======================================
| [   15.503292][    C2] 1 lock held by swapper/2/0:
| [ 15.503480][ C2] #0: ffffffffb4f749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.503819][    C2]
| [   15.503819][    C2] stack backtrace:
[   15.504059][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.504061][    C2] Call Trace:
[   15.504062][    C2]  <IRQ>
[ 15.504065][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.504071][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.504077][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.504082][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.504087][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.504092][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.504096][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.504100][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.504105][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.504108][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.504112][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.504117][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.504119][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.504123][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.504126][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.504129][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.504132][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.504135][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.504141][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.504144][ 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) 
[ 15.504149][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.504152][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.504155][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.504157][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.504162][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.504165][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.504168][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.504171][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.504173][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.504178][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.504181][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.504184][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.504189][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.504196][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.504199][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.504203][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.504206][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.504210][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.504214][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.504218][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.504221][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.504225][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.504230][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.504233][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.504238][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.504241][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.504243][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.504247][    C2]  </IRQ>
[   15.504248][    C2]  <TASK>
[ 15.504249][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.504252][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.504256][ 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
[   15.504259][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   15.504262][    C2] RAX: 0000000000048937 RBX: 1ffff92000028fc1 RCX: ffffffffb3f5ba19
[   15.504264][    C2] RDX: 0000000000000000 RSI: ffffffffb4a87785 RDI: ffffffffb4251260
[   15.504266][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.504267][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.504269][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.504273][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.504278][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.504280][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.504282][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.504286][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.504291][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.504296][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.504300][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.504303][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.504307][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.504312][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.520138][    C2] RCU nest depth: 0, expected: 0
| [   15.520336][    C2] INFO: lockdep is turned off.
| [   15.520521][    C2] Preemption disabled at:
| [ 15.520522][ C2] 0x0 
[   15.520856][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.520858][    C2] Call Trace:
[   15.520860][    C2]  <IRQ>
[ 15.520862][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.520869][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.520875][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.520880][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.520883][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.520887][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.520893][ 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) 
[ 15.520898][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.520901][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.520904][ 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) 
[ 15.520909][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.520912][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.520918][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.520921][ 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) 
[ 15.520925][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.520930][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.520933][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.520936][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.520941][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.520944][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.520947][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.520949][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.520952][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.520957][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.520960][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.520963][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.520967][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.520979][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.520984][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.520991][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.520995][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.520999][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.521003][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.521007][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.521012][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.521016][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.521020][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.521024][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.521029][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.521032][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.521034][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.521038][    C2]  </IRQ>
[   15.521039][    C2]  <TASK>
[ 15.521040][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.521043][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.521047][ 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
[   15.521050][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   15.521053][    C2] RAX: 0000000000048937 RBX: 1ffff92000028fc1 RCX: ffffffffb3f5ba19
[   15.521055][    C2] RDX: 0000000000000000 RSI: ffffffffb4a87785 RDI: ffffffffb4251260
[   15.521057][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.521059][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.521061][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.521065][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.521069][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.521072][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.521074][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.521078][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.521083][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.521088][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.521092][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.521095][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.521099][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.521104][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.237169][    C2] INFO: lockdep is turned off.
| [   17.237380][    C2] Preemption disabled at:
| [ 17.237381][ C2] handle_softirqs (kernel/softirq.c:553) 
| [   17.237814][    C2] Tainted: [W]=WARN
[   17.237815][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.237818][    C2] Call Trace:
[   17.237820][    C2]  <IRQ>
[ 17.237821][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.237828][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 17.237834][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.237839][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.237842][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.237847][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.237853][ 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) 
[ 17.237858][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.237861][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.237865][ 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) 
[ 17.237870][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.237873][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.237878][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.237881][ 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) 
[ 17.237887][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.237891][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.237894][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.237896][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.237902][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.237905][ C2] ? __orc_find (arch/x86/kernel/unwind_orc.c:100) 
[ 17.237910][ C2] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:495) 
[ 17.237913][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 17.237917][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 17.237921][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 17.237926][ C2] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 17.237930][ C2] ? kmem_cache_free (mm/slub.c:2343 mm/slub.c:4642 mm/slub.c:4744) 
[ 17.237934][ C2] ? exit_mmap (mm/mmap.c:1311) 
[ 17.237938][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.237942][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.237947][ C2] __put_net (net/core/net_namespace.c:732) 
[ 17.237951][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.237955][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.237958][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.237961][ C2] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 17.237965][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.237975][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.237981][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.237986][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.237993][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.237997][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 17.238002][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.238004][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.238007][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.238011][    C2]  </IRQ>
[   17.238012][    C2]  <TASK>
[ 17.238013][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.238016][ C2] RIP: 0010:__orc_find (arch/x86/kernel/unwind_orc.c:100) 
[ 17.238020][ C2] Code: ff df 49 89 ff 48 89 fd eb 0c 48 8d 6b 04 49 89 df 4c 39 e5 77 4e 4c 89 e2 48 29 ea 48 89 d6 48 c1 ea 3f 48 c1 fe 02 48 01 f2 <48> d1 fa 48 8d 5c 95 00 48 89 da 48 c1 ea 03 0f b6 34 0a 48 89 da
All code
========
   0:	ff                   	lcall  (bad)
   1:	df 49 89             	fisttps -0x77(%rcx)
   4:	ff 48 89             	decl   -0x77(%rax)
   7:	fd                   	std
   8:	eb 0c                	jmp    0x16
   a:	48 8d 6b 04          	lea    0x4(%rbx),%rbp
   e:	49 89 df             	mov    %rbx,%r15
  11:	4c 39 e5             	cmp    %r12,%rbp
  14:	77 4e                	ja     0x64
  16:	4c 89 e2             	mov    %r12,%rdx
  19:	48 29 ea             	sub    %rbp,%rdx
  1c:	48 89 d6             	mov    %rdx,%rsi
  1f:	48 c1 ea 3f          	shr    $0x3f,%rdx
  23:	48 c1 fe 02          	sar    $0x2,%rsi
  27:	48 01 f2             	add    %rsi,%rdx
  2a:*	48 d1 fa             	sar    $1,%rdx		<-- trapping instruction
  2d:	48 8d 5c 95 00       	lea    0x0(%rbp,%rdx,4),%rbx
  32:	48 89 da             	mov    %rbx,%rdx
  35:	48 c1 ea 03          	shr    $0x3,%rdx
  39:	0f b6 34 0a          	movzbl (%rdx,%rcx,1),%esi
  3d:	48 89 da             	mov    %rbx,%rdx

Code starting with the faulting instruction
===========================================
   0:	48 d1 fa             	sar    $1,%rdx
   3:	48 8d 5c 95 00       	lea    0x0(%rbp,%rdx,4),%rbx
   8:	48 89 da             	mov    %rbx,%rdx
   b:	48 c1 ea 03          	shr    $0x3,%rdx
   f:	0f b6 34 0a          	movzbl (%rdx,%rcx,1),%esi
  13:	48 89 da             	mov    %rbx,%rdx
[   17.238023][    C2] RSP: 0018:ffffc90000a07798 EFLAGS: 00000202
[   17.238027][    C2] RAX: ffffffffb5da1a2c RBX: ffffffffb5a69340 RCX: dffffc0000000000
[   17.238029][    C2] RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffffffffb5a69334
[   17.238031][    C2] RBP: ffffffffb5a69344 R08: 0000000000000000 R09: ffffc90000a07919
[   17.238033][    C2] R10: ffffffffb160c3f7 R11: ffffc90000a07918 R12: ffffffffb5a6934c
[   17.238035][    C2] R13: ffffffffb167aaad R14: ffffffffb5a69334 R15: ffffffffb5a69340
[ 17.238037][ C2] ? __x64_sys_exit_group (kernel/exit.c:1113 kernel/exit.c:1111 kernel/exit.c:1111) 
[ 17.238042][ C2] ? unwind_next_frame (./include/linux/rcupdate.h:331 ./include/linux/rcupdate.h:841 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 17.238049][ C2] unwind_next_frame (arch/x86/kernel/unwind_orc.c:495) 
[ 17.238053][ C2] ? __x64_sys_exit_group (kernel/exit.c:1111) 
[ 17.238057][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.238062][ C2] ? __x64_sys_exit_group (kernel/exit.c:1111) 
[ 17.238065][ C2] ? kernel_text_address (kernel/extable.c:99) 
[ 17.238070][ C2] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 17.238075][ C2] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 17.238079][ C2] ? __x64_sys_exit_group (kernel/exit.c:1111) 
[ 17.238084][ C2] stack_trace_save (kernel/stacktrace.c:123) 
[ 17.238087][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 17.238092][ C2] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 17.238095][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 17.238098][ C2] kasan_save_stack (mm/kasan/common.c:48) 
[ 17.238101][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 17.238104][ C2] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 17.238107][ C2] ? kmem_cache_free (mm/slub.c:2343 mm/slub.c:4642 mm/slub.c:4744) 
[ 17.238110][ C2] ? exit_mmap (mm/mmap.c:1311) 
[ 17.238112][ C2] ? mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 17.238116][ C2] ? exit_mm (kernel/exit.c:590) 
[ 17.238119][ C2] ? do_exit (kernel/exit.c:943) 
[ 17.238121][ C2] ? do_group_exit (kernel/exit.c:1083) 
[ 17.238124][ C2] ? __x64_sys_exit_group (kernel/exit.c:1111) 
[ 17.238127][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 17.238130][ C2] ? stack_depot_save_flags (lib/stackdepot.c:552 lib/stackdepot.c:619) 
[ 17.238135][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 17.238139][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 17.238141][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.238146][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.238149][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.238153][ C2] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2127 arch/x86/mm/physaddr.c:65) 
[ 17.238156][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.238160][ C2] ? trace_lock_release (./include/trace/events/lock.h:69 (discriminator 21)) 
[ 17.238164][ C2] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 17.238166][ C2] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:104 ./include/linux/rcupdate.h:955 ./include/linux/mmzone.h:2127 arch/x86/mm/physaddr.c:65) 
[ 17.238170][ C2] kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 17.238173][ C2] kmem_cache_free (mm/slub.c:2343 mm/slub.c:4642 mm/slub.c:4744) 
[ 17.238177][ C2] ? exit_mmap (mm/mmap.c:1311) 
[ 17.238181][ C2] exit_mmap (mm/mmap.c:1311) 
[ 17.238184][ C2] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 17.238187][ C2] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 17.238190][ C2] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 17.238193][ C2] ? __mutex_unlock_slowpath (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4329 ./include/linux/atomic/atomic-long.h:1506 ./include/linux/atomic/atomic-instrumented.h:4481 kernel/locking/mutex.c:924) 
[ 17.238201][ C2] mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 17.238205][ C2] exit_mm (kernel/exit.c:590) 
[ 17.238208][ C2] do_exit (kernel/exit.c:943) 
[ 17.238212][ C2] do_group_exit (kernel/exit.c:1083) 
[ 17.238216][ C2] __x64_sys_exit_group (kernel/exit.c:1111) 
[ 17.238219][ C2] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 17.238223][ C2] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 17.238226][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   17.238229][    C2] RIP: 0033:0x7f855f8aaabd
[ 17.238232][ C2] Code: Unable to access opcode bytes at 0x7f855f8aaa93.

Code starting with the faulting instruction
===========================================
[   17.238233][    C2] RSP: 002b:00007ffcdd1b7548 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   17.238236][    C2] RAX: ffffffffffffffda RBX: 00007f855f9879c0 RCX: 00007f855f8aaabd
[   17.238238][    C2] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   17.238240][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020
[   17.238242][    C2] R10: 00007ffcdd1b73f0 R11: 0000000000000246 R12: 00007f855f9879c0


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