IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=218377, q=565 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295118082-4295107580), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g218377 f0x2 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:28840 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 1864 Comm: syz.2.8789 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:mark_lock+0x3a/0xa20 kernel/locking/lockdep.c:4731 Code: 89 f4 53 48 83 e4 f0 48 83 ec 70 65 48 8b 1d e5 05 7e 12 48 89 5c 24 68 89 d3 83 fa 08 74 6d 41 be 01 00 00 00 89 d9 41 d3 e6 <4d> 63 f6 41 0f b7 44 24 20 66 25 ff 1f 0f b7 c0 48 0f a3 05 8e cf RSP: 0018:ffffc90000007ca0 EFLAGS: 00000093 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888083e1b108 RDI: ffff888083e1a540 RBP: ffffc90000007d38 R08: 0000000000000001 R09: 0000000000000002 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888083e1b108 R13: ffff888083e1a540 R14: 0000000000000001 R15: 0000000000000000 FS: 00007fd67f7f66c0(0000) GS:ffff888123dec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa7510087de CR3: 00000000715a9000 CR4: 00000000003526f0 Call Trace: mark_usage kernel/locking/lockdep.c:4639 [inline] __lock_acquire+0x10a8/0x1a40 kernel/locking/lockdep.c:5191 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:174 __run_hrtimer kernel/time/hrtimer.c:2036 [inline] __hrtimer_run_queues+0x1b7/0x9c0 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:rcu_lock_release include/linux/rcupdate.h:310 [inline] RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:871 [inline] RIP: 0010:class_rcu_destructor include/linux/rcupdate.h:1183 [inline] RIP: 0010:futex_hash+0x303/0x400 kernel/futex/core.c:263 Code: e3 32 e9 ff e9 1e fe ff ff e8 19 f8 0d 00 49 89 dd e8 a1 d9 bc 09 31 ff 89 c3 89 c6 e8 76 f2 0d 00 85 db 75 63 e8 fd f7 0d 00 <48> c7 c7 00 61 be 8e 48 8d 35 00 00 00 00 e8 7a 8d e9 ff e8 e5 ee RSP: 0018:ffffc90004b7fba0 EFLAGS: 00000287 RAX: 0000000000000041 RBX: 0000000000000001 RCX: ffffc9000e149000 RDX: 0000000000080000 RSI: ffffffff81fbd8a3 RDI: ffff888083e1a540 RBP: ffffc90004b7fc50 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888037d3a140 R13: ffff888037d3a000 R14: dffffc0000000000 R15: 0000000000000001 class_hbr_constructor kernel/futex/futex.h:257 [inline] futex_wake+0x1af/0x5e0 kernel/futex/waitwake.c:198 do_futex+0x2b2/0x440 kernel/futex/syscalls.c:138 __do_sys_futex kernel/futex/syscalls.c:210 [inline] __se_sys_futex kernel/futex/syscalls.c:191 [inline] __x64_sys_futex+0x34f/0x4d0 kernel/futex/syscalls.c:191 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd68159de59 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:00007fd67f7f60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fd681825fa8 RCX: 00007fd68159de59 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fd681825fac RBP: 00007fd681825fa0 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd681826038 R14: 00007ffd648bb890 R15: 00007ffd648bb978 IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available IPVS: wrr: UDP 224.0.0.2:0 - no destination available