bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P30/1:b..l rcu: (detected by 1, t=10503 jiffies, g=15113, q=471 ncpus=2) task:khungtaskd state:R running task stack:28928 pid:30 tgid:30 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x184f/0x4c30 kernel/sched/core.c:6690 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7012 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] RIP: 0010:watchdog+0x30e/0x1040 kernel/hung_task.c:379 Code: 03 48 89 4c 24 60 42 80 3c 31 00 48 89 44 24 10 74 15 48 89 d3 48 8b 7c 24 10 e8 7d 9e 69 00 48 89 da 48 8b 44 24 10 48 8b 18 <48> 83 c3 10 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 0e 48 89 d5 48 RSP: 0018:ffffc90000a67e40 EFLAGS: 00000246 RAX: ffff888064a86310 RBX: ffff888027bf6180 RCX: 1ffff1100c950c62 RDX: ffff888064a85ef8 RSI: 0000000000000402 RDI: 0000000000000002 RBP: ffff888027bf6810 R08: ffffffff81950677 R09: 1ffffffff2859b00 R10: dffffc0000000000 R11: fffffbfff2859b01 R12: 7fffffffffffffff R13: 1ffffffff1cc1e40 R14: dffffc0000000000 R15: 00000000003ffec3 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: rcu_preempt kthread starved for 10523 jiffies! g15113 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:25920 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x184f/0x4c30 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/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: CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__dev_queue_xmit+0x1744/0x3ed0 Code: c8 c3 f7 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 78 0f b6 04 01 84 c0 0f 85 a0 0e 00 00 8b 84 24 70 02 00 00 e9 41 01 00 00 <48> 8b 7c 24 10 48 8b 74 24 30 48 8d 94 24 80 02 00 00 e8 85 c0 ff RSP: 0018:ffffc900001e6120 EFLAGS: 00000293 RAX: 0000000000000100 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88801d2f0000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: ffffc900001e6410 R08: ffffffff8993ae09 R09: 1ffffffff203a11d R10: dffffc0000000000 R11: fffffbfff203a11e R12: 1ffff1100fbb2000 R13: 1ffff1100c8fa528 R14: ffff8880647d2940 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4b385f3868 CR3: 000000006591a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dev_queue_xmit include/linux/netdevice.h:3094 [inline] br_dev_queue_push_xmit+0x703/0x8d0 net/bridge/br_forward.c:53 NF_HOOK+0x700/0x7c0 include/linux/netfilter.h:314 br_nf_post_routing+0xa20/0xe80 net/bridge/br_netfilter_hooks.c:994 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] NF_HOOK+0x2a7/0x460 include/linux/netfilter.h:312 br_forward_finish+0xd8/0x130 net/bridge/br_forward.c:66 br_nf_forward_finish+0xb49/0xfb0 net/bridge/br_netfilter_hooks.c:690 NF_HOOK+0x700/0x7c0 include/linux/netfilter.h:314 br_nf_forward_ip+0x61e/0x7b0 net/bridge/br_netfilter_hooks.c:744 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] NF_HOOK+0x2a7/0x460 include/linux/netfilter.h:312 __br_forward+0x489/0x660 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver+0xb3/0x150 net/bridge/br_forward.c:190 br_flood+0x2e4/0x660 net/bridge/br_forward.c:236 br_handle_frame_finish+0x18ba/0x1fe0 net/bridge/br_input.c:215 br_nf_hook_thresh+0x472/0x590 br_nf_pre_routing_finish_ipv6+0xaa0/0xdd0 NF_HOOK include/linux/netfilter.h:314 [inline] br_nf_pre_routing_ipv6+0x379/0x770 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x9fd/0x1530 net/bridge/br_input.c:424 __netif_receive_skb_core+0x13e8/0x4570 net/core/dev.c:5564 __netif_receive_skb_one_core net/core/dev.c:5668 [inline] __netif_receive_skb+0x12f/0x650 net/core/dev.c:5783 process_backlog+0x662/0x15b0 net/core/dev.c:6115 __napi_poll+0xcb/0x490 net/core/dev.c:6779 napi_poll net/core/dev.c:6848 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:6970 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:927 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/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:36:50:8d:a1:ea:a6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0) net_ratelimit: 29025 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:36:50:8d:a1:ea:a6, vlan:0)