IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4701/3:b..l rcu: (detected by 0, t=10505 jiffies, g=154245, q=167 ncpus=2) task:syz.0.4330 state:R running task stack:26008 pid:4701 tgid:4701 ppid:25864 task_flags:0x400040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x125c/0x6730 kernel/sched/core.c:7234 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7413 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:190 spin_unlock include/linux/spinlock.h:390 [inline] filemap_map_pages+0x173f/0x1fe0 mm/filemap.c:3981 do_fault_around mm/memory.c:5818 [inline] do_read_fault mm/memory.c:5851 [inline] do_fault+0x985/0x1750 mm/memory.c:5994 do_pte_missing mm/memory.c:4566 [inline] handle_pte_fault mm/memory.c:6379 [inline] __handle_mm_fault+0x187d/0x2a00 mm/memory.c:6517 handle_mm_fault+0x37b/0xa30 mm/memory.c:6686 do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7efd4e472756 RSP: 002b:00007ffc1c831c40 EFLAGS: 00010202 RAX: 000000110c3a8000 RBX: ffffffff84cf294f RCX: 0000000000000001 RDX: 000000000000094f RSI: 0000000000003ca5 RDI: 0000000000000002 RBP: 0000000000000000 R08: 00007efd4e810000 R09: 00007efd4e812000 R10: 0000000084cf2953 R11: 0000000000000000 R12: 00007efd4e826038 R13: 0000000000000057 R14: ffffffff84cf250e R15: 00007efd4f355720 rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g154245 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=126340 rcu: rcu_preempt kthread starved for 10505 jiffies! g154245 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28824 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x125c/0x6730 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0xdd/0x2c0 kernel/sched/core.c:7326 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 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: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026 RIP: 0010:task_wait_context kernel/locking/lockdep.c:238 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4875 [inline] RIP: 0010:__lock_acquire+0x76d/0x1a40 kernel/locking/lockdep.c:5187 Code: 08 0f b6 54 24 48 85 c0 44 8b 44 24 10 48 8b 4c 24 18 74 0e 8b 05 93 09 3d 0f 85 c0 0f 84 9b 08 00 00 90 31 f6 e9 aa fb ff ff 03 00 00 00 e9 6a fb ff ff 48 89 04 24 e9 a3 f9 ff ff 8b bd 84 RSP: 0018:ffffc90000a08ca8 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffff88801ea830e0 RCX: 0000000000000000 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000040 RBP: ffff88801ea82540 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000007 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888123eea000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fad1af80f88 CR3: 000000002886c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000001800 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 rcu_lock_acquire include/linux/rcupdate.h:300 [inline] rcu_read_lock include/linux/rcupdate.h:840 [inline] advance_sched+0x718/0xd20 net/sched/sch_taprio.c:992 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline] __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64 Code: 86 8d 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 59 12 00 fb f4 bc 48 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90000197e00 EFLAGS: 00000246 RAX: 000000000957a5f5 RBX: ffff88801ea82540 RCX: ffffffff8bb942d5 RDX: 0000000000000000 RSI: ffffffff8e1a3212 RDI: ffffffff8c400f80 RBP: ffffed1003d504a8 R08: 0000000000000001 R09: ffffed10170a678d R10: ffff8880b8533c6b R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 1ffff92000032fc4 R15: dffffc0000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline] default_idle+0x9/0x10 arch/x86/kernel/process.c:768 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x3a7/0x5b0 kernel/sched/idle.c:355 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:454 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x158 IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available