bridge0: received packet on bridge_slave_0 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: (detected by 1, t=10502 jiffies, g=10497, q=945 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 9921 (4294956851-4294946930), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 9922 jiffies! g10497 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:27848 pid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x15ae/0x4660 kernel/sched/core.c:6701 schedule+0xbd/0x170 kernel/sched/core.c:6775 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168 rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667 rcu_gp_kthread+0x9d/0x3b0 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: 5989 Comm: syz.1.39 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:stack_trace_consume_entry+0xa2/0x270 kernel/stacktrace.c:93 Code: cc 41 0f b6 04 17 84 c0 0f 85 73 01 00 00 44 89 23 b0 01 e9 99 00 00 00 31 c0 e9 92 00 00 00 48 89 f8 48 c1 e8 03 80 3c 10 00 <74> 29 49 89 ff 48 89 74 24 08 49 89 d4 4c 89 04 24 4c 89 cb e8 c5 RSP: 0018:ffffc900001efd78 EFLAGS: 00000246 RAX: 1ffff9200003dfd0 RBX: ffffc900001efe8c RCX: ffff88802fad3c00 RDX: dffffc0000000000 RSI: ffffffff81e045ee RDI: ffffc900001efe80 RBP: 1ffff9200003dfd2 R08: ffffc900001efe90 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000100 R12: 0000000000000000 R13: 1ffff9200003dfd1 R14: ffffc900001efe88 R15: 1ffff9200003dfd1 FS: 00007fbac9df46c0(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcddfe7ee80 CR3: 000000005c6ad000 CR4: 00000000003506e0 Call Trace: arch_stack_walk+0x138/0x190 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770 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+0x17e/0x2c0 mm/slub.c:3519 skb_clone+0x1eb/0x370 net/core/skbuff.c:1915 deliver_clone net/bridge/br_forward.c:125 [inline] maybe_deliver+0x98/0x150 net/bridge/br_forward.c:191 br_flood+0x317/0x670 net/bridge/br_forward.c:237 br_handle_frame_finish+0xf2d/0x15c0 net/bridge/br_input.c:215 br_nf_hook_thresh+0x3cd/0x4a0 net/bridge/br_netfilter_hooks.c:1188 br_nf_pre_routing_finish_ipv6+0x9e5/0xd20 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:304 [inline] br_nf_pre_routing_ipv6+0x34d/0x6a0 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+0x1240/0x14d0 net/bridge/br_input.c:424 __netif_receive_skb_core+0xf94/0x3ac0 net/core/dev.c:5565 __netif_receive_skb_one_core net/core/dev.c:5669 [inline] __netif_receive_skb+0x74/0x290 net/core/dev.c:5785 process_backlog+0x380/0x710 net/core/dev.c:6113 __napi_poll+0xbb/0x460 net/core/dev.c:6675 napi_poll net/core/dev.c:6742 [inline] net_rx_action+0x65f/0xcc0 net/core/dev.c:6878 handle_softirqs+0x27d/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 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:qlink_to_object mm/kasan/quarantine.c:138 [inline] RIP: 0010:qlink_free mm/kasan/quarantine.c:143 [inline] RIP: 0010:qlist_free_all+0x47/0xd0 mm/kasan/quarantine.c:185 Code: bd 00 00 00 00 00 fc ff df 49 89 ef 4d 89 f4 4d 85 f6 75 0b 4c 89 ff e8 c7 04 00 00 49 89 c4 49 8b 2f 49 63 84 24 c0 00 00 00 <49> 29 c7 4c 89 e7 4c 89 fe e8 cb e8 ff ff 66 90 4c 89 f8 48 c1 e8 RSP: 0018:ffffc90004c86d30 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffffc90004c86d68 RCX: ffffea000077eac0 RDX: ffffea0000000000 RSI: 0000000000000004 RDI: ffff88801dfab870 RBP: ffff88801e7a5f00 R08: ffff8880b8d42103 R09: 1ffff110171a8420 R10: dffffc0000000000 R11: ffffed10171a8421 R12: ffff88801aa5bc80 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88801dfab870 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770 slab_alloc_node mm/slub.c:3495 [inline] __kmem_cache_alloc_node+0x194/0x250 mm/slub.c:3534 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] copy_verifier_state+0x8d5/0xd50 kernel/bpf/verifier.c:1810 push_stack+0x1b9/0x500 kernel/bpf/verifier.c:2078 check_cond_jmp_op+0x10a4/0x28b0 kernel/bpf/verifier.c:14808 do_check+0x6992/0xd0a0 kernel/bpf/verifier.c:17568 do_check_common+0xacc/0x1410 kernel/bpf/verifier.c:19914 do_check_main kernel/bpf/verifier.c:19977 [inline] bpf_check+0x66a6/0xf530 kernel/bpf/verifier.c:20657 bpf_prog_load+0x10fa/0x1610 kernel/bpf/syscall.c:2753 __sys_bpf+0x5ba/0x890 kernel/bpf/syscall.c:5494 __do_sys_bpf kernel/bpf/syscall.c:5598 [inline] __se_sys_bpf kernel/bpf/syscall.c:5596 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5596 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fbac8f9e559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbac9df4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fbac9225fa0 RCX: 00007fbac8f9e559 RDX: 0000000000000048 RSI: 0000200000000d80 RDI: 0000000000000005 RBP: 00007fbac90358b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbac9226038 R14: 00007fbac9225fa0 R15: 00007ffdddfa1da8 net_ratelimit: 6249 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) net_ratelimit: 15623 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)