bridge0: received packet on veth0_to_bridge 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: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5916/1:b..l rcu: (detected by 0, t=10502 jiffies, g=11589, q=1097 ncpus=2) task:syz.0.15 state:R running task stack:27816 pid:5916 ppid:5775 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x15ae/0x4660 kernel/sched/core.c:6701 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6868 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6892 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:1523 [inline] zap_pmd_range mm/memory.c:1571 [inline] zap_pud_range mm/memory.c:1600 [inline] zap_p4d_range mm/memory.c:1621 [inline] unmap_page_range+0x2577/0x32f0 mm/memory.c:1642 unmap_vmas+0x286/0x3f0 mm/memory.c:1732 exit_mmap+0x238/0xb90 mm/mmap.c:3302 __mmput+0x118/0x3a0 kernel/fork.c:1362 exit_mm+0x23f/0x340 kernel/exit.c:576 do_exit+0x909/0x2530 kernel/exit.c:877 __do_sys_exit kernel/exit.c:999 [inline] __se_sys_exit kernel/exit.c:997 [inline] __x64_sys_exit+0x40/0x40 kernel/exit.c:997 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: 0033:0x7f3c0599e559 RSP: 002b:00007f3c0689bfd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 00007f3c05c25fa0 RCX: 00007f3c0599e559 RDX: 00007f3c0689c9c8 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f3c05a358b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3c05c26038 R14: 00007f3c05c25fa0 R15: 00007ffe46fd91b8 rcu: rcu_preempt kthread starved for 8293 jiffies! g11589 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:25960 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: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5921 Comm: syz.2.18 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline] RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline] RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline] RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline] RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:196 Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 89 f6 31 d2 e9 cb 31 2e 03 66 2e 0f 1f 84 00 00 00 00 00 RSP: 0018:ffffc900001ef5d8 EFLAGS: 00000046 RAX: 000000000000044c RBX: ffff8880b8d282c0 RCX: 0000000000000838 RDX: 0000000000000000 RSI: 000000000000044c RDI: 0000000000000838 RBP: 0000000000000000 R08: ffffffff8f6c5aef R09: 1ffffffff1ed8b5d R10: dffffc0000000000 R11: fffffbfff1ed8b5e R12: dffffc0000000000 R13: 0000000010002696 R14: 000000000000044c R15: 0000000000000020 FS: 00007ff5c64166c0(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2f0efe CR3: 000000005b0b7000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: apic_write arch/x86/include/asm/apic.h:404 [inline] lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:448 clockevents_program_event+0x1c0/0x310 kernel/time/clockevents.c:334 hrtimer_interrupt+0x565/0x980 kernel/time/hrtimer.c:1893 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline] __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:208 Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 7c cc e4 0d 48 89 de 5b e9 73 10 58 00 cc cc cc 0f 1e fa 48 8b 04 24 65 48 8b 0d 40 27 7c 7e 65 8b 15 41 27 7c RSP: 0018:ffffc900001ef810 EFLAGS: 00000246 RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000000001 RDX: ffffffff8a83a6ba RSI: ffffffff8f544c00 RDI: 000000000000006c RBP: ffff000000000500 R08: ffff8880297dbc00 R09: 0000000000000006 R10: 000000000000007a R11: 0000000000000100 R12: ffffffff8acb9141 R13: ffff0a0000000500 R14: ffffffff8acb9144 R15: 000000000000006c format_decode+0xc07/0x1400 lib/vsprintf.c:2688 vsnprintf+0xeb/0x1ba0 lib/vsprintf.c:2775 sprintf+0xe8/0x140 lib/vsprintf.c:3027 print_time kernel/printk/printk.c:1327 [inline] info_print_prefix+0x16c/0x360 kernel/printk/printk.c:1353 record_print_text+0x182/0x4a0 kernel/printk/printk.c:1402 printk_get_next_message+0x2ab/0x980 kernel/printk/printk.c:2876 console_emit_next_record kernel/printk/printk.c:2911 [inline] console_flush_all+0x38d/0xcf0 kernel/printk/printk.c:3000 console_unlock+0xad/0x350 kernel/printk/printk.c:3069 vprintk_emit+0x497/0x610 kernel/printk/printk.c:2341 _printk+0xde/0x130 kernel/printk/printk.c:2366 br_fdb_update+0x610/0x680 net/bridge/br_fdb.c:878 br_handle_frame_finish+0x5ee/0x15c0 net/bridge/br_input.c:141 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:finish_task_switch+0x267/0x8f0 kernel/sched/core.c:5256 Code: 35 09 85 c0 0f 84 30 01 00 00 48 85 db 0f 85 4f 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 e3 e9 3e 09 e8 2e 28 30 00 fb 4c 8b 65 b8 <49> 8d bc 24 00 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc90005046900 EFLAGS: 00000286 RAX: d47c280f0d2ea900 RBX: 0000000000000000 RCX: d47c280f0d2ea900 RDX: dffffc0000000000 RSI: ffffffff8acacfe0 RDI: ffffffff8b1d5160 RBP: ffffc90005046950 R08: ffffffff8f6c5aef R09: 1ffffffff1ed8b5d R10: dffffc0000000000 R11: fffffbfff1ed8b5e R12: ffff8880297dbc00 R13: 1ffff110171a79a1 R14: dffffc0000000000 R15: ffff8880b8d3cd08 context_switch kernel/sched/core.c:5385 [inline] __schedule+0x15b6/0x4660 kernel/sched/core.c:6701 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011 irqentry_exit+0x67/0x70 kernel/entry/common.c:441 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:check_kcov_mode kernel/kcov.c:180 [inline] RIP: 0010:write_comp_data kernel/kcov.c:241 [inline] RIP: 0010:__sanitizer_cov_trace_cmp4+0x30/0x90 kernel/kcov.c:283 Code: 04 24 65 48 8b 15 c0 25 7c 7e 65 8b 0d c1 25 7c 7e 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 24 16 00 00 00 74 52 <8b> 8a 00 16 00 00 83 f9 03 75 47 48 8b 8a 08 16 00 00 44 8b 8a 04 RSP: 0018:ffffc90005046cf0 EFLAGS: 00000246 RAX: ffffffff81a657ad RBX: ffffffff8d2a4248 RCX: 0000000000000000 RDX: ffff8880297dbc00 RSI: 0000000000000004 RDI: 000000000000000c RBP: dffffc0000000000 R08: ffff8880297dbc00 R09: 0000000000000012 R10: 0000000000000012 R11: 0000000000000002 R12: 0000000000000004 R13: 0000000000000000 R14: 000000000000000c R15: 000000000003552d btf_find_by_name_kind+0x22d/0x480 kernel/bpf/btf.c:545 btf_nested_type_is_trusted+0x420/0xeb0 kernel/bpf/btf.c:8555 type_is_trusted kernel/bpf/verifier.c:6491 [inline] check_ptr_to_btf_access+0x7f3/0xcc0 kernel/bpf/verifier.c:6610 check_mem_access+0xd60/0x19c0 kernel/bpf/verifier.c:7002 check_atomic kernel/bpf/verifier.c:7131 [inline] do_check+0xb403/0xd0a0 kernel/bpf/verifier.c:17400 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: 0033:0x7ff5c559e559 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:00007ff5c6416028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ff5c5825fa0 RCX: 00007ff5c559e559 RDX: 0000000000000094 RSI: 0000200000000a80 RDI: 0000000000000005 RBP: 00007ff5c56358b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff5c5826038 R14: 00007ff5c5825fa0 R15: 00007ffc8d915758 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:72:92:78:7a:14:76, 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:72:92:78:7a:14:76, 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: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:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:72:92:78:7a:14:76, 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: 6748 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:72:92:78:7a:14:76, 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:aa:aa:aa:aa:aa:1b, 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) 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:72:92:78:7a:14:76, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)