general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 PID: 81 Comm: kworker/u4:3 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:__hlist_del include/linux/list.h:840 [inline]
RIP: 0010:hlist_del_init_rcu include/linux/rculist.h:184 [inline]
RIP: 0010:napi_hash_del net/core/dev.c:6147 [inline]
RIP: 0010:__netif_napi_del.part.0+0x9f/0x520 net/core/dev.c:6329
Code: 48 c1 ea 03 80 3c 02 00 0f 85 f6 03 00 00 48 8b 04 24 48 89 da 48 c1 ea 03 48 8b a8 70 01 00 00 48 b8 00 00 00 00 00 fc ff df <80> 3c 02 00 0f 85 08 04 00 00 48 85 ed 48 89 2b 74 28 e8 9a 1c 4e
RSP: 0018:ffffc90001aaf988 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000046 RCX: 0000000000000000
RDX: 0000000000000008 RSI: ffffffff87297c71 RDI: ffffe8ffffcd3210
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52000355f23 R11: 0000000000000000 R12: ffffe8ffffcd30a0
R13: 0000000000000000 R14: ffffe8ffffcd30a0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ef1e88d9e0 CR3: 000000004287a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __netif_napi_del+0x3c/0x50 net/core/dev.c:6326
 gro_cells_destroy net/core/gro_cells.c:102 [inline]
 gro_cells_destroy+0x115/0x360 net/core/gro_cells.c:92
 ip6gre_dev_free+0x15/0x60 net/ipv6/ip6_gre.c:1412
 netdev_run_todo+0x6b4/0xa80 net/core/dev.c:9946
 ip6gre_exit_batch_net+0x4ac/0x760 net/ipv6/ip6_gre.c:1630
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 125c4dc8ea2708fa ]---
RIP: 0010:__hlist_del include/linux/list.h:840 [inline]
RIP: 0010:hlist_del_init_rcu include/linux/rculist.h:184 [inline]
RIP: 0010:napi_hash_del net/core/dev.c:6147 [inline]
RIP: 0010:__netif_napi_del.part.0+0x9f/0x520 net/core/dev.c:6329
Code: 48 c1 ea 03 80 3c 02 00 0f 85 f6 03 00 00 48 8b 04 24 48 89 da 48 c1 ea 03 48 8b a8 70 01 00 00 48 b8 00 00 00 00 00 fc ff df <80> 3c 02 00 0f 85 08 04 00 00 48 85 ed 48 89 2b 74 28 e8 9a 1c 4e
RSP: 0018:ffffc90001aaf988 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000046 RCX: 0000000000000000
RDX: 0000000000000008 RSI: ffffffff87297c71 RDI: ffffe8ffffcd3210
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52000355f23 R11: 0000000000000000 R12: ffffe8ffffcd30a0
R13: 0000000000000000 R14: ffffe8ffffcd30a0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ef1e88d9e0 CR3: 000000004287a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 f6 03 00 00    	jne    0x404
   e:	48 8b 04 24          	mov    (%rsp),%rax
  12:	48 89 da             	mov    %rbx,%rdx
  15:	48 c1 ea 03          	shr    $0x3,%rdx
  19:	48 8b a8 70 01 00 00 	mov    0x170(%rax),%rbp
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 08 04 00 00    	jne    0x43c
  34:	48 85 ed             	test   %rbp,%rbp
  37:	48 89 2b             	mov    %rbp,(%rbx)
  3a:	74 28                	je     0x64
  3c:	e8                   	.byte 0xe8
  3d:	9a                   	(bad)
  3e:	1c 4e                	sbb    $0x4e,%al