======================================
| [ 2003.532420][    C3] ==================================================================
| [ 2003.532715][ C3] 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) 
| [ 2003.532970][    C3] Read of size 8 at addr 0000000000000008 by task ksoftirqd/3/33
| [ 2003.533220][    C3]
[ 2003.533556][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 2003.533912][    C3] Call Trace:
[ 2003.534036][    C3]  <TASK>
[ 2003.534122][ C3] dump_stack_lvl (lib/dump_stack.c:117) 
[ 2003.534290][ C3] kasan_report (mm/kasan/report.c:603) 
[ 2003.534412][ C3] ? 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) 
[ 2003.534611][ C3] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 2003.534767][ C3] 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) 
[ 2003.534927][ C3] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 2003.535052][ C3] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[ 2003.535212][ C3] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[ 2003.535338][ C3] skb_pp_cow_data (net/core/skbuff.c:987) 
[ 2003.535501][ C3] ? __pfx_skb_pp_cow_data (net/core/skbuff.c:916) 
[ 2003.535668][ C3] ? veth_xdp_rcv_skb (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 drivers/net/veth.c:775) 
[ 2003.535838][ C3] veth_xdp_rcv_skb (drivers/net/veth.c:732 drivers/net/veth.c:783) 
[ 2003.535992][ C3] ? __pfx_veth_xdp_rcv_skb (drivers/net/veth.c:765) 
[ 2003.536152][ C3] ? 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) 
[ 2003.536312][ C3] ? trace_napi_gro_receive_exit (./include/trace/events/net.h:288 (discriminator 52)) 
[ 2003.536504][ C3] ? napi_gro_receive (net/core/gro.c:617) 
[ 2003.536659][ C3] veth_xdp_rcv (drivers/net/veth.c:905) 
[ 2003.536816][ C3] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:875) 
[ 2003.536974][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 2003.537142][ C3] ? 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) 
[ 2003.537298][ C3] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 2003.537458][ C3] veth_poll (drivers/net/veth.c:943) 
[ 2003.537575][ C3] ? __pfx_veth_poll (drivers/net/veth.c:931) 
[ 2003.537730][ C3] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 2003.537851][ C3] ? 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) 
[ 2003.538008][ C3] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 2003.538128][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 2003.538291][ C3] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 2003.538448][ C3] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 2003.538610][ C3] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 2003.538771][ C3] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 2003.538924][ C3] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 2003.539083][ C3] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 2003.539239][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 2003.539398][ C3] __do_softirq (kernel/softirq.c:554) 
[ 2003.539550][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) 
[ 2003.539712][ C3] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) 
[ 2003.539870][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 2003.540029][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 2003.540185][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 2003.540341][ C3] kthread (kernel/kthread.c:388) 
[ 2003.540460][ C3] ? __pfx_kthread (kernel/kthread.c:341) 
[ 2003.540615][ C3] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 2003.540774][ C3] ? __pfx_kthread (kernel/kthread.c:341) 
[ 2003.540928][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) 
| [ 2003.541214][    C3] ==================================================================
| [ 2003.541909][    C3] Disabling lock debugging due to kernel taint
| [ 2003.542144][    C3] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 2003.542488][    C3] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[ 2003.542985][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 2003.543339][ C3] 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) 
[ 2003.543549][ C3] 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
[ 2003.544106][    C3] RSP: 0018:ffffc9000025f6b8 EFLAGS: 00010202
[ 2003.544314][    C3] RAX: dffffc0000000000 RBX: ffff888003bd4dc0 RCX: ffffffffb899564a
[ 2003.544556][    C3] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffffbdefda00
[ 2003.544788][    C3] RBP: ffff888003bd4e20 R08: 0000000000000001 R09: fffffbfff7bdfb40
[ 2003.545021][    C3] R10: ffffffffbdefda07 R11: 205d334320202020 R12: 0000000000000000
[ 2003.545250][    C3] R13: ffff888003bd4f40 R14: 0000000000000008 R15: 0000000000000000
[ 2003.545478][    C3] FS:  0000000000000000(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[ 2003.545753][    C3] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2003.545945][    C3] CR2: 00007f1b860b7000 CR3: 000000000d138006 CR4: 0000000000770ef0
[ 2003.546189][    C3] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2003.546418][    C3] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2003.546645][    C3] PKRU: 55555554
[ 2003.546768][    C3] Call Trace:
[ 2003.546887][    C3]  <TASK>
[ 2003.546972][ C3] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 2003.547091][ C3] ? exc_general_protection (arch/x86/kernel/traps.c:702 arch/x86/kernel/traps.c:644) 
[ 2003.547251][ C3] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 2003.547411][ C3] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:555) 
[ 2003.547532][ C3] ? 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) 
[ 2003.547723][ C3] ? 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) 
[ 2003.547915][ C3] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 2003.548032][ C3] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[ 2003.548189][ C3] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[ 2003.548300][ C3] skb_pp_cow_data (net/core/skbuff.c:987) 
[ 2003.548456][ C3] ? __pfx_skb_pp_cow_data (net/core/skbuff.c:916) 
[ 2003.548611][ C3] ? veth_xdp_rcv_skb (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 drivers/net/veth.c:775) 
[ 2003.548768][ C3] veth_xdp_rcv_skb (drivers/net/veth.c:732 drivers/net/veth.c:783) 
[ 2003.548924][ C3] ? __pfx_veth_xdp_rcv_skb (drivers/net/veth.c:765) 
[ 2003.549073][ C3] ? 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) 
[ 2003.549227][ C3] ? trace_napi_gro_receive_exit (./include/trace/events/net.h:288 (discriminator 52)) 
[ 2003.549417][ C3] ? napi_gro_receive (net/core/gro.c:617) 
[ 2003.549570][ C3] veth_xdp_rcv (drivers/net/veth.c:905) 
[ 2003.549726][ C3] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:875) 
[ 2003.549883][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 2003.550039][ C3] ? 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) 
[ 2003.550190][ C3] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 2003.550346][ C3] veth_poll (drivers/net/veth.c:943) 
[ 2003.550464][ C3] ? __pfx_veth_poll (drivers/net/veth.c:931) 
[ 2003.550620][ C3] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 2003.550737][ C3] ? 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) 
[ 2003.550893][ C3] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 2003.551009][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 2003.551169][ C3] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 2003.551321][ C3] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 2003.551480][ C3] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 2003.551632][ C3] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 2003.551786][ C3] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 2003.551935][ C3] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 2003.552084][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 2003.552234][ C3] __do_softirq (kernel/softirq.c:554) 
[ 2003.552392][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) 
[ 2003.552543][ C3] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) 
[ 2003.552695][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 2003.552852][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 2003.553003][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 2003.553153][ C3] kthread (kernel/kthread.c:388) 
[ 2003.553276][ C3] ? __pfx_kthread (kernel/kthread.c:341) 
[ 2003.553430][ C3] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 2003.553589][ C3] ? __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