rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P28212/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=282849, q=1513 ncpus=2)
task:syz.8.6942      state:R  running task     stack:26920 pid:28212 tgid:28212 ppid:26839  task_flags:0x40044c flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7270
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:deref_stack_reg+0x1ac/0x220 arch/x86/kernel/unwind_orc.c:422
Code: 30 4c 89 c7 49 89 f7 e8 12 07 00 00 49 89 c6 48 8b 5c 24 08 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 84 78 bf 00 <4c> 89 33 b0 01 eb 02 31 c0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc900047ef2c0 EFLAGS: 00000246
RAX: 1ffff920008fde89 RBX: ffffc900047ef448 RCX: 0000000000000001
RDX: ffffc900047ef448 RSI: dffffc0000000000 RDI: ffffc900047ef3f8
RBP: ffffc900047e8000 R08: ffffc900047ef3f8 R09: 0000000000000000
R10: ffffc900047ef458 R11: fffff520008fde8d R12: 1ffff920008fde82
R13: 1ffff920008fde83 R14: ffffc900047ef490 R15: dffffc0000000000
 unwind_next_frame+0x19bd/0x2550 arch/x86/kernel/unwind_orc.c:-1
 __unwind_start+0x514/0x660 arch/x86/kernel/unwind_orc.c:787
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 save_stack+0x122/0x230 mm/page_owner.c:183
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:338
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 __slab_free+0x274/0x2c0 mm/slub.c:5815
 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:406
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x321/0x600 mm/slub.c:5563
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 kvm_uevent_notify_change+0xc6/0x3a0 virt/kvm/kvm_main.c:6327
 kvm_destroy_vm virt/kvm/kvm_main.c:1261 [inline]
 kvm_put_kvm+0xa9/0xb50 virt/kvm/kvm_main.c:1332
 kvm_vm_release+0x43/0x50 virt/kvm/kvm_main.c:1355
 __fput+0x418/0xa50 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x73a/0x2360 kernel/exit.c:1008
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1151
 get_signal+0x121b/0x12c0 kernel/signal.c:3039
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: eccb:0xe4a421182f13d611
RSP: 002b:00007f24dcb08f58 EFLAGS: 00000756 ORIG_RAX: 0000000000000000
RAX: 000000000000fec7 RBX: 000000001e2245c9 RCX: 0000000000000000
RDX: 0000000019000059 RSI: 00000000a5f487cb RDI: 0000000000000080
RBP: 0000000000002000 R08: dbce39d105fdbf88 R09: ae9ea378b9c9fbc7
R10: 33740f3b8630618c R11: 2450ade207355af5 R12: 0a61688f027fb1a4
R13: 339c71c774e61334 R14: 28baed4a0483d193 R15: 7c1f9cf2b758efdc
 </TASK>
rcu: rcu_preempt kthread starved for 568 jiffies! g282849 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:28112 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7270
 __schedule_loop kernel/sched/core.c:7347 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7362
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 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
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1126 Comm: kworker/u8:9 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker
RIP: 0010:get_entry net/ipv4/netfilter/ip_tables.c:-1 [inline]
RIP: 0010:ipt_do_table+0x3f9/0x15d0 net/ipv4/netfilter/ip_tables.c:275
Code: 89 f1 45 8b 74 96 0c 4d 01 ee 48 8b 84 24 a8 00 00 00 48 83 c0 08 48 89 84 24 18 01 00 00 48 8b 84 24 a0 00 00 00 48 83 c0 08 <48> 89 84 24 10 01 00 00 48 8b 44 24 40 48 8d 70 70 48 89 74 24 78
RSP: 0018:ffffc90000a188e0 EFLAGS: 00000282
RAX: ffffffff8d3108a8 RBX: ffff8880351a380c RCX: ffff8880351a3800
RDX: 0000000000000000 RSI: 0000000000000100 RDI: ffff8880351a380c
RBP: ffffc90000a18ac0 R08: 0000000000000100 R09: 0000000000000000
R10: ffffc90000a18a20 R11: fffff52000143148 R12: ffff8881c93d7540
R13: ffff8880351a3840 R14: ffff8880351a3840 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888124dd8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000002c2030 CR3: 0000000022ffa000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:280 [inline]
 NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:323
 __netif_receive_skb_one_core net/core/dev.c:6264 [inline]
 __netif_receive_skb net/core/dev.c:6377 [inline]
 process_backlog+0xa6b/0x18b0 net/core/dev.c:6728
 __napi_poll+0xaa/0x330 net/core/dev.c:7787
 napi_poll net/core/dev.c:7850 [inline]
 net_rx_action+0x61d/0xf50 net/core/dev.c:8007
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 do_softirq+0x77/0xd0 kernel/softirq.c:546
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
 blake2s_compress+0xfa/0x1c00 lib/crypto/x86/blake2s.h:42
 blake2s_update+0x140/0x450 lib/crypto/blake2s.c:119
 hmac+0x1f4/0x3b0 drivers/net/wireguard/noise.c:324
 kdf drivers/net/wireguard/noise.c:367 [inline]
 message_ephemeral+0x255/0x310 drivers/net/wireguard/noise.c:493
 wg_noise_handshake_create_initiation+0x24f/0x810 drivers/net/wireguard/noise.c:545
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:34 [inline]
 wg_packet_handshake_send_worker+0x18c/0x370 drivers/net/wireguard/send.c:51
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 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
 </TASK>