======================================
| [ 4549.598250][    C0] ==================================================================
| [ 4549.598682][ 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) 
| [ 4549.598922][    C0] Read of size 8 at addr 0000000000000008 by task swapper/0/0
| [ 4549.599147][    C0]
[ 4549.599458][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 4549.599791][    C0] Call Trace:
[ 4549.599909][    C0]  <IRQ>
[ 4549.599987][ C0] dump_stack_lvl (lib/dump_stack.c:117) 
[ 4549.600149][ C0] kasan_report (mm/kasan/report.c:603) 
[ 4549.600263][ 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) 
[ 4549.600448][ C0] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 4549.600601][ 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) 
[ 4549.600752][ C0] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 4549.600869][ C0] ip6_rcv_core (./include/linux/skbuff.h:3202 net/ipv6/ip6_input.c:291) 
[ 4549.601025][ C0] ipv6_rcv (net/ipv6/ip6_input.c:307) 
[ 4549.601138][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 4549.601289][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 4549.601443][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) 
[ 4549.601594][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 4549.601739][ C0] __netif_receive_skb_one_core (net/core/dev.c:5597) 
[ 4549.601923][ C0] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5597) 
[ 4549.602113][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) 
[ 4549.602262][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 4549.602409][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) 
[ 4549.602555][ C0] process_backlog (./include/linux/rcupdate.h:810 net/core/dev.c:6048) 
[ 4549.602706][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 4549.602854][ C0] ? rebalance_domains (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 kernel/sched/fair.c:11753) 
[ 4549.603006][ C0] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 4549.603155][ C0] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 4549.603315][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 4549.603462][ C0] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 4549.603610][ C0] ? __pfx_rebalance_domains (kernel/sched/fair.c:11684) 
[ 4549.603757][ C0] __do_softirq (kernel/softirq.c:554) 
[ 4549.603906][ C0] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 4549.604020][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[ 4549.604170][    C0]  </IRQ>
[ 4549.604246][    C0]  <TASK>
[ 4549.604319][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 4549.604509][ C0] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 4549.604664][ C0] Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 cc 32 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
All code
========
   0:	4c 01 c7             	add    %r8,%rdi
   3:	4c 29 c2             	sub    %r8,%rdx
   6:	e9 72 ff ff ff       	jmp    0xffffffffffffff7d
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d e3 cc 32 00 	verw   0x32cce3(%rip)        # 0x32cd0b
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	fa                   	cli		<-- trapping instruction
  2b:	c3                   	ret
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  37:	00 00 00 00 
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	fa                   	cli
   1:	c3                   	ret
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   d:	00 00 00 00 
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[ 4549.605182][    C0] RSP: 0018:ffffffffb1807e00 EFLAGS: 00000246
[ 4549.605374][    C0] RAX: 00000000022cd92b RBX: 1ffffffff6300fc2 RCX: ffffffffb0934e95
[ 4549.605596][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffae0ac0e4
[ 4549.605815][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0709c
[ 4549.606036][    C0] R10: ffff8880360384e3 R11: ffff88803602d9b0 R12: 0000000000000000
[ 4549.606255][    C0] R13: ffffffffb1831000 R14: dffffc0000000000 R15: 0000000000014770
[ 4549.606475][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 4549.606622][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 4549.606769][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 4549.606915][ C0] cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 4549.607064][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 4549.607213][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 4549.607362][ C0] do_idle (kernel/sched/idle.c:332) 
[ 4549.607474][ C0] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 4549.607623][ C0] rest_init (./include/linux/rcupdate.h:782 init/main.c:703) 
[ 4549.607742][ C0] start_kernel (init/main.c:1024 (discriminator 1)) 
[ 4549.607891][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:495) 
[ 4549.608041][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:437 (discriminator 17)) 
[ 4549.608188][ C0] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [ 4549.608462][    C0] ==================================================================
| [ 4549.608675][    C0] Disabling lock debugging due to kernel taint
| [ 4549.608891][    C0] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 4549.609225][    C0] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[ 4549.609695][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 4549.610015][ 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) 
[ 4549.610204][ 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
[ 4549.610707][    C0] RSP: 0018:ffffc90000007b28 EFLAGS: 00010202
[ 4549.610891][    C0] RAX: dffffc0000000000 RBX: ffff888004858040 RCX: ffffffffadf9564a
[ 4549.611112][    C0] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffffb34fda00
[ 4549.611325][    C0] RBP: ffff8880048580a0 R08: 0000000000000001 R09: fffffbfff669fb40
[ 4549.611539][    C0] R10: ffffffffb34fda07 R11: 205d304320202020 R12: 0000000000000000
[ 4549.611752][    C0] R13: ffff8880048581c0 R14: 0000000000000008 R15: 0000000000000000
[ 4549.611963][    C0] FS:  0000000000000000(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[ 4549.612218][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4549.612402][    C0] CR2: 00007fc8a7bd7520 CR3: 000000000b194002 CR4: 0000000000770ef0
[ 4549.612616][    C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4549.612833][    C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4549.613049][    C0] PKRU: 55555554
[ 4549.613164][    C0] Call Trace:
[ 4549.613273][    C0]  <IRQ>
[ 4549.613350][ C0] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 4549.613463][ C0] ? exc_general_protection (arch/x86/kernel/traps.c:702 arch/x86/kernel/traps.c:644) 
[ 4549.613610][ C0] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 4549.613755][ C0] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:555) 
[ 4549.613867][ 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) 
[ 4549.614046][ 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) 
[ 4549.614225][ C0] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) 
[ 4549.614338][ C0] ip6_rcv_core (./include/linux/skbuff.h:3202 net/ipv6/ip6_input.c:291) 
[ 4549.614485][ C0] ipv6_rcv (net/ipv6/ip6_input.c:307) 
[ 4549.614594][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 4549.614736][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 4549.614879][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) 
[ 4549.615024][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 4549.615167][ C0] __netif_receive_skb_one_core (net/core/dev.c:5597) 
[ 4549.615346][ C0] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5597) 
[ 4549.615526][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) 
[ 4549.615669][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 4549.615813][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) 
[ 4549.615957][ C0] process_backlog (./include/linux/rcupdate.h:810 net/core/dev.c:6048) 
[ 4549.616100][ C0] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 4549.616242][ C0] ? rebalance_domains (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 kernel/sched/fair.c:11753) 
[ 4549.616388][ C0] __napi_poll.constprop.0 (net/core/dev.c:6701) 
[ 4549.616535][ C0] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) 
[ 4549.616679][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 4549.616824][ C0] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 4549.616971][ C0] ? __pfx_rebalance_domains (kernel/sched/fair.c:11684) 
[ 4549.617117][ C0] __do_softirq (kernel/softirq.c:554) 
[ 4549.617265][ C0] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 4549.617375][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[ 4549.617521][    C0]  </IRQ>
[ 4549.617594][    C0]  <TASK>
[ 4549.617669][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 4549.617851][ C0] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 4549.617998][ C0] Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 cc 32 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
All code
========
   0:	4c 01 c7             	add    %r8,%rdi
   3:	4c 29 c2             	sub    %r8,%rdx
   6:	e9 72 ff ff ff       	jmp    0xffffffffffffff7d
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d e3 cc 32 00 	verw   0x32cce3(%rip)        # 0x32cd0b
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	fa                   	cli		<-- trapping instruction
  2b:	c3                   	ret
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  37:	00 00 00 00 
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	fa                   	cli
   1:	c3                   	ret
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   d:	00 00 00 00 
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[ 4549.618516][    C0] RSP: 0018:ffffffffb1807e00 EFLAGS: 00000246
[ 4549.618701][    C0] RAX: 00000000022cd92b RBX: 1ffffffff6300fc2 RCX: ffffffffb0934e95
[ 4549.618914][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffae0ac0e4
[ 4549.619129][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0709c
[ 4549.619346][    C0] R10: ffff8880360384e3 R11: ffff88803602d9b0 R12: 0000000000000000
[ 4549.619563][    C0] R13: ffffffffb1831000 R14: dffffc0000000000 R15: 0000000000014770
[ 4549.619776][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 4549.619917][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 4549.620064][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 4549.620208][ C0] cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 4549.620350][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 4549.620491][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 4549.620634][ C0] do_idle (kernel/sched/idle.c:332) 
[ 4549.620742][ C0] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 4549.620886][ C0] rest_init (./include/linux/rcupdate.h:782 init/main.c:703) 
[ 4549.620993][ C0] start_kernel (init/main.c:1024 (discriminator 1)) 
[ 4549.621141][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:495) 
[ 4549.621282][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:437 (discriminator 17)) 


Finger prints:
dump_stack_lvl:kasan_report:kasan_check_range:sock_def_write_space_wfree
sock_def_write_space_wfree:sock_wfree:ip6_rcv_core:ipv6_rcv