======================================
| [   16.161967][  T278] ip (278) used greatest stack depth: 24592 bytes left
| [   17.421877][    C1] ------------[ cut here ]------------
| [   17.422444][    C1] WARNING: CPU: 1 PID: 290 at ./include/net/sch_generic.h:843 __dev_xmit_skb (./include/net/sch_generic.h:843 ./include/net/sch_generic.h:889 ./include/net/sch_generic.h:895 net/core/dev.c:4168)
| [   17.423077][    C1] Modules linked in: netdevsim psample
[   17.424186][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.424640][    C1] RIP: 0010:__dev_xmit_skb (./include/net/sch_generic.h:843 ./include/net/sch_generic.h:889 ./include/net/sch_generic.h:895 net/core/dev.c:4168)
[   17.425016][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 09 84 c0 74 05 e8 1c c6 e8 fe 41 c6 87 b0 01 00 00 00 45 31 ed e9 06 f6 ff ff 90 <0f> 0b 90 e9 00 ff ff ff be 08 00 00 00 48 89 ef e8 56 cc e8 fe f0
All code
========
   0:	ea                   	(bad)
   1:	03 0f                	add    (%rdi),%ecx
   3:	b6 04                	mov    $0x4,%dh
   5:	02 48 89             	add    -0x77(%rax),%cl
   8:	fa                   	cli
   9:	83 e2 07             	and    $0x7,%edx
   c:	38 d0                	cmp    %dl,%al
   e:	7f 09                	jg     0x19
  10:	84 c0                	test   %al,%al
  12:	74 05                	je     0x19
  14:	e8 1c c6 e8 fe       	call   0xfffffffffee8c635
  19:	41 c6 87 b0 01 00 00 	movb   $0x0,0x1b0(%r15)
  20:	00 
  21:	45 31 ed             	xor    %r13d,%r13d
  24:	e9 06 f6 ff ff       	jmp    0xfffffffffffff62f
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 00 ff ff ff       	jmp    0xffffffffffffff32
  32:	be 08 00 00 00       	mov    $0x8,%esi
  37:	48 89 ef             	mov    %rbp,%rdi
  3a:	e8 56 cc e8 fe       	call   0xfffffffffee8cc95
  3f:	f0                   	lock

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 00 ff ff ff       	jmp    0xffffffffffffff08
   8:	be 08 00 00 00       	mov    $0x8,%esi
   d:	48 89 ef             	mov    %rbp,%rdi
  10:	e8 56 cc e8 fe       	call   0xfffffffffee8cc6b
  15:	f0                   	lock
[   17.426324][    C1] RSP: 0018:ffffc900001c06a0 EFLAGS: 00010202
[   17.426787][    C1] RAX: 0000000000000001 RBX: ffffe8ffffc877e0 RCX: 0000000000000000
[   17.427341][    C1] RDX: 0000000000000007 RSI: ffffffff84c602c0 RDI: ffff88800d40b286
[   17.427890][    C1] RBP: ffff88800bea2198 R08: 0000000000000001 R09: 0000000000000001
[   17.428438][    C1] R10: 000000000000a000 R11: ffff88800bea2228 R12: ffff88800f490128
[   17.428979][    C1] R13: ffff88800d40b280 R14: ffff88800bea2210 R15: ffff88800bea2000
[   17.429668][    C1] FS:  00007f69367eeb80(0000) GS:ffff8880df988000(0000) knlGS:0000000000000000
[   17.430318][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.430791][    C1] CR2: 00007f69369013a0 CR3: 000000000e7e0005 CR4: 0000000000772ef0
[   17.431342][    C1] PKRU: 55555554
[   17.431616][    C1] Call Trace:
[   17.431890][    C1]  <IRQ>
[   17.432088][    C1]  ? napi_hash_add (net/core/dev.c:4073)
[   17.432465][    C1]  ? dev_get_stats (net/core/dev.c:4143)
[   17.432834][    C1]  __dev_queue_xmit (net/core/dev.c:4786)
[   17.433210][    C1]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.433577][    C1]  ? netdev_core_pick_tx (net/core/dev.c:4728)
[   17.433942][    C1]  ? eth_header (net/ethernet/eth.c:100)
[   17.434312][    C1]  ? neigh_resolve_output (./include/linux/netdevice.h:3422 net/core/neighbour.c:1589 net/core/neighbour.c:1574)
[   17.434680][    C1]  ? __neigh_update (./include/linux/rcupdate.h:331 ./include/linux/rcupdate.h:867 net/core/neighbour.c:1476)
[   17.435041][    C1]  __neigh_update (./include/linux/instrumented.h:96 (discriminator 2) ./include/linux/atomic/atomic-instrumented.h:400 (discriminator 2) ./include/linux/refcount.h:389 (discriminator 2) ./include/linux/refcount.h:432 (discriminator 2) ./include/linux/refcount.h:450 (discriminator 2) ./include/net/neighbour.h:458 (discriminator 2) net/core/neighbour.c:1494 (discriminator 2))
[   17.435424][    C1]  arp_process (./include/linux/instrumented.h:96 (discriminator 4) ./include/linux/atomic/atomic-instrumented.h:400 (discriminator 4) ./include/linux/refcount.h:389 (discriminator 4) ./include/linux/refcount.h:432 (discriminator 4) ./include/linux/refcount.h:450 (discriminator 4) ./include/net/neighbour.h:458 (discriminator 4) net/ipv4/arp.c:937 (discriminator 4))
[   17.435791][    C1]  ? arp_send (net/ipv4/arp.c:702)
[   17.436058][    C1]  ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26)
[   17.436438][    C1]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.436796][    C1]  ? arp_rcv.part.0 (net/ipv4/arp.c:968)
[   17.437155][    C1]  __netif_receive_skb_one_core (net/core/dev.c:6131)
[   17.437606][    C1]  ? __netif_receive_skb_list_core (net/core/dev.c:6131)
[   17.438049][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   17.438426][    C1]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[   17.438780][    C1]  ? netif_receive_skb_internal (./include/linux/rcupdate.h:331 (discriminator 16) ./include/linux/rcupdate.h:867 (discriminator 16) net/core/dev.c:6324 (discriminator 16))
[   17.439236][    C1]  netif_receive_skb_internal (net/core/dev.c:6337)
[   17.439597][    C1]  ? __netif_receive_skb (net/core/dev.c:6316)
[   17.439954][    C1]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   17.440319][    C1]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194)
[   17.440772][    C1]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   17.441132][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   17.441499][    C1]  netif_receive_skb (net/core/dev.c:6396)
[   17.441860][    C1] nsim_poll (drivers/net/netdevsim/netdev.c:439 drivers/net/netdevsim/netdev.c:454) netdevsim
[   17.442250][    C1]  ? nsim_start_peer_tx_queue.isra.0 (drivers/net/netdevsim/netdev.c:450) netdevsim
[   17.442791][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   17.443151][    C1]  __napi_poll.constprop.0 (net/core/dev.c:7668)
[   17.443521][    C1]  net_rx_action (net/core/dev.c:7730 net/core/dev.c:7882)
[   17.443887][    C1]  ? run_backlog_napi (net/core/dev.c:7844)
[   17.444274][    C1]  ? clockevents_program_event (kernel/time/clockevents.c:326)
[   17.444636][    C1]  ? lock_downgrade (kernel/locking/lockdep.c:471 kernel/locking/lockdep.c:5764)
[   17.445002][    C1]  ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:95 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86)
[   17.445374][    C1]  ? ktime_get (kernel/time/timekeeping.c:387 (discriminator 4) kernel/time/timekeeping.c:404 (discriminator 4) kernel/time/timekeeping.c:826 (discriminator 4))
[   17.445649][    C1]  ? clockevents_program_event (kernel/time/clockevents.c:336 (discriminator 3))
[   17.446107][    C1]  handle_softirqs (kernel/softirq.c:623)
[   17.446486][    C1]  ? __neigh_event_send (./include/linux/bottom_half.h:33 net/core/neighbour.c:1273)
[   17.446847][    C1]  do_softirq (kernel/softirq.c:523 kernel/softirq.c:510)
[   17.447115][    C1]  </IRQ>
[   17.447320][    C1]  <TASK>
[   17.447503][    C1]  __local_bh_enable_ip (kernel/softirq.c:450)
[   17.447859][    C1]  __neigh_event_send (net/core/neighbour.c:1274)
[   17.448230][    C1]  neigh_resolve_output (net/core/neighbour.c:1578)
[   17.448598][    C1]  ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:455)
[   17.448959][    C1]  ? ___neigh_create (net/core/neighbour.c:727)
[   17.449333][    C1]  ip_finish_output2 (./include/net/neighbour.h:556 net/ipv4/ip_output.c:237)
[   17.449695][    C1]  ? ip_skb_dst_mtu (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/ip.h:504 ./include/net/ip.h:518)
[   17.450056][    C1]  ? ip_append_data.part.0 (net/ipv4/ip_output.c:201)
[   17.450420][    C1]  ? ip_skb_dst_mtu (./include/net/ip.h:523)
[   17.450786][    C1]  ? __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)
[   17.451144][    C1]  ip_output (./include/linux/netfilter.h:307 net/ipv4/ip_output.c:438)
[   17.451429][    C1]  ? ip_finish_output (net/ipv4/ip_output.c:429)
[   17.451785][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.452160][    C1]  __ip_queue_xmit (./include/net/dst.h:464 net/ipv4/ip_output.c:131 net/ipv4/ip_output.c:534)
[   17.452528][    C1]  ? __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))
[   17.452888][    C1]  __tcp_transmit_skb (net/ipv4/tcp_output.c:1628)
[   17.453264][    C1]  ? __tcp_select_window (net/ipv4/tcp_output.c:1449)
[   17.453622][    C1]  ? tcp_fastopen_cache_get (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/ipv4/tcp_metrics.c:581)
[   17.453984][    C1]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   17.454361][    C1]  ? tcp_fastopen_no_cookie (./include/net/net_namespace.h:414 ./include/net/sock.h:695 net/ipv4/tcp_fastopen.c:342)
[   17.454726][    C1]  tcp_send_syn_data (net/ipv4/tcp_output.c:1646 net/ipv4/tcp_output.c:4245)
[   17.455093][    C1]  tcp_connect (net/ipv4/tcp_output.c:4336 (discriminator 2))
[   17.455467][    C1]  tcp_v4_connect (net/ipv4/tcp_ipv4.c:347)
[   17.455836][    C1]  ? tcp_v4_conn_request (net/ipv4/tcp_ipv4.c:225)
[   17.456197][    C1]  ? kasan_save_stack (mm/kasan/common.c:58)
[   17.456553][    C1]  ? kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:69 mm/kasan/common.c:78)
[   17.456911][    C1]  ? __kasan_kmalloc (mm/kasan/common.c:421)
[   17.457274][    C1]  ? tcp_sendmsg_fastopen (net/ipv4/tcp.c:1046)
[   17.457630][    C1]  ? tcp_sendmsg_locked (net/ipv4/tcp.c:1143)
[   17.457983][    C1]  ? tcp_sendmsg (net/ipv4/tcp.c:1413)
[   17.458345][    C1]  ? __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2244)
[   17.458708][    C1]  tcp_v6_connect (net/ipv6/tcp_ipv6.c:241)
[   17.459068][    C1]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.459445][    C1]  ? inet6_sk_rx_dst_set (net/ipv6/tcp_ipv6.c:138)
[   17.459805][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.460179][    C1]  ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194)
[   17.460627][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   17.460991][    C1]  __inet_stream_connect (net/ipv4/af_inet.c:679)
[   17.461353][    C1]  ? kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:69 mm/kasan/common.c:78)
[   17.461714][    C1]  tcp_sendmsg_fastopen (net/ipv4/tcp.c:1069)
[   17.462088][    C1]  tcp_sendmsg_locked (net/ipv4/tcp.c:1143)
[   17.462456][    C1]  ? validate_chain (kernel/locking/lockdep.c:3801 kernel/locking/lockdep.c:3821 kernel/locking/lockdep.c:3876)
[   17.462813][    C1]  ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[   17.463181][    C1]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.463543][    C1]  ? tcp_sendmsg_fastopen (net/ipv4/tcp.c:1078)
[   17.463900][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.464268][    C1]  ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:455)
[   17.464632][    C1]  tcp_sendmsg (net/ipv4/tcp.c:1413)
[   17.464901][    C1]  __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2244)
[   17.465265][    C1]  ? __ia32_sys_getpeername (net/socket.c:2211)
[   17.465631][    C1]  ? fd_install (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 fs/file.c:676)
[   17.465990][    C1]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   17.466369][    C1]  ? fd_install (./arch/x86/include/asm/preempt.h:104 ./include/linux/rcupdate.h:981 fs/file.c:676)
[   17.466727][    C1]  ? __sys_socket (net/socket.c:516 net/socket.c:1756)
[   17.467085][    C1]  ? update_socket_protocol+0x10/0x10
[   17.467453][    C1]  ? do_user_addr_fault (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/mmap_lock.h:143 ./include/linux/mmap_lock.h:182 arch/x86/mm/fault.c:1338)
[   17.467817][    C1]  __x64_sys_sendto (net/socket.c:2247)
[   17.468179][    C1]  ? do_syscall_64 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/entry-common.h:124 arch/x86/entry/syscall_64.c:90)
[   17.468537][    C1]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   17.468895][    C1]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   17.469261][    C1]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   17.469705][    C1] RIP: 0033:0x7f693690127a
[   17.470083][    C1] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[   17.471706][    C1] RSP: 002b:00007fffdf5c6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   17.472551][    C1] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f693690127a
[   17.473098][    C1] RDX: 000000000000000d RSI: 000000000040213e RDI: 0000000000000005
[   17.473647][    C1] RBP: 0000000000000005 R08: 00000000004040c0 R09: 000000000000001c
[   17.474466][    C1] R10: 0000000020000000 R11: 0000000000000246 R12: 00007fffdf5c69d8


Finger prints:
__dev_xmit_skb:__dev_queue_xmit:__neigh_update:arp_process:__netif_receive_skb_one_core