======================================
| [ 1592.747327][    C0] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)
| [ 1592.747779][    C0] ------------[ cut here ]------------
| [ 1592.748064][    C0] kernel BUG at include/linux/mm.h:1140!
| [ 1592.748391][    C0] Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[ 1592.749127][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1592.749658][ C0] RIP: 0010:__free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 1592.749903][ C0] Code: 0f 94 c3 e9 ba fe ff ff 48 c7 c6 a0 18 78 92 4c 89 e7 e8 df bf f4 ff 90 0f 0b 48 c7 c6 40 29 78 92 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 78 92 	mov    $0xffffffff927818a0,%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 78 92 	mov    $0xffffffff92782940,%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
[ 1592.750711][    C0] RSP: 0018:ffffc90000007e08 EFLAGS: 00010246
[ 1592.751000][    C0] RAX: 000000000000003e RBX: 0000000000000000 RCX: 1ffffffff267b43c
[ 1592.751346][    C0] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[ 1592.751679][    C0] RBP: ffffea00002dad34 R08: 0000000000000000 R09: fffffbfff267b43c
[ 1592.752016][    C0] R10: 0000000000000003 R11: 205d304320202020 R12: ffffea00002dad00
[ 1592.752368][    C0] R13: ffffc90000007ed0 R14: 0000000000000000 R15: 0000000000000000
[ 1592.752731][    C0] FS:  00007fe29f530740(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[ 1592.753148][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1592.753448][    C0] CR2: 00007fff29cf6000 CR3: 0000000005fc2003 CR4: 0000000000772ef0
[ 1592.753808][    C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1592.754169][    C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1592.754526][    C0] PKRU: 55555554
[ 1592.754707][    C0] Call Trace:
[ 1592.754889][    C0]  <IRQ>
[ 1592.755012][ C0] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 1592.755200][ C0] ? do_trap (arch/x86/kernel/traps.c:156 arch/x86/kernel/traps.c:197) 
[ 1592.755381][ C0] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 1592.755622][ C0] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:218) 
[ 1592.755859][ C0] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 1592.756097][ C0] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 1592.756321][ C0] ? handle_invalid_op (arch/x86/kernel/traps.c:256) 
[ 1592.756551][ C0] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 1592.756779][ C0] ? exc_invalid_op (arch/x86/kernel/traps.c:315) 
[ 1592.757008][ C0] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 1592.757241][ C0] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 1592.757468][ C0] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) 
[ 1592.757693][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2567) 
[ 1592.757920][ C0] neigh_hash_free_rcu (net/core/neighbour.c:554) 
[ 1592.758162][ C0] rcu_do_batch (kernel/rcu/tree.c:2567) 
[ 1592.758388][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 1592.758620][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2491) 
[ 1592.758855][ C0] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4339 kernel/locking/lockdep.c:4406) 
[ 1592.759157][ C0] rcu_core (kernel/rcu/tree.c:2825) 
[ 1592.759338][ C0] handle_softirqs (kernel/softirq.c:554) 
[ 1592.759580][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:917 net/core/dev.c:4457) 
[ 1592.759817][ C0] do_softirq (kernel/softirq.c:455 kernel/softirq.c:442) 
[ 1592.759998][    C0]  </IRQ>
[ 1592.760122][    C0]  <TASK>
[ 1592.760243][ C0] __local_bh_enable_ip (kernel/softirq.c:382) 
[ 1592.760484][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:917 net/core/dev.c:4457) 
[ 1592.760719][ C0] __dev_queue_xmit (net/core/dev.c:4458) 
[ 1592.760959][ C0] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 1592.761204][ C0] ? ip6_finish_output2 (./include/net/neighbour.h:537 net/ipv6/ip6_output.c:141) 
[ 1592.761440][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 1592.761677][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 1592.761914][ C0] ? __pfx___dev_queue_xmit (net/core/dev.c:4339) 
[ 1592.762152][ C0] ? eth_header (net/ethernet/eth.c:100) 
[ 1592.762401][ C0] ? neigh_resolve_output (./include/linux/netdevice.h:3216 net/core/neighbour.c:1524 net/core/neighbour.c:1509) 
[ 1592.762644][ C0] ip6_finish_output2 (./include/net/neighbour.h:537 net/ipv6/ip6_output.c:141) 
[ 1592.762888][ C0] ip6_finish_output (net/ipv6/ip6_output.c:215 net/ipv6/ip6_output.c:226) 
[ 1592.763111][ 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) 
[ 1592.763337][ C0] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:247) 
[ 1592.763518][ C0] ? __pfx_ip6_output (net/ipv6/ip6_output.c:234) 
[ 1592.763748][ C0] NF_HOOK.constprop.0 (./include/linux/rcupdate.h:337 ./include/linux/rcupdate.h:849 ./include/linux/netfilter.h:238 ./include/linux/netfilter.h:312) 
[ 1592.763978][ C0] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 1592.764205][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 1592.764427][ C0] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 1592.764654][ C0] ? rawv6_send_hdrinc (./include/linux/rcupdate.h:337 ./include/linux/rcupdate.h:849 net/ipv6/raw.c:659) 
[ 1592.764880][ C0] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 1592.765101][ C0] ? rawv6_send_hdrinc (./include/linux/rcupdate.h:337 ./include/linux/rcupdate.h:849 net/ipv6/raw.c:659) 
[ 1592.765326][ C0] rawv6_send_hdrinc (net/ipv6/raw.c:663 (discriminator 60)) 
[ 1592.765556][ C0] ? __pfx_rawv6_send_hdrinc (net/ipv6/raw.c:596) 
[ 1592.765795][ C0] ? ip6_dst_hoplimit.part.0.isra.0 (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/ipv6/output_core.c:117) 
[ 1592.766097][ C0] rawv6_sendmsg (net/ipv6/raw.c:914) 
[ 1592.766337][ C0] ? __pfx_rawv6_sendmsg (net/ipv6/raw.c:741) 
[ 1592.766575][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 1592.766817][ C0] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 1592.767058][ C0] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 1592.767296][ C0] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 1592.767539][ C0] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 1592.767773][ C0] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 1592.768018][ C0] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 1592.768257][ C0] ? __sys_sendto (net/socket.c:729 net/socket.c:744 net/socket.c:2214) 
[ 1592.768496][ C0] __sys_sendto (net/socket.c:729 net/socket.c:744 net/socket.c:2214) 
[ 1592.768733][ C0] ? __pfx___sys_sendto (net/socket.c:2184) 
[ 1592.768969][ C0] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 1592.769204][ C0] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 1592.769442][ C0] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 1592.769682][ C0] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 1592.769907][ C0] ? trace_rseq_update (./include/trace/events/rseq.h:11 (discriminator 52)) 
[ 1592.770143][ C0] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 1592.770425][ C0] ? __pfx_task_work_run (kernel/task_work.c:196) 
[ 1592.770655][ C0] __x64_sys_sendto (net/socket.c:2222) 
[ 1592.770881][ C0] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 1592.771165][ C0] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 1592.771394][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1592.771674][    C0] RIP: 0033:0x7fe29f78a85a
[ 1592.771910][ C0] 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
[ 1592.772734][    C0] RSP: 002b:00007fff29cfdbc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[ 1592.773099][    C0] RAX: ffffffffffffffda RBX: 000000000f796ec0 RCX: 00007fe29f78a85a
[ 1592.773457][    C0] RDX: 0000000000000070 RSI: 000000000f797160 RDI: 0000000000000005
[ 1592.773817][    C0] RBP: 000000000f796ec0 R08: 00007fff29cfdbd0 R09: 000000000000001c
[ 1592.774183][    C0] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000070


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