======================================
| [   20.012526][  T303] netem: version 1.3
| [   21.637811][    C2] ------------[ cut here ]------------
| [   21.638347][    C2] WARNING: CPU: 2 PID: 317 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
| [   21.639036][    C2] Modules linked in: sch_netem
[   21.640147][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.640584][    C2] 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
[   21.641045][    C2] 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
[   21.642253][    C2] RSP: 0018:ffffc90000218d18 EFLAGS: 00010202
[   21.642700][    C2] RAX: 0000000000000007 RBX: ffff88800ffb6400 RCX: 0000000000000017
[   21.643211][    C2] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888004f1cc06
[   21.643739][    C2] RBP: ffff888004f1cc00 R08: 000000052db6efda R09: 0000000000000001
[   21.644253][    C2] R10: ffff888004f28148 R11: ffffffffaa5a2008 R12: 0000000000000001
[   21.644773][    C2] R13: dffffc0000000000 R14: ffff888004f28120 R15: ffff888004f28120
[   21.645391][    C2] FS:  00007f0c89586b80(0000) GS:ffff88808c883000(0000) knlGS:0000000000000000
[   21.646017][    C2] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   21.646452][    C2] CR2: 0000000039daa008 CR3: 0000000010b83004 CR4: 0000000000772ef0
[   21.646983][    C2] PKRU: 55555554
[   21.647254][    C2] Call Trace:
[   21.647537][    C2]  <IRQ>
[   21.647747][    C2]  ? get_slot_next (net/sched/sch_netem.c:703) sch_netem
[   21.648178][    C2]  ? skb_defer_free_flush (net/core/dev.c:6786)
[   21.648536][    C2]  ? __napi_poll.constprop.0 (net/core/dev.c:7673)
[   21.648899][    C2]  dequeue_skb (net/sched/sch_generic.c:297)
[   21.649262][    C2]  __qdisc_run (net/sched/sch_generic.c:403 net/sched/sch_generic.c:420)
[   21.649621][    C2]  ? sch_direct_xmit (net/sched/sch_generic.c:416)
[   21.649971][    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)
[   21.650318][    C2]  ? spin_bug (kernel/locking/spinlock_debug.c:114)
[   21.650594][    C2]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[   21.650943][    C2]  ? net_tx_action (./include/linux/spinlock.h:352 net/core/dev.c:5767)
[   21.651301][    C2]  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)
[   21.651664][    C2]  handle_softirqs (kernel/softirq.c:623)
[   21.652023][    C2]  ? __neigh_event_send (./include/linux/bottom_half.h:33 net/core/neighbour.c:1273)
[   21.652372][    C2]  do_softirq (kernel/softirq.c:523 kernel/softirq.c:510)
[   21.652647][    C2]  </IRQ>
[   21.652845][    C2]  <TASK>
[   21.653031][    C2]  __local_bh_enable_ip (kernel/softirq.c:450)
[   21.653382][    C2]  __neigh_event_send (net/core/neighbour.c:1274)
[   21.653761][    C2]  neigh_resolve_output (net/core/neighbour.c:1578)
[   21.654107][    C2]  ? ___neigh_create (net/core/neighbour.c:727)
[   21.654457][    C2]  ip_finish_output2 (./include/net/neighbour.h:556 net/ipv4/ip_output.c:237)
[   21.654823][    C2]  ? ip_skb_dst_mtu (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/ip.h:504 ./include/net/ip.h:518)
[   21.655168][    C2]  ? ip_append_data.part.0 (net/ipv4/ip_output.c:201)
[   21.655534][    C2]  ? ip_skb_dst_mtu (./include/net/ip.h:523)
[   21.655889][    C2]  ? __ip_finish_output (./include/linux/skbuff.h:1724 ./include/linux/skbuff.h:5149 net/ipv4/ip_output.c:309 net/ipv4/ip_output.c:297)
[   21.656234][    C2]  ip_output (./include/linux/netfilter.h:307 net/ipv4/ip_output.c:438)
[   21.656518][    C2]  ? ip_finish_output (net/ipv4/ip_output.c:429)
[   21.656873][    C2]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   21.657235][    C2]  __ip_queue_xmit (./include/net/dst.h:464 net/ipv4/ip_output.c:131 net/ipv4/ip_output.c:534)
[   21.657596][    C2]  ? __skb_clone (./arch/x86/include/asm/atomic.h:53 (discriminator 4) ./include/linux/atomic/atomic-arch-fallback.h:992 (discriminator 4) ./include/linux/atomic/atomic-instrumented.h:436 (discriminator 4) net/core/skbuff.c:1585 (discriminator 4))
[   21.657954][    C2]  __tcp_transmit_skb (net/ipv4/tcp_output.c:1628)
[   21.658315][    C2]  ? __tcp_select_window (net/ipv4/tcp_output.c:1449)
[   21.658694][    C2]  tcp_connect (net/ipv4/tcp_output.c:1646 net/ipv4/tcp_output.c:4335)
[   21.659053][    C2]  tcp_v4_connect (net/ipv4/tcp_ipv4.c:347)
[   21.659407][    C2]  ? bpf_iter_init_tcp (net/ipv4/tcp_ipv4.c:225)
[   21.659770][    C2]  ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:455)
[   21.660119][    C2]  mptcp_connect (net/mptcp/protocol.c:3803)
[   21.660466][    C2]  __inet_stream_connect (net/ipv4/af_inet.c:679)
[   21.660830][    C2]  ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:455)
[   21.661177][    C2]  ? __inet_stream_connect (net/ipv4/af_inet.c:746)
[   21.661527][    C2]  inet_stream_connect (net/ipv4/af_inet.c:751)
[   21.661880][    C2]  __sys_connect (./include/linux/file.h:62 ./include/linux/file.h:83 net/socket.c:2111)
[   21.662233][    C2]  ? __sys_connect_file (net/socket.c:2109)
[   21.662598][    C2]  ? __sys_setsockopt (./include/linux/file.h:62 ./include/linux/file.h:83 net/socket.c:2377)
[   21.662957][    C2]  __x64_sys_connect (net/socket.c:2124)
[   21.663301][    C2]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   21.663663][    C2]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   21.664021][    C2]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   21.664443][    C2] RIP: 0033:0x7f0c89698d67
[   21.664822][    C2] Code: 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2a 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 18 89 54 24 0c 48 89 34 24 89
All code
========
   0:	64 89 01             	mov    %eax,%fs:(%rcx)
   3:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
   7:	c3                   	ret
   8:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   f:	00 00 00 
  12:	90                   	nop
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2a 00 00 00       	mov    $0x2a,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 18          	sub    $0x18,%rsp
  37:	89 54 24 0c          	mov    %edx,0xc(%rsp)
  3b:	48 89 34 24          	mov    %rsi,(%rsp)
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 18          	sub    $0x18,%rsp
   d:	89 54 24 0c          	mov    %edx,0xc(%rsp)
  11:	48 89 34 24          	mov    %rsi,(%rsp)
  15:	89                   	.byte 0x89
[   21.666026][    C2] RSP: 002b:00007ffe7020c7c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
[   21.666545][    C2] RAX: ffffffffffffffda RBX: 0000000039daa2a0 RCX: 00007f0c89698d67
[   21.667066][    C2] RDX: 0000000000000010 RSI: 0000000039daa2d0 RDI: 0000000000000005
[   21.667582][    C2] RBP: 0000000000000005 R08: 0000000000000005 R09: 0000000000000001
[   21.668098][    C2] R10: 00007f0c8958f618 R11: 0000000000000246 R12: 0000000000000000


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