rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=7d84/1/0x4000000000000000 softirq=101915/101918 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P26529/1:b..l (detected by 1, t=10506 jiffies, g=138357, q=47 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4373 Comm: kworker/0:7 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: events drain_vmap_area_work RIP: 0010:native_apic_msr_eoi_write+0xb/0x10 arch/x86/include/asm/apic.h:212 Code: 8b 06 bf f0 03 00 00 89 de 5b 41 5e 41 5f ff e0 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b9 0b 08 00 00 31 c0 31 d2 0f 30 0f 1f 40 00 81 ff cf 00 00 00 7f 0c 83 ff 20 74 2a 83 ff 30 74 RSP: 0018:ffffc90000007fd0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffffff8c658b30 RCX: 000000000000080b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000b0 RBP: 0000000000000000 R08: ffffffff8fa14008 R09: ffffffff8fa14018 R10: ffffffff8fa14010 R11: ffffffff8fa14003 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f99667456b8 CR3: 000000004bd16000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: apic_eoi arch/x86/include/asm/apic.h:399 [inline] ack_APIC_irq arch/x86/include/asm/apic.h:445 [inline] __sysvec_irq_work+0x53/0x350 arch/x86/kernel/irq_work.c:19 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x98/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728 RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 82 30 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc90004727800 EFLAGS: 00000206 RAX: 0fb20e44cd3ee800 RBX: 1ffff920008e4f08 RCX: 0fb20e44cd3ee800 RDX: dffffc0000000000 RSI: ffffffff8a8c1aa0 RDI: ffffffff8adf2060 RBP: ffffc900047278e8 R08: ffffffff90aff247 R09: 1ffffffff215fe48 R10: dffffc0000000000 R11: fffffbfff215fe49 R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8e3b900 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] page_ext_put+0x91/0xb0 mm/page_ext.c:182 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508 kasan_depopulate_vmalloc_pte+0x67/0x80 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2660 [inline] apply_to_pmd_range mm/memory.c:2704 [inline] apply_to_pud_range mm/memory.c:2740 [inline] apply_to_p4d_range mm/memory.c:2776 [inline] __apply_to_page_range+0x989/0xd10 mm/memory.c:2812 kasan_release_vmalloc+0x93/0xb0 mm/kasan/shadow.c:492 __purge_vmap_area_lazy+0xf7e/0x1920 mm/vmalloc.c:1782 drain_vmap_area_work+0x3c/0xd0 mm/vmalloc.c:1811 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 task:syz.4.7125 state:R running task stack:25712 pid:26529 ppid:23325 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874 irqentry_exit+0x63/0x70 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:seqcount_lockdep_reader_access+0x196/0x1d0 include/linux/seqlock.h:105 Code: 00 4d 85 e4 75 16 e8 d9 c4 0f 00 eb 15 e8 d2 c4 0f 00 e8 8d 9f bc 08 4d 85 e4 74 ea e8 c3 c4 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 43 c7 44 3e 08 00 00 00 00 65 48 8b 04 25 RSP: 0018:ffffc9000ef278c0 EFLAGS: 00000246 RAX: ffffffff8172b6dd RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90012927000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000ef27970 R08: ffff8880b8f3580b R09: 1ffff110171e6b01 R10: dffffc0000000000 R11: ffffed10171e6b02 R12: 0000000000000200 R13: dffffc0000000000 R14: 1ffff92001de4f18 R15: dffffc0000000000 ktime_get_coarse_ts64+0x19/0xf0 kernel/time/timekeeping.c:2275 ktime_get_coarse include/linux/timekeeping.h:120 [inline] ktime_get_coarse_ns include/linux/timekeeping.h:126 [inline] ____bpf_ktime_get_coarse_ns kernel/bpf/helpers.c:197 [inline] bpf_ktime_get_coarse_ns+0x85/0x100 kernel/bpf/helpers.c:195 bpf_prog_45b414baf143fabe+0x42/0x46 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_test_run+0x2b6/0x830 net/bpf/test_run.c:402 bpf_prog_test_run_skb+0xd88/0x1890 net/bpf/test_run.c:1222 bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3695 __sys_bpf+0x62b/0x780 kernel/bpf/syscall.c:5049 __do_sys_bpf kernel/bpf/syscall.c:5135 [inline] __se_sys_bpf kernel/bpf/syscall.c:5133 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f312839ce59 RSP: 002b:00007f31292a5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f3128615fa0 RCX: 00007f312839ce59 RDX: 0000000000000050 RSI: 0000200000000080 RDI: 000000000000000a RBP: 00007f3128432d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3128616038 R14: 00007f3128615fa0 R15: 00007ffff2941758 rcu: rcu_preempt kthread starved for 10506 jiffies! g138357 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27504 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562 schedule+0xb9/0x180 kernel/sched/core.c:6638 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 22381 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:kvm_wait+0x159/0x1b0 arch/x86/kernel/kvm.c:1064 Code: 89 df 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 4b 0f b6 1f e8 47 42 50 00 44 38 e3 75 10 66 90 0f 00 2d 39 d7 50 09 fb f4 16 ff ff ff fb e9 10 ff ff ff e8 17 b3 f6 08 89 f9 80 e1 07 38 RSP: 0018:ffffc900032372a0 EFLAGS: 00000246 RAX: 02047f09127c9300 RBX: 0000000000000003 RCX: 02047f09127c9300 RDX: dffffc0000000000 RSI: ffffffff8a8c1aa0 RDI: ffffffff8adf2060 RBP: ffffc90003237350 R08: ffffffff90aff24f R09: 1ffffffff215fe49 R10: dffffc0000000000 R11: fffffbfff215fe4a R12: 0000000000000003 R13: ffff8880b8f3b954 R14: dffffc0000000000 R15: 1ffff92000646e54 FS: 0000555588725500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f94cd1e8158 CR3: 000000002e947000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: pv_wait arch/x86/include/asm/paravirt.h:603 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x616/0x9c0 kernel/locking/qspinlock.c:511 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x265/0x2f0 kernel/locking/spinlock_debug.c:115 spin_lock include/linux/spinlock.h:351 [inline] preload_this_cpu_lock mm/vmalloc.c:1588 [inline] alloc_vmap_area+0x251/0x18c0 mm/vmalloc.c:1630 __get_vm_area_node+0x158/0x330 mm/vmalloc.c:2513 __vmalloc_node_range+0x357/0x13b0 mm/vmalloc.c:3203 __vmalloc_node mm/vmalloc.c:3308 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3381 alloc_counters+0xcb/0x740 net/ipv4/netfilter/arp_tables.c:672 copy_entries_to_user net/ipv4/netfilter/arp_tables.c:693 [inline] get_entries net/ipv4/netfilter/arp_tables.c:879 [inline] do_arpt_get_ctl+0xa5d/0x1080 net/ipv4/netfilter/arp_tables.c:1473 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x19b/0x230 net/ipv4/ip_sockglue.c:1826 __sys_getsockopt+0x1b0/0x230 net/socket.c:2331 __do_sys_getsockopt net/socket.c:2346 [inline] __se_sys_getsockopt net/socket.c:2343 [inline] __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2343 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f94ccf9e62a Code: 48 83 ec 10 89 d2 48 63 ff 45 31 c9 6a 2a 45 31 c0 31 c9 e8 d8 99 fb ff 48 83 c4 18 c3 0f 1f 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7 RSP: 002b:00007ffe0df4b748 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f94ccf9e62a RDX: 0000000000000061 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007ffe0df4b7b0 R08: 00007ffe0df4b75c R09: 0000000000000000 R10: 00007ffe0df4b7b0 R11: 0000000000000212 R12: 00007ffe0df4b75c R13: 00007f94cd0337bd R14: 0000000000152bb4 R15: 00007ffe0df4bea0