======================================
|
| [   78.338267][    C1] ------------[ cut here ]------------
| [   78.338796][    C1] kernel BUG at net/core/skbuff.c:2813!
| [   78.339097][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   78.339815][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 78.340381][ C1] RIP: 0010:__pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 78.340713][ C1] Code: e9 52 f7 ff ff 48 8b 7c 24 38 be 02 00 00 00 e8 9e 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 9e 9c ff ff       	call   0xffffffffffff9cb2
  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)
[   78.341606][    C1] RSP: 0018:ffffc900001c8b68 EFLAGS: 00010282
[   78.341935][    C1] RAX: 00000000fffffff2 RBX: ffff888005a809ac RCX: 0000000000000004
[   78.342312][    C1] RDX: dffffc0000000000 RSI: 1ffff11000b42d09 RDI: ffff888005a16848
[   78.342701][    C1] RBP: ffffc900001c8be8 R08: 0000000000000014 R09: ffff888005a809f4
[   78.343081][    C1] R10: ffff888005a809f8 R11: ffff888005a809f8 R12: ffff888005a80940
[   78.343460][    C1] R13: 0000000000000100 R14: 0000000000000000 R15: ffff888005a809ea
[   78.343841][    C1] FS:  00007fbdcc469b80(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[   78.344282][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   78.344605][    C1] CR2: 0000000000935008 CR3: 0000000007f42001 CR4: 0000000000770ef0
[   78.344985][    C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   78.345361][    C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   78.345742][    C1] PKRU: 55555554
[   78.345936][    C1] Call Trace:
[   78.346129][    C1]  <IRQ>
[ 78.346265][ C1] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 78.346465][ C1] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[ 78.346663][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 78.346919][ C1] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[ 78.347171][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 78.347427][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 78.347680][ C1] ? handle_invalid_op (arch/x86/kernel/traps.c:213) 
[ 78.347931][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 78.348182][ C1] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[ 78.348437][ C1] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 78.348694][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 78.348949][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813) 
[ 78.349199][ C1] ? __netif_receive_skb_core.constprop.0 (net/core/dev.c:5498) 
[ 78.349519][ C1] tcp_v4_early_demux (./include/linux/skbuff.h:2731 ./include/linux/skbuff.h:2739 net/ipv4/tcp_ipv4.c:1966) 
[ 78.349779][ C1] ip_rcv_finish_core.constprop.0 (./include/linux/skbuff.h:2943 ./include/linux/ip.h:21 net/ipv4/ip_input.c:344) 
[ 78.350094][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 78.350353][ C1] ip_rcv (net/ipv4/ip_input.c:448 ./include/linux/netfilter.h:422 net/ipv4/ip_input.c:569) 
[ 78.350549][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 78.350821][ C1] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[ 78.351134][ C1] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 78.351448][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 78.351699][ C1] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 78.351949][ C1] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:6053) 
[ 78.352200][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 78.352455][ C1] __napi_poll.constprop.0 (net/core/dev.c:6703) 
[ 78.352715][ C1] net_rx_action (net/core/dev.c:6772 net/core/dev.c:6886) 
[ 78.352975][ C1] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 78.353231][ C1] ? hlock_class (kernel/locking/lockdep.c:223) 
[ 78.353490][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 78.353744][ C1] ? hrtimer_interrupt (kernel/time/hrtimer.c:1828) 
[ 78.354007][ C1] __do_softirq (kernel/softirq.c:553) 
[ 78.354261][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4399) 
[ 78.354515][ C1] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[   78.354708][    C1]  </IRQ>
[   78.354837][    C1]  <TASK>
[ 78.354964][ C1] __local_bh_enable_ip (kernel/softirq.c:381) 
[ 78.355217][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4399) 
[ 78.355469][ C1] __dev_queue_xmit (net/core/dev.c:4400) 
[ 78.355723][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 78.356037][ C1] ? __pfx___dev_queue_xmit (net/core/dev.c:4281) 
[ 78.356293][ C1] ip_finish_output2 (./include/net/neighbour.h:540 net/ipv4/ip_output.c:235) 
[ 78.356547][ C1] ? 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) 
[ 78.356800][ C1] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 78.357064][ C1] ? __ip_finish_output (./include/linux/skbuff.h:1624 ./include/linux/skbuff.h:4942 net/ipv4/ip_output.c:307) 
[ 78.357316][ C1] __ip_queue_xmit (net/ipv4/ip_output.c:535 (discriminator 4)) 
[ 78.357569][ C1] ? tcp_options_write (net/ipv4/tcp_output.c:670) 
[ 78.357822][ C1] __tcp_transmit_skb (net/ipv4/tcp_output.c:1462 (discriminator 4)) 
[ 78.358080][ C1] ? __pfx___tcp_transmit_skb (net/ipv4/tcp_output.c:1283) 
[ 78.358333][ C1] ? tcp_mtu_probe (./include/net/net_namespace.h:383 ./include/net/sock.h:648 net/ipv4/tcp_output.c:2420) 
[ 78.358587][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 78.358843][ C1] ? tcp_small_queue_check.isra.0 (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 net/ipv4/tcp_output.c:2623) 
[ 78.359159][ C1] tcp_write_xmit (net/ipv4/tcp_output.c:2792) 
[ 78.359414][ C1] ? __pfx_tcp_current_mss (net/ipv4/tcp_output.c:1853) 
[ 78.359663][ C1] ? __alloc_skb (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 ./include/linux/refcount.h:125 net/core/skbuff.c:696) 
[ 78.359916][ C1] ? __pfx_tcp_write_xmit (net/ipv4/tcp_output.c:2702) 
[ 78.360168][ C1] ? tcp_inq_hint (net/ipv4/tcp.c:2299) 
[ 78.360426][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:4360) 
[ 78.360740][ C1] __tcp_push_pending_frames (net/ipv4/tcp_output.c:2977) 
[ 78.360995][ C1] __tcp_close (net/ipv4/tcp.c:2842) 
[ 78.361250][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 78.361563][ C1] tcp_close (net/ipv4/tcp.c:2932) 
[ 78.361753][ C1] inet_release (net/ipv4/af_inet.c:436) 
[ 78.362011][ C1] __sock_release (net/socket.c:659) 
[ 78.362268][ C1] sock_close (net/socket.c:1423) 
[ 78.362460][ C1] __fput (fs/file_table.c:376) 
[ 78.362654][ C1] __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) 
[ 78.362919][ C1] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 78.363173][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   78.363491][    C1] RIP: 0033:0x7fbdcc5aa02b
[ 78.363749][ C1] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 cb f5 ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 cc f5 ff 8b 44
All code
========
   0:	03 00                	add    (%rax),%eax
   2:	00 00                	add    %al,(%rax)
   4:	0f 05                	syscall
   6:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   c:	77 41                	ja     0x4f
   e:	c3                   	ret
   f:	48 83 ec 18          	sub    $0x18,%rsp
  13:	89 7c 24 0c          	mov    %edi,0xc(%rsp)
  17:	e8 c3 cb f5 ff       	call   0xfffffffffff5cbdf
  1c:	8b 7c 24 0c          	mov    0xc(%rsp),%edi
  20:	41 89 c0             	mov    %eax,%r8d
  23:	b8 03 00 00 00       	mov    $0x3,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 35                	ja     0x67
  32:	44 89 c7             	mov    %r8d,%edi
  35:	89 44 24 0c          	mov    %eax,0xc(%rsp)
  39:	e8 21 cc f5 ff       	call   0xfffffffffff5cc5f
  3e:	8b                   	.byte 0x8b
  3f:	44                   	rex.R

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 35                	ja     0x3d
   8:	44 89 c7             	mov    %r8d,%edi
   b:	89 44 24 0c          	mov    %eax,0xc(%rsp)
   f:	e8 21 cc f5 ff       	call   0xfffffffffff5cc35
  14:	8b                   	.byte 0x8b
  15:	44                   	rex.R
[   78.364635][    C1] RSP: 002b:00007ffddec6a2c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[   78.365023][    C1] RAX: ffffffffffffffda RBX: 000000000000005c RCX: 00007fbdcc5aa02b
[   78.365397][    C1] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000000b
[   78.365775][    C1] RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
[   78.366151][    C1] R10: 00007ffddec6a188 R11: 0000000000000293 R12: 0000000000000008


Finger prints:
__pskb_pull_tail:tcp_v4_early_demux:ip_rcv:__netif_receive_skb_one_core