IPVS: Schedule: port zero only supported in persistent services, check your ipvs configuration rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=126649, q=1500106 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 2289 (4295052812-4295050523), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 2290 jiffies! g126649 f0x2 RCU_GP_WAIT_FQS(5) ->state=R ->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:27456 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5583 [inline] __schedule+0x17dd/0x5830 kernel/sched/core.c:7382 __schedule_loop kernel/sched/core.c:7459 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7474 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122 rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330 kthread+0x38b/0x480 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: 26695 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 Workqueue: hci5 hci_cmd_sync_work RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:65 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:141 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline] RIP: 0010:kasan_check_range+0x67/0x2c0 mm/kasan/generic.c:200 Code: 00 ff 4c 39 cf 0f 82 14 02 00 00 49 89 ff 49 c1 ef 03 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 17 49 ff c8 4d 89 c1 49 c1 e9 03 <48> bb 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 RSP: 0018:ffffc90000007240 EFLAGS: 00000a02 RAX: ffff8880374df101 RBX: 0000000000000044 RCX: ffffffff89c476ae RDX: 0000000000000001 RSI: 0000000000000044 RDI: ffff8880374df1c0 RBP: 0000000000000000 R08: ffff8880374df203 R09: 1ffff11006e9be40 R10: dffffc0000000000 R11: ffffed1006e9be38 R12: 0000000000000168 R13: 00000000ffffffff R14: ffff8880374df1c0 R15: 1ffff11006e9be38 FS: 0000000000000000(0000) GS:ffff88812361f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf42aa7e3a CR3: 00000000657bc000 CR4: 00000000003526f0 Call Trace: __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 skbuff_clear net/core/skbuff.c:326 [inline] __alloc_skb+0x20e/0x7a0 net/core/skbuff.c:709 alloc_skb include/linux/skbuff.h:1390 [inline] synproxy_send_client_synack+0x175/0xde0 net/netfilter/nf_synproxy_core.c:463 nft_synproxy_eval_v4+0x362/0x4e0 net/netfilter/nft_synproxy.c:59 nft_synproxy_do_eval+0x389/0x5d0 net/netfilter/nft_synproxy.c:142 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline] nft_do_chain+0x48d/0x1b10 net/netfilter/nf_tables_core.c:285 nft_do_chain_inet+0x360/0x4b0 net/netfilter/nft_chain_filter.c:162 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:633 nf_hook include/linux/netfilter.h:280 [inline] NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:323 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325 __netif_receive_skb_one_core net/core/dev.c:6435 [inline] __netif_receive_skb net/core/dev.c:6548 [inline] process_backlog+0xa6b/0x18b0 net/core/dev.c:6899 __napi_poll+0xaa/0x330 net/core/dev.c:7968 napi_poll net/core/dev.c:8031 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:8188 handle_softirqs+0x265/0x8d0 kernel/softirq.c:669 __do_softirq kernel/softirq.c:703 [inline] invoke_softirq kernel/softirq.c:542 [inline] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 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:211 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221 Code: f7 e8 4d 56 9f f5 f7 c3 00 02 00 00 74 05 e8 50 f7 cb f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 64 4a 90 f5 65 48 8b 05 ac a1 ba 08 48 85 c0 74 18 5b 41 5e c3 RSP: 0018:ffffc90003b9f568 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000246 RCX: 8000000000000001 RDX: 0000000000000007 RSI: ffffffff8e6a2096 RDI: 0000000000000001 RBP: ffffc90003b9f608 R08: ffffffff919d72bf R09: 1ffffffff233ae57 R10: dffffc0000000000 R11: fffffbfff233ae58 R12: ffff88801e694d80 R13: 0000000000000000 R14: ffff88801e694d80 R15: ffff888140415c80 spin_unlock_irqrestore include/linux/spinlock.h:425 [inline] __slab_free+0x21d/0x2c0 mm/slub.c:-1 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x600 mm/slub.c:5680 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] kobject_uevent_env+0x289/0x9e0 lib/kobject_uevent.c:543 device_del+0x74d/0x8f0 drivers/base/core.c:3983 device_unregister+0x21/0xf0 drivers/base/core.c:4006 hci_conn_cleanup net/bluetooth/hci_conn.c:170 [inline] hci_conn_del+0xc98/0x1290 net/bluetooth/hci_conn.c:1362 hci_abort_conn_sync+0xda7/0x1170 net/bluetooth/hci_sync.c:6073 hci_cmd_sync_work+0x280/0x430 net/bluetooth/hci_sync.c:338 process_one_work kernel/workqueue.c:3495 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 kthread+0x38b/0x480 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