======================================
| [   20.310017][    C1] 1 lock held by ksoftirqd/1/22:
| [ 20.310210][ C1] #0: ffffffff97b774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   20.310559][    C1]
| [   20.310559][    C1] stack backtrace:
[   20.310836][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.310838][    C1] Call Trace:
[   20.310841][    C1]  <TASK>
[ 20.310844][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.310852][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 20.310859][ C1] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 20.310863][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.310868][ C1] ? save_trace (kernel/locking/lockdep.c:595) 
[ 20.310874][ C1] mark_lock (kernel/locking/lockdep.c:4756) 
[ 20.310878][ C1] mark_usage (kernel/locking/lockdep.c:4645) 
[ 20.310881][ C1] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 20.310884][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 20.310888][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 20.310892][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.310897][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.310902][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 20.310904][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.310909][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 20.310914][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.310917][ C1] simple_pin_fs (fs/libfs.c:1067) 
[ 20.310921][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 20.310925][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 20.310932][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 20.310935][ C1] ? __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) 
[ 20.310941][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.310944][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 20.310947][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.310952][ C1] ? kthread (kernel/kthread.c:464) 
[ 20.310955][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.310959][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.310964][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.310968][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.310974][ C1] __put_net (net/core/net_namespace.c:732) 
[ 20.310978][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.310982][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.310984][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.310989][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.310992][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.310995][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.310998][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.311003][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.311007][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 20.311013][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.311016][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.311019][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.311023][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.311027][ C1] kthread (kernel/kthread.c:464) 
[ 20.311030][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.311032][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.311034][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.311038][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.311041][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.311044][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.311046][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.311049][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   20.326540][    C1] RCU nest depth: 0, expected: 0
| [   20.326810][    C1] INFO: lockdep is turned off.
| [   20.327087][    C1] Preemption disabled at:
| [ 20.327090][ C1] handle_softirqs (kernel/softirq.c:553) 
[   20.327635][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.327639][    C1] Call Trace:
[   20.327642][    C1]  <TASK>
[ 20.327647][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.327658][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 20.327668][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.327674][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.327678][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 20.327684][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.327691][ C1] ? 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) 
[ 20.327702][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 20.327707][ C1] ? 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) 
[ 20.327712][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.327722][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.327727][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 20.327735][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 20.327740][ C1] ? __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) 
[ 20.327748][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.327757][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 20.327762][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.327768][ C1] ? kthread (kernel/kthread.c:464) 
[ 20.327773][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.327779][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.327786][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 20.327792][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.327802][ C1] __put_net (net/core/net_namespace.c:732) 
[ 20.327809][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.327816][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.327820][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.327830][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.327836][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.327840][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.327845][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.327853][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.327860][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 20.327868][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.327874][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.327879][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.327886][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.327892][ C1] kthread (kernel/kthread.c:464) 
[ 20.327897][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.327901][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.327906][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.327912][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.327917][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.327923][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.327928][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.327933][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   24.330857][    C2] INFO: lockdep is turned off.
| [   24.331068][    C2] Preemption disabled at:
| [ 24.331070][ C2] __slab_alloc.constprop.0 (mm/slub.c:3945) 
| [   24.331555][    C2] Tainted: [W]=WARN
[   24.331557][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   24.331559][    C2] Call Trace:
[   24.331561][    C2]  <IRQ>
[ 24.331563][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 24.331571][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 24.331578][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 24.331582][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 24.331585][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 24.331589][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 24.331595][ 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) 
[ 24.331600][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 24.331603][ 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) 
[ 24.331606][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 24.331612][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 24.331615][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 24.331621][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 24.331625][ 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) 
[ 24.331630][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 24.331633][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 24.331637][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 24.331641][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 24.331646][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 24.331650][ C2] ? __orc_find (arch/x86/kernel/unwind_orc.c:85) 
[ 24.331654][ C2] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:495) 
[ 24.331657][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 24.331661][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 24.331664][ C2] ? set_track_prepare (mm/slub.c:936) 
[ 24.331668][ C2] ? ___slab_alloc (mm/slub.c:967 mm/slub.c:3848) 
[ 24.331671][ C2] ? __slab_alloc.constprop.0 (mm/slub.c:3948) 
[ 24.331674][ C2] ? __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 24.331677][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 24.331681][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 24.331686][ C2] __put_net (net/core/net_namespace.c:732) 
[ 24.331689][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 24.331693][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 24.331696][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 24.331700][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 24.331704][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 24.331707][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 24.331714][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 24.331718][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 24.331724][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 24.331727][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 24.331730][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   24.331734][    C2]  </IRQ>
[   24.331735][    C2]  <TASK>
[ 24.331736][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 24.331739][ C2] RIP: 0010:__orc_find (arch/x86/kernel/unwind_orc.c:85) 
[ 24.331742][ C2] Code: 90 90 90 48 8b 07 c3 cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 41 57 <41> 56 41 55 49 89 cd 89 d1 41 54 4c 8d 64 8f fc 55 53 48 83 ec 08
All code
========
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	48 8b 07             	mov    (%rdi),%rax
   6:	c3                   	ret
   7:	cc                   	int3
   8:	cc                   	int3
   9:	cc                   	int3
   a:	cc                   	int3
   b:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  12:	00 
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	90                   	nop
  23:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  28:	41 57                	push   %r15
  2a:*	41 56                	push   %r14		<-- trapping instruction
  2c:	41 55                	push   %r13
  2e:	49 89 cd             	mov    %rcx,%r13
  31:	89 d1                	mov    %edx,%ecx
  33:	41 54                	push   %r12
  35:	4c 8d 64 8f fc       	lea    -0x4(%rdi,%rcx,4),%r12
  3a:	55                   	push   %rbp
  3b:	53                   	push   %rbx
  3c:	48 83 ec 08          	sub    $0x8,%rsp

Code starting with the faulting instruction
===========================================
   0:	41 56                	push   %r14
   2:	41 55                	push   %r13
   4:	49 89 cd             	mov    %rcx,%r13
   7:	89 d1                	mov    %edx,%ecx
   9:	41 54                	push   %r12
   b:	4c 8d 64 8f fc       	lea    -0x4(%rdi,%rcx,4),%r12
  10:	55                   	push   %rbp
  11:	53                   	push   %rbx
  12:	48 83 ec 08          	sub    $0x8,%rsp
[   24.331745][    C2] RSP: 0018:ffffc90000737840 EFLAGS: 00000282
[   24.331749][    C2] RAX: 0000000000013b13 RBX: 1ffff920000e6f13 RCX: ffffffff94280d27
[   24.331754][    C2] RDX: 0000000000000001 RSI: ffffffff989b22aa RDI: ffffffff9867616c
[   24.331756][    C2] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffc90000737991
[   24.331757][    C2] R10: ffffffff94212687 R11: ffffc90000737990 R12: ffffc900007379a8
[   24.331759][    C2] R13: ffffc90000737950 R14: ffff888004ec0040 R15: 0000000000000000
[ 24.331763][ C2] ? 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) 
[ 24.331766][ C2] ? do_group_exit (kernel/exit.c:1108) 
[ 24.331773][ C2] unwind_next_frame (arch/x86/kernel/unwind_orc.c:495) 
[ 24.331776][ C2] ? do_group_exit (kernel/exit.c:1089) 
[ 24.331780][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 24.331783][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 24.331788][ C2] ? do_group_exit (kernel/exit.c:1089) 
[ 24.331791][ C2] ? kernel_text_address (kernel/extable.c:99) 
[ 24.331795][ C2] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 24.331798][ C2] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 24.331804][ C2] ? do_group_exit (kernel/exit.c:1089) 
[ 24.331808][ C2] stack_trace_save (kernel/stacktrace.c:123) 
[ 24.331811][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 24.331815][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 24.331818][ C2] set_track_prepare (mm/slub.c:936) 
[ 24.331821][ C2] ? __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 24.331824][ C2] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 24.331828][ C2] ? exit_mmap (mm/mmap.c:1311) 
[ 24.331833][ C2] ? mmput (kernel/fork.c:1449 kernel/fork.c:1383 kernel/fork.c:1404) 
[ 24.331836][ C2] ? exit_mm (kernel/exit.c:596) 
[ 24.331839][ C2] ? do_exit (kernel/exit.c:950) 
[ 24.331842][ C2] ? do_group_exit (kernel/exit.c:1089) 
[ 24.331847][ C2] ___slab_alloc (mm/slub.c:967 mm/slub.c:3848) 
[ 24.331851][ C2] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 24.331856][ C2] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 24.331859][ C2] __slab_alloc.constprop.0 (mm/slub.c:3948) 
[ 24.331863][ C2] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 24.331865][ C2] __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 24.331870][ C2] kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 24.331874][ C2] ? exit_mmap (mm/mmap.c:1311) 
[ 24.331878][ C2] exit_mmap (mm/mmap.c:1311) 
[ 24.331883][ C2] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 24.331886][ C2] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 24.331891][ C2] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5884) 
[ 24.331894][ C2] ? __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) 
[ 24.331902][ C2] mmput (kernel/fork.c:1449 kernel/fork.c:1383 kernel/fork.c:1404) 
[ 24.331906][ C2] exit_mm (kernel/exit.c:596) 
[ 24.331910][ C2] do_exit (kernel/exit.c:950) 
[ 24.331914][ C2] do_group_exit (kernel/exit.c:1089) 
[ 24.331918][ C2] __x64_sys_exit_group (kernel/exit.c:1117) 
[ 24.331922][ C2] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 24.331926][ C2] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 24.331930][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   24.331933][    C2] RIP: 0033:0x7f5235f02abd
[ 24.331936][ C2] Code: Unable to access opcode bytes at 0x7f5235f02a93.

Code starting with the faulting instruction
===========================================
[   24.331938][    C2] RSP: 002b:00007fffb20285f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   24.331941][    C2] RAX: ffffffffffffffda RBX: 00007f5235fdf9c0 RCX: 00007f5235f02abd
[   24.331942][    C2] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   24.331944][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020
[   24.331945][    C2] R10: 00007fffb20284a0 R11: 0000000000000246 R12: 00007f5235fdf9c0


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