======================================
| [ 1968.022766][T17680] ==================================================================
| [1968.023018][T17680] BUG: KASAN: null-ptr-deref in sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) 
| [ 1968.023236][T17680] Read of size 8 at addr 0000000000000008 by task cmsg_sender/17680
| [ 1968.023465][T17680]
[ 1968.023770][T17680] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1968.024088][T17680] Call Trace:
[ 1968.024199][T17680]  <TASK>
[1968.024272][T17680] dump_stack_lvl (lib/dump_stack.c:117) 
[1968.024415][T17680] kasan_report (mm/kasan/report.c:603) 
[1968.024522][T17680] ? sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) 
[1968.024697][T17680] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[1968.024840][T17680] sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) 
[1968.024982][T17680] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[1968.025093][T17680] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[1968.025235][T17680] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[1968.025339][T17680] dummy_xmit (drivers/net/dummy.c:66) 
[1968.025447][T17680] ? trace_net_dev_start_xmit (./include/trace/events/net.h:14 (discriminator 52)) 
[1968.025590][T17680] dev_hard_start_xmit (./include/linux/netdevice.h:4875 ./include/linux/netdevice.h:4889 net/core/dev.c:3563 net/core/dev.c:3579) 
[1968.025738][T17680] sch_direct_xmit (net/sched/sch_generic.c:343) 
[1968.025881][T17680] ? __pfx_sch_direct_xmit (net/sched/sch_generic.c:318) 
[1968.026023][T17680] ? __pfx_fq_classify (net/sched/sch_fq.c:347) sch_fq
[1968.026171][T17680] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[1968.026313][T17680] __qdisc_run (net/sched/sch_generic.c:416) 
[1968.026453][T17680] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[1968.026629][T17680] ? __pfx___qdisc_run (net/sched/sch_generic.c:412) 
[1968.026769][T17680] ? fq_enqueue (net/sched/sch_fq.c:539) sch_fq
[1968.026915][T17680] ? spin_bug (./include/linux/pid.h:232 kernel/locking/spinlock_debug.c:64 kernel/locking/spinlock_debug.c:78) 
[1968.027024][T17680] __dev_xmit_skb (./include/net/sch_generic.h:217 net/core/dev.c:3856) 
[1968.027162][T17680] ? lock_sync (kernel/locking/lockdep.c:122 kernel/locking/lockdep.c:5794) 
[1968.027269][T17680] ? __pfx___dev_xmit_skb (net/core/dev.c:3767) 
[1968.027412][T17680] __dev_queue_xmit (net/core/dev.c:4338) 
[1968.027555][T17680] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[1968.027727][T17680] ? __pfx___dev_queue_xmit (net/core/dev.c:4281) 
[1968.027871][T17680] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[1968.028016][T17680] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[1968.028158][T17680] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243) 
[1968.028263][T17680] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230) 
[1968.028402][T17680] ? __pfx_ip_generic_getfrag (net/ipv4/ip_output.c:935) 
[1968.028546][T17680] ? ip6_local_out (net/ipv6/output_core.c:154) 
[1968.028687][T17680] ip6_send_skb (net/ipv6/ip6_output.c:1956) 
[1968.028828][T17680] udp_v6_send_skb (net/ipv6/udp.c:1297) 
[1968.028972][T17680] udpv6_sendmsg (net/ipv6/udp.c:1592) 
[1968.029111][T17680] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[1968.029254][T17680] ? __pfx_ip_generic_getfrag (net/ipv4/ip_output.c:935) 
[1968.029394][T17680] ? __pfx_udpv6_sendmsg (net/ipv6/udp.c:1333) 
[1968.029533][T17680] ? reacquire_held_locks (kernel/locking/lockdep.c:5279) 
[1968.029678][T17680] ? __lock_release (kernel/locking/lockdep.c:5430) 
[1968.029825][T17680] ? inet_autobind (net/ipv4/af_inet.c:188) 
[1968.029982][T17680] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[1968.030155][T17680] ? inet_autobind (net/ipv4/af_inet.c:188) 
[1968.030296][T17680] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 kernel/softirq.c:387) 
[1968.030441][T17680] ? inet_autobind (net/ipv4/af_inet.c:188) 
[1968.030578][T17680] ? __pfx_inet6_sendmsg (net/ipv6/af_inet6.c:652) 
[1968.030718][T17680] ? ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1968.030858][T17680] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1968.030997][T17680] ? __pfx_____sys_sendmsg (net/socket.c:2530) 
[1968.031136][T17680] ? __pfx_copy_msghdr_from_user (net/socket.c:2510) 
[1968.031309][T17680] ? lookup_memtype (arch/x86/mm/pat/memtype.c:677) 
[1968.031455][T17680] ___sys_sendmsg (net/socket.c:2640) 
[1968.031598][T17680] ? __pfx____sys_sendmsg (net/socket.c:2627) 
[1968.031736][T17680] ? udp_lib_setsockopt (net/ipv4/udp.c:2678) 
[1968.031877][T17680] ? __pfx_udp_lib_setsockopt (net/ipv4/udp.c:2671) 
[1968.032018][T17680] ? __do_fault (mm/memory.c:4531) 
[1968.032161][T17680] ? trace_kfree (./include/trace/events/kmem.h:94 (discriminator 52)) 
[1968.032300][T17680] ? kfree (mm/slub.c:4379) 
[1968.032406][T17680] ? __pfx_do_sock_setsockopt (net/socket.c:2280) 
[1968.032548][T17680] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[1968.032695][T17680] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1968.032833][T17680] ? __pfx___sys_sendmsg (net/socket.c:2655) 
[1968.032973][T17680] ? __sys_setsockopt (./include/linux/file.h:34 net/socket.c:2336) 
[1968.033115][T17680] ? __pfx___sys_setsockopt (net/socket.c:2324) 
[1968.033259][T17680] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1968.033399][T17680] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 1968.033573][T17680] RIP: 0033:0x7f2b182927b7
[ 1968.033722][T17680] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0a 00                	or     (%rax),%al
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  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 2e 00 00 00       	mov    $0x2e,%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 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

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 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[ 1968.034216][T17680] RSP: 002b:00007fff28616f48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1968.034434][T17680] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2b182927b7
[ 1968.034644][T17680] RDX: 0000000000000000 RSI: 00007fff28616fc0 RDI: 0000000000000005
[ 1968.034855][T17680] RBP: 000000002cc9e2a0 R08: 0000000000000008 R09: 00007f2b18352080
[ 1968.035064][T17680] R10: 00007f2b1814b708 R11: 0000000000000246 R12: 0000000000000005
[ 1968.035272][T17680] R13: 00007fff28616fc0 R14: 0000000000403e00 R15: 00007f2b1838d000
| [ 1968.035589][T17680] ==================================================================
| [ 1968.035884][T17680] Disabling lock debugging due to kernel taint
| [ 1968.036086][T17680] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 1968.036469][T17680] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[ 1968.036905][T17680] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[1968.037207][T17680] RIP: 0010:sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) 
[ 1968.037383][T17680] Code: 00 4c 8b bb a0 01 00 00 be 08 00 00 00 4d 8d 77 08 4c 89 f7 e8 e0 0e 8b fe 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 fe 00 00 00 49 8b 47 08 a8 04 0f 85 dc fe ff ff
All code
========
   0:	00 4c 8b bb          	add    %cl,-0x45(%rbx,%rcx,4)
   4:	a0 01 00 00 be 08 00 	movabs 0x8be000001,%al
   b:	00 00 
   d:	4d 8d 77 08          	lea    0x8(%r15),%r14
  11:	4c 89 f7             	mov    %r14,%rdi
  14:	e8 e0 0e 8b fe       	call   0xfffffffffe8b0ef9
  19:	4c 89 f2             	mov    %r14,%rdx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df 
  26:	48 c1 ea 03          	shr    $0x3,%rdx
  2a:*	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)		<-- trapping instruction
  2e:	0f 85 fe 00 00 00    	jne    0x132
  34:	49 8b 47 08          	mov    0x8(%r15),%rax
  38:	a8 04                	test   $0x4,%al
  3a:	0f 85 dc fe ff ff    	jne    0xffffffffffffff1c

Code starting with the faulting instruction
===========================================
   0:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   4:	0f 85 fe 00 00 00    	jne    0x108
   a:	49 8b 47 08          	mov    0x8(%r15),%rax
   e:	a8 04                	test   $0x4,%al
  10:	0f 85 dc fe ff ff    	jne    0xfffffffffffffef2
[ 1968.037949][T17680] RSP: 0018:ffffc90000aaf130 EFLAGS: 00010202
[ 1968.038126][T17680] RAX: dffffc0000000000 RBX: ffff8880067ce640 RCX: ffffffffb759564a
[ 1968.038408][T17680] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffffbcafda00
[ 1968.038609][T17680] RBP: ffff8880067ce6a0 R08: 0000000000000001 R09: fffffbfff795fb40
[ 1968.038810][T17680] R10: ffffffffbcafda07 R11: 205d303836373154 R12: 0000000000000000
[ 1968.039091][T17680] R13: ffff8880067ce7c0 R14: 0000000000000008 R15: 0000000000000000
[ 1968.039295][T17680] FS:  00007f2b18140740(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[ 1968.039534][T17680] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1968.039786][T17680] CR2: 00007f2b18353000 CR3: 000000000bd84006 CR4: 0000000000770ef0
[ 1968.039997][T17680] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1968.040198][T17680] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1968.040485][T17680] PKRU: 55555554
[ 1968.040589][T17680] Call Trace:
[ 1968.040695][T17680]  <TASK>
[1968.040768][T17680] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[1968.040874][T17680] ? exc_general_protection (arch/x86/kernel/traps.c:702 arch/x86/kernel/traps.c:644) 
[1968.041087][T17680] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[1968.041222][T17680] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:555) 
[1968.041326][T17680] ? sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) 
[1968.041499][T17680] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[1968.041680][T17680] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[1968.041817][T17680] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[1968.041919][T17680] dummy_xmit (drivers/net/dummy.c:66) 
[1968.042023][T17680] ? trace_net_dev_start_xmit (./include/trace/events/net.h:14 (discriminator 52)) 
[1968.042159][T17680] dev_hard_start_xmit (./include/linux/netdevice.h:4875 ./include/linux/netdevice.h:4889 net/core/dev.c:3563 net/core/dev.c:3579) 
[1968.042372][T17680] sch_direct_xmit (net/sched/sch_generic.c:343) 
[1968.042510][T17680] ? __pfx_sch_direct_xmit (net/sched/sch_generic.c:318) 
[1968.042649][T17680] ? __pfx_fq_classify (net/sched/sch_fq.c:347) sch_fq
[1968.042784][T17680] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[1968.042995][T17680] __qdisc_run (net/sched/sch_generic.c:416) 
[1968.043130][T17680] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[1968.043298][T17680] ? __pfx___qdisc_run (net/sched/sch_generic.c:412) 
[1968.043433][T17680] ? fq_enqueue (net/sched/sch_fq.c:539) sch_fq
[1968.043647][T17680] ? spin_bug (./include/linux/pid.h:232 kernel/locking/spinlock_debug.c:64 kernel/locking/spinlock_debug.c:78) 
[1968.043751][T17680] __dev_xmit_skb (./include/net/sch_generic.h:217 net/core/dev.c:3856) 
[1968.043889][T17680] ? lock_sync (kernel/locking/lockdep.c:122 kernel/locking/lockdep.c:5794) 
[1968.043992][T17680] ? __pfx___dev_xmit_skb (net/core/dev.c:3767) 
[1968.044127][T17680] __dev_queue_xmit (net/core/dev.c:4338) 
[1968.044338][T17680] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[1968.044507][T17680] ? __pfx___dev_queue_xmit (net/core/dev.c:4281) 
[1968.044643][T17680] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[1968.044777][T17680] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[1968.045072][T17680] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243) 
[1968.045179][T17680] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230) 
[1968.045314][T17680] ? __pfx_ip_generic_getfrag (net/ipv4/ip_output.c:935) 
[1968.045451][T17680] ? ip6_local_out (net/ipv6/output_core.c:154) 
[1968.045587][T17680] ip6_send_skb (net/ipv6/ip6_output.c:1956) 
[1968.045800][T17680] udp_v6_send_skb (net/ipv6/udp.c:1297) 
[1968.045935][T17680] udpv6_sendmsg (net/ipv6/udp.c:1592) 
[1968.046069][T17680] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[1968.046205][T17680] ? __pfx_ip_generic_getfrag (net/ipv4/ip_output.c:935) 
[1968.046419][T17680] ? __pfx_udpv6_sendmsg (net/ipv6/udp.c:1333) 
[1968.046557][T17680] ? reacquire_held_locks (kernel/locking/lockdep.c:5279) 
[1968.046695][T17680] ? __lock_release (kernel/locking/lockdep.c:5430) 
[1968.046828][T17680] ? inet_autobind (net/ipv4/af_inet.c:188) 
[1968.047044][T17680] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[1968.047211][T17680] ? inet_autobind (net/ipv4/af_inet.c:188) 
[1968.047343][T17680] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 kernel/softirq.c:387) 
[1968.047477][T17680] ? inet_autobind (net/ipv4/af_inet.c:188) 
[1968.047693][T17680] ? __pfx_inet6_sendmsg (net/ipv6/af_inet6.c:652) 
[1968.047828][T17680] ? ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1968.047963][T17680] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[1968.048098][T17680] ? __pfx_____sys_sendmsg (net/socket.c:2530) 
[1968.048307][T17680] ? __pfx_copy_msghdr_from_user (net/socket.c:2510) 
[1968.048473][T17680] ? lookup_memtype (arch/x86/mm/pat/memtype.c:677) 
[1968.048611][T17680] ___sys_sendmsg (net/socket.c:2640) 
[1968.048746][T17680] ? __pfx____sys_sendmsg (net/socket.c:2627) 
[1968.048960][T17680] ? udp_lib_setsockopt (net/ipv4/udp.c:2678) 
[1968.049095][T17680] ? __pfx_udp_lib_setsockopt (net/ipv4/udp.c:2671) 
[1968.049230][T17680] ? __do_fault (mm/memory.c:4531) 
[1968.049366][T17680] ? trace_kfree (./include/trace/events/kmem.h:94 (discriminator 52)) 
[1968.049502][T17680] ? kfree (mm/slub.c:4379) 
[1968.049683][T17680] ? __pfx_do_sock_setsockopt (net/socket.c:2280) 
[1968.049819][T17680] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[1968.049964][T17680] __sys_sendmsg (./include/linux/file.h:34 net/socket.c:2669) 
[1968.050103][T17680] ? __pfx___sys_sendmsg (net/socket.c:2655) 
[1968.050317][T17680] ? __sys_setsockopt (./include/linux/file.h:34 net/socket.c:2336) 
[1968.050455][T17680] ? __pfx___sys_setsockopt (net/socket.c:2324) 
[1968.050593][T17680] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1968.050729][T17680] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 1968.050972][T17680] RIP: 0033:0x7f2b182927b7
[ 1968.051111][T17680] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0a 00                	or     (%rax),%al
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  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 2e 00 00 00       	mov    $0x2e,%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 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

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 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[ 1968.051673][T17680] RSP: 002b:00007fff28616f48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1968.051877][T17680] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2b182927b7
[ 1968.052084][T17680] RDX: 0000000000000000 RSI: 00007fff28616fc0 RDI: 0000000000000005
[ 1968.052368][T17680] RBP: 000000002cc9e2a0 R08: 0000000000000008 R09: 00007f2b18352080
[ 1968.052577][T17680] R10: 00007f2b1814b708 R11: 0000000000000246 R12: 0000000000000005


Finger prints:
dump_stack_lvl:kasan_report:kasan_check_range:sock_def_write_space_wfree
sock_def_write_space_wfree:sock_wfree:skb_release_head_state:consume_skb