======================================
| [ 1894.094821][    C1] ==================================================================
| [ 1894.095188][ C1] 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) 
| [ 1894.095430][    C1] Read of size 8 at addr 0000000000000008 by task ksoftirqd/1/23
| [ 1894.095621][    C1]
[ 1894.095887][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1894.096178][    C1] Call Trace:
[ 1894.096291][    C1]  <TASK>
[ 1894.096367][ C1] dump_stack_lvl (lib/dump_stack.c:117) 
[ 1894.096523][ C1] kasan_report (mm/kasan/report.c:603) 
[ 1894.096636][ C1] ? 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) 
[ 1894.096801][ C1] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 1894.096926][ C1] 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) 
[ 1894.097051][ C1] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 1894.097145][ C1] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[ 1894.097271][ C1] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[ 1894.097364][ C1] skb_pp_cow_data (net/core/skbuff.c:987) 
[ 1894.097495][ C1] ? __pfx_skb_pp_cow_data (net/core/skbuff.c:916) 
[ 1894.097620][ C1] ? veth_xdp_rcv_skb (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 drivers/net/veth.c:775) 
[ 1894.097765][ C1] veth_xdp_rcv_skb (drivers/net/veth.c:732 drivers/net/veth.c:783) 
[ 1894.097890][ C1] ? __pfx_veth_xdp_rcv_skb (drivers/net/veth.c:765) 
[ 1894.098018][ C1] ? dev_gro_receive (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/gro.c:537) 
[ 1894.098145][ C1] ? trace_napi_gro_receive_exit (./include/trace/events/net.h:288 (discriminator 52)) 
[ 1894.098299][ C1] ? napi_gro_receive (net/core/gro.c:617) 
[ 1894.098425][ C1] veth_xdp_rcv (drivers/net/veth.c:905) 
[ 1894.098557][ C1] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 1894.098686][ C1] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 1894.098814][ C1] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:875) 
[ 1894.098940][ C1] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 1894.099067][ C1] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 1894.099192][ C1] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 1894.099344][ 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) 
[ 1894.099475][ C1] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 1894.099602][ C1] veth_poll (drivers/net/veth.c:943) 
[ 1894.099703][ C1] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 1894.099827][ C1] ? __pfx_veth_poll (drivers/net/veth.c:931) 
[ 1894.099956][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 1894.100083][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1894.100209][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 1894.100335][ C1] ? finish_task_switch.isra.0 (kernel/sched/sched.h:1397 kernel/sched/core.c:5163 kernel/sched/core.c:5281) 
[ 1894.100495][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 1894.100619][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1894.100752][ C1] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 1894.100882][ C1] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 1894.101012][ C1] ? __schedule (kernel/sched/core.c:6617) 
[ 1894.101140][ C1] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 1894.101267][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1894.101394][ C1] __do_softirq (kernel/softirq.c:554) 
[ 1894.101518][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) 
[ 1894.101647][ C1] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) 
[ 1894.101776][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 1894.101902][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1894.102027][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1894.102152][ C1] kthread (kernel/kthread.c:388) 
[ 1894.102248][ C1] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1894.102373][ C1] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1894.102501][ C1] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1894.102626][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) 
| [ 1894.102856][    C1] ==================================================================
| [ 1894.103054][    C1] Disabling lock debugging due to kernel taint
| [ 1894.103259][    C1] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 1894.103548][    C1] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[ 1894.103954][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1894.104230][ C1] 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) 
[ 1894.104403][ C1] 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
[ 1894.104861][    C1] RSP: 0018:ffffc900001af6b8 EFLAGS: 00010202
[ 1894.105022][    C1] RAX: dffffc0000000000 RBX: ffff888005960040 RCX: ffffffffa799564a
[ 1894.105205][    C1] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffffacefda00
[ 1894.105392][    C1] RBP: ffff8880059600a0 R08: 0000000000000001 R09: fffffbfff59dfb40
[ 1894.105577][    C1] R10: ffffffffacefda07 R11: 205d314320202020 R12: 0000000000000000
[ 1894.105765][    C1] R13: ffff8880059601c0 R14: 0000000000000008 R15: 0000000000000000
[ 1894.105956][    C1] FS:  0000000000000000(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[ 1894.106170][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1894.106330][    C1] CR2: 00007f15d000e000 CR3: 0000000012538001 CR4: 0000000000770ef0
[ 1894.106524][    C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1894.106717][    C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1894.106903][    C1] PKRU: 55555554
[ 1894.107005][    C1] Call Trace:
[ 1894.107100][    C1]  <TASK>
[ 1894.107167][ C1] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 1894.107282][ C1] ? exc_general_protection (arch/x86/kernel/traps.c:702 arch/x86/kernel/traps.c:644) 
[ 1894.107414][ C1] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 1894.107551][ C1] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:555) 
[ 1894.107651][ C1] ? 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) 
[ 1894.107813][ C1] ? 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) 
[ 1894.107987][ C1] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 1894.108133][ C1] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[ 1894.108432][ C1] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[ 1894.108575][ C1] skb_pp_cow_data (net/core/skbuff.c:987) 
[ 1894.108770][ C1] ? __pfx_skb_pp_cow_data (net/core/skbuff.c:916) 
[ 1894.108968][ C1] ? veth_xdp_rcv_skb (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 drivers/net/veth.c:775) 
[ 1894.109173][ C1] veth_xdp_rcv_skb (drivers/net/veth.c:732 drivers/net/veth.c:783) 
[ 1894.109500][ C1] ? __pfx_veth_xdp_rcv_skb (drivers/net/veth.c:765) 
[ 1894.109703][ C1] ? dev_gro_receive (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/gro.c:537) 
[ 1894.109910][ C1] ? trace_napi_gro_receive_exit (./include/trace/events/net.h:288 (discriminator 52)) 
[ 1894.110157][ C1] ? napi_gro_receive (net/core/gro.c:617) 
[ 1894.110602][ C1] veth_xdp_rcv (drivers/net/veth.c:905) 
[ 1894.110804][ C1] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 1894.111012][ C1] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 1894.111469][ C1] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:875) 
[ 1894.111806][ C1] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 1894.112008][ C1] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 1894.112213][ C1] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 1894.112419][ 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) 
[ 1894.112742][ C1] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 1894.112951][ C1] veth_poll (drivers/net/veth.c:943) 
[ 1894.113103][ C1] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 1894.113308][ C1] ? __pfx_veth_poll (drivers/net/veth.c:931) 
[ 1894.113503][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 1894.113817][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1894.113957][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 1894.114079][ C1] ? finish_task_switch.isra.0 (kernel/sched/sched.h:1397 kernel/sched/core.c:5163 kernel/sched/core.c:5281) 
[ 1894.114248][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 1894.114442][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1894.114566][ C1] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 1894.114695][ C1] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 1894.114819][ C1] ? __schedule (kernel/sched/core.c:6617) 
[ 1894.115012][ C1] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 1894.115136][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1894.115291][ C1] __do_softirq (kernel/softirq.c:554) 
[ 1894.115493][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) 
[ 1894.115725][ C1] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) 
[ 1894.115851][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 1894.116002][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1894.116130][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1894.116269][ C1] kthread (kernel/kthread.c:388) 
[ 1894.116362][ C1] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1894.116485][ C1] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1894.116608][ C1] ? __pfx_kthread (kernel/kthread.c:341) 


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