IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: 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=44749, q=261 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294971215-4294960713), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g44749 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:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7326 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: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 10563 Comm: syz.3.1325 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:preempt_count_add+0x8/0x190 kernel/sched/core.c:5972 Code: a0 00 e9 70 ff ff ff e9 d3 fe ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 <53> 49 bf 00 00 00 00 00 fc ff df 48 c7 c0 80 25 77 9a 48 c1 e8 03 RSP: 0018:ffffc90000007cf0 EFLAGS: 00000046 RAX: 000ffff88807a659 RBX: 0000000000000082 RCX: 000000000000be30 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffffff9a9c49f0 R08: ffffc90000007d47 R09: 0000000000000000 R10: ffffc90000007d38 R11: fffff52000000fa9 R12: 0000000000000001 R13: dffffc0000000000 R14: ffffffff9a9c49f8 R15: 0000000000000000 FS: 00007febf76956c0(0000) GS:ffff888124f63000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007febf7693fa8 CR3: 0000000033140000 CR4: 00000000003526f0 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:131 [inline] _raw_spin_lock_irqsave+0x24/0x60 kernel/locking/spinlock.c:166 debug_object_activate+0xb7/0x420 lib/debugobjects.c:873 debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline] debug_activate kernel/time/hrtimer.c:528 [inline] enqueue_hrtimer+0xa9/0x2c0 kernel/time/hrtimer.c:1109 __run_hrtimer kernel/time/hrtimer.c:2048 [inline] __hrtimer_run_queues+0x4ce/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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198 Code: f7 e8 2d 5c d3 f5 f7 c3 00 02 00 00 74 05 e8 f0 40 ff f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 74 72 c4 f5 65 8b 05 4d 53 9c 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc900055b6ee8 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000282 RCX: 0000000000000202 RDX: 0000000000000002 RSI: ffffffff8e22653c RDI: 0000000000000001 RBP: ffffc900055b71d0 R08: ffffffff905741f7 R09: 1ffffffff20ae83e R10: dffffc0000000000 R11: fffffbfff20ae83f R12: ffff88807a6592a8 R13: dffffc0000000000 R14: ffff88807a6592a8 R15: ffff88807a6592f8 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline] taprio_change+0x34f3/0x4640 net/sched/sch_taprio.c:1989 taprio_init+0x994/0xc00 net/sched/sch_taprio.c:2128 qdisc_create+0x7b5/0xf00 net/sched/sch_api.c:1323 __tc_modify_qdisc net/sched/sch_api.c:1757 [inline] tc_modify_qdisc+0x17af/0x2390 net/sched/sch_api.c:1821 rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7085 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775 __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2684 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2773 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: 0033:0x7febf679de59 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:00007febf7695028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007febf6a26090 RCX: 00007febf679de59 RDX: 0000000000000010 RSI: 00002000000012c0 RDI: 000000000000000d RBP: 00007febf6833e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007febf6a26128 R14: 00007febf6a26090 R15: 00007ffe052b6e88 IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available