INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 PID: 8729 Comm: kworker/u4:24 Not tainted 6.2.0-rc6-next-20230202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 assign_lock_key kernel/locking/lockdep.c:982 [inline]
 register_lock_class+0xdb6/0x1120 kernel/locking/lockdep.c:1295
 __lock_acquire+0x10a/0x5df0 kernel/locking/lockdep.c:4951
 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5691
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:350 [inline]
 proc_entry_rundown+0xeb/0x1d0 fs/proc/inode.c:271
 remove_proc_entry+0x1b3/0x460 fs/proc/generic.c:716
 ip6mr_net_exit+0x43/0xf0 net/ipv6/ip6mr.c:1350
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
 process_one_work+0x9bf/0x1820 kernel/workqueue.c:2390
 worker_thread+0x669/0x1090 kernel/workqueue.c:2537
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 8729 Comm: kworker/u4:24 Not tainted 6.2.0-rc6-next-20230202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: netns cleanup_net
RIP: 0010:close_pdeo+0x79/0x170 fs/proc/inode.c:234
Code: c7 40 10 f3 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 84 24 b8 00 00 00 31 c0 e8 c2 c7 7e ff 48 8d 7d 18 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 74 06 0f 8e c6 00 00 00 44 0f b6 6d 18 31 ff
RSP: 0018:ffffc90015e47980 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 1ffff92002bc8f30 RCX: 0000000000000000
RDX: ffff8880274f9d40 RSI: ffffffff8206030e RDI: 0000000000000018
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52002bc8f3f R11: 3e4b5341542f3c20 R12: ffff88802b6863c0
R13: dffffc0000000000 R14: 1ffff92002bc8f4d R15: fffffbfff1c52e4c
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020404030 CR3: 000000000c571000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 proc_entry_rundown+0x134/0x1d0 fs/proc/inode.c:275
 remove_proc_entry+0x1b3/0x460 fs/proc/generic.c:716
 ip6mr_net_exit+0x43/0xf0 net/ipv6/ip6mr.c:1350
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
 process_one_work+0x9bf/0x1820 kernel/workqueue.c:2390
 worker_thread+0x669/0x1090 kernel/workqueue.c:2537
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:close_pdeo+0x79/0x170 fs/proc/inode.c:234
Code: c7 40 10 f3 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 84 24 b8 00 00 00 31 c0 e8 c2 c7 7e ff 48 8d 7d 18 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 74 06 0f 8e c6 00 00 00 44 0f b6 6d 18 31 ff
RSP: 0018:ffffc90015e47980 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 1ffff92002bc8f30 RCX: 0000000000000000
RDX: ffff8880274f9d40 RSI: ffffffff8206030e RDI: 0000000000000018
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52002bc8f3f R11: 3e4b5341542f3c20 R12: ffff88802b6863c0
R13: dffffc0000000000 R14: 1ffff92002bc8f4d R15: fffffbfff1c52e4c
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020404030 CR3: 000000000c571000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c7 40 10 f3 f3 f3 f3 	movl   $0xf3f3f3f3,0x10(%rax)
   7:	65 48 8b 04 25 28 00 	mov    %gs:0x28,%rax
   e:	00 00
  10:	48 89 84 24 b8 00 00 	mov    %rax,0xb8(%rsp)
  17:	00
  18:	31 c0                	xor    %eax,%eax
  1a:	e8 c2 c7 7e ff       	callq  0xff7ec7e1
  1f:	48 8d 7d 18          	lea    0x18(%rbp),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	74 06                	je     0x39
  33:	0f 8e c6 00 00 00    	jle    0xff
  39:	44 0f b6 6d 18       	movzbl 0x18(%rbp),%r13d
  3e:	31 ff                	xor    %edi,%edi