======================================
| [   20.772246][    C2] 1 lock held by ksoftirqd/2/27:
| [ 20.772426][ C2] #0: ffffffff943774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   20.772729][    C2]
| [   20.772729][    C2] stack backtrace:
[   20.772946][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.772949][    C2] Call Trace:
[   20.772951][    C2]  <TASK>
[ 20.772953][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.772960][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 20.772965][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 20.772970][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.772974][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 20.772980][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 20.772984][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 20.772987][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 20.772990][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 20.772994][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 20.772997][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.773002][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.773006][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 20.773008][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.773013][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 20.773016][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.773020][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 20.773024][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 20.773028][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 20.773034][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.773037][ C2] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.773043][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.773046][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.773049][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.773054][ C2] ? kthread (kernel/kthread.c:464) 
[ 20.773056][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.773059][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.773064][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.773067][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.773073][ C2] __put_net (net/core/net_namespace.c:732) 
[ 20.773077][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.773081][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.773083][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.773088][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.773092][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.773095][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.773098][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.773102][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.773106][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 20.773110][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.773114][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.773116][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.773120][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.773124][ C2] kthread (kernel/kthread.c:464) 
[ 20.773127][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.773129][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.773132][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.773135][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.773138][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.773141][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.773144][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.773146][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   20.784135][    C2] RCU nest depth: 0, expected: 0
| [   20.784440][    C2] INFO: lockdep is turned off.
| [   20.784622][    C2] Preemption disabled at:
| [ 20.784623][ C2] handle_softirqs (kernel/softirq.c:553) 
[   20.784986][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.784989][    C2] Call Trace:
[   20.784990][    C2]  <TASK>
[ 20.784993][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.785000][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 20.785007][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.785011][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.785014][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 20.785018][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.785023][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 20.785029][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 20.785032][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 20.785035][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.785040][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.785043][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 20.785049][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.785053][ C2] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.785058][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.785061][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.785064][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.785068][ C2] ? kthread (kernel/kthread.c:464) 
[ 20.785071][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.785075][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.785080][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.785084][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.785089][ C2] __put_net (net/core/net_namespace.c:732) 
[ 20.785093][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.785097][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.785100][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.785104][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.785108][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.785111][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.785114][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.785118][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.785122][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 20.785126][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.785130][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.785133][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.785136][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.785140][ C2] kthread (kernel/kthread.c:464) 
[ 20.785143][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.785145][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.785148][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.785151][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.785154][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.785157][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.785160][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.785162][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   27.789433][    C0] INFO: lockdep is turned off.
| [   27.789902][    C0] Preemption disabled at:
| [ 27.789906][ C0] handle_softirqs (kernel/softirq.c:553) 
| [   27.790891][    C0] Tainted: [W]=WARN
[   27.790894][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   27.790897][    C0] Call Trace:
[   27.790900][    C0]  <IRQ>
[ 27.790904][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 27.790916][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 27.790927][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 27.790935][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 27.790940][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 27.790946][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 27.790953][ C0] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 27.790963][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 27.790968][ C0] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 27.790974][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 27.790984][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 27.790989][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 27.790999][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 27.791004][ C0] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 27.791012][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 27.791018][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 27.791024][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 27.791029][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 27.791036][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 27.791043][ C0] ? stack_access_ok (arch/x86/kernel/unwind_orc.c:398) 
[ 27.791049][ C0] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:403 arch/x86/kernel/unwind_orc.c:585) 
[ 27.791054][ C0] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 27.791060][ C0] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 27.791065][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 27.791072][ C0] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 27.791078][ C0] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3092) 
[ 27.791085][ C0] ? __put_anon_vma (mm/rmap.c:2757) 
[ 27.791092][ C0] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 27.791098][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 27.791107][ C0] __put_net (net/core/net_namespace.c:732) 
[ 27.791113][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 27.791120][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 27.791125][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 27.791134][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 27.791141][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 27.791150][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 27.791160][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 27.791168][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 27.791178][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 27.791183][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 27.791188][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   27.791195][    C0]  </IRQ>
[   27.791197][    C0]  <TASK>
[ 27.791200][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 27.791205][ C0] RIP: 0010:stack_access_ok (arch/x86/kernel/unwind_orc.c:398) 
[ 27.791211][ C0] Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f1 00 00 00 48 8b 73 28 48 89 da 48 89 ef e8 66 6e f5 ff 85 c0 74 15 31 c0 48 83 c4 08 5b <5d> 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 b8 00 00 00 00 00 fc
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   a:	0f 85 f1 00 00 00    	jne    0x101
  10:	48 8b 73 28          	mov    0x28(%rbx),%rsi
  14:	48 89 da             	mov    %rbx,%rdx
  17:	48 89 ef             	mov    %rbp,%rdi
  1a:	e8 66 6e f5 ff       	call   0xfffffffffff56e85
  1f:	85 c0                	test   %eax,%eax
  21:	74 15                	je     0x38
  23:	31 c0                	xor    %eax,%eax
  25:	48 83 c4 08          	add    $0x8,%rsp
  29:	5b                   	pop    %rbx
  2a:*	5d                   	pop    %rbp		<-- trapping instruction
  2b:	41 5c                	pop    %r12
  2d:	41 5d                	pop    %r13
  2f:	41 5e                	pop    %r14
  31:	41 5f                	pop    %r15
  33:	c3                   	ret
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	cc                   	int3
  38:	48                   	rex.W
  39:	b8 00 00 00 00       	mov    $0x0,%eax
  3e:	00 fc                	add    %bh,%ah

Code starting with the faulting instruction
===========================================
   0:	5d                   	pop    %rbp
   1:	41 5c                	pop    %r12
   3:	41 5d                	pop    %r13
   5:	41 5e                	pop    %r14
   7:	41 5f                	pop    %r15
   9:	c3                   	ret
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	cc                   	int3
   e:	48                   	rex.W
   f:	b8 00 00 00 00       	mov    $0x0,%eax
  14:	00 fc                	add    %bh,%ah
[   27.791216][    C0] RSP: 0018:ffffc90000a575e8 EFLAGS: 00000292
[   27.791222][    C0] RAX: 0000000000000001 RBX: 1ffff9200014aecc RCX: ffffc90000a58000
[   27.791225][    C0] RDX: ffffc90000a57e01 RSI: 0000000000000001 RDI: ffffc90000a57718
[   27.791228][    C0] RBP: ffffc90000a57ea0 R08: 0000000000000000 R09: ffffc90000a57759
[   27.791231][    C0] R10: ffffffff90a12687 R11: ffffc90000a57758 R12: 0000000000000008
[   27.791233][    C0] R13: ffffc90000a57720 R14: ffffc90000a57728 R15: ffffc90000a50000
[ 27.791239][ C0] ? unwind_next_frame (./include/linux/rcupdate.h:331 ./include/linux/rcupdate.h:841 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 27.791289][ C0] unwind_next_frame (arch/x86/kernel/unwind_orc.c:403 arch/x86/kernel/unwind_orc.c:585) 
[ 27.791295][ C0] ? exit_mm (kernel/exit.c:596) 
[ 27.791305][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 27.791314][ C0] ? exit_mm (kernel/exit.c:596) 
[ 27.791319][ C0] ? kernel_text_address (kernel/extable.c:99) 
[ 27.791325][ C0] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 27.791331][ C0] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 27.791341][ C0] ? exit_mm (kernel/exit.c:596) 
[ 27.791350][ C0] stack_trace_save (kernel/stacktrace.c:123) 
[ 27.791355][ C0] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 27.791364][ C0] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 27.791369][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 27.791374][ C0] kasan_save_stack (mm/kasan/common.c:48) 
[ 27.791379][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 27.791384][ C0] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 27.791389][ C0] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3092) 
[ 27.791394][ C0] ? __put_anon_vma (mm/rmap.c:2757) 
[ 27.791399][ C0] ? unlink_anon_vmas (./include/linux/rmap.h:117 mm/rmap.c:444) 
[ 27.791403][ C0] ? free_pgtables (mm/memory.c:392) 
[ 27.791410][ C0] ? exit_mmap (mm/mmap.c:1297) 
[ 27.791416][ C0] ? mmput (kernel/fork.c:1449 kernel/fork.c:1383 kernel/fork.c:1404) 
[ 27.791422][ C0] ? exit_mm (kernel/exit.c:596) 
[ 27.791426][ C0] ? do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 27.791431][ C0] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 27.791438][ C0] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 27.791445][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 27.791451][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 27.791458][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 27.791463][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 27.791469][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 27.791476][ C0] ? debug_object_active_state (lib/debugobjects.c:1056) 
[ 27.791486][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 27.791491][ C0] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2126 arch/x86/mm/physaddr.c:65) 
[ 27.791497][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 27.791503][ C0] ? trace_lock_release (./include/trace/events/lock.h:69 (discriminator 21)) 
[ 27.791509][ C0] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5884) 
[ 27.791515][ C0] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:104 ./include/linux/rcupdate.h:955 ./include/linux/mmzone.h:2126 arch/x86/mm/physaddr.c:65) 
[ 27.791522][ C0] kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 27.791527][ C0] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4672) 
[ 27.791535][ C0] __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3092) 
[ 27.791543][ C0] __put_anon_vma (mm/rmap.c:2757) 
[ 27.791550][ C0] unlink_anon_vmas (./include/linux/rmap.h:117 mm/rmap.c:444) 
[ 27.791556][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 27.791563][ C0] free_pgtables (mm/memory.c:392) 
[ 27.791574][ C0] ? __pfx_free_pgtables (mm/memory.c:349) 
[ 27.791579][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 27.791583][ C0] ? exit_mmap (./include/linux/seqlock.h:431 ./include/linux/mmap_lock.h:83 ./include/linux/mmap_lock.h:130 mm/mmap.c:1292) 
[ 27.791592][ C0] ? down_write (./arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1307 kernel/locking/rwsem.c:1313 kernel/locking/rwsem.c:1578) 
[ 27.791597][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 27.791603][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 27.791608][ C0] ? trace_lock_release (./include/trace/events/lock.h:69 (discriminator 21)) 
[ 27.791616][ C0] exit_mmap (mm/mmap.c:1297) 
[ 27.791624][ C0] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 27.791630][ C0] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 27.791639][ C0] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5884) 
[ 27.791644][ C0] ? __mutex_unlock_slowpath (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4329 ./include/linux/atomic/atomic-long.h:1506 ./include/linux/atomic/atomic-instrumented.h:4481 kernel/locking/mutex.c:924) 
[ 27.791661][ C0] mmput (kernel/fork.c:1449 kernel/fork.c:1383 kernel/fork.c:1404) 
[ 27.791668][ C0] exit_mm (kernel/exit.c:596) 
[ 27.791675][ C0] do_exit (kernel/exit.c:950) 
[ 27.791683][ C0] do_group_exit (kernel/exit.c:1089) 
[ 27.791690][ C0] __x64_sys_exit_group (kernel/exit.c:1117) 
[ 27.791696][ C0] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 27.791703][ C0] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 27.791709][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   27.791714][    C0] RIP: 0033:0x7f982bc7dabd
[ 27.791720][ C0] Code: Unable to access opcode bytes at 0x7f982bc7da93.

Code starting with the faulting instruction
===========================================
[   27.791722][    C0] RSP: 002b:00007fffc3433a28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   27.791728][    C0] RAX: ffffffffffffffda RBX: 00007f982bd5a9c0 RCX: 00007f982bc7dabd
[   27.791732][    C0] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   27.791735][    C0] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000038
[   27.791738][    C0] R10: 00007fffc3433890 R11: 0000000000000246 R12: 00007f982bd5a9c0


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal