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=85861, q=519 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295022003-4295011501), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g85861 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:28984 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: 16322 Comm: syz.5.2933 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:preempt_count_sub+0xc/0x160 kernel/sched/core.c:6004 Code: 1e fa 48 c7 c7 e0 9d 3a 94 e9 e0 83 71 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 c7 c0 00 76 43 9b 53 <89> fb 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03 RSP: 0018:ffffc90000007dc8 EFLAGS: 00000046 RAX: ffffffff9b437600 RBX: ffff8880570e32a8 RCX: ffffffff81e56593 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001 RBP: ffff888026acac00 R08: 0000000000000000 R09: ffffed100ae1c655 R10: ffff8880570e32ab R11: 0000000000000000 R12: 0000000000000000 R13: 18bd43539086d9a8 R14: ffff888026acb000 R15: ffff888026acb000 FS: 00007f188fe936c0(0000) GS:ffff8881240e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c26b293 CR3: 000000005ee10000 CR4: 00000000003526f0 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock+0x28/0x50 kernel/locking/spinlock.c:190 spin_unlock include/linux/spinlock.h:390 [inline] advance_sched+0x6a2/0xd20 net/sched/sch_taprio.c:988 __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:__sanitizer_cov_trace_pc+0x54/0x70 kernel/kcov.c:222 Code: e9 11 91 96 09 8b 82 24 17 00 00 85 c0 74 f1 8b 82 f8 16 00 00 83 f8 02 75 e6 48 8b 8a 00 17 00 00 8b 92 fc 16 00 00 48 8b 01 <48> 83 c0 01 48 39 d0 73 cd 48 89 01 48 89 34 c1 e9 d7 90 96 09 0f RSP: 0018:ffffc90004fdf9a0 EFLAGS: 00000246 RAX: 0000000000000194 RBX: ffff888079c24a80 RCX: ffffc9001c4c8000 RDX: 0000000000080000 RSI: ffffffff81fb86c3 RDI: ffffc90004fdfb88 RBP: ffffc90004fdfa58 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffed100f384c61 R13: ffffc90004fdfb88 R14: dffffc0000000000 R15: 0000000000000000 rcu_read_lock include/linux/rcupdate.h:838 [inline] class_rcu_constructor include/linux/rcupdate.h:1183 [inline] futex_hash+0x1a3/0x400 kernel/futex/core.c:263 class_hbr_constructor kernel/futex/futex.h:257 [inline] futex_wait_setup+0xd8/0x540 kernel/futex/waitwake.c:654 __futex_wait+0x19f/0x300 kernel/futex/waitwake.c:717 futex_wait+0xe6/0x370 kernel/futex/waitwake.c:750 do_futex+0x265/0x440 kernel/futex/syscalls.c:133 __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: 0033:0x7f188ef9ce59 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:00007f188fe930e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f188f215fa8 RCX: 00007f188ef9ce59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f188f215fa8 RBP: 00007f188f215fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f188f216038 R14: 00007ffcc66478e0 R15: 00007ffcc66479c8 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