x8c0 net/bridge/br_netfilter_ipv6.c:184 br_nf_pre_routing+0x860/0x15b0 net/bridge/br_netfilter_hooks.c:533 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x9eb/0x1490 net/bridge/br_input.c:424 __netif_receive_skb_core.constprop.0+0xa3d/0x4330 net/core/dev.c:5560 __netif_receive_skb_one_core+0xb1/0x1e0 net/core/dev.c:5664 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5779 process_backlog+0x443/0x15f0 net/core/dev.c:6111 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6775 napi_poll net/core/dev.c:6844 [inline] net_rx_action+0xa92/0x1010 net/core/dev.c:6966 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554 do_softirq kernel/softirq.c:455 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:442 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382 spin_unlock_bh include/linux/spinlock.h:396 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline] nsim_dev_trap_report_work+0x870/0xc80 drivers/net/netdevsim/dev.c:850 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 bridge0: received packet on veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, 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 veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, 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 veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, 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 veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) net_ratelimit: 19458 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, 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 veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, 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 veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, 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 veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, 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 veth0_to_bridge with own address as source address (addr:92:89:ae:01:31:42, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)