======================================
|
| [   26.017040][    C2] ------------[ cut here ]------------
| [   26.017393][    C2] kernel BUG at net/core/skbuff.c:2813!
| [   26.017663][    C2] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   26.018084][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 26.018418][ C2] RIP: 0010:__pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 26.018618][ C2] Code: e9 52 f7 ff ff 48 8b 7c 24 38 be 02 00 00 00 e8 8e 9c ff ff 48 83 c4 58 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 90 <0f> 0b 48 c7 44 24 38 00 00 00 00 e9 dc fa ff ff 84 c9 0f 84 4b f9
All code
========
   0:	e9 52 f7 ff ff       	jmp    0xfffffffffffff757
   5:	48 8b 7c 24 38       	mov    0x38(%rsp),%rdi
   a:	be 02 00 00 00       	mov    $0x2,%esi
   f:	e8 8e 9c ff ff       	call   0xffffffffffff9ca2
  14:	48 83 c4 58          	add    $0x58,%rsp
  18:	31 c0                	xor    %eax,%eax
  1a:	5b                   	pop    %rbx
  1b:	41 5c                	pop    %r12
  1d:	41 5d                	pop    %r13
  1f:	41 5e                	pop    %r14
  21:	41 5f                	pop    %r15
  23:	5d                   	pop    %rbp
  24:	c3                   	ret
  25:	cc                   	int3
  26:	cc                   	int3
  27:	cc                   	int3
  28:	cc                   	int3
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	48 c7 44 24 38 00 00 	movq   $0x0,0x38(%rsp)
  33:	00 00 
  35:	e9 dc fa ff ff       	jmp    0xfffffffffffffb16
  3a:	84 c9                	test   %cl,%cl
  3c:	0f                   	.byte 0xf
  3d:	84 4b f9             	test   %cl,-0x7(%rbx)

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	48 c7 44 24 38 00 00 	movq   $0x0,0x38(%rsp)
   9:	00 00 
   b:	e9 dc fa ff ff       	jmp    0xfffffffffffffaec
  10:	84 c9                	test   %cl,%cl
  12:	0f                   	.byte 0xf
  13:	84 4b f9             	test   %cl,-0x7(%rbx)
[   26.019149][    C2] RSP: 0018:ffffc90000220858 EFLAGS: 00010282
[   26.019349][    C2] RAX: 00000000fffffff2 RBX: ffff888005ec9074 RCX: 0000000000000004
[   26.019572][    C2] RDX: dffffc0000000000 RSI: 1ffff11000deb4a1 RDI: ffff888006f5a508
[   26.019798][    C2] RBP: ffffc900002208d8 R08: 0000000000000014 R09: ffff888005ec90bc
[   26.020022][    C2] R10: ffff888005ec90c0 R11: ffff888005ec90c0 R12: ffff888005ec9000
[   26.020246][    C2] R13: 0000000000000100 R14: 0000000000000000 R15: 1ffff92000044137
[   26.020469][    C2] FS:  00007fad207a8740(0000) GS:ffff888036100000(0000) knlGS:0000000000000000
[   26.020726][    C2] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   26.020912][    C2] CR2: 00007fad208fa910 CR3: 0000000006082006 CR4: 0000000000770ef0
[   26.021139][    C2] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   26.021361][    C2] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   26.021588][    C2] PKRU: 55555554
[   26.021705][    C2] Call Trace:
[   26.021817][    C2]  <IRQ>
[ 26.021895][ C2] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 26.022011][ C2] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[ 26.022125][ C2] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 26.022274][ C2] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[ 26.022422][ C2] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 26.022569][ C2] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 26.022716][ C2] ? handle_invalid_op (arch/x86/kernel/traps.c:213) 
[ 26.022871][ C2] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 26.023019][ C2] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[ 26.023169][ C2] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 26.023321][ C2] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 26.023469][ C2] ? __pskb_pull_tail (net/core/skbuff.c:2813) 
[ 26.023618][ C2] tcp_v4_rcv (./include/linux/skbuff.h:2731 ./include/linux/skbuff.h:2739 net/ipv4/tcp_ipv4.c:2181) 
[ 26.023771][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 26.023922][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 26.024073][ C2] ? raw_v4_input (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 net/ipv4/raw.c:189) 
[ 26.024226][ C2] ? __pfx_tcp_v4_rcv (net/ipv4/tcp_ipv4.c:2163) 
[ 26.024374][ C2] ? __pfx_raw_v4_input (net/ipv4/raw.c:165) 
[ 26.024521][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 26.024668][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 26.024819][ C2] ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207 (discriminator 8)) 
[ 26.024968][ C2] ip_local_deliver_finish (./include/linux/rcupdate.h:779 net/ipv4/ip_input.c:234) 
[ 26.025117][ C2] ip_local_deliver (./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv4/ip_input.c:254) 
[ 26.025265][ C2] ? __pfx_ip_local_deliver (net/ipv4/ip_input.c:243) 
[ 26.025417][ C2] ? ip_rcv_finish_core.constprop.0 (./include/net/net_namespace.h:383 ./include/linux/netdevice.h:2654 net/ipv4/ip_input.c:372) 
[ 26.025602][ C2] ip_rcv (./include/net/dst.h:460 net/ipv4/ip_input.c:449 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv4/ip_input.c:569) 
[ 26.025713][ C2] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 26.025861][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 26.026009][ C2] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 26.026158][ C2] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 26.026305][ C2] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[ 26.026487][ C2] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 26.026698][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 26.026845][ C2] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 26.026994][ C2] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:6053) 
[ 26.027142][ C2] __napi_poll.constprop.0 (net/core/dev.c:6703) 
[ 26.027290][ C2] net_rx_action (net/core/dev.c:6772 net/core/dev.c:6886) 
[ 26.027438][ C2] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 26.027586][ C2] ? usage_skip (kernel/locking/lockdep.c:2295 kernel/locking/lockdep.c:2263) 
[ 26.027733][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 26.027881][ C2] __do_softirq (kernel/softirq.c:553) 
[ 26.028032][ C2] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4399) 
[ 26.028181][ C2] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[   26.028292][    C2]  </IRQ>
[   26.028367][    C2]  <TASK>
[ 26.028441][ C2] __local_bh_enable_ip (kernel/softirq.c:381) 
[ 26.028587][ C2] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4399) 
[ 26.028733][ C2] __dev_queue_xmit (net/core/dev.c:4400) 
[ 26.028881][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 26.029028][ C2] ? eth_header (net/ethernet/eth.c:100) 
[ 26.029180][ C2] ? __pfx___dev_queue_xmit (net/core/dev.c:4281) 
[ 26.029327][ C2] ? neigh_resolve_output (./include/linux/netdevice.h:3226 net/core/neighbour.c:1558 net/core/neighbour.c:1543) 
[ 26.029477][ C2] ip_finish_output2 (./include/net/neighbour.h:542 net/ipv4/ip_output.c:235) 
[ 26.029626][ C2] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 26.029773][ C2] ? __ip_finish_output (./include/linux/skbuff.h:1624 ./include/linux/skbuff.h:4942 net/ipv4/ip_output.c:307 net/ipv4/ip_output.c:295) 
[ 26.029920][ C2] ip_output (./include/linux/netfilter.h:303 net/ipv4/ip_output.c:433) 
[ 26.030030][ C2] ? __pfx_ip_output (net/ipv4/ip_output.c:427) 
[ 26.030178][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 26.030329][ C2] ? ip_local_out (./include/linux/skbuff.h:1136 ./include/net/dst.h:450 net/ipv4/ip_output.c:129) 
[ 26.030476][ C2] __ip_queue_xmit (net/ipv4/ip_output.c:535 (discriminator 4)) 
[ 26.030623][ 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:1605 (discriminator 4)) 
[ 26.030770][ C2] __tcp_transmit_skb (net/ipv4/tcp_output.c:1462 (discriminator 4)) 
[ 26.030919][ C2] ? __pfx___tcp_transmit_skb (net/ipv4/tcp_output.c:1283) 
[ 26.031067][ C2] ? tcp_call_bpf (./include/net/sock.h:1698 ./include/net/sock.h:1793 ./include/net/tcp.h:2632) 
[ 26.031216][ C2] tcp_connect (net/ipv4/tcp_output.c:1480 net/ipv4/tcp_output.c:4100) 
[ 26.031363][ C2] tcp_v4_connect (net/ipv4/tcp_ipv4.c:324) 
[ 26.031513][ C2] ? __pfx_tcp_v4_connect (net/ipv4/tcp_ipv4.c:202) 
[ 26.031661][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 26.031773][ C2] __inet_stream_connect (net/ipv4/af_inet.c:678) 
[ 26.031921][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 26.032102][ C2] inet_stream_connect (net/ipv4/af_inet.c:750) 
[ 26.032250][ C2] __sys_connect (net/socket.c:2048 net/socket.c:2065) 
[ 26.032398][ C2] ? __pfx___sys_connect (net/socket.c:2055) 
[ 26.032544][ C2] ? __sys_getsockopt (./include/linux/file.h:32 net/socket.c:2405) 
[ 26.032695][ C2] ? __pfx___sys_getsockopt (net/socket.c:2392) 
[ 26.032844][ C2] ? __pfx___up_read (kernel/locking/rwsem.c:1339) 
[ 26.032992][ C2] ? do_user_addr_fault (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1357) 
[ 26.033140][ C2] __x64_sys_connect (net/socket.c:2072) 
[ 26.033288][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 26.033436][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   26.033617][    C2] RIP: 0033:0x7fad208fa3d7
[ 26.033768][ C2] Code: 0a 00 f7 d8 64 89 02 b8 ff ff ff ff eb bc 0f 1f 44 00 00 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:	0a 00                	or     (%rax),%al
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	b8 ff ff ff ff       	mov    $0xffffffff,%eax
   c:	eb bc                	jmp    0xffffffffffffffca
   e:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  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
[   26.034291][    C2] RSP: 002b:00007fffacca8cd8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
[   26.034513][    C2] RAX: ffffffffffffffda RBX: 0000000000408a68 RCX: 00007fad208fa3d7
[   26.034733][    C2] RDX: 0000000000000010 RSI: 00007fffacca8d00 RDI: 0000000000000005
[   26.034957][    C2] RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
[   26.035174][    C2] R10: 00007fad207b2598 R11: 0000000000000246 R12: 0000000000000004


Finger prints:
__pskb_pull_tail:tcp_v4_rcv:ip_protocol_deliver_rcu:ip_local_deliver_finish