======================================
| [   15.533814][    C2] 1 lock held by swapper/2/0:
| [ 15.534009][ C2] #0: ffffffffb95749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.534346][    C2]
| [   15.534346][    C2] stack backtrace:
[   15.534584][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.534586][    C2] Call Trace:
[   15.534588][    C2]  <IRQ>
[ 15.534590][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.534596][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.534601][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.534606][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.534612][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.534617][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.534621][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.534625][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.534630][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.534633][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.534636][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.534642][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.534644][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.534647][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.534650][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.534653][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.534656][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.534659][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.534665][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.534668][ 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:2366) 
[ 15.534673][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.534677][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.534680][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.534682][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.534687][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.534691][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.534694][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.534696][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.534699][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.534704][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.534707][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.534710][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.534714][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.534721][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.534725][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.534729][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.534732][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.534736][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.534740][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.534744][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.534748][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.534751][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.534756][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.534760][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.534765][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.534767][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.534770][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.534773][    C2]  </IRQ>
[   15.534774][    C2]  <TASK>
[ 15.534776][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.534778][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.534783][ C2] Code: 60 b8 00 e9 c3 57 02 00 0f 1f 00 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 75 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  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:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   15.534785][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   15.534789][    C2] RAX: 0000000000043227 RBX: 1ffff92000028fc1 RCX: ffffffffb855ba19
[   15.534791][    C2] RDX: 0000000000000000 RSI: ffffffffb9087785 RDI: ffffffffb8851260
[   15.534793][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ea667a
[   15.534794][    C2] R10: ffff88802f5333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.534796][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.534800][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.534805][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.534807][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.534810][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.534813][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.534818][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.534823][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.534827][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.534831][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.534834][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.534839][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.552686][    C2] RCU nest depth: 0, expected: 0
| [   15.552879][    C2] INFO: lockdep is turned off.
| [   15.553066][    C2] Preemption disabled at:
| [ 15.553068][ C2] 0x0 
[   15.553404][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.553406][    C2] Call Trace:
[   15.553408][    C2]  <IRQ>
[ 15.553409][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.553416][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.553422][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.553426][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.553430][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.553434][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.553439][ 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) 
[ 15.553444][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.553447][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.553451][ 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) 
[ 15.553455][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.553458][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.553463][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.553466][ 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:2366) 
[ 15.553472][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.553476][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.553479][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.553482][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.553486][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.553490][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.553493][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.553495][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.553498][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.553503][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.553506][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.553509][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.553514][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.553521][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.553524][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.553528][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.553531][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.553535][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.553540][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.553544][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.553548][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.553552][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.553557][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.553560][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.553565][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.553568][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.553570][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.553573][    C2]  </IRQ>
[   15.553575][    C2]  <TASK>
[ 15.553576][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.553579][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.553583][ C2] Code: 60 b8 00 e9 c3 57 02 00 0f 1f 00 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 75 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  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:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   15.553586][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   15.553589][    C2] RAX: 0000000000043227 RBX: 1ffff92000028fc1 RCX: ffffffffb855ba19
[   15.553591][    C2] RDX: 0000000000000000 RSI: ffffffffb9087785 RDI: ffffffffb8851260
[   15.553593][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ea667a
[   15.553595][    C2] R10: ffff88802f5333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.553596][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.553600][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.553605][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.553607][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.553609][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.553613][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.553618][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.553623][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.553627][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.553630][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.553634][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.553639][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.319865][    C3] INFO: lockdep is turned off.
| [   17.320074][    C3] Preemption disabled at:
| [ 17.320076][ C3] handle_softirqs (kernel/softirq.c:553) 
| [   17.320497][    C3] Tainted: [W]=WARN
[   17.320498][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.320500][    C3] Call Trace:
[   17.320502][    C3]  <IRQ>
[ 17.320504][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.320511][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 17.320517][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.320522][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.320526][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.320531][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320539][ 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) 
[ 17.320544][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.320546][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.320551][ 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) 
[ 17.320555][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.320558][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.320563][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.320566][ 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:2366) 
[ 17.320571][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.320576][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.320579][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.320581][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.320585][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.320589][ C3] ? ftrace_graph_ret_addr (kernel/trace/fgraph.c:956) 
[ 17.320593][ C3] ? unwind_next_frame (./arch/x86/include/asm/unwind.h:111 ./arch/x86/include/asm/unwind.h:127 arch/x86/kernel/unwind_orc.c:588) 
[ 17.320598][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 17.320602][ C3] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 17.320607][ C3] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 17.320611][ C3] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 17.320616][ C3] ? __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:3084) 
[ 17.320620][ C3] ? kmem_cache_free (./include/linux/kmemleak.h:49 mm/slub.c:2305 mm/slub.c:4642 mm/slub.c:4744) 
[ 17.320625][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.320630][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320635][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.320638][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.320642][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.320645][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.320649][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 17.320652][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320656][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.320660][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320664][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.320668][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.320672][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.320676][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.320679][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.320681][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.320684][    C3]  </IRQ>
[   17.320686][    C3]  <TASK>
[ 17.320687][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.320690][ C3] RIP: 0010:ftrace_graph_ret_addr (kernel/trace/fgraph.c:956) 
[ 17.320693][ C3] Code: 24 e8 9b bb 4b 00 48 8b 14 24 e9 31 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 41 57 49 89 d7 <41> 56 41 55 41 54 55 53 48 83 ec 08 48 81 fa d0 46 bf b5 0f 85 70
All code
========
   0:	24 e8                	and    $0xe8,%al
   2:	9b                   	fwait
   3:	bb 4b 00 48 8b       	mov    $0x8b48004b,%ebx
   8:	14 24                	adc    $0x24,%al
   a:	e9 31 ff ff ff       	jmp    0xffffffffffffff40
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  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:	66 0f 1f 00          	nopw   (%rax)
  25:	41 57                	push   %r15
  27:	49 89 d7             	mov    %rdx,%r15
  2a:*	41 56                	push   %r14		<-- trapping instruction
  2c:	41 55                	push   %r13
  2e:	41 54                	push   %r12
  30:	55                   	push   %rbp
  31:	53                   	push   %rbx
  32:	48 83 ec 08          	sub    $0x8,%rsp
  36:	48 81 fa d0 46 bf b5 	cmp    $0xffffffffb5bf46d0,%rdx
  3d:	0f                   	.byte 0xf
  3e:	85                   	.byte 0x85
  3f:	70                   	.byte 0x70

Code starting with the faulting instruction
===========================================
   0:	41 56                	push   %r14
   2:	41 55                	push   %r13
   4:	41 54                	push   %r12
   6:	55                   	push   %rbp
   7:	53                   	push   %rbx
   8:	48 83 ec 08          	sub    $0x8,%rsp
   c:	48 81 fa d0 46 bf b5 	cmp    $0xffffffffb5bf46d0,%rdx
  13:	0f                   	.byte 0xf
  14:	85                   	.byte 0x85
  15:	70                   	.byte 0x70
[   17.320696][    C3] RSP: 0018:ffffc900007875d8 EFLAGS: 00000246
[   17.320700][    C3] RAX: dffffc0000000000 RBX: 1ffff920000f0ec6 RCX: ffffc90000787ee0
[   17.320702][    C3] RDX: ffffffffb5c7a8b8 RSI: ffffc90000787718 RDI: ffff888005500040
[   17.320704][    C3] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffc90000787729
[   17.320705][    C3] R10: ffffffffb5c0c3f7 R11: ffffc90000787728 R12: ffffc90000787740
[   17.320707][    C3] R13: ffffc900007876e8 R14: ffffffffba3a19ae R15: ffffffffb5c7a8b8
[ 17.320709][ C3] ? do_group_exit (kernel/exit.c:1083) 
[ 17.320714][ C3] ? 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) 
[ 17.320718][ C3] ? do_group_exit (kernel/exit.c:1083) 
[ 17.320723][ C3] unwind_next_frame (./arch/x86/include/asm/unwind.h:111 ./arch/x86/include/asm/unwind.h:127 arch/x86/kernel/unwind_orc.c:588) 
[ 17.320726][ C3] ? do_exit (kernel/exit.c:943) 
[ 17.320731][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.320736][ C3] ? do_exit (kernel/exit.c:943) 
[ 17.320738][ C3] ? kernel_text_address (kernel/extable.c:99) 
[ 17.320743][ C3] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 17.320747][ C3] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 17.320752][ C3] ? do_group_exit (kernel/exit.c:1083) 
[ 17.320756][ C3] stack_trace_save (kernel/stacktrace.c:123) 
[ 17.320760][ C3] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 17.320764][ C3] ? stack_depot_save_flags (lib/stackdepot.c:552 lib/stackdepot.c:619) 
[ 17.320768][ C3] kasan_save_stack (mm/kasan/common.c:48) 
[ 17.320771][ C3] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 17.320774][ C3] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 17.320777][ C3] ? __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:3084) 
[ 17.320780][ C3] ? kmem_cache_free (./include/linux/kmemleak.h:49 mm/slub.c:2305 mm/slub.c:4642 mm/slub.c:4744) 
[ 17.320783][ C3] ? unlink_anon_vmas (mm/rmap.c:439) 
[ 17.320788][ C3] ? free_pgtables (mm/memory.c:392) 
[ 17.320792][ C3] ? exit_mmap (mm/mmap.c:1297) 
[ 17.320795][ C3] ? mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 17.320799][ C3] ? exit_mm (kernel/exit.c:590) 
[ 17.320801][ C3] ? do_exit (kernel/exit.c:943) 
[ 17.320804][ C3] ? unlink_anon_vmas (./include/linux/rmap.h:117 mm/rmap.c:444) 
[ 17.320807][ C3] ? 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) 
[ 17.320810][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 17.320813][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320817][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320821][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.320824][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.320828][ C3] ? debug_object_active_state (lib/debugobjects.c:1056) 
[ 17.320835][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320838][ C3] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2127 arch/x86/mm/physaddr.c:65) 
[ 17.320842][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320845][ C3] ? trace_lock_release (./include/trace/events/lock.h:69 (discriminator 21)) 
[ 17.320848][ C3] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 17.320851][ C3] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:104 ./include/linux/rcupdate.h:955 ./include/linux/mmzone.h:2127 arch/x86/mm/physaddr.c:65) 
[ 17.320853][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320857][ C3] kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 17.320860][ C3] ? __pfx_free_object_rcu (mm/kmemleak.c:524) 
[ 17.320865][ C3] __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:3084) 
[ 17.320869][ C3] kmem_cache_free (./include/linux/kmemleak.h:49 mm/slub.c:2305 mm/slub.c:4642 mm/slub.c:4744) 
[ 17.320876][ C3] ? unlink_anon_vmas (mm/rmap.c:439) 
[ 17.320880][ C3] unlink_anon_vmas (mm/rmap.c:439) 
[ 17.320883][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320888][ C3] free_pgtables (mm/memory.c:392) 
[ 17.320893][ C3] ? __pfx_free_pgtables (mm/memory.c:349) 
[ 17.320896][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 17.320898][ C3] ? exit_mmap (./include/linux/seqlock.h:431 ./include/linux/mmap_lock.h:82 ./include/linux/mmap_lock.h:129 mm/mmap.c:1292) 
[ 17.320901][ C3] ? down_write (./arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1307 kernel/locking/rwsem.c:1313 kernel/locking/rwsem.c:1578) 
[ 17.320904][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.320907][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.320911][ C3] ? trace_lock_release (./include/trace/events/lock.h:69 (discriminator 21)) 
[ 17.320914][ C3] exit_mmap (mm/mmap.c:1297) 
[ 17.320918][ C3] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 17.320920][ C3] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 17.320924][ C3] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 17.320927][ C3] ? __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) 
[ 17.320934][ C3] mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 17.320939][ C3] exit_mm (kernel/exit.c:590) 
[ 17.320942][ C3] do_exit (kernel/exit.c:943) 
[ 17.320946][ C3] do_group_exit (kernel/exit.c:1083) 
[ 17.320949][ C3] __x64_sys_exit_group (kernel/exit.c:1111) 
[ 17.320953][ C3] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 17.320956][ C3] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 17.320960][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   17.320962][    C3] RIP: 0033:0x7fe7aaff2abd
[ 17.320966][ C3] Code: Unable to access opcode bytes at 0x7fe7aaff2a93.

Code starting with the faulting instruction
===========================================
[   17.320967][    C3] RSP: 002b:00007fff518d5d78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   17.320970][    C3] RAX: ffffffffffffffda RBX: 00007fe7ab0cf9c0 RCX: 00007fe7aaff2abd
[   17.320972][    C3] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   17.320973][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000030
[   17.320975][    C3] R10: 00007fff518d5c00 R11: 0000000000000246 R12: 00007fe7ab0cf9c0


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