ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 ticks this GP) idle=4f0c/1/0x4000000000000000 softirq=368770/368770 fqs=2 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P25912/1:b..l rcu: (detected by 0, t=10502 jiffies, g=273833, q=1019 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 23775 Comm: kworker/1:14 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: events_power_efficient gc_worker RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 89 fb e8 23 00 00 00 48 8b 3d 34 da 61 0c 48 89 de 5b e9 33 f8 5f 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0d d8 49 74 11 65 8b 15 f9 49 74 RSP: 0018:ffffc90000a08dd0 EFLAGS: 00000097 RAX: ffffffff81b2ad16 RBX: 0000000000000001 RCX: 0000000000010000 RDX: ffff888028eddd00 RSI: 0000000000000001 RDI: 0000000000000007 RBP: ffff888084d10300 R08: ffff888084d1019f R09: 1ffff110109a2033 R10: dffffc0000000000 R11: ffffed10109a2034 R12: ffff888028ede888 R13: 0000000000000001 R14: ffff8880b87282e0 R15: 1ffff110170e5052 FS: 0000000000000000(0000) GS:ffff88812537c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8d7fdde580 CR3: 000000004c9a4000 CR4: 00000000003526f0 Call Trace: cpu_max_bits_warn include/linux/cpumask.h:138 [inline] cpumask_check include/linux/cpumask.h:145 [inline] cpumask_test_cpu include/linux/cpumask.h:649 [inline] cpu_online include/linux/cpumask.h:1231 [inline] trace_hrtimer_expire_exit include/trace/events/timer.h:321 [inline] __run_hrtimer kernel/time/hrtimer.c:2035 [inline] __hrtimer_run_queues+0x404/0xa10 kernel/time/hrtimer.c:2096 hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline] __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:seqcount_lockdep_reader_access+0xed/0x100 include/linux/seqlock.h:76 Code: 00 75 11 e8 95 fd fc f7 4d 85 f6 75 16 e8 8b fd fc f7 eb 15 e8 84 fd fc f7 e8 6f cc de 01 4d 85 f6 74 ea e8 75 fd fc f7 fb 5b <41> 5e c3 cc cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 RSP: 0018:ffffc90006f97990 EFLAGS: 00000293 RAX: ffffffff89c8f8ab RBX: 0000000000000000 RCX: ffff888028eddd00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90006f97af0 R08: ffffffff903116f7 R09: 1ffffffff20622de R10: dffffc0000000000 R11: fffffbfff20622df R12: dffffc0000000000 R13: 1ffff11009688cf9 R14: 0000000000000200 R15: 000000000002e731 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:343 [inline] gc_worker+0x304/0x12b0 net/netfilter/nf_conntrack_core.c:1509 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 task:syz.0.13560 state:R running task stack:27264 pid:25912 tgid:25911 ppid:19640 task_flags:0x400140 flags:0x00080003 Call Trace: context_switch kernel/sched/core.c:5504 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7409 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12 __local_bh_enable_ip+0xe1/0x130 kernel/softirq.c:457 local_bh_enable include/linux/bottom_half.h:33 [inline] xdp_test_run_batch net/bpf/test_run.c:356 [inline] bpf_test_run_xdp_live+0x1976/0x1c20 net/bpf/test_run.c:378 bpf_prog_test_run_xdp+0x7d8/0x11d0 net/bpf/test_run.c:1429 bpf_prog_test_run+0x2c5/0x340 kernel/bpf/syscall.c:4742 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6292 __do_sys_bpf kernel/bpf/syscall.c:6387 [inline] __se_sys_bpf kernel/bpf/syscall.c:6385 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5f3439ce59 RSP: 002b:00007f5f35267028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f5f34615fa0 RCX: 00007f5f3439ce59 RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a RBP: 00007f5f34432e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5f34616038 R14: 00007f5f34615fa0 R15: 00007fff06e63908 rcu: rcu_preempt kthread starved for 6987 jiffies! g273833 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:28120 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5504 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228 __schedule_loop kernel/sched/core.c:7307 [inline] schedule+0x164/0x360 kernel/sched/core.c:7322 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 3298 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x10b0/0x14b0 kernel/smp.c:892 Code: c0 75 73 41 8b 1e 89 de 83 e6 01 31 ff e8 98 02 0c 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 44 fe 0b 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 29 fe 0b RSP: 0018:ffffc9000dee7720 EFLAGS: 00000293 RAX: ffffffff81b9f7f7 RBX: dffffc0000000000 RCX: ffff888032c7be00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000dee7860 R08: ffffffff903116f7 R09: 1ffffffff20622de R10: dffffc0000000000 R11: fffffbfff20622df R12: 1ffff110170e8199 R13: ffff8880b863c2c8 R14: ffff8880b8740cc8 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff88812527c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2ec5c6 CR3: 000000000e746000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2773 [inline] smp_text_poke_batch_finish+0x5fd/0x1110 arch/x86/kernel/alternative.c:2983 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:906 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!