rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P71/1:b..l.. P1130/1:b..l.. P12249/1:b..l.. P10963/1:b..l.. P3942/1:b..l.. P29/8:b..l.. P48/4:b..l.. P5609/1:b..l..
rcu: 	(detected by 1, t=10502 jiffies, g=84013, q=646 ncpus=2)
task:kworker/1:5     state:R  running task     stack:20784 pid:5609  tgid:5609  ppid:2      task_flags:0x4208160 flags:0x00080000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7561
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 rt_mutex_wake_up_q kernel/locking/rtmutex.c:583 [inline]
 rt_mutex_slowunlock+0x6d3/0xa30 kernel/locking/rtmutex.c:1483
 rt_spin_unlock+0x10f/0x200 kernel/locking/spinlock_rt.c:84
 spin_unlock_irqrestore include/linux/spinlock_rt.h:141 [inline]
 __slab_free+0x228/0x2c0 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_slab_alloc+0x22/0x80 mm/kasan/common.c:361
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4720 [inline]
 slab_alloc_node mm/slub.c:5033 [inline]
 __kmalloc_cache_noprof+0x34e/0x670 mm/slub.c:5676
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 usb_control_msg+0x73/0x3e0 drivers/usb/core/message.c:157
 get_port_status drivers/usb/core/hub.c:610 [inline]
 hub_ext_port_status+0x112/0x840 drivers/usb/core/hub.c:627
 usb_hub_port_status drivers/usb/core/hub.c:677 [inline]
 port_event drivers/usb/core/hub.c:5779 [inline]
 hub_event+0x76e/0x4cf0 drivers/usb/core/hub.c:5971
 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/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
 </TASK>
task:kworker/u8:2    state:R  running task     stack:21240 pid:48    tgid:48    ppid:2      task_flags:0x4208160 flags:0x00080000
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
 irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:rcu_read_lock_held+0x0/0x50 kernel/rcu/update.c:346
Code: 05 05 f6 29 0f e9 40 e9 c7 09 cc 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 53 e8 46 0b c4 09 85 c0 74 26 31 db e8 5b 18 01 00 84
RSP: 0018:ffffc90000ba6f98 EFLAGS: 00000202
RAX: ffffffff89c392d9 RBX: 0000000000000001 RCX: ffff888020acbe80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000ba70d0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90000ba71b0 R11: fffff52000174e38 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff8880605ea000 R15: ffffc90000ba7190
 __ip_vs_conn_in_get+0x182/0x10f0 net/netfilter/ipvs/ip_vs_conn.c:380
 ip_vs_conn_in_get net/netfilter/ipvs/ip_vs_conn.c:417 [inline]
 ip_vs_conn_in_get_proto+0x2ae/0x590 net/netfilter/ipvs/ip_vs_conn.c:470
 ip_vs_in_hook+0x63f/0x1cd0 net/netfilter/ipvs/ip_vs_core.c:2185
 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:633
 nf_hook+0x22a/0x3a0 include/linux/netfilter.h:280
 __ip_local_out+0x558/0x6a0 net/ipv4/ip_output.c:120
 ip_local_out+0x2a/0x190 net/ipv4/ip_output.c:129
 iptunnel_xmit+0x61b/0xd70 net/ipv4/ip_tunnel_core.c:97
 udp_tunnel_xmit_skb+0x29b/0x3e0 net/ipv4/udp_tunnel_core.c:187
 send4+0xa47/0xec0 drivers/net/wireguard/socket.c:85
 wg_socket_send_skb_to_peer+0xe8/0x200 drivers/net/wireguard/socket.c:174
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x204/0x370 drivers/net/wireguard/send.c:51
 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/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
 </TASK>
task:ksoftirqd/1     state:R  running task     stack:21032 pid:29    tgid:29    ppid:2      task_flags:0x4208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7561
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 rt_mutex_wake_up_q kernel/locking/rtmutex.c:583 [inline]
 rt_mutex_slowunlock+0x6d3/0xa30 kernel/locking/rtmutex.c:1483
 rwbase_rtmutex_unlock kernel/locking/spinlock_rt.c:194 [inline]
 __rwbase_write_unlock kernel/locking/rwbase_rt.c:201 [inline]
 rwbase_write_unlock kernel/locking/rwbase_rt.c:212 [inline]
 rt_write_unlock+0x154/0x360 kernel/locking/spinlock_rt.c:293
 write_unlock include/linux/rwlock_rt.h:138 [inline]
 __neigh_event_send+0xa1/0x14a0 net/core/neighbour.c:1278
 neigh_event_send_probe include/net/neighbour.h:474 [inline]
 neigh_event_send include/net/neighbour.h:480 [inline]
 neigh_resolve_output+0x1a0/0x740 net/core/neighbour.c:1618
 neigh_output include/net/neighbour.h:554 [inline]
 ip_finish_output2+0xc98/0x1100 net/ipv4/ip_output.c:236
 NF_HOOK_COND include/linux/netfilter.h:314 [inline]
 ip_output+0x29f/0x450 net/ipv4/ip_output.c:437
 __ip_queue_xmit+0x10df/0x1b10 net/ipv4/ip_output.c:533
 __tcp_transmit_skb+0x2d06/0x47b0 net/ipv4/tcp_output.c:1773
 tcp_rcv_established+0x1ab1/0x2910 net/ipv4/tcp_input.c:6702
 tcp_v4_do_rcv+0x959/0x13f0 net/ipv4/tcp_ipv4.c:1857
 tcp_v4_rcv+0x27d4/0x3170 net/ipv4/tcp_ipv4.c:2251
 ip_protocol_deliver_rcu+0x21d/0x440 net/ipv4/ip_input.c:207
 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241
 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325
 dst_input include/net/dst.h:482 [inline]
 ip_sublist_rcv_finish+0x1f0/0x240 net/ipv4/ip_input.c:623
 ip_list_rcv_finish net/ipv4/ip_input.c:675 [inline]
 ip_sublist_rcv+0x767/0xa70 net/ipv4/ip_input.c:683
 ip_list_rcv+0x3ec/0x440 net/ipv4/ip_input.c:717
 __netif_receive_skb_list_ptype net/core/dev.c:6449 [inline]
 __netif_receive_skb_list_core+0x57c/0x830 net/core/dev.c:6485
 __netif_receive_skb_list net/core/dev.c:6547 [inline]
 netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6638
 gro_normal_list include/net/gro.h:523 [inline]
 gro_normal_one include/net/gro.h:543 [inline]
 gro_skb_finish net/core/gro.c:621 [inline]
 gro_receive_skb+0x579/0xb50 net/core/gro.c:651
 receive_buf+0xfa6/0x1b60 drivers/net/virtio_net.c:2611
 virtnet_receive_packets drivers/net/virtio_net.c:2921 [inline]
 virtnet_receive drivers/net/virtio_net.c:2945 [inline]
 virtnet_poll+0x22ae/0x30f0 drivers/net/virtio_net.c:3040
 __napi_poll+0xae/0x550 net/core/dev.c:7938
 napi_poll net/core/dev.c:8001 [inline]
 net_rx_action+0x621/0xd70 net/core/dev.c:8158
 handle_softirqs+0x1d4/0x6c0 kernel/softirq.c:669
 run_ksoftirqd+0x53/0x190 kernel/softirq.c:1133
 smpboot_thread_fn+0x5f8/0xb30 kernel/smpboot.c:162
 kthread+0x38b/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
 </TASK>
task:kworker/u8:11   state:D stack:19456 pid:3942  tgid:3942  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule_rtlock+0x30/0x70 kernel/sched/core.c:7538
 rtlock_slowlock_locked+0x35c9/0x3c20 kernel/locking/rtmutex.c:1895
 rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 get_partial_node_bulk mm/slub.c:3868 [inline]
 __refill_objects_node+0x89/0x580 mm/slub.c:7400
 refill_objects+0x56/0x350 mm/slub.c:7526
 refill_sheaf mm/slub.c:2917 [inline]
 __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4811
 alloc_from_pcs mm/slub.c:4887 [inline]
 slab_alloc_node mm/slub.c:5021 [inline]
 __do_kmalloc_node mm/slub.c:5530 [inline]
 __kmalloc_node_track_caller_noprof+0x619/0x7b0 mm/slub.c:5662
 kmalloc_reserve net/core/skbuff.c:638 [inline]
 __alloc_skb+0x2c1/0x7a0 net/core/skbuff.c:716
 alloc_skb include/linux/skbuff.h:1390 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:744 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:801 [inline]
 nsim_dev_trap_report_work+0x2b1/0xca0 drivers/net/netdevsim/dev.c:847
 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/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
 </TASK>
task:kworker/u8:16   state:D stack:23832 pid:10963 tgid:10963 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule_rtlock+0x30/0x70 kernel/sched/core.c:7538
 rtlock_slowlock_locked+0x35c9/0x3c20 kernel/locking/rtmutex.c:1895
 rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 get_partial_node_bulk mm/slub.c:3868 [inline]
 __refill_objects_node+0x89/0x580 mm/slub.c:7400
 refill_objects+0x56/0x350 mm/slub.c:7526
 refill_sheaf mm/slub.c:2917 [inline]
 __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4811
 alloc_from_pcs mm/slub.c:4887 [inline]
 slab_alloc_node mm/slub.c:5021 [inline]
 __do_kmalloc_node mm/slub.c:5530 [inline]
 __kmalloc_node_track_caller_noprof+0x619/0x7b0 mm/slub.c:5662
 kmalloc_reserve net/core/skbuff.c:638 [inline]
 __alloc_skb+0x2c1/0x7a0 net/core/skbuff.c:716
 alloc_skb include/linux/skbuff.h:1390 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:744 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:801 [inline]
 nsim_dev_trap_report_work+0x2b1/0xca0 drivers/net/netdevsim/dev.c:847
 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/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
 </TASK>
task:kworker/u8:17   state:D stack:23176 pid:12249 tgid:12249 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule_rtlock+0x30/0x70 kernel/sched/core.c:7538
 rtlock_slowlock_locked+0x35c9/0x3c20 kernel/locking/rtmutex.c:1895
 rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 get_partial_node_bulk mm/slub.c:3868 [inline]
 __refill_objects_node+0x89/0x580 mm/slub.c:7400
 refill_objects+0x56/0x350 mm/slub.c:7526
 refill_sheaf mm/slub.c:2917 [inline]
 __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4811
 alloc_from_pcs mm/slub.c:4887 [inline]
 slab_alloc_node mm/slub.c:5021 [inline]
 __do_kmalloc_node mm/slub.c:5530 [inline]
 __kmalloc_node_track_caller_noprof+0x619/0x7b0 mm/slub.c:5662
 kmalloc_reserve net/core/skbuff.c:638 [inline]
 __alloc_skb+0x2c1/0x7a0 net/core/skbuff.c:716
 alloc_skb include/linux/skbuff.h:1390 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:744 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:801 [inline]
 nsim_dev_trap_report_work+0x2b1/0xca0 drivers/net/netdevsim/dev.c:847
 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/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
 </TASK>
task:kworker/u8:9    state:D stack:21384 pid:1130  tgid:1130  ppid:2      task_flags:0x4208160 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule_rtlock+0x30/0x70 kernel/sched/core.c:7538
 rtlock_slowlock_locked+0x35c9/0x3c20 kernel/locking/rtmutex.c:1895
 rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 get_partial_node_bulk mm/slub.c:3868 [inline]
 __refill_objects_node+0x89/0x580 mm/slub.c:7400
 refill_objects+0x56/0x350 mm/slub.c:7526
 refill_sheaf mm/slub.c:2917 [inline]
 __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4811
 alloc_from_pcs mm/slub.c:4887 [inline]
 slab_alloc_node mm/slub.c:5021 [inline]
 __do_kmalloc_node mm/slub.c:5530 [inline]
 __kmalloc_node_track_caller_noprof+0x619/0x7b0 mm/slub.c:5662
 kmalloc_reserve net/core/skbuff.c:638 [inline]
 __alloc_skb+0x2c1/0x7a0 net/core/skbuff.c:716
 alloc_skb include/linux/skbuff.h:1390 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:744 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:801 [inline]
 nsim_dev_trap_report_work+0x2b1/0xca0 drivers/net/netdevsim/dev.c:847
 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/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
 </TASK>
task:kworker/u8:4    state:D stack:19752 pid:71    tgid:71    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule_rtlock+0x30/0x70 kernel/sched/core.c:7538
 rtlock_slowlock_locked+0x35c9/0x3c20 kernel/locking/rtmutex.c:1895
 rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 get_partial_node_bulk mm/slub.c:3868 [inline]
 __refill_objects_node+0x89/0x580 mm/slub.c:7400
 refill_objects+0x56/0x350 mm/slub.c:7526
 refill_sheaf mm/slub.c:2917 [inline]
 __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4811
 alloc_from_pcs mm/slub.c:4887 [inline]
 slab_alloc_node mm/slub.c:5021 [inline]
 __do_kmalloc_node mm/slub.c:5530 [inline]
 __kmalloc_node_track_caller_noprof+0x619/0x7b0 mm/slub.c:5662
 kmalloc_reserve net/core/skbuff.c:638 [inline]
 __alloc_skb+0x2c1/0x7a0 net/core/skbuff.c:716
 alloc_skb include/linux/skbuff.h:1390 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:744 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:801 [inline]
 nsim_dev_trap_report_work+0x2b1/0xca0 drivers/net/netdevsim/dev.c:847
 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/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
 </TASK>
task:kworker/u8:7    state:D stack:20504 pid:170   tgid:170   ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule_rtlock+0x30/0x70 kernel/sched/core.c:7538
 rtlock_slowlock_locked+0x35c9/0x3c20 kernel/locking/rtmutex.c:1895
 rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 get_partial_node_bulk mm/slub.c:3868 [inline]
 __refill_objects_node+0x89/0x580 mm/slub.c:7400
 refill_objects+0x56/0x350 mm/slub.c:7526
 refill_sheaf mm/slub.c:2917 [inline]
 __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4811
 alloc_from_pcs mm/slub.c:4887 [inline]
 slab_alloc_node mm/slub.c:5021 [inline]
 __do_kmalloc_node mm/slub.c:5530 [inline]
 __kmalloc_node_track_caller_noprof+0x619/0x7b0 mm/slub.c:5662
 kmalloc_reserve net/core/skbuff.c:638 [inline]
 __alloc_skb+0x2c1/0x7a0 net/core/skbuff.c:716
 alloc_skb include/linux/skbuff.h:1390 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:744 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:801 [inline]
 nsim_dev_trap_report_work+0x2b1/0xca0 drivers/net/netdevsim/dev.c:847
 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/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
 </TASK>
rcu: rcu_preempt kthread starved for 9613 jiffies! g84013 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:27784 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 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/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
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L       syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: db 6b 02 e9 c3 e7 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 94 1a 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900001c7e40 EFLAGS: 00000242
RAX: 0000000000949849 RBX: ffffffff819b5a5c RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8daf05da RDI: ffffffff8bece580
RBP: ffffc900001c7f10 R08: ffff8880b85341db R09: 1ffff110170a683b
R10: dffffc0000000000 R11: ffffed10170a683c R12: 0000000000000000
R13: 1ffff11003bde3e8 R14: 1ffff92000038fd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888124835000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000e19000 CR3: 0000000042a30000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:767 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:768
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x1cc/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x157
 </TASK>