======================================
| [   15.018065][    C2] 1 lock held by swapper/2/0:
| [ 15.018249][ C2] #0: ffffffff959749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.018580][    C2]
| [   15.018580][    C2] stack backtrace:
[   15.018814][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.018816][    C2] Call Trace:
[   15.018818][    C2]  <IRQ>
[ 15.018820][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.018832][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.018837][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.018842][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.018848][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.018853][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.018857][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.018861][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.018866][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.018869][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.018872][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.018878][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.018880][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.018883][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.018886][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.018889][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.018892][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.018895][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.018900][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.018903][ 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) 
[ 15.018908][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.018911][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.018914][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.018916][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.018920][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.018923][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.018926][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.018929][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.018931][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.018935][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.018938][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.018941][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.018945][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.018951][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.018955][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.018959][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.018962][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.018965][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.018969][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.018973][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.018977][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.018980][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.018985][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.018989][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.018993][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.018996][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.018998][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.019002][    C2]  </IRQ>
[   15.019003][    C2]  <TASK>
[ 15.019004][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.019007][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.019011][ 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
[   15.019013][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   15.019017][    C2] RAX: 0000000000049d33 RBX: 1ffff92000028fc1 RCX: ffffffff9495ba19
[   15.019019][    C2] RDX: 0000000000000000 RSI: ffffffff95487785 RDI: ffffffff94c51260
[   15.019021][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.019022][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.019024][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.019028][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.019033][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.019035][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.019038][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.019041][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.019046][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.019050][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.019054][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.019058][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.019061][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.019067][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.034994][    C2] RCU nest depth: 0, expected: 0
| [   15.035177][    C2] INFO: lockdep is turned off.
| [   15.035370][    C2] Preemption disabled at:
| [ 15.035371][ C2] 0x0 
[   15.035703][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.035704][    C2] Call Trace:
[   15.035706][    C2]  <IRQ>
[ 15.035708][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.035714][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.035721][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.035724][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.035727][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.035731][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.035737][ 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) 
[ 15.035741][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.035744][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.035748][ 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) 
[ 15.035753][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.035756][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.035760][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.035763][ 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) 
[ 15.035768][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.035772][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.035775][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.035779][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.035783][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.035787][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.035790][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.035792][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.035795][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.035799][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.035802][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.035805][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.035810][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.035816][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.035819][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.035822][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.035825][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.035829][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.035834][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.035838][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.035842][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.035845][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.035850][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.035853][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.035858][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.035861][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.035863][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.035867][    C2]  </IRQ>
[   15.035868][    C2]  <TASK>
[ 15.035869][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.035872][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.035876][ 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
[   15.035878][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   15.035882][    C2] RAX: 0000000000049d33 RBX: 1ffff92000028fc1 RCX: ffffffff9495ba19
[   15.035884][    C2] RDX: 0000000000000000 RSI: ffffffff95487785 RDI: ffffffff94c51260
[   15.035885][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.035887][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.035889][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.035893][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.035897][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.035899][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.035902][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.035906][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.035910][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.035915][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.035919][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.035922][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.035926][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.035931][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.627088][    C1] INFO: lockdep is turned off.
| [   16.627294][    C1] Preemption disabled at:
| [ 16.627295][ C1] __slab_alloc.constprop.0 (mm/slub.c:3945) 
| [   16.627713][    C1] Tainted: [W]=WARN
[   16.627715][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.627717][    C1] Call Trace:
[   16.627719][    C1]  <IRQ>
[ 16.627721][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.627727][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 16.627733][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.627738][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.627741][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.627745][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.627752][ 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) 
[ 16.627757][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.627759][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.627764][ 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) 
[ 16.627768][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.627771][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.627776][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.627779][ 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:2366) 
[ 16.627785][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.627789][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.627792][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.627796][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.627801][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.627804][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 16.627807][ C1] ? unwind_next_frame (./include/linux/rcupdate.h:842 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 16.627811][ C1] ? __unwind_start (./arch/x86/include/asm/unwind.h:50 arch/x86/kernel/unwind_orc.c:755) 
[ 16.627815][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 16.627819][ C1] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 16.627823][ C1] ? set_track_prepare (mm/slub.c:936) 
[ 16.627825][ C1] ? ___slab_alloc (mm/slub.c:967 mm/slub.c:3848) 
[ 16.627828][ C1] ? __slab_alloc.constprop.0 (mm/slub.c:3948) 
[ 16.627831][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.627836][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.627841][ C1] __put_net (net/core/net_namespace.c:732) 
[ 16.627844][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 16.627848][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.627851][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.627856][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.627860][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.627864][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.627869][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.627873][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 16.627877][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.627880][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.627882][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.627886][    C1]  </IRQ>
[   16.627887][    C1]  <TASK>
[ 16.627888][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.627891][ C1] RIP: 0010:lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 16.627894][ C1] Code: 4d 89 f9 41 89 d8 44 89 f1 5b 44 89 ea 44 89 e6 48 89 ef 5d 41 5c 41 5d 41 5e 41 5f e9 ad fc ff ff 4c 89 14 24 e8 44 76 08 00 <4c> 8b 14 24 84 c0 0f 85 33 ff ff ff 0f b6 05 cf 26 1c 04 3c 01 0f
All code
========
   0:	4d 89 f9             	mov    %r15,%r9
   3:	41 89 d8             	mov    %ebx,%r8d
   6:	44 89 f1             	mov    %r14d,%ecx
   9:	5b                   	pop    %rbx
   a:	44 89 ea             	mov    %r13d,%edx
   d:	44 89 e6             	mov    %r12d,%esi
  10:	48 89 ef             	mov    %rbp,%rdi
  13:	5d                   	pop    %rbp
  14:	41 5c                	pop    %r12
  16:	41 5d                	pop    %r13
  18:	41 5e                	pop    %r14
  1a:	41 5f                	pop    %r15
  1c:	e9 ad fc ff ff       	jmp    0xfffffffffffffcce
  21:	4c 89 14 24          	mov    %r10,(%rsp)
  25:	e8 44 76 08 00       	call   0x8766e
  2a:*	4c 8b 14 24          	mov    (%rsp),%r10		<-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 33 ff ff ff    	jne    0xffffffffffffff69
  36:	0f b6 05 cf 26 1c 04 	movzbl 0x41c26cf(%rip),%eax        # 0x41c270c
  3d:	3c 01                	cmp    $0x1,%al
  3f:	0f                   	.byte 0xf

Code starting with the faulting instruction
===========================================
   0:	4c 8b 14 24          	mov    (%rsp),%r10
   4:	84 c0                	test   %al,%al
   6:	0f 85 33 ff ff ff    	jne    0xffffffffffffff3f
   c:	0f b6 05 cf 26 1c 04 	movzbl 0x41c26cf(%rip),%eax        # 0x41c26e2
  13:	3c 01                	cmp    $0x1,%al
  15:	0f                   	.byte 0xf
[   16.627897][    C1] RSP: 0018:ffffc900007177b0 EFLAGS: 00000282
[   16.627900][    C1] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000002
[   16.627902][    C1] RDX: 0000000000000000 RSI: ffffffff94c511e0 RDI: ffffffff954dfde8
[   16.627904][    C1] RBP: ffffffff95974ae0 R08: 0000000000000000 R09: 0000000000000000
[   16.627906][    C1] R10: ffffffff9200c3f7 R11: ffffc90000717990 R12: 0000000000000000
[   16.627908][    C1] R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
[ 16.627911][ C1] ? 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) 
[ 16.627917][ C1] ? 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) 
[ 16.627921][ C1] unwind_next_frame (./include/linux/rcupdate.h:842 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 16.627924][ C1] ? 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) 
[ 16.627928][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 16.627932][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.627936][ C1] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) 
[ 16.627939][ C1] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 16.627942][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 16.627945][ C1] ? get_stack_info_noinstr (arch/x86/kernel/dumpstack_64.c:173) 
[ 16.627951][ C1] __unwind_start (./arch/x86/include/asm/unwind.h:50 arch/x86/kernel/unwind_orc.c:755) 
[ 16.627955][ C1] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 16.627958][ C1] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 16.627963][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 16.627967][ C1] stack_trace_save (kernel/stacktrace.c:123) 
[ 16.627971][ C1] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 16.627975][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.627979][ C1] set_track_prepare (mm/slub.c:936) 
[ 16.627982][ C1] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.627986][ C1] ? get_partial_node.part.0 (mm/slub.c:2902) 
[ 16.627991][ C1] ___slab_alloc (mm/slub.c:967 mm/slub.c:3848) 
[ 16.627995][ C1] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 16.628001][ C1] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 16.628004][ C1] __slab_alloc.constprop.0 (mm/slub.c:3948) 
[ 16.628008][ C1] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 16.628011][ C1] __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 16.628016][ C1] kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 16.628020][ C1] ? exit_mmap (mm/mmap.c:1311) 
[ 16.628024][ C1] exit_mmap (mm/mmap.c:1311) 
[ 16.628028][ C1] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 16.628030][ C1] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 16.628034][ C1] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 16.628037][ C1] ? __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) 
[ 16.628045][ C1] mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 16.628050][ C1] exit_mm (kernel/exit.c:590) 
[ 16.628054][ C1] do_exit (kernel/exit.c:943) 
[ 16.628058][ C1] do_group_exit (kernel/exit.c:1083) 
[ 16.628062][ C1] __x64_sys_exit_group (kernel/exit.c:1111) 
[ 16.628065][ C1] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 16.628069][ C1] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 16.628073][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   16.628075][    C1] RIP: 0033:0x7fee5341cabd
[ 16.628078][ C1] Code: Unable to access opcode bytes at 0x7fee5341ca93.

Code starting with the faulting instruction
===========================================
[   16.628080][    C1] RSP: 002b:00007fff2fcd02e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   16.628083][    C1] RAX: ffffffffffffffda RBX: 00007fee534f99c0 RCX: 00007fee5341cabd
[   16.628084][    C1] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   16.628086][    C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000030
[   16.628088][    C1] R10: 00007fff2fcd0170 R11: 0000000000000246 R12: 00007fee534f99c0


Finger prints:
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