======================================
| [ 16.550877][ C2] #3: ffff88800a458b00 (&anon_vma->rwsem){+.+.}-{4:4}, at: unlink_anon_vmas (mm/rmap.c:409) 
| [ 16.551536][ C2] #4: ffffffffa69774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   16.552188][    C2]
| [   16.552188][    C2] stack backtrace:
[   16.552654][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.552657][    C2] Call Trace:
[   16.552659][    C2]  <IRQ>
[ 16.552661][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.552669][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 16.552677][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 16.552685][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.552692][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 16.552701][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 16.552706][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 16.552711][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 16.552716][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 16.552722][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 16.552727][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.552734][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.552741][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 16.552745][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.552752][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.552759][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.552763][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 16.552769][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.552775][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.552782][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.552788][ 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) 
[ 16.552795][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.552801][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.552806][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.552812][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.552818][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.552824][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.552829][ C2] ? __delete_object (./arch/x86/include/asm/atomic.h:67 (discriminator 3) ./include/linux/atomic/atomic-arch-fallback.h:2278 (discriminator 3) ./include/linux/atomic/atomic-instrumented.h:1384 (discriminator 3) mm/kmemleak.c:550 (discriminator 3) mm/kmemleak.c:818 (discriminator 3)) 
[ 16.552836][ C2] ? kmem_cache_free (./include/linux/kmemleak.h:49 mm/slub.c:2305 mm/slub.c:4642 mm/slub.c:4744) 
[ 16.552842][ C2] ? unlink_anon_vmas (mm/rmap.c:405 (discriminator 2)) 
[ 16.552847][ C2] ? free_pgtables (mm/memory.c:392) 
[ 16.552853][ C2] ? exit_mmap (mm/mmap.c:1297) 
[ 16.552859][ C2] ? mmput (kernel/fork.c:1449 kernel/fork.c:1383 kernel/fork.c:1404) 
[ 16.552863][ C2] ? exec_mmap (fs/exec.c:954) 
[ 16.552873][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.552878][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.552885][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.552890][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.552896][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.552904][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.552910][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4328) 
[ 16.552914][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 16.552919][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.552925][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.552932][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.552941][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.552946][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.552951][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.552957][    C2]  </IRQ>
[   16.552959][    C2]  <TASK>
[ 16.552962][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.552967][ C2] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.552974][ C2] Code: 74 24 10 e8 c1 1e 83 fd 48 89 ef e8 79 71 83 fd 81 e3 00 02 00 00 75 29 9c 58 f6 c4 02 75 35 48 85 db 74 01 fb bf 01 00 00 00 <e8> fa 6e 77 fd 65 8b 05 13 6d 97 02 85 c0 74 0e 5b 5d c3 cc cc cc
All code
========
   0:	74 24                	je     0x26
   2:	10 e8                	adc    %ch,%al
   4:	c1 1e 83             	rcrl   $0x83,(%rsi)
   7:	fd                   	std
   8:	48 89 ef             	mov    %rbp,%rdi
   b:	e8 79 71 83 fd       	call   0xfffffffffd837189
  10:	81 e3 00 02 00 00    	and    $0x200,%ebx
  16:	75 29                	jne    0x41
  18:	9c                   	pushf
  19:	58                   	pop    %rax
  1a:	f6 c4 02             	test   $0x2,%ah
  1d:	75 35                	jne    0x54
  1f:	48 85 db             	test   %rbx,%rbx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
  2a:*	e8 fa 6e 77 fd       	call   0xfffffffffd776f29		<-- trapping instruction
  2f:	65 8b 05 13 6d 97 02 	mov    %gs:0x2976d13(%rip),%eax        # 0x2976d49
  36:	85 c0                	test   %eax,%eax
  38:	74 0e                	je     0x48
  3a:	5b                   	pop    %rbx
  3b:	5d                   	pop    %rbp
  3c:	c3                   	ret
  3d:	cc                   	int3
  3e:	cc                   	int3
  3f:	cc                   	int3

Code starting with the faulting instruction
===========================================
   0:	e8 fa 6e 77 fd       	call   0xfffffffffd776eff
   5:	65 8b 05 13 6d 97 02 	mov    %gs:0x2976d13(%rip),%eax        # 0x2976d1f
   c:	85 c0                	test   %eax,%eax
   e:	74 0e                	je     0x1e
  10:	5b                   	pop    %rbx
  11:	5d                   	pop    %rbp
  12:	c3                   	ret
  13:	cc                   	int3
  14:	cc                   	int3
  15:	cc                   	int3
[   16.552978][    C2] RSP: 0018:ffffc90000ad7748 EFLAGS: 00000206
[   16.552984][    C2] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 0000000000000040
[   16.552987][    C2] RDX: 0000000000000000 RSI: ffffffffa648f4e4 RDI: 0000000000000001
[   16.552990][    C2] RBP: ffff888009298890 R08: 0000000000000001 R09: 0000000000000001
[   16.552994][    C2] R10: ffffffffa73e68d7 R11: ffff8880092988a8 R12: ffffea000015dbc0
[   16.552997][    C2] R13: 0000000000026187 R14: 0000000000000000 R15: ffff888001942040
[ 16.553009][ C2] __delete_object (./arch/x86/include/asm/atomic.h:67 (discriminator 3) ./include/linux/atomic/atomic-arch-fallback.h:2278 (discriminator 3) ./include/linux/atomic/atomic-instrumented.h:1384 (discriminator 3) mm/kmemleak.c:550 (discriminator 3) mm/kmemleak.c:818 (discriminator 3)) 
[ 16.553015][ C2] kmem_cache_free (./include/linux/kmemleak.h:49 mm/slub.c:2305 mm/slub.c:4642 mm/slub.c:4744) 
[ 16.553020][ C2] ? unlink_anon_vmas (mm/rmap.c:405 (discriminator 2)) 
[ 16.553028][ C2] unlink_anon_vmas (mm/rmap.c:405 (discriminator 2)) 
[ 16.553037][ C2] free_pgtables (mm/memory.c:392) 
[ 16.553047][ C2] ? __pfx_free_pgtables (mm/memory.c:349) 
[ 16.553051][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 16.553056][ C2] ? exit_mmap (./include/linux/seqlock.h:431 ./include/linux/mmap_lock.h:83 ./include/linux/mmap_lock.h:130 mm/mmap.c:1292) 
[ 16.553063][ C2] ? down_write (./arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1307 kernel/locking/rwsem.c:1313 kernel/locking/rwsem.c:1578) 
[ 16.553068][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.553077][ C2] exit_mmap (mm/mmap.c:1297) 
[ 16.553085][ C2] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 16.553097][ 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) 
[ 16.553113][ C2] mmput (kernel/fork.c:1449 kernel/fork.c:1383 kernel/fork.c:1404) 
[ 16.553120][ C2] exec_mmap (fs/exec.c:954) 
[ 16.553127][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.553132][ C2] begin_new_exec (fs/exec.c:1204) 
[ 16.553142][ C2] load_elf_binary (fs/binfmt_elf.c:996) 
[ 16.553152][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 16.553162][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.553168][ C2] ? __pfx_load_elf_binary (fs/binfmt_elf.c:818) 
[ 16.553173][ C2] ? exec_binprm (fs/exec.c:1718 fs/exec.c:1750) 
[ 16.553184][ C2] exec_binprm (fs/exec.c:1718 fs/exec.c:1750) 
[ 16.553193][ C2] ? __pfx_exec_binprm (fs/exec.c:1734) 
[ 16.553198][ C2] ? bprm_execve (fs/exec.c:1792 fs/exec.c:1778) 
[ 16.553209][ C2] bprm_execve (fs/exec.c:1802 fs/exec.c:1778) 
[ 16.553216][ C2] do_execveat_common.isra.0 (fs/exec.c:1908) 
[ 16.553226][ C2] __x64_sys_execve (fs/exec.c:2053) 
[ 16.553233][ C2] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 16.553240][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   16.553245][    C2] RIP: 0033:0x7f6acfb8740b
[ 16.553255][ C2] Code: Unable to access opcode bytes at 0x7f6acfb873e1.

Code starting with the faulting instruction
===========================================
[   16.553258][    C2] RSP: 002b:00007ffca29ecc18 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
[   16.553263][    C2] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6acfb8740b
[   16.553266][    C2] RDX: 00005619acc08620 RSI: 00005619acbfbd70 RDI: 00005619acc09140
[   16.553270][    C2] RBP: 00005619acc09140 R08: 00005619acc08210 R09: 0000000000000020
[   16.553273][    C2] R10: 00000000000001b6 R11: 0000000000000246 R12: 00000000ffffffff
[   16.553276][    C2] R13: 00005619acbfbd70 R14: 00005619acc08620 R15: 00005619acbf7650
| [   16.595394][    C2] RCU nest depth: 0, expected: 0
| [   16.595759][    C2] INFO: lockdep is turned off.
| [   16.596135][    C2] Preemption disabled at:
| [ 16.596139][ C2] 0x0 
[   16.597046][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.597050][    C2] Call Trace:
[   16.597052][    C2]  <IRQ>
[ 16.597055][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.597066][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 16.597077][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.597085][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.597090][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.597095][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.597103][ 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) 
[ 16.597112][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.597117][ 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) 
[ 16.597122][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.597132][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.597137][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.597146][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.597152][ 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) 
[ 16.597159][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.597165][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.597169][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.597176][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.597183][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.597189][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.597195][ C2] ? __delete_object (./arch/x86/include/asm/atomic.h:67 (discriminator 3) ./include/linux/atomic/atomic-arch-fallback.h:2278 (discriminator 3) ./include/linux/atomic/atomic-instrumented.h:1384 (discriminator 3) mm/kmemleak.c:550 (discriminator 3) mm/kmemleak.c:818 (discriminator 3)) 
[ 16.597201][ C2] ? kmem_cache_free (./include/linux/kmemleak.h:49 mm/slub.c:2305 mm/slub.c:4642 mm/slub.c:4744) 
[ 16.597209][ C2] ? unlink_anon_vmas (mm/rmap.c:405 (discriminator 2)) 
[ 16.597215][ C2] ? free_pgtables (mm/memory.c:392) 
[ 16.597221][ C2] ? exit_mmap (mm/mmap.c:1297) 
[ 16.597226][ C2] ? mmput (kernel/fork.c:1449 kernel/fork.c:1383 kernel/fork.c:1404) 
[ 16.597231][ C2] ? exec_mmap (fs/exec.c:954) 
[ 16.597242][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.597248][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.597254][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.597258][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.597264][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.597272][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.597279][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4328) 
[ 16.597284][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 16.597288][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.597296][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.597303][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.597313][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.597317][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.597322][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.597328][    C2]  </IRQ>
[   16.597330][    C2]  <TASK>
[ 16.597333][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.597338][ C2] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.597345][ C2] Code: 74 24 10 e8 c1 1e 83 fd 48 89 ef e8 79 71 83 fd 81 e3 00 02 00 00 75 29 9c 58 f6 c4 02 75 35 48 85 db 74 01 fb bf 01 00 00 00 <e8> fa 6e 77 fd 65 8b 05 13 6d 97 02 85 c0 74 0e 5b 5d c3 cc cc cc
All code
========
   0:	74 24                	je     0x26
   2:	10 e8                	adc    %ch,%al
   4:	c1 1e 83             	rcrl   $0x83,(%rsi)
   7:	fd                   	std
   8:	48 89 ef             	mov    %rbp,%rdi
   b:	e8 79 71 83 fd       	call   0xfffffffffd837189
  10:	81 e3 00 02 00 00    	and    $0x200,%ebx
  16:	75 29                	jne    0x41
  18:	9c                   	pushf
  19:	58                   	pop    %rax
  1a:	f6 c4 02             	test   $0x2,%ah
  1d:	75 35                	jne    0x54
  1f:	48 85 db             	test   %rbx,%rbx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
  2a:*	e8 fa 6e 77 fd       	call   0xfffffffffd776f29		<-- trapping instruction
  2f:	65 8b 05 13 6d 97 02 	mov    %gs:0x2976d13(%rip),%eax        # 0x2976d49
  36:	85 c0                	test   %eax,%eax
  38:	74 0e                	je     0x48
  3a:	5b                   	pop    %rbx
  3b:	5d                   	pop    %rbp
  3c:	c3                   	ret
  3d:	cc                   	int3
  3e:	cc                   	int3
  3f:	cc                   	int3

Code starting with the faulting instruction
===========================================
   0:	e8 fa 6e 77 fd       	call   0xfffffffffd776eff
   5:	65 8b 05 13 6d 97 02 	mov    %gs:0x2976d13(%rip),%eax        # 0x2976d1f
   c:	85 c0                	test   %eax,%eax
   e:	74 0e                	je     0x1e
  10:	5b                   	pop    %rbx
  11:	5d                   	pop    %rbp
  12:	c3                   	ret
  13:	cc                   	int3
  14:	cc                   	int3
  15:	cc                   	int3
[   16.597350][    C2] RSP: 0018:ffffc90000ad7748 EFLAGS: 00000206
[   16.597355][    C2] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 0000000000000040
[   16.597359][    C2] RDX: 0000000000000000 RSI: ffffffffa648f4e4 RDI: 0000000000000001
[   16.597362][    C2] RBP: ffff888009298890 R08: 0000000000000001 R09: 0000000000000001
[   16.597365][    C2] R10: ffffffffa73e68d7 R11: ffff8880092988a8 R12: ffffea000015dbc0
[   16.597369][    C2] R13: 0000000000026187 R14: 0000000000000000 R15: ffff888001942040
[ 16.597382][ C2] __delete_object (./arch/x86/include/asm/atomic.h:67 (discriminator 3) ./include/linux/atomic/atomic-arch-fallback.h:2278 (discriminator 3) ./include/linux/atomic/atomic-instrumented.h:1384 (discriminator 3) mm/kmemleak.c:550 (discriminator 3) mm/kmemleak.c:818 (discriminator 3)) 
[ 16.597388][ C2] kmem_cache_free (./include/linux/kmemleak.h:49 mm/slub.c:2305 mm/slub.c:4642 mm/slub.c:4744) 
[ 16.597394][ C2] ? unlink_anon_vmas (mm/rmap.c:405 (discriminator 2)) 
[ 16.597401][ C2] unlink_anon_vmas (mm/rmap.c:405 (discriminator 2)) 
[ 16.597411][ C2] free_pgtables (mm/memory.c:392) 
[ 16.597420][ C2] ? __pfx_free_pgtables (mm/memory.c:349) 
[ 16.597425][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 16.597430][ C2] ? exit_mmap (./include/linux/seqlock.h:431 ./include/linux/mmap_lock.h:83 ./include/linux/mmap_lock.h:130 mm/mmap.c:1292) 
[ 16.597438][ C2] ? down_write (./arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1307 kernel/locking/rwsem.c:1313 kernel/locking/rwsem.c:1578) 
[ 16.597443][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.597453][ C2] exit_mmap (mm/mmap.c:1297) 
[ 16.597461][ C2] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 16.597473][ 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) 
[ 16.597490][ C2] mmput (kernel/fork.c:1449 kernel/fork.c:1383 kernel/fork.c:1404) 
[ 16.597496][ C2] exec_mmap (fs/exec.c:954) 
[ 16.597503][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.597510][ C2] begin_new_exec (fs/exec.c:1204) 
[ 16.597519][ C2] load_elf_binary (fs/binfmt_elf.c:996) 
[ 16.597531][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 16.597540][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.597547][ C2] ? __pfx_load_elf_binary (fs/binfmt_elf.c:818) 
[ 16.597552][ C2] ? exec_binprm (fs/exec.c:1718 fs/exec.c:1750) 
[ 16.597563][ C2] exec_binprm (fs/exec.c:1718 fs/exec.c:1750) 
[ 16.597572][ C2] ? __pfx_exec_binprm (fs/exec.c:1734) 
[ 16.597577][ C2] ? bprm_execve (fs/exec.c:1792 fs/exec.c:1778) 
[ 16.597588][ C2] bprm_execve (fs/exec.c:1802 fs/exec.c:1778) 
[ 16.597595][ C2] do_execveat_common.isra.0 (fs/exec.c:1908) 
[ 16.597605][ C2] __x64_sys_execve (fs/exec.c:2053) 
[ 16.597612][ C2] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 16.597618][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   16.597623][    C2] RIP: 0033:0x7f6acfb8740b
[ 16.597633][ C2] Code: Unable to access opcode bytes at 0x7f6acfb873e1.

Code starting with the faulting instruction
===========================================
[   16.597636][    C2] RSP: 002b:00007ffca29ecc18 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
[   16.597640][    C2] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6acfb8740b
[   16.597644][    C2] RDX: 00005619acc08620 RSI: 00005619acbfbd70 RDI: 00005619acc09140
[   16.597647][    C2] RBP: 00005619acc09140 R08: 00005619acc08210 R09: 0000000000000020
[   16.597650][    C2] R10: 00000000000001b6 R11: 0000000000000246 R12: 00000000ffffffff
[   16.597654][    C2] R13: 00005619acbfbd70 R14: 00005619acc08620 R15: 00005619acbf7650
| [   18.860474][    C3] INFO: lockdep is turned off.
| [   18.860746][    C3] Preemption disabled at:
| [ 18.860749][ C3] handle_softirqs (kernel/softirq.c:553) 
| [   18.861346][    C3] Tainted: [W]=WARN
[   18.861349][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.861352][    C3] Call Trace:
[   18.861355][    C3]  <TASK>
[ 18.861358][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.861368][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 18.861379][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.861386][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.861391][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 18.861397][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.861405][ C3] ? 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) 
[ 18.861413][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 18.861418][ C3] ? 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) 
[ 18.861423][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.861432][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.861437][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 18.861446][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 18.861451][ C3] ? __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) 
[ 18.861458][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.861464][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 18.861469][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.861475][ C3] ? kthread (kernel/kthread.c:464) 
[ 18.861479][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.861484][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 18.861491][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 18.861497][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 18.861503][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.861509][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.861518][ C3] __put_net (net/core/net_namespace.c:732) 
[ 18.861524][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 18.861531][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.861535][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.861541][ C3] ? __schedule (kernel/sched/core.c:6658) 
[ 18.861550][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 18.861556][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.861561][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.861572][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 18.861580][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 18.861588][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 18.861595][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 18.861600][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.861606][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 18.861613][ C3] kthread (kernel/kthread.c:464) 
[ 18.861618][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.861622][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 18.861626][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 18.861633][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.861638][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.861644][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.861649][ C3] ? __pfx_kthread (kernel/kthread.c:413) 


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