======================================
| [   81.671951][    C1] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)
| [   81.672238][    C1] ------------[ cut here ]------------
| [   81.672434][    C1] kernel BUG at include/linux/mm.h:1140!
| [   81.672650][    C1] Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   81.673122][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 81.673460][ C1] RIP: 0010:__free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 81.673620][ C1] Code: 0f 94 c3 e9 ba fe ff ff 48 c7 c6 a0 18 98 bb 4c 89 e7 e8 df bf f4 ff 90 0f 0b 48 c7 c6 40 29 98 bb 4c 89 e7 e8 cd bf f4 ff 90 <0f> 0b 48 89 ef e8 72 03 09 00 e9 c5 fe ff ff e8 98 03 09 00 e9 35
All code
========
   0:	0f 94 c3             	sete   %bl
   3:	e9 ba fe ff ff       	jmp    0xfffffffffffffec2
   8:	48 c7 c6 a0 18 98 bb 	mov    $0xffffffffbb9818a0,%rsi
   f:	4c 89 e7             	mov    %r12,%rdi
  12:	e8 df bf f4 ff       	call   0xfffffffffff4bff6
  17:	90                   	nop
  18:	0f 0b                	ud2
  1a:	48 c7 c6 40 29 98 bb 	mov    $0xffffffffbb982940,%rsi
  21:	4c 89 e7             	mov    %r12,%rdi
  24:	e8 cd bf f4 ff       	call   0xfffffffffff4bff6
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	48 89 ef             	mov    %rbp,%rdi
  2f:	e8 72 03 09 00       	call   0x903a6
  34:	e9 c5 fe ff ff       	jmp    0xfffffffffffffefe
  39:	e8 98 03 09 00       	call   0x903d6
  3e:	e9                   	.byte 0xe9
  3f:	35                   	.byte 0x35

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	48 89 ef             	mov    %rbp,%rdi
   5:	e8 72 03 09 00       	call   0x9037c
   a:	e9 c5 fe ff ff       	jmp    0xfffffffffffffed4
   f:	e8 98 03 09 00       	call   0x903ac
  14:	e9                   	.byte 0xe9
  15:	35                   	.byte 0x35
[   81.674206][    C1] RSP: 0018:ffffc900001e8df8 EFLAGS: 00010246
[   81.674407][    C1] RAX: 000000000000003e RBX: 0000000000000000 RCX: 1ffffffff78bb43c
[   81.674670][    C1] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   81.674907][    C1] RBP: ffffea000017b334 R08: 0000000000000000 R09: fffffbfff78bb43c
[   81.675141][    C1] R10: 0000000000000003 R11: 205d314320202020 R12: ffffea000017b300
[   81.675386][    C1] R13: ffffc900001e8ec0 R14: 0000000000000000 R15: 0000000000000007
[   81.675621][    C1] FS:  00007f51e7d9c740(0000) GS:ffff88802f680000(0000) knlGS:0000000000000000
[   81.675923][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   81.676156][    C1] CR2: 00007f51e7dd6230 CR3: 00000000082d2004 CR4: 0000000000772ef0
[   81.676392][    C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   81.676642][    C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   81.676910][    C1] PKRU: 55555554
[   81.677034][    C1] Call Trace:
[   81.677162][    C1]  <IRQ>
[ 81.677244][ C1] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 81.677375][ C1] ? do_trap (arch/x86/kernel/traps.c:156 arch/x86/kernel/traps.c:197) 
[ 81.677494][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 81.677653][ C1] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:218) 
[ 81.677815][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 81.677973][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 81.678132][ C1] ? handle_invalid_op (arch/x86/kernel/traps.c:256) 
[ 81.678288][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 81.678444][ C1] ? exc_invalid_op (arch/x86/kernel/traps.c:315) 
[ 81.678602][ C1] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 81.678771][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 81.678930][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 81.679086][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2567) 
[ 81.679245][ C1] neigh_hash_free_rcu (net/core/neighbour.c:555) 
[ 81.679411][ C1] rcu_do_batch (kernel/rcu/tree.c:2567) 
[ 81.679569][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2491) 
[ 81.679725][ C1] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4339 kernel/locking/lockdep.c:4406) 
[ 81.679938][ C1] rcu_core (kernel/rcu/tree.c:2825) 
[ 81.680050][ C1] handle_softirqs (kernel/softirq.c:554) 
[ 81.680202][ C1] irq_exit_rcu (kernel/softirq.c:589 kernel/softirq.c:428 kernel/softirq.c:637 kernel/softirq.c:649) 
[ 81.680310][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1037 arch/x86/kernel/apic/apic.c:1037) 
[   81.680459][    C1]  </IRQ>
[   81.680533][    C1]  <TASK>
[ 81.680611][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 81.680801][ C1] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 81.680999][ C1] Code: 10 e8 c1 9d 87 fd 48 89 ef e8 d9 0e 88 fd 81 e3 00 02 00 00 75 1d 9c 58 f6 c4 02 75 29 48 85 db 74 01 fb 65 ff 0d 55 0b bb 44 <74> 0e 5b 5d c3 cc cc cc cc e8 8f e0 ac fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	c1 9d 87 fd 48 89 ef 	rcrl   $0xef,-0x76b70279(%rbp)
   9:	e8 d9 0e 88 fd       	call   0xfffffffffd880ee7
   e:	81 e3 00 02 00 00    	and    $0x200,%ebx
  14:	75 1d                	jne    0x33
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	75 29                	jne    0x46
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	65 ff 0d 55 0b bb 44 	decl   %gs:0x44bb0b55(%rip)        # 0x44bb0b7f
  2a:*	74 0e                	je     0x3a		<-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	e8 8f e0 ac fd       	call   0xfffffffffdace0c7
  38:	eb dc                	jmp    0x16
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	5b                   	pop    %rbx

Code starting with the faulting instruction
===========================================
   0:	74 0e                	je     0x10
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	e8 8f e0 ac fd       	call   0xfffffffffdace09d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   81.681520][    C1] RSP: 0018:ffffc90000a9f658 EFLAGS: 00000246
[   81.681704][    C1] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff7cfbaf2
[   81.681927][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffbb48bd81
[   81.682162][    C1] RBP: ffff88800104f440 R08: 0000000000000001 R09: fffffbfff7cf99c9
[   81.682400][    C1] R10: ffffffffbe7cce4f R11: ffffc90000a9f489 R12: ffff8880020edc10
[   81.682645][    C1] R13: 0000000000000000 R14: ffffc90000a9f6a8 R15: ffff8880028eeb00
[ 81.682908][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 81.683111][ C1] qlist_free_all (mm/kasan/quarantine.c:174) 
[ 81.683285][ C1] kasan_quarantine_reduce (./include/linux/srcu.h:320 mm/kasan/quarantine.c:287) 
[ 81.683449][ C1] __kasan_slab_alloc (mm/kasan/common.c:329) 
[ 81.683613][ C1] kmem_cache_alloc_node_noprof (mm/slub.c:4086 mm/slub.c:4134 mm/slub.c:4186) 
[ 81.683813][ C1] __alloc_skb (net/core/skbuff.c:668) 
[ 81.683984][ C1] ? __pfx___alloc_skb (net/core/skbuff.c:651) 
[ 81.684158][ C1] ? fib4_rule_action.part.0 (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/ipv4/fib_rules.c:141) 
[ 81.684309][ C1] ? fib_rules_lookup (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/fib_rules.c:342) 
[ 81.684499][ C1] alloc_skb_with_frags (./include/linux/skbuff.h:1325 net/core/skbuff.c:6622) 
[ 81.684656][ C1] ? __pfx_fib_rules_lookup (net/core/fib_rules.c:295) 
[ 81.684825][ C1] ? l3mdev_update_flow (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/l3mdev/l3mdev.c:299) 
[ 81.684990][ C1] sock_alloc_send_pskb (net/core/sock.c:2874) 
[ 81.685135][ C1] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 81.685287][ C1] ? __pfx_sock_alloc_send_pskb (net/core/sock.c:2845) 
[ 81.685471][ C1] ? __mkroute_output (./arch/x86/include/asm/atomic.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2401 ./include/linux/atomic/atomic-instrumented.h:1476 ./include/linux/rcuref.h:67 ./include/net/dst.h:302 net/ipv4/route.c:2566) 
[ 81.685644][ C1] ? ip_route_output_key_hash (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/ipv4/route.c:2623) 
[ 81.685807][ C1] raw_send_hdrinc (./include/net/sock.h:1797 net/ipv4/raw.c:353) 
[ 81.685972][ C1] ? __pfx_raw_send_hdrinc (net/ipv4/raw.c:330) 
[ 81.686146][ C1] raw_sendmsg (net/ipv4/raw.c:644) 
[ 81.686314][ C1] ? __pfx_raw_sendmsg (net/ipv4/raw.c:483) 
[ 81.686482][ C1] ? usage_skip (kernel/locking/lockdep.c:2314 kernel/locking/lockdep.c:2282) 
[ 81.686648][ C1] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 81.686807][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 81.686973][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 81.687130][ C1] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 81.687293][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 81.687451][ C1] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 81.687610][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 81.687774][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 81.687933][ C1] __sys_sendto (net/socket.c:729 net/socket.c:744 net/socket.c:2214) 
[ 81.688092][ C1] ? __pfx___sys_sendto (net/socket.c:2184) 
[ 81.688253][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 81.688428][ C1] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 81.688587][ C1] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 81.688747][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 81.688912][ C1] ? trace_rseq_update (./include/trace/events/rseq.h:11 (discriminator 52)) 
[ 81.689075][ C1] ? __rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 81.689272][ C1] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 81.689477][ C1] ? __pfx_task_work_run (kernel/task_work.c:196) 
[ 81.689637][ C1] __x64_sys_sendto (net/socket.c:2222) 
[ 81.689802][ C1] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 81.690022][ C1] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 81.690195][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   81.690396][    C1] RIP: 0033:0x7f51e7ff685a
[ 81.690560][ C1] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[   81.691135][    C1] RSP: 002b:00007fff4a54f0d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   81.691363][    C1] RAX: ffffffffffffffda RBX: 000000003a4d69d0 RCX: 00007f51e7ff685a
[   81.691582][    C1] RDX: 000000000000005c RSI: 000000003a4d65c0 RDI: 0000000000000005
[   81.691798][    C1] RBP: 000000003a4d69d0 R08: 00007fff4a54f0e0 R09: 0000000000000010
[   81.692013][    C1] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000005c


Finger prints:
__free_pages:neigh_hash_free_rcu:rcu_do_batch:rcu_core:handle_softirqs