IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1086/1:b..l rcu: (detected by 0, t=10506 jiffies, g=25757, q=290 ncpus=2) task:kworker/u4:6 state:R running task stack:24488 pid:1086 ppid:2 flags:0x00004000 Workqueue: bat_events batadv_nc_worker Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1553/0x45a0 kernel/sched/core.c:6700 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758 Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25 RSP: 0018:ffffc9000458fa40 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1cee07224fbafc00 RDX: 0000000000000000 RSI: ffffffff8acadd60 RDI: ffffffff8b1c9a20 RBP: ffffc9000458fb48 R08: dffffc0000000000 R09: 1ffffffff22398a0 R10: dffffc0000000000 R11: fffffbfff22398a1 R12: 1ffff920008b1f54 R13: ffffffff8d132120 R14: 0000000000000246 R15: dffffc0000000000 rcu_lock_acquire include/linux/rcupdate.h:334 [inline] rcu_read_lock include/linux/rcupdate.h:786 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0xef/0x610 net/batman-adv/network-coding.c:719 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g25757 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=13065 rcu: rcu_preempt kthread starved for 10506 jiffies! g25757 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 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:26960 pid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1553/0x45a0 kernel/sched/core.c:6700 schedule+0xbd/0x170 kernel/sched/core.c:6774 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168 rcu_gp_fqs_loop+0x313/0x1590 kernel/rcu/tree.c:1667 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5141 Comm: udevd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:__raw_spin_lock_irq include/linux/spinlock_api_smp.h:118 [inline] RIP: 0010:_raw_spin_lock_irq+0x8a/0xf0 kernel/locking/spinlock.c:170 Code: c6 44 3e 04 00 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 8b 44 24 20 43 c6 44 3e 04 f8 fa a9 00 02 00 00 74 05 e8 e6 db fb f6 01 00 00 00 e8 bc c8 ca f6 48 8d 7b 18 31 f6 31 d2 31 c9 41 b8 RSP: 0018:ffffc900001f0ca0 EFLAGS: 00000046 RAX: 0000000000000802 RBX: ffff8880b8f2b700 RCX: ffff88807e1bda00 RDX: 0000000000010000 RSI: ffffffff8b1c9a00 RDI: ffff8880b8f2b700 RBP: ffffc900001f0d30 R08: ffffffff8e8b502f R09: 1ffffffff1d16a05 R10: dffffc0000000000 R11: fffffbfff1d16a06 R12: ffff88807b21c340 R13: dffffc0000000000 R14: 1ffff9200003e194 R15: dffffc0000000000 FS: 00007f3229264880(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f316ad456b8 CR3: 000000007e2ae000 CR4: 00000000003506e0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1758 [inline] __hrtimer_run_queues+0x5e6/0xc40 kernel/time/hrtimer.c:1818 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1880 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline] __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:unwind_next_frame+0x0/0x2970 arch/x86/kernel/unwind_orc.c:469 Code: 56 f4 4b 00 eb b5 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 64 ff ff ff 48 89 df e8 6c 33 a4 00 e9 57 ff ff ff 0f 1f 80 00 00 00 00 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 81 ec 98 00 00 00 49 RSP: 0018:ffffc900031474a0 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc90003147560 RCX: ffff88807e1bda00 RDX: dffffc0000000000 RSI: ffffffff8aa000d0 RDI: ffffc900031474a8 RBP: ffffc90003147530 R08: ffffc90003147570 R09: 000000000000000c R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff8aa000d0 R13: 0000000000000058 R14: ffffffff8175c7b0 R15: ffffc900031474a8 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519 kmem_cache_zalloc include/linux/slab.h:711 [inline] lsm_file_alloc security/security.c:613 [inline] security_file_alloc+0x34/0x120 security/security.c:2604 init_file+0x94/0x1f0 fs/file_table.c:161 alloc_empty_file+0xb7/0x1d0 fs/file_table.c:210 path_openat+0x113/0x3230 fs/namei.c:3783 do_filp_open+0x1f5/0x430 fs/namei.c:3824 do_sys_openat2+0x134/0x1d0 fs/open.c:1421 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1447 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3228aa7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffcebf109f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f3229264880 RCX: 00007f3228aa7407 RDX: 00000000000a0800 RSI: 000055ee54e5e320 RDI: ffffffffffffff9c RBP: 0000000000000138 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 000055ee426d5100 R14: 0000000000000000 R15: 00007ffcebf10c80 IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available IPVS: ovf: UDP 224.0.0.1:0 - no destination available