======================================
| xx__-> [   31.681510][  T385] netem: version 1.3
| [   86.651946][    C1] ------------[ cut here ]------------
| [   86.652538][    C1] WARNING: CPU: 1 PID: 0 at ./include/net/sch_generic.h:843 netem_dequeue (./include/net/sch_generic.h:843 ./include/net/sch_generic.h:889 ./include/net/sch_generic.h:901 net/sched/sch_netem.c:712) sch_netem
| [   86.653154][    C1] Modules linked in: sch_netem
[   86.654063][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   86.654429][    C1] RIP: 0010:netem_dequeue (./include/net/sch_generic.h:843 ./include/net/sch_generic.h:889 ./include/net/sch_generic.h:901 net/sched/sch_netem.c:712) sch_netem
[   86.654822][    C1] Code: 7d 06 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 89 09 00 00 66 83 7d 06 00 74 04 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 4c 89 d2 48 c1 ea 03 0f b6
All code
========
   0:	7d 06                	jge    0x8
   2:	48 89 fa             	mov    %rdi,%rdx
   5:	48 c1 ea 03          	shr    $0x3,%rdx
   9:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   d:	48 89 f8             	mov    %rdi,%rax
  10:	83 e0 07             	and    $0x7,%eax
  13:	83 c0 01             	add    $0x1,%eax
  16:	38 d0                	cmp    %dl,%al
  18:	7c 08                	jl     0x22
  1a:	84 d2                	test   %dl,%dl
  1c:	0f 85 89 09 00 00    	jne    0x9ab
  22:	66 83 7d 06 00       	cmpw   $0x0,0x6(%rbp)
  27:	74 04                	je     0x2d
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  34:	fc ff df 
  37:	4c 89 d2             	mov    %r10,%rdx
  3a:	48 c1 ea 03          	shr    $0x3,%rdx
  3e:	0f                   	.byte 0xf
  3f:	b6                   	.byte 0xb6

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   a:	fc ff df 
   d:	4c 89 d2             	mov    %r10,%rdx
  10:	48 c1 ea 03          	shr    $0x3,%rdx
  14:	0f                   	.byte 0xf
  15:	b6                   	.byte 0xb6
[   86.655879][    C1] RSP: 0018:ffffc900001c0d10 EFLAGS: 00010202
[   86.656263][    C1] RAX: 0000000000000007 RBX: ffff8880054fb400 RCX: 0000000000000017
[   86.656741][    C1] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880114e2f06
[   86.657180][    C1] RBP: ffff8880114e2f00 R08: 00000014520ceffa R09: 0000000000000001
[   86.657642][    C1] R10: ffff8880114dcc48 R11: ffffffffa5da2008 R12: 0000000000000001
[   86.658080][    C1] R13: dffffc0000000000 R14: ffff8880114dcc20 R15: ffff8880114dcc20
[   86.658513][    C1] FS:  0000000000000000(0000) GS:ffff888091003000(0000) knlGS:0000000000000000
[   86.659039][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   86.659411][    C1] CR2: 00000000313b3008 CR3: 000000000e3ee006 CR4: 0000000000772ef0
[   86.659868][    C1] PKRU: 55555554
[   86.660093][    C1] Call Trace:
[   86.660318][    C1]  <IRQ>
[   86.660478][    C1]  ? get_slot_next (net/sched/sch_netem.c:703) sch_netem
[   86.660863][    C1]  ? validate_chain (kernel/locking/lockdep.c:3801 kernel/locking/lockdep.c:3821 kernel/locking/lockdep.c:3876)
[   86.661192][    C1]  dequeue_skb (net/sched/sch_generic.c:297)
[   86.661766][    C1]  __qdisc_run (net/sched/sch_generic.c:403 net/sched/sch_generic.c:420)
[   86.662067][    C1]  ? sch_direct_xmit (net/sched/sch_generic.c:416)
[   86.662357][    C1]  ? 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)
[   86.662665][    C1]  ? spin_bug (kernel/locking/spinlock_debug.c:114)
[   86.662886][    C1]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[   86.663175][    C1]  ? net_tx_action (./include/linux/spinlock.h:352 net/core/dev.c:5767)
[   86.663481][    C1]  net_tx_action (./include/net/sch_generic.h:223 ./include/net/pkt_sched.h:121 ./include/net/pkt_sched.h:117 net/core/dev.c:5783)
[   86.663790][    C1]  handle_softirqs (kernel/softirq.c:623)
[   86.664098][    C1]  irq_exit_rcu (kernel/softirq.c:657 kernel/softirq.c:496 kernel/softirq.c:723 kernel/softirq.c:739)
[   86.664385][    C1]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1052 arch/x86/kernel/apic/apic.c:1052)
[   86.664701][    C1]  </IRQ>
[   86.664852][    C1]  <TASK>
[   86.664998][    C1]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:697)
[   86.665367][    C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82)
[   86.665678][    C1] Code: 48 8b 3d d4 8a 26 02 e8 1f 00 00 00 48 2b 05 08 45 a0 00 c3 0f 1f 80 00 00 00 00 f3 0f 1e fa eb 07 0f 00 2d 33 bc 25 00 fb f4 <c3> 0f 1f 40 d6 41 54 55 53 48 89 fb 48 83 ec 10 8b 17 83 e2 fe 41
All code
========
   0:	48 8b 3d d4 8a 26 02 	mov    0x2268ad4(%rip),%rdi        # 0x2268adb
   7:	e8 1f 00 00 00       	call   0x2b
   c:	48 2b 05 08 45 a0 00 	sub    0xa04508(%rip),%rax        # 0xa0451b
  13:	c3                   	ret
  14:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  1b:	f3 0f 1e fa          	endbr64
  1f:	eb 07                	jmp    0x28
  21:	0f 00 2d 33 bc 25 00 	verw   0x25bc33(%rip)        # 0x25bc5b
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	0f 1f 40 d6          	nopl   -0x2a(%rax)
  2f:	41 54                	push   %r12
  31:	55                   	push   %rbp
  32:	53                   	push   %rbx
  33:	48 89 fb             	mov    %rdi,%rbx
  36:	48 83 ec 10          	sub    $0x10,%rsp
  3a:	8b 17                	mov    (%rdi),%edx
  3c:	83 e2 fe             	and    $0xfffffffe,%edx
  3f:	41                   	rex.B

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	0f 1f 40 d6          	nopl   -0x2a(%rax)
   5:	41 54                	push   %r12
   7:	55                   	push   %rbp
   8:	53                   	push   %rbx
   9:	48 89 fb             	mov    %rdi,%rbx
   c:	48 83 ec 10          	sub    $0x10,%rsp
  10:	8b 17                	mov    (%rdi),%edx
  12:	83 e2 fe             	and    $0xfffffffe,%edx
  15:	41                   	rex.B
[   86.666733][    C1] RSP: 0018:ffffc90000137dd8 EFLAGS: 00000202
[   86.667106][    C1] RAX: 00000000003a4b5d RBX: 1ffff92000026fbf RCX: ffffffffa3039225
[   86.667553][    C1] RDX: 0000000000000000 RSI: ffffffffa39a1299 RDI: ffffffffa345d640
[   86.668010][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c56252
[   86.668451][    C1] R10: ffff8880362b1293 R11: ffff8880362b6c18 R12: 0000000000000000
[   86.668905][    C1] R13: ffff888001b38040 R14: dffffc0000000000 R15: 0000000000000000
[   86.669348][    C1]  ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146)
[   86.669738][    C1]  default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:767)
[   86.669958][    C1]  default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:123)
[   86.670253][    C1]  cpuidle_idle_call (kernel/sched/idle.c:191)
[   86.670549][    C1]  ? arch_cpu_idle_exit+0x40/0x40
[   86.670855][    C1]  ? trace_sched_exit_tp (./arch/x86/include/asm/bitops.h:222 ./arch/x86/include/asm/bitops.h:233 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/cpumask.h:646 ./include/linux/cpumask.h:1205 ./include/trace/events/sched.h:886)
[   86.671163][    C1]  ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60)
[   86.671470][    C1]  do_idle (kernel/sched/idle.c:330)
[   86.671705][    C1]  cpu_startup_entry (kernel/sched/idle.c:427 (discriminator 1))
[   86.671997][    C1]  start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283)
[   86.672288][    C1]  ? set_cpu_sibling_map (arch/x86/kernel/smpboot.c:233)


Finger prints:
netem_dequeue:dequeue_skb:__qdisc_run:net_tx_action:handle_softirqs