======================================
| [   15.766887][    C2] 1 lock held by swapper/2/0:
| [ 15.767081][ C2] #0: ffffffff9b5749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.767433][    C2]
| [   15.767433][    C2] stack backtrace:
[   15.767674][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.767676][    C2] Call Trace:
[   15.767678][    C2]  <IRQ>
[ 15.767680][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.767686][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.767692][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.767697][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.767703][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.767708][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.767712][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.767716][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.767722][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.767724][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.767727][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.767733][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.767735][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.767739][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.767742][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.767744][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.767748][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.767751][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.767756][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.767760][ 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) 
[ 15.767765][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.767768][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.767772][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.767774][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.767778][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.767781][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.767785][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.767787][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.767790][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.767795][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.767798][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.767801][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.767806][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.767812][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.767815][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.767820][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.767823][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.767827][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.767831][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.767835][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.767839][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.767842][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.767847][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.767851][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.767855][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.767858][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.767860][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.767864][    C2]  </IRQ>
[   15.767865][    C2]  <TASK>
[ 15.767867][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.767870][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.767874][ 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
[   15.767877][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   15.767880][    C2] RAX: 00000000000467b9 RBX: 1ffff92000028fc1 RCX: ffffffff9a55ba19
[   15.767882][    C2] RDX: 0000000000000000 RSI: ffffffff9b087785 RDI: ffffffff9a851260
[   15.767884][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.767886][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.767887][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.767891][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.767896][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.767899][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.767901][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.767905][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.767910][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.767915][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.767919][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.767923][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.767927][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.767932][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.784317][    C2] RCU nest depth: 0, expected: 0
| [   15.784625][    C2] INFO: lockdep is turned off.
| [   15.784820][    C2] Preemption disabled at:
| [ 15.784822][ C2] 0x0 
[   15.785159][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.785162][    C2] Call Trace:
[   15.785164][    C2]  <IRQ>
[ 15.785165][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.785173][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.785180][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.785184][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.785187][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.785191][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.785198][ 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) 
[ 15.785203][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.785205][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.785209][ 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) 
[ 15.785214][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.785217][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.785222][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.785225][ 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) 
[ 15.785230][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.785234][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.785237][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.785241][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.785245][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.785248][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.785252][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.785254][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.785257][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.785261][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.785264][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.785267][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.785271][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.785277][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.785281][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.785285][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.785288][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.785292][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.785296][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.785300][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.785304][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.785308][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.785313][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.785316][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.785321][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.785324][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.785326][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.785330][    C2]  </IRQ>
[   15.785331][    C2]  <TASK>
[ 15.785333][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.785336][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.785340][ 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
[   15.785343][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   15.785346][    C2] RAX: 00000000000467b9 RBX: 1ffff92000028fc1 RCX: ffffffff9a55ba19
[   15.785348][    C2] RDX: 0000000000000000 RSI: ffffffff9b087785 RDI: ffffffff9a851260
[   15.785350][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.785352][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.785354][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.785358][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.785363][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.785365][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.785368][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.785372][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.785376][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.785381][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.785385][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.785389][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.785393][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.785398][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.956360][    C1] INFO: lockdep is turned off.
| [   17.956516][    C1] Preemption disabled at:
| [ 17.956518][ C1] handle_softirqs (kernel/softirq.c:553) 
| [   17.956853][    C1] Tainted: [W]=WARN
[   17.956854][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.956856][    C1] Call Trace:
[   17.956858][    C1]  <TASK>
[ 17.956860][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.956868][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 17.956874][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.956878][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.956882][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.956887][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.956893][ 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) 
[ 17.956898][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.956901][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.956906][ 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) 
[ 17.956910][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.956913][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.956918][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.956921][ 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) 
[ 17.956927][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.956931][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.956935][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.956938][ C1] ? kthread (kernel/kthread.c:464) 
[ 17.956943][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.956946][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 17.956951][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 17.956956][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 17.956960][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.956964][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.956969][ C1] __put_net (net/core/net_namespace.c:732) 
[ 17.956972][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.956976][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.956979][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.956984][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.956989][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.956992][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.956998][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.957002][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 17.957006][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 17.957009][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 17.957011][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.957015][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 17.957018][ C1] kthread (kernel/kthread.c:464) 
[ 17.957022][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.957025][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 17.957027][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 17.957030][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.957033][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.957037][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.957039][ C1] ? __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