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: Tasks blocked on level-0 rcu_node (CPUs 0-1): P27654/1:b..l rcu: (detected by 1, t=10502 jiffies, g=194577, q=165 ncpus=2) task:syz-executor state:R running task stack:27296 pid:27654 tgid:27654 ppid:24008 task_flags:0x400040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1821/0x5740 kernel/sched/core.c:7189 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7463 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13 rcu_is_watching+0x7f/0xb0 kernel/rcu/tree.c:753 rcu_read_lock include/linux/rcupdate.h:839 [inline] class_rcu_constructor include/linux/rcupdate.h:1181 [inline] is_module_text_address+0x4b/0x1e0 kernel/module/main.c:3921 kernel_text_address+0x94/0xe0 kernel/extable.c:119 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4570 [inline] slab_alloc_node mm/slub.c:4899 [inline] kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4918 __d_alloc+0x37/0x6f0 fs/dcache.c:1807 d_alloc_parallel+0xe6/0x1610 fs/dcache.c:2671 __lookup_slow+0x137/0x410 fs/namei.c:1900 lookup_slow+0x53/0x70 fs/namei.c:1932 walk_component fs/namei.c:2278 [inline] link_path_walk+0x1273/0x18d0 fs/namei.c:2649 path_openat+0x2c3/0x3860 fs/namei.c:4854 do_file_open+0x23e/0x4a0 fs/namei.c:4887 do_sys_openat2+0x113/0x200 fs/open.c:1364 do_sys_open fs/open.c:1370 [inline] __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1381 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: 0033:0x7f358d95d68e RSP: 002b:00007ffd4c4f5b08 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000555568951500 RCX: 00007f358d95d68e RDX: 0000000000080001 RSI: 00007f358da33d04 RDI: ffffffffffffff9c RBP: 00007f358da33d04 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00007ffd4c4f5be0 R14: 0000000000134195 R15: 00007ffd4c4f6150 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g194577 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=83531 rcu: rcu_preempt kthread starved for 10502 jiffies! g194577 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1821/0x5740 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0x164/0x360 kernel/sched/core.c:7283 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297 kthread+0x389/0x470 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: 27650 Comm: syz.2.6389 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:rb_erase+0xe42/0xe60 lib/rbtree.c:446 Code: 3c 20 00 48 8b 5c 24 18 74 19 48 89 df e8 06 71 8e f6 eb 0f 43 80 3c 26 00 74 08 48 89 df e8 f5 70 8e f6 4c 89 2b 48 83 c4 28 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 6a a4 6d f5 cc 66 66 66 66 66 2e RSP: 0018:ffffc90000007d10 EFLAGS: 00000092 RAX: 1ffff110170c50a3 RBX: ffff8880b8628518 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffff8880b8628518 RDI: ffff88807d714308 RBP: dffffc0000000000 R08: ffffffff9a694b6b R09: 1ffffffff34d296d R10: dffffc0000000000 R11: fffffbfff34d296e R12: ffff88807d714300 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 000055558f9fe500(0000) GS:ffff88812529c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3bd640 CR3: 0000000034307000 CR4: 0000000000350ef0 DR0: 0000000000000004 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rb_erase_linked+0x12d/0x190 lib/rbtree.c:459 timerqueue_linked_del include/linux/timerqueue.h:66 [inline] __remove_hrtimer+0xf7/0x3e0 kernel/time/hrtimer.c:1155 __run_hrtimer kernel/time/hrtimer.c:1910 [inline] __hrtimer_run_queues+0x299/0xa20 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 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 9d 48 f8 f5 f7 c3 00 02 00 00 74 05 e8 d0 e2 23 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 b4 c7 e9 f5 65 8b 05 ad 3e 8e 07 85 c0 74 18 5b 41 5e e9 7c 3f RSP: 0018:ffffc900001e7b20 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000287 RCX: 0000000080000002 RDX: 0000000000000000 RSI: ffffffff8dfa3f55 RDI: 0000000000000001 RBP: ffff888036ac9f00 R08: ffffffff903029f7 R09: 1ffffffff206053e R10: dffffc0000000000 R11: fffffbfff206053f R12: dffffc0000000000 R13: 1ffff110170e77a4 R14: ffff888036aca970 R15: ffff8880b873bd20 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline] try_to_wake_up+0x7b4/0x1380 kernel/sched/core.c:4190 wake_up_process kernel/sched/core.c:4434 [inline] wake_up_q+0x85/0xd0 kernel/sched/core.c:1158 futex_wake+0x49a/0x580 kernel/futex/waitwake.c:198 do_futex+0x395/0x420 kernel/futex/syscalls.c:135 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:188 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: 0033:0x7fd971f9ce59 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:00007ffd8b8e82b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd971f9ce59 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fd972215fa8 RBP: 0000000000001100 R08: 0000000000000000 R09: 0000000000000000 R10: 00007fd972215fa0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd972215fac R14: 00007fd972215fa8 R15: 00007fd972215fa0 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