======================================
| [   16.290179][    C2] 1 lock held by swapper/2/0:
| [ 16.290372][ C2] #0: ffffffffa07749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   16.290727][    C2]
| [   16.290727][    C2] stack backtrace:
[   16.290968][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.290971][    C2] Call Trace:
[   16.290973][    C2]  <IRQ>
[ 16.290975][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.290983][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 16.290997][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 16.291003][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.291010][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 16.291015][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 16.291020][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 16.291023][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 16.291029][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 16.291032][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.291036][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.291042][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 16.291044][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.291048][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.291051][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.291053][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 16.291056][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.291061][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.291066][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.291070][ 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) 
[ 16.291076][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.291079][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.291082][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.291085][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.291090][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.291095][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.291098][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.291101][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.291103][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.291110][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.291113][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.291116][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.291122][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.291130][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.291134][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 16.291138][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.291142][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.291146][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 16.291150][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.291154][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.291158][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.291161][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.291166][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.291170][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.291175][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.291178][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.291180][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.291183][    C2]  </IRQ>
[   16.291185][    C2]  <TASK>
[ 16.291186][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.291189][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.291193][ 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
[   16.291197][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.291200][    C2] RAX: 0000000000042aa3 RBX: 1ffff92000028fc1 RCX: ffffffff9f75ba19
[   16.291202][    C2] RDX: 0000000000000000 RSI: ffffffffa0287785 RDI: ffffffff9fa51260
[   16.291204][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   16.291206][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   16.291208][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 16.291212][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.291217][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.291219][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.291222][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.291226][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.291230][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.291235][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.291239][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.291243][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.291247][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.291252][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.308264][    C2] RCU nest depth: 0, expected: 0
| [   16.308474][    C2] INFO: lockdep is turned off.
| [   16.308661][    C2] Preemption disabled at:
| [ 16.308663][ C2] 0x0 
[   16.309002][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.309004][    C2] Call Trace:
[   16.309005][    C2]  <IRQ>
[ 16.309008][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.309017][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 16.309024][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.309029][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.309033][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.309038][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.309046][ 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) 
[ 16.309051][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.309054][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.309060][ 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) 
[ 16.309064][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.309067][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.309074][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.309077][ 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) 
[ 16.309084][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.309089][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.309092][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.309097][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.309102][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.309106][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.309109][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.309111][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.309114][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.309120][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.309123][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.309126][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.309132][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.309144][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.309149][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 16.309155][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.309161][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.309167][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 16.309172][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.309176][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.309181][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.309185][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.309190][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.309194][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.309199][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.309202][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.309204][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.309208][    C2]  </IRQ>
[   16.309209][    C2]  <TASK>
[ 16.309210][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.309213][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.309217][ 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
[   16.309220][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.309224][    C2] RAX: 0000000000042aa3 RBX: 1ffff92000028fc1 RCX: ffffffff9f75ba19
[   16.309226][    C2] RDX: 0000000000000000 RSI: ffffffffa0287785 RDI: ffffffff9fa51260
[   16.309228][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   16.309230][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   16.309231][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 16.309235][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.309240][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.309242][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.309245][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.309249][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.309253][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.309258][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.309262][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.309265][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.309269][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.309274][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   18.098947][    C1] INFO: lockdep is turned off.
| [   18.099154][    C1] Preemption disabled at:
| [ 18.099156][ C1] __slab_alloc.constprop.0 (mm/slub.c:3945) 
| [   18.099593][    C1] Tainted: [W]=WARN
[   18.099595][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.099597][    C1] Call Trace:
[   18.099599][    C1]  <IRQ>
[ 18.099601][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.099611][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 18.099618][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.099623][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.099627][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 18.099633][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.099640][ 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) 
[ 18.099646][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 18.099649][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.099654][ 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) 
[ 18.099659][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.099662][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.099668][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.099671][ 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) 
[ 18.099678][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.099683][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.099686][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.099692][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 18.099698][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.099702][ C1] ? __x86_indirect_its_thunk_r15 (arch/x86/lib/retpoline.S:411) 
[ 18.099707][ C1] ? unwind_next_frame (./include/linux/rcupdate.h:873 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 18.099713][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 18.099718][ C1] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 18.099724][ C1] ? set_track_prepare (mm/slub.c:936) 
[ 18.099727][ C1] ? ___slab_alloc (mm/slub.c:967 mm/slub.c:3848) 
[ 18.099730][ C1] ? __slab_alloc.constprop.0 (mm/slub.c:3948) 
[ 18.099733][ C1] ? __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 18.099736][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.099741][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.099746][ C1] __put_net (net/core/net_namespace.c:732) 
[ 18.099751][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 18.099755][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.099757][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.099763][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.099767][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.099770][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.099777][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.099782][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 18.099786][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.099789][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.099791][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   18.099795][    C1]  </IRQ>
[   18.099796][    C1]  <TASK>
[ 18.099797][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.099800][ C1] RIP: 0010:its_return_thunk (arch/x86/lib/retpoline.S:411) 
[ 18.099804][ C1] Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <c3> cc 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 e9 bb 1a 33 fd cc
All code
========
   0:	cc                   	int3
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	cc                   	int3
  12:	cc                   	int3
  13:	cc                   	int3
  14:	cc                   	int3
  15:	cc                   	int3
  16:	cc                   	int3
  17:	cc                   	int3
  18:	cc                   	int3
  19:	cc                   	int3
  1a:	cc                   	int3
  1b:	cc                   	int3
  1c:	cc                   	int3
  1d:	cc                   	int3
  1e:	cc                   	int3
  1f:	cc                   	int3
  20:	cc                   	int3
  21:	cc                   	int3
  22:	cc                   	int3
  23:	cc                   	int3
  24:	cc                   	int3
  25:	cc                   	int3
  26:	cc                   	int3
  27:	cc                   	int3
  28:	cc                   	int3
  29:	cc                   	int3
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  33:	00 00 00 00 
  37:	0f 1f 00             	nopl   (%rax)
  3a:	e9 bb 1a 33 fd       	jmp    0xfffffffffd331afa
  3f:	cc                   	int3

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	cc                   	int3
   2:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   9:	00 00 00 00 
   d:	0f 1f 00             	nopl   (%rax)
  10:	e9 bb 1a 33 fd       	jmp    0xfffffffffd331ad0
  15:	cc                   	int3
[   18.099807][    C1] RSP: 0018:ffffc90000a47848 EFLAGS: 00000246
[   18.099811][    C1] RAX: 0000000000000001 RBX: 1ffff92000148f13 RCX: ffffc90000a48001
[   18.099814][    C1] RDX: 0000000000000000 RSI: ffffffff9fa511e0 RDI: ffffffffa02dfde8
[   18.099815][    C1] RBP: ffffc90000a47f58 R08: 0000000000000000 R09: ffffc90000a47991
[   18.099817][    C1] R10: ffffffff9ce0c3f7 R11: ffffc90000a47990 R12: 0000000000000001
[   18.099819][    C1] R13: ffffc90000a47950 R14: ffffc90000a40000 R15: ffffc90000a47f50
[ 18.099822][ 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) 
[ 18.099828][ C1] unwind_next_frame (./include/linux/rcupdate.h:873 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 18.099832][ C1] ? do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 18.099836][ C1] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 18.099839][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 18.099843][ C1] ? do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 18.099845][ C1] ? kernel_text_address (kernel/extable.c:99) 
[ 18.099852][ C1] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 18.099856][ C1] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 18.099860][ C1] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 18.099865][ C1] stack_trace_save (kernel/stacktrace.c:123) 
[ 18.099868][ C1] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 18.099873][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.099877][ C1] set_track_prepare (mm/slub.c:936) 
[ 18.099879][ C1] ? __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 18.099883][ C1] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 18.099888][ C1] ? exit_mmap (mm/mmap.c:1311) 
[ 18.099892][ C1] ? mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 18.099897][ C1] ? exit_mm (kernel/exit.c:590) 
[ 18.099901][ C1] ? do_exit (kernel/exit.c:943) 
[ 18.099904][ C1] ? do_group_exit (kernel/exit.c:1083) 
[ 18.099907][ C1] ? __x64_sys_exit_group (kernel/exit.c:1111) 
[ 18.099909][ C1] ? x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 18.099916][ C1] ? do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 18.099919][ C1] ___slab_alloc (mm/slub.c:967 mm/slub.c:3848) 
[ 18.099923][ C1] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 18.099928][ C1] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 18.099931][ C1] __slab_alloc.constprop.0 (mm/slub.c:3948) 
[ 18.099935][ C1] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 18.099939][ C1] __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 18.099944][ C1] kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 18.099947][ C1] ? exit_mmap (mm/mmap.c:1311) 
[ 18.099951][ C1] exit_mmap (mm/mmap.c:1311) 
[ 18.099955][ C1] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 18.099957][ C1] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 18.099962][ C1] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 18.099965][ 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) 
[ 18.099973][ C1] mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 18.099977][ C1] exit_mm (kernel/exit.c:590) 
[ 18.099980][ C1] do_exit (kernel/exit.c:943) 
[ 18.099985][ C1] do_group_exit (kernel/exit.c:1083) 
[ 18.099988][ C1] __x64_sys_exit_group (kernel/exit.c:1111) 
[ 18.099992][ C1] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 18.099994][ C1] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 18.099997][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   18.100000][    C1] RIP: 0033:0x7f1389010abd
[ 18.100004][ C1] Code: Unable to access opcode bytes at 0x7f1389010a93.

Code starting with the faulting instruction
===========================================
[   18.100005][    C1] RSP: 002b:00007ffee0e41268 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   18.100008][    C1] RAX: ffffffffffffffda RBX: 00007f13890ed9c0 RCX: 00007f1389010abd
[   18.100010][    C1] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   18.100012][    C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000030
[   18.100013][    C1] R10: 00007ffee0e410f0 R11: 0000000000000246 R12: 00007f13890ed9c0


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