======================================
| [   20.619922][    C3] 1 lock held by swapper/3/0:
| [ 20.620142][ C3] #0: ffffffffbcb749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   20.620536][    C3]
| [   20.620536][    C3] stack backtrace:
[   20.620817][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.620819][    C3] Call Trace:
[   20.620822][    C3]  <IRQ>
[ 20.620824][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.620830][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 20.620834][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 20.620840][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.620846][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 20.620850][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 20.620854][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 20.620858][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 20.620864][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 20.620866][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 20.620869][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.620874][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 20.620876][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 20.620880][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 20.620883][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 20.620886][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 20.620889][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 20.620892][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 20.620897][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.620900][ 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) 
[ 20.620905][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.620908][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.620911][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 20.620913][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 20.620918][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.620922][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.620925][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.620927][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.620930][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.620934][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 20.620937][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.620940][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.620945][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 20.620951][ C3] __put_net (net/core/net_namespace.c:732) 
[ 20.620955][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 20.620959][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.620962][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.620967][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 20.620971][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 20.620974][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.620977][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 20.620982][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 20.620986][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 20.620991][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 20.620993][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 20.620995][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   20.620999][    C3]  </IRQ>
[   20.621000][    C3]  <TASK>
[ 20.621002][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.621004][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.621009][ C3] 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
[   20.621011][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   20.621015][    C3] RAX: 00000000000402f7 RBX: 1ffff9200002afc1 RCX: ffffffffbbb5ba19
[   20.621017][    C3] RDX: 0000000000000000 RSI: ffffffffbc687785 RDI: ffffffffbbe51260
[   20.621019][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   20.621020][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   20.621022][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 20.621026][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 20.621030][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.621033][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.621035][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.621039][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 20.621043][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 20.621048][ C3] do_idle (kernel/sched/idle.c:325) 
[ 20.621052][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.621056][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.621059][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 20.621064][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   20.639281][    C3] RCU nest depth: 0, expected: 0
| [   20.639601][    C3] INFO: lockdep is turned off.
| [   20.639801][    C3] Preemption disabled at:
| [ 20.639803][ C3] 0x0 
[   20.640174][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.640176][    C3] Call Trace:
[   20.640178][    C3]  <IRQ>
[ 20.640180][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.640187][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 20.640193][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.640197][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.640200][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 20.640205][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.640210][ 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) 
[ 20.640215][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 20.640217][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.640222][ 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) 
[ 20.640226][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.640229][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 20.640234][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.640237][ 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) 
[ 20.640242][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.640246][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.640249][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 20.640253][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 20.640257][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.640262][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.640265][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.640267][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.640270][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.640275][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 20.640278][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.640281][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.640285][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 20.640292][ C3] __put_net (net/core/net_namespace.c:732) 
[ 20.640296][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 20.640300][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.640303][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.640308][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 20.640311][ C3] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 20.640315][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.640318][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 20.640324][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 20.640328][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 20.640333][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 20.640336][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 20.640338][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   20.640342][    C3]  </IRQ>
[   20.640343][    C3]  <TASK>
[ 20.640344][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.640347][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.640351][ C3] 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
[   20.640353][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   20.640357][    C3] RAX: 00000000000402f7 RBX: 1ffff9200002afc1 RCX: ffffffffbbb5ba19
[   20.640359][    C3] RDX: 0000000000000000 RSI: ffffffffbc687785 RDI: ffffffffbbe51260
[   20.640361][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   20.640362][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   20.640364][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 20.640368][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 20.640373][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.640375][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.640378][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.640382][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 20.640386][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 20.640391][ C3] do_idle (kernel/sched/idle.c:325) 
[ 20.640395][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.640399][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.640402][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 20.640407][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   26.941167][    C3] INFO: lockdep is turned off.
| [   26.941368][    C3] Preemption disabled at:
| [ 26.941370][ C3] __slab_alloc.constprop.0 (mm/slub.c:3945) 
| [   26.941797][    C3] Tainted: [W]=WARN
[   26.941798][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   26.941801][    C3] Call Trace:
[   26.941803][    C3]  <IRQ>
[ 26.941805][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 26.941817][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 26.941824][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 26.941830][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 26.941833][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 26.941839][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 26.941847][ 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) 
[ 26.941853][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 26.941856][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 26.941861][ 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) 
[ 26.941866][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 26.941869][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 26.941875][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 26.941878][ 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) 
[ 26.941885][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 26.941891][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 26.941894][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 26.941899][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 26.941905][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 26.941910][ C3] ? __rcu_read_unlock (kernel/rcu/tree_plugin.h:441 (discriminator 2)) 
[ 26.941914][ C3] ? unwind_next_frame (./include/linux/rcupdate.h:874 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 26.941921][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 26.941925][ C3] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 26.941931][ C3] ? set_track_prepare (mm/slub.c:936) 
[ 26.941934][ C3] ? ___slab_alloc (mm/slub.c:967 mm/slub.c:3848) 
[ 26.941937][ C3] ? __slab_alloc.constprop.0 (mm/slub.c:3948) 
[ 26.941940][ C3] ? __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 26.941944][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 26.941949][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 26.941954][ C3] __put_net (net/core/net_namespace.c:732) 
[ 26.941958][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 26.941962][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 26.941965][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 26.941970][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 26.941974][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 26.941978][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 26.941985][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 26.941988][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 26.941993][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 26.941996][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 26.941998][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   26.942002][    C3]  </IRQ>
[   26.942002][    C3]  <TASK>
[ 26.942004][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 26.942007][ C3] RIP: 0010:__rcu_read_unlock (kernel/rcu/tree_plugin.h:441 (discriminator 2)) 
[ 26.942012][ C3] Code: 05 48 8d bb 04 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 <84> d2 75 41 8b 83 04 04 00 00 3d ff ff ff 3f 77 13 5b 5d 41 5c c3
All code
========
   0:	05 48 8d bb 04       	add    $0x4bb8d48,%eax
   5:	04 00                	add    $0x0,%al
   7:	00 48 b8             	add    %cl,-0x48(%rax)
   a:	00 00                	add    %al,(%rax)
   c:	00 00                	add    %al,(%rax)
   e:	00 fc                	add    %bh,%ah
  10:	ff                   	lcall  (bad)
  11:	df 48 89             	fisttps -0x77(%rax)
  14:	fa                   	cli
  15:	48 c1 ea 03          	shr    $0x3,%rdx
  19:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
  1d:	48 89 f8             	mov    %rdi,%rax
  20:	83 e0 07             	and    $0x7,%eax
  23:	83 c0 03             	add    $0x3,%eax
  26:	38 d0                	cmp    %dl,%al
  28:	7c 04                	jl     0x2e
  2a:*	84 d2                	test   %dl,%dl		<-- trapping instruction
  2c:	75 41                	jne    0x6f
  2e:	8b 83 04 04 00 00    	mov    0x404(%rbx),%eax
  34:	3d ff ff ff 3f       	cmp    $0x3fffffff,%eax
  39:	77 13                	ja     0x4e
  3b:	5b                   	pop    %rbx
  3c:	5d                   	pop    %rbp
  3d:	41 5c                	pop    %r12
  3f:	c3                   	ret

Code starting with the faulting instruction
===========================================
   0:	84 d2                	test   %dl,%dl
   2:	75 41                	jne    0x45
   4:	8b 83 04 04 00 00    	mov    0x404(%rbx),%eax
   a:	3d ff ff ff 3f       	cmp    $0x3fffffff,%eax
   f:	77 13                	ja     0x24
  11:	5b                   	pop    %rbx
  12:	5d                   	pop    %rbp
  13:	41 5c                	pop    %r12
  15:	c3                   	ret
[   26.942015][    C3] RSP: 0018:ffffc90000a97830 EFLAGS: 00000202
[   26.942019][    C3] RAX: 0000000000000007 RBX: ffff88800b272340 RCX: 0000000000000001
[   26.942021][    C3] RDX: 0000000000000000 RSI: ffffffffbbe511e0 RDI: ffff88800b272744
[   26.942023][    C3] RBP: ffff88800b272340 R08: 0000000000000000 R09: ffffc90000a97991
[   26.942025][    C3] R10: ffffffffb920c3f7 R11: ffffc90000a97990 R12: ffff88800b272340
[   26.942027][    C3] R13: ffffc90000a97950 R14: ffffc90000a90000 R15: ffffc90000a97f28
[ 26.942030][ 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) 
[ 26.942037][ C3] unwind_next_frame (./include/linux/rcupdate.h:874 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 26.942040][ C3] ? x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 26.942048][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 26.942051][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 26.942056][ C3] ? x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 26.942058][ C3] ? kernel_text_address (kernel/extable.c:99) 
[ 26.942065][ C3] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 26.942069][ C3] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 26.942073][ C3] ? do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 26.942078][ C3] stack_trace_save (kernel/stacktrace.c:123) 
[ 26.942081][ C3] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 26.942086][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 26.942090][ C3] set_track_prepare (mm/slub.c:936) 
[ 26.942092][ C3] ? __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 26.942096][ C3] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 26.942101][ C3] ? exit_mmap (mm/mmap.c:1311) 
[ 26.942105][ C3] ? mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 26.942111][ C3] ? exit_mm (kernel/exit.c:590) 
[ 26.942114][ C3] ? do_exit (kernel/exit.c:943) 
[ 26.942117][ C3] ? do_group_exit (kernel/exit.c:1083) 
[ 26.942120][ C3] ? __x64_sys_exit_group (kernel/exit.c:1111) 
[ 26.942123][ C3] ? x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 26.942127][ C3] ___slab_alloc (mm/slub.c:967 mm/slub.c:3848) 
[ 26.942131][ C3] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 26.942135][ C3] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 26.942139][ C3] __slab_alloc.constprop.0 (mm/slub.c:3948) 
[ 26.942143][ C3] ? kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 26.942146][ C3] __kmalloc_cache_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4353) 
[ 26.942152][ C3] kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 26.942155][ C3] ? exit_mmap (mm/mmap.c:1311) 
[ 26.942159][ C3] exit_mmap (mm/mmap.c:1311) 
[ 26.942162][ C3] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 26.942165][ C3] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 26.942169][ C3] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 26.942172][ 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) 
[ 26.942180][ C3] mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 26.942184][ C3] exit_mm (kernel/exit.c:590) 
[ 26.942187][ C3] do_exit (kernel/exit.c:943) 
[ 26.942191][ C3] do_group_exit (kernel/exit.c:1083) 
[ 26.942195][ C3] __x64_sys_exit_group (kernel/exit.c:1111) 
[ 26.942198][ C3] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 26.942201][ C3] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 26.942204][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   26.942206][    C3] RIP: 0033:0x7f22ea26babd
[ 26.942210][ C3] Code: Unable to access opcode bytes at 0x7f22ea26ba93.

Code starting with the faulting instruction
===========================================
[   26.942212][    C3] RSP: 002b:00007ffd99a7f598 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   26.942215][    C3] RAX: ffffffffffffffda RBX: 00007f22ea3489c0 RCX: 00007f22ea26babd
[   26.942217][    C3] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   26.942218][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020
[   26.942220][    C3] R10: 00007ffd99a7f440 R11: 0000000000000246 R12: 00007f22ea3489c0


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