======================================
| [ 1862.337429][    C0] ==================================================================
| [ 1862.337815][ 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) 
| [ 1862.338169][    C0] Read of size 8 at addr 0000000000000008 by task ksoftirqd/0/15
| [ 1862.338497][    C0]
[ 1862.338968][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1862.339458][    C0] Call Trace:
[ 1862.339635][    C0]  <TASK>
[ 1862.339751][ C0] dump_stack_lvl (lib/dump_stack.c:117) 
[ 1862.339978][ C0] kasan_report (mm/kasan/report.c:603) 
[ 1862.340154][ 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) 
[ 1862.340439][ C0] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 1862.340654][ 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) 
[ 1862.340871][ C0] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 1862.341050][ C0] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[ 1862.341276][ C0] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[ 1862.341454][ C0] skb_pp_cow_data (net/core/skbuff.c:987) 
[ 1862.341672][ C0] ? __pfx_skb_pp_cow_data (net/core/skbuff.c:916) 
[ 1862.341891][ C0] ? veth_xdp_rcv_skb (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 drivers/net/veth.c:775) 
[ 1862.342121][ C0] veth_xdp_rcv_skb (drivers/net/veth.c:732 drivers/net/veth.c:783) 
[ 1862.342341][ C0] ? __pfx_veth_xdp_rcv_skb (drivers/net/veth.c:765) 
[ 1862.342568][ 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) 
[ 1862.342786][ C0] ? trace_napi_gro_receive_exit (./include/trace/events/net.h:288 (discriminator 52)) 
[ 1862.343062][ C0] ? napi_gro_receive (net/core/gro.c:617) 
[ 1862.343296][ C0] veth_xdp_rcv (drivers/net/veth.c:905) 
[ 1862.343526][ C0] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:875) 
[ 1862.343758][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 1862.343978][ 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) 
[ 1862.344207][ C0] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 1862.344431][ C0] veth_poll (drivers/net/veth.c:943) 
[ 1862.344603][ C0] ? __pfx_veth_poll (drivers/net/veth.c:931) 
[ 1862.344832][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 1862.345001][ 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) 
[ 1862.345233][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 1862.345401][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 1862.345616][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 1862.345835][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1862.346057][ C0] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 1862.346287][ C0] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 1862.346514][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 1862.346733][ C0] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 1862.346944][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1862.347181][ C0] __do_softirq (kernel/softirq.c:554) 
[ 1862.347407][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) 
[ 1862.347635][ C0] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) 
[ 1862.347871][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 1862.348105][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1862.348331][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1862.348565][ C0] kthread (kernel/kthread.c:388) 
[ 1862.348739][ C0] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1862.348969][ C0] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1862.349207][ C0] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1862.349426][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) 
| [ 1862.349819][    C0] ==================================================================
| [ 1862.350161][    C0] Disabling lock debugging due to kernel taint
| [ 1862.350482][    C0] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 1862.350966][    C0] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[ 1862.351667][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1862.352158][ 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) 
[ 1862.352449][ 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
[ 1862.353232][    C0] RSP: 0018:ffffc900000ff6b8 EFLAGS: 00010202
[ 1862.353526][    C0] RAX: dffffc0000000000 RBX: ffff888003e72700 RCX: ffffffff9df9564a
[ 1862.353880][    C0] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffffa34fda00
[ 1862.354230][    C0] RBP: ffff888003e72760 R08: 0000000000000001 R09: fffffbfff469fb40
[ 1862.354569][    C0] R10: ffffffffa34fda07 R11: 205d304320202020 R12: 0000000000000000
[ 1862.354909][    C0] R13: ffff888003e72880 R14: 0000000000000008 R15: 0000000000000000
[ 1862.355249][    C0] FS:  0000000000000000(0000) GS:ffff88802f600000(0000) knlGS:0000000000000000
[ 1862.355645][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1862.355912][    C0] CR2: 00007f78b8e5b000 CR3: 0000000037538001 CR4: 0000000000770ef0
[ 1862.356223][    C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1862.356534][    C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1862.356848][    C0] PKRU: 55555554
[ 1862.357009][    C0] Call Trace:
[ 1862.357177][    C0]  <TASK>
[ 1862.357281][ C0] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 1862.357442][ C0] ? exc_general_protection (arch/x86/kernel/traps.c:702 arch/x86/kernel/traps.c:644) 
[ 1862.357659][ C0] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 1862.357865][ C0] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:555) 
[ 1862.358022][ 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) 
[ 1862.358286][ 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) 
[ 1862.358559][ C0] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 1862.358728][ C0] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) 
[ 1862.358947][ C0] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) 
[ 1862.359106][ C0] skb_pp_cow_data (net/core/skbuff.c:987) 
[ 1862.359312][ C0] ? __pfx_skb_pp_cow_data (net/core/skbuff.c:916) 
[ 1862.359511][ C0] ? veth_xdp_rcv_skb (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 drivers/net/veth.c:775) 
[ 1862.359718][ C0] veth_xdp_rcv_skb (drivers/net/veth.c:732 drivers/net/veth.c:783) 
[ 1862.359920][ C0] ? __pfx_veth_xdp_rcv_skb (drivers/net/veth.c:765) 
[ 1862.360124][ 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) 
[ 1862.360331][ C0] ? trace_napi_gro_receive_exit (./include/trace/events/net.h:288 (discriminator 52)) 
[ 1862.360588][ C0] ? napi_gro_receive (net/core/gro.c:617) 
[ 1862.360793][ C0] veth_xdp_rcv (drivers/net/veth.c:905) 
[ 1862.361001][ C0] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:875) 
[ 1862.361212][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 1862.361423][ 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) 
[ 1862.361624][ C0] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 1862.361834][ C0] veth_poll (drivers/net/veth.c:943) 
[ 1862.361996][ C0] ? __pfx_veth_poll (drivers/net/veth.c:931) 
[ 1862.362204][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 1862.362371][ 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) 
[ 1862.362580][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 1862.362744][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 1862.362963][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 1862.363172][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 1862.363399][ C0] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 1862.363625][ C0] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 1862.363886][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 1862.364102][ C0] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 1862.364319][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1862.364540][ C0] __do_softirq (kernel/softirq.c:554) 
[ 1862.364755][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) 
[ 1862.364964][ C0] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) 
[ 1862.365178][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 1862.365389][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1862.365606][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 1862.365831][ C0] kthread (kernel/kthread.c:388) 
[ 1862.366001][ C0] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1862.366214][ C0] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1862.366430][ 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