IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=038c/0/0x1 softirq=163777/163777 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P21811/1:b..l rcu: (detected by 0, t=10502 jiffies, g=156489, q=368 ncpus=2) 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:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: c6 df 5e 00 48 89 df 5b e9 dd 5a 64 00 be 03 00 00 00 5b e9 52 39 13 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 8b 05 85 4f 59 12 48 8b 34 24 65 48 8b 15 61 4f 59 RSP: 0018:ffffc90000a08dd0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88801fb83000 RCX: ffffffff89c6c212 RDX: 1ffff11003f70641 RSI: ffffffff898a163d RDI: ffff88801fb83208 RBP: ffff888056576000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 18bedff78ea86368 R14: ffff888056576c00 R15: ffff888056576c00 FS: 0000000000000000(0000) GS:ffff888123eee000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000432d3000 CR4: 00000000003526f0 Call Trace: __netif_schedule+0x47/0x70 net/core/dev.c:3406 advance_sched+0x740/0xd20 net/sched/sch_taprio.c:993 __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: 16 8e 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 f9 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: 00000242 RAX: 00000000007339bf RBX: ffff88801ea82540 RCX: ffffffff8bb8a2d5 RDX: 0000000000000000 RSI: ffffffff8e1a25e5 RDI: ffffffff8c400c80 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 task:kworker/u8:40 state:R running task stack:24344 pid:21811 tgid:21811 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: krds_cp_wq#1/0 rds_connect_worker Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x125c/0x6730 kernel/sched/core.c:7234 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7556 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x205/0xa00 kernel/entry/common.c:167 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679 RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:56 [inline] RIP: 0010:stack_access_ok+0x76/0x1d0 arch/x86/kernel/unwind_orc.c:409 Code: c1 ea 03 80 3c 02 00 0f 85 24 01 00 00 48 8d 7b 10 4c 8b 6b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 0b 01 00 00 48 8b 43 10 49 39 ed 77 1a 48 39 e8 76 15 4a 8d RSP: 0018:ffffc90005dd74a0 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffc90005dd7540 RCX: ffffffff91d592a2 RDX: 1ffff92000bbaeaa RSI: ffffc90005dd79f0 RDI: ffffc90005dd7550 RBP: ffffc90005dd79f0 R08: 0000000000000001 R09: 0000000000000007 R10: 0000000000000200 R11: 0000000000019732 R12: 0000000000000008 R13: ffffc90005dd0000 R14: ffffc90005dd7a20 R15: ffffc90005dd7574 deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline] unwind_next_frame+0x1551/0x2090 arch/x86/kernel/unwind_orc.c:677 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556 __call_rcu_common.constprop.0+0xa5/0x9b0 kernel/rcu/tree.c:3159 destroy_inode+0x134/0x1c0 fs/inode.c:392 evict+0x599/0xad0 fs/inode.c:849 iput_final fs/inode.c:2019 [inline] iput.part.0+0x989/0x1050 fs/inode.c:2068 iput+0x35/0x40 fs/inode.c:2034 __sock_release net/socket.c:722 [inline] sock_release+0x169/0x1c0 net/socket.c:738 rds_tcp_conn_path_connect+0x7a0/0xaa0 net/rds/tcp_connect.c:220 rds_connect_worker+0x1b4/0x2d0 net/rds/threads.c:176 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 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: rcu_preempt kthread starved for 10502 jiffies! g156489 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: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: CPU: 0 UID: 0 PID: 21785 Comm: kworker/u8:4 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x5ad/0x16c0 kernel/smp.c:892 Code: b9 95 0c 00 f3 90 41 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 2c 0f 00 00 8b 45 08 31 ff 83 e0 01 41 89 c6 89 c6 e8 03 90 0c 00 <45> 85 f6 75 d0 e8 89 95 0c 00 e8 84 95 0c 00 83 c3 01 bf 07 00 00 RSP: 0018:ffffc9000f687878 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81fd3b0d RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88807ca32540 RBP: ffff8880b8541240 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed10170a8249 R14: 0000000000000001 R15: ffff8880b843c880 FS: 0000000000000000(0000) GS:ffff888123dee000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff078feb540 CR3: 000000000e992000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 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+0x337/0xc60 arch/x86/kernel/alternative.c:2983 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x37a/0x550 kernel/jump_label.c:910 static_key_enable_cpuslocked+0x1bc/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:911 [inline] toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:903 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 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 IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available IPVS: dh: UDP 224.0.0.2:0 - no destination available