======================================
| [ 1859.714455][    C0] ==================================================================
| [ 1859.714752][ C0] 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) 
| [ 1859.714949][    C0] Read of size 8 at addr 0000000000000008 by task ksoftirqd/0/15
| [ 1859.715140][    C0]
[ 1859.715422][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1859.715717][    C0] Call Trace:
[ 1859.715833][    C0]  <TASK>
[ 1859.715910][ C0] dump_stack_lvl (lib/dump_stack.c:117) 
[ 1859.716056][ C0] kasan_report (mm/kasan/report.c:603) 
[ 1859.716159][ C0] ? 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) 
[ 1859.716327][ C0] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 1859.716457][ C0] 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) 
[ 1859.716589][ C0] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 1859.716690][ C0] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[ 1859.716822][ C0] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[ 1859.716917][ C0] skb_pp_cow_data (net/core/skbuff.c:987) 
[ 1859.717044][ C0] ? __pfx_skb_pp_cow_data (net/core/skbuff.c:916) 
[ 1859.717170][ C0] ? veth_xdp_rcv_skb (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 drivers/net/veth.c:775) 
[ 1859.717297][ C0] veth_xdp_rcv_skb (drivers/net/veth.c:732 drivers/net/veth.c:783) 
[ 1859.717424][ C0] ? __pfx_veth_xdp_rcv_skb (drivers/net/veth.c:765) 
[ 1859.717548][ C0] ? 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) 
[ 1859.717678][ C0] ? trace_napi_gro_receive_exit (./include/trace/events/net.h:288 (discriminator 52)) 
[ 1859.717833][ C0] ? napi_gro_receive (net/core/gro.c:617) 
[ 1859.717960][ C0] veth_xdp_rcv (drivers/net/veth.c:905) 
[ 1859.718086][ C0] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 1859.718212][ C0] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 1859.718336][ C0] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:875) 
[ 1859.718464][ C0] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 1859.718588][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 1859.718715][ C0] ? 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) 
[ 1859.718840][ C0] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 1859.719175][ C0] veth_poll (drivers/net/veth.c:943) 
[ 1859.719269][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 1859.719397][ C0] ? __pfx_veth_poll (drivers/net/veth.c:931) 
[ 1859.719523][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 1859.719649][ C0] ? trace_pelt_cfs_tp (./include/trace/events/sched.h:743 (discriminator 52)) 
[ 1859.719774][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1859.719900][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 1859.720028][ C0] ? finish_task_switch.isra.0 (kernel/sched/sched.h:1397 kernel/sched/core.c:5163 kernel/sched/core.c:5281) 
[ 1859.720187][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 1859.720312][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1859.720439][ C0] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 1859.720568][ C0] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 1859.720696][ C0] ? __schedule (kernel/sched/core.c:6617) 
[ 1859.720823][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 1859.720951][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1859.721080][ C0] __do_softirq (kernel/softirq.c:554) 
[ 1859.721211][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) 
[ 1859.721338][ C0] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) 
[ 1859.721463][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 1859.721590][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1859.721715][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1859.721839][ C0] kthread (kernel/kthread.c:388) 
[ 1859.721933][ C0] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1859.722060][ C0] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1859.722191][ C0] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1859.722318][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) 
| [ 1859.722541][    C0] ==================================================================
| [ 1859.722742][    C0] Disabling lock debugging due to kernel taint
| [ 1859.722930][    C0] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 1859.723203][    C0] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[ 1859.723602][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1859.723875][ C0] 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) 
[ 1859.724036][ C0] 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
[ 1859.724489][    C0] RSP: 0018:ffffc900000ff6b8 EFLAGS: 00010202
[ 1859.724649][    C0] RAX: dffffc0000000000 RBX: ffff888003d73680 RCX: ffffffff85b9564a
[ 1859.724842][    C0] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8b0fda00
[ 1859.725032][    C0] RBP: ffff888003d736e0 R08: 0000000000000001 R09: fffffbfff161fb40
[ 1859.725219][    C0] R10: ffffffff8b0fda07 R11: 205d304320202020 R12: 0000000000000000
[ 1859.725409][    C0] R13: ffff888003d73800 R14: 0000000000000008 R15: 0000000000000000
[ 1859.725591][    C0] FS:  0000000000000000(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[ 1859.725805][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1859.725964][    C0] CR2: 00007ff02c27f000 CR3: 000000001fd38001 CR4: 0000000000770ef0
[ 1859.726518][    C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1859.726699][    C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1859.726884][    C0] PKRU: 55555554
[ 1859.726978][    C0] Call Trace:
[ 1859.727071][    C0]  <TASK>
[ 1859.727134][ C0] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 1859.727229][ C0] ? exc_general_protection (arch/x86/kernel/traps.c:702 arch/x86/kernel/traps.c:644) 
[ 1859.727360][ C0] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 1859.727484][ C0] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:555) 
[ 1859.727577][ C0] ? 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) 
[ 1859.727730][ C0] ? 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) 
[ 1859.727882][ C0] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 1859.727978][ C0] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[ 1859.728101][ C0] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[ 1859.728203][ C0] skb_pp_cow_data (net/core/skbuff.c:987) 
[ 1859.728325][ C0] ? __pfx_skb_pp_cow_data (net/core/skbuff.c:916) 
[ 1859.728459][ C0] ? veth_xdp_rcv_skb (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 drivers/net/veth.c:775) 
[ 1859.728582][ C0] veth_xdp_rcv_skb (drivers/net/veth.c:732 drivers/net/veth.c:783) 
[ 1859.728705][ C0] ? __pfx_veth_xdp_rcv_skb (drivers/net/veth.c:765) 
[ 1859.728827][ C0] ? 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) 
[ 1859.728952][ C0] ? trace_napi_gro_receive_exit (./include/trace/events/net.h:288 (discriminator 52)) 
[ 1859.729105][ C0] ? napi_gro_receive (net/core/gro.c:617) 
[ 1859.729231][ C0] veth_xdp_rcv (drivers/net/veth.c:905) 
[ 1859.729354][ C0] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 1859.729479][ C0] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 1859.729603][ C0] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:875) 
[ 1859.729727][ C0] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 1859.729849][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 1859.729973][ C0] ? 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) 
[ 1859.730095][ C0] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 1859.730219][ C0] veth_poll (drivers/net/veth.c:943) 
[ 1859.730314][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 1859.730435][ C0] ? __pfx_veth_poll (drivers/net/veth.c:931) 
[ 1859.730562][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 1859.730687][ C0] ? trace_pelt_cfs_tp (./include/trace/events/sched.h:743 (discriminator 52)) 
[ 1859.730812][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1859.730938][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 1859.731064][ C0] ? finish_task_switch.isra.0 (kernel/sched/sched.h:1397 kernel/sched/core.c:5163 kernel/sched/core.c:5281) 
[ 1859.731219][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 1859.731347][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1859.731473][ C0] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 1859.731666][ C0] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 1859.731791][ C0] ? __schedule (kernel/sched/core.c:6617) 
[ 1859.731914][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 1859.732038][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1859.732230][ C0] __do_softirq (kernel/softirq.c:554) 
[ 1859.732354][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) 
[ 1859.732475][ C0] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) 
[ 1859.732598][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 1859.732719][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1859.732922][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1859.733042][ C0] kthread (kernel/kthread.c:388) 
[ 1859.733136][ C0] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1859.733258][ C0] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1859.733514][ C0] ? __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