rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P991/3:b..l P3379/2:b..l P31/1:b..l P5825/2:b..l P1511/2:b..l P6749/4:b..l P993/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=28105, q=1506 ncpus=2)
task:kworker/u8:8    state:R  running task     stack:21216 pid:993   tgid:993   ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:eth_random_addr include/linux/etherdevice.h:240 [inline]
RIP: 0010:nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:827 [inline]
RIP: 0010:nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline]
RIP: 0010:nsim_dev_trap_report_work+0x3cc/0xcb0 drivers/net/netdevsim/dev.c:922
Code: 03 4c 8d 73 06 be 06 00 00 00 4c 89 f7 e8 5c 57 96 fe 4c 89 f0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 4b 05 00 00 0f b6 43 06 <24> fc 0c 02 88 43 06 4c 8d 73 0c 4c 89 f0 48 c1 e8 03 42 0f b6 04
RSP: 0018:ffffc90005ff7a40 EFLAGS: 00000246
RAX: 000000000000000a RBX: ffff8880257d8000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90005ff7960
RBP: ffff88803cfb6780 R08: ffffc90005ff795f R09: 0000000000000000
R10: ffffc90005ff7920 R11: fffff52000bfef2c R12: 0000000000000068
R13: dffffc0000000000 R14: ffff8880257d8006 R15: 00000000fffffffa
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 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:syz-executor    state:R  running task     stack:21784 pid:6749  tgid:6749  ppid:6732   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2c/0x80 kernel/kcov.c:217
Code: 1e fa 48 8b 04 24 65 48 8b 0d 48 44 d8 10 65 8b 35 69 44 d8 10 81 e6 00 00 ff 00 ba 00 01 00 00 23 91 f4 0b 00 00 89 d7 09 f7 <74> 11 85 f6 75 39 85 d2 74 35 83 b9 0c 17 00 00 00 74 2c 8b 91 e0
RSP: 0000:ffffc90007147338 EFLAGS: 00000246
RAX: ffffffff8217d846 RBX: 00007f9749806000 RCX: ffff8880362e5d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900071475f0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1003b0e4a2 R12: ffff888025f30030
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff88804bf8b030
 copy_pte_range mm/memory.c:1341 [inline]
 copy_pmd_range+0x1846/0x53e0 mm/memory.c:1408
 copy_pud_range mm/memory.c:1445 [inline]
 copy_p4d_range mm/memory.c:1469 [inline]
 copy_page_range+0xb34/0x1160 mm/memory.c:1555
 dup_mmap+0xf2d/0x1d40 mm/mmap.c:1840
 dup_mm kernel/fork.c:1543 [inline]
 copy_mm+0x11a/0x480 kernel/fork.c:1595
 copy_process+0x1e46/0x4390 kernel/fork.c:2289
 kernel_clone+0x2d2/0x8d0 kernel/fork.c:2748
 __do_sys_clone kernel/fork.c:2889 [inline]
 __se_sys_clone kernel/fork.c:2873 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2873
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f974a6f6a92
RSP: 002b:00007ffea05a9ec0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffea05a9ec0 RCX: 00007f974a6f6a92
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffea05aa04c R08: 0000000000000000 R09: 0000000000000001
R10: 0000555592c417d0 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000038 R14: 00000000000774ac R15: 00007ffea05aa0a0
 </TASK>
task:kworker/u8:11   state:R  running task     stack:20304 pid:1511  tgid:1511  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:preempt_schedule_thunk+0x22/0x40 arch/x86/entry/thunk.S:12
Code: 90 90 90 90 90 90 90 90 55 48 89 e5 57 56 52 51 50 41 50 41 51 41 52 41 53 e8 ba 27 12 0a 41 5b 41 5a 41 59 41 58 58 59 5a 5e <5f> 5d c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90007047748 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88801d2b3e00 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8bca7820
RBP: ffffc90007047750 R08: ffff88801d2b3e2b R09: 1ffff11003a567c5
R10: dffffc0000000000 R11: ffffed1003a567c6 R12: dffffc0000000000
R13: 1ffff92000e08ef4 R14: ffff88801d2b3e28 R15: ffffc900070477c0
 rt_mutex_wake_up_q kernel/locking/rtmutex.c:583 [inline]
 rt_mutex_slowunlock+0x6d1/0xa20 kernel/locking/rtmutex.c:1483
 rt_spin_unlock+0x10d/0x200 kernel/locking/spinlock_rt.c:84
 spin_unlock include/linux/spinlock_rt.h:109 [inline]
 crng_make_state+0x22f/0x5d0 drivers/char/random.c:383
 _get_random_bytes+0xff/0x260 drivers/char/random.c:396
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:846 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline]
 nsim_dev_trap_report_work+0x702/0xcb0 drivers/net/netdevsim/dev.c:922
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 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/u8:18   state:R  running task     stack:20440 pid:5825  tgid:5825  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x48e/0x2550 arch/x86/kernel/unwind_orc.c:520
Code: d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 b4 19 00 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 bf 19 00 00 0f b6 43 01 <83> e0 07 0f 84 7c 16 00 00 83 f8 01 4c 8b 6c 24 50 49 bc 00 00 00
RSP: 0000:ffffc90005aef580 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff903a25da RCX: ffffffff8fc41c2c
RDX: ffffffff903a25d6 RSI: ffffffff903a25d6 RDI: ffffffff8bca7820
RBP: ffffffff8132b019 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e1c3000 R12: dffffc0000000000
R13: ffffffff903a25db R14: ffffc90005aef628 R15: ffffffff8fc41c2c
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2677 [inline]
 slab_free mm/slub.c:6377 [inline]
 kmem_cache_free+0x187/0x6c0 mm/slub.c:6504
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:892 [inline]
 nsim_dev_trap_report_work+0x879/0xcb0 drivers/net/netdevsim/dev.c:922
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 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/1:0     state:R  running task     stack:19968 pid:31    tgid:31    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:preempt_schedule_thunk+0x18/0x40 arch/x86/entry/thunk.S:12
Code: cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 57 56 52 51 50 41 50 41 51 41 52 41 53 e8 ba 27 12 0a 41 5b <41> 5a 41 59 41 58 58 59 5a 5e 5f 5d c3 cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000a5f268 EFLAGS: 00000246
RAX: 1ffff11003a56000 RBX: ffff88813ffb1400 RCX: 0000000080000002
RDX: 0000000000000000 RSI: ffffffff8bca7860 RDI: ffffffff8bca7820
RBP: ffffc90000a5f2a8 R08: ffffffff8fafa337 R09: 1ffffffff1f5f466
R10: dffffc0000000000 R11: fffffbfff1f5f467 R12: 1ffff11003a56098
R13: ffff88801d2b0000 R14: ffff8880b873c750 R15: dffffc0000000000
 class_preempt_destructor include/linux/preempt.h:468 [inline]
 __migrate_enable include/linux/sched.h:2465 [inline]
 migrate_enable include/linux/sched.h:2505 [inline]
 rt_spin_unlock+0xf0/0x200 kernel/locking/spinlock_rt.c:81
 __refill_objects_node+0x534/0x5b0 mm/slub.c:-1
 refill_objects+0x56/0x350 mm/slub.c:7297
 refill_sheaf mm/slub.c:2804 [inline]
 __pcs_replace_empty_main+0x330/0x690 mm/slub.c:4675
 alloc_from_pcs mm/slub.c:4773 [inline]
 slab_alloc_node mm/slub.c:4905 [inline]
 __kmalloc_cache_noprof+0x468/0x6b0 mm/slub.c:5485
 _kmalloc_noprof include/linux/slab.h:988 [inline]
 usb_control_msg+0x73/0x3e0 drivers/usb/core/message.c:157
 get_port_status drivers/usb/core/hub.c:607 [inline]
 hub_ext_port_status+0x114/0x810 drivers/usb/core/hub.c:624
 hub_port_wait_reset drivers/usb/core/hub.c:-1 [inline]
 hub_port_reset+0x73f/0x1800 drivers/usb/core/hub.c:3093
 hub_port_init+0x2a1/0x28b0 drivers/usb/core/hub.c:4939
 hub_port_connect drivers/usb/core/hub.c:5496 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x24e2/0x4cf0 drivers/usb/core/hub.c:5953
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 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/u8:14   state:R  running task     stack:23200 pid:3379  tgid:3379  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_release+0x2d7/0x3c0 kernel/locking/lockdep.c:5893
Code: cb fc 10 00 00 00 00 eb b5 e8 65 6a a2 09 f7 c3 00 02 00 00 74 b9 65 48 8b 05 35 85 fc 10 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 5a 35 a6 09 cc 48 8d 3d d2 68 11
RSP: 0018:ffffc9000fb670c8 EFLAGS: 00000282
RAX: 5aa28e156c9e9500 RBX: 0000000000000202 RCX: 0000000000000046
RDX: 0000000000000007 RSI: ffffffff8daf6ba4 RDI: ffffffff8bca7880
RBP: ffff88803309ac20 R08: ffffc9000fb675f8 R09: 0000000000000000
R10: ffffc9000fb671f8 R11: fffff52001f6ce41 R12: 0000000000000007
R13: 0000000000000007 R14: ffffffff8e1c3000 R15: ffff888033099f00
 rcu_lock_release include/linux/rcupdate.h:310 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1183 [inline]
 unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 __call_rcu_common kernel/rcu/tree.c:3159 [inline]
 call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3279
 dentry_kill+0x4d3/0x880 fs/dcache.c:845
 finish_dput+0x1a/0x260 fs/dcache.c:1001
 debugfs_remove+0x5b/0x70 fs/debugfs/inode.c:781
 nsim_destroy+0x8e/0x800 drivers/net/netdevsim/netdev.c:1180
 __nsim_dev_port_del+0x14e/0x200 drivers/net/netdevsim/dev.c:1547
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1561 [inline]
 nsim_dev_reload_destroy+0x288/0x490 drivers/net/netdevsim/dev.c:1785
 nsim_dev_reload_down+0x8a/0xc0 drivers/net/netdevsim/dev.c:1038
 devlink_reload+0x1c5/0x890 net/devlink/dev.c:462
 devlink_pernet_pre_exit+0x1ff/0x420 net/devlink/core.c:560
 ops_pre_exit_list net/core/net_namespace.c:161 [inline]
 ops_undo_list+0x17d/0x8d0 net/core/net_namespace.c:234
 cleanup_net+0x575/0x810 net/core/net_namespace.c:702
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 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:S stack:20408 pid:991   tgid:991   ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound call_usermodehelper_exec_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:task_pid_ptr kernel/pid.c:384 [inline]
RIP: 0010:__change_pid+0xb8/0x3d0 kernel/pid.c:408
Code: ed 74 6d 49 8d 9c 24 b0 09 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f1 2d 9f 00 41 bf f0 01 00 00 4c 03 3b <89> eb bf 05 00 00 00 89 ee e8 fa be 35 00 83 fd 04 0f 87 a0 02 00
RSP: 0018:ffffc90005eff590 EFLAGS: 00000286
RAX: 1ffff11005d58516 RBX: ffff88802eac28b0 RCX: ffff8880252e3e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f5f467 R12: ffff88802eac1f00
R13: dffffc0000000000 R14: ffffc90005eff6c0 R15: ffff888032a2bdf0
 __unhash_process kernel/exit.c:145 [inline]
 __exit_signal kernel/exit.c:212 [inline]
 release_task+0xcad/0x16c0 kernel/exit.c:270
 wait_task_zombie kernel/exit.c:1314 [inline]
 wait_consider_task+0x197d/0x2df0 kernel/exit.c:1541
 do_wait_pid kernel/exit.c:1680 [inline]
 __do_wait+0x527/0x720 kernel/exit.c:1715
 do_wait+0x1e7/0x510 kernel/exit.c:1756
 kernel_wait+0xd6/0x1c0 kernel/exit.c:1932
 call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
 call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 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>