Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 2 UID: 0 PID: 8060 Comm: kworker/u32:12 Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:dst_dev_put+0x25/0x330 net/core/dst.c:149
Code: 90 90 90 90 90 f3 0f 1e fa 41 56 41 55 41 54 55 53 48 89 fb e8 7c 0d 90 f8 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 d6 02 00 00 48 8d 7b 3a 4c 8b 23 48 b8 00 00 00
RSP: 0018:ffffc90000858d58 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff899d6de7
RDX: 0000000000000004 RSI: ffffffff88fd7b74 RDI: 0000000000000020
RBP: 0000607e920a0dc8 R08: 0000000000000005 R09: 0000000000000007
R10: 0000000000000000 R11: 0000000000000000 R12: fffffbfff1b4c465
R13: dffffc0000000000 R14: 0000607e920a0dc8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88806a800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005644cabaa7d8 CR3: 000000002f4e8000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 0000000000000001 DR2: 0000000000000000
DR3: 0000000080000001 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rt_fibinfo_free_cpus.part.0+0xe7/0x1c0 net/ipv4/fib_semantics.c:206
 rt_fibinfo_free_cpus net/ipv4/fib_semantics.c:198 [inline]
 fib_nh_common_release+0x121/0x360 net/ipv4/fib_semantics.c:217
 fib6_info_destroy_rcu+0x199/0x1e0 net/ipv6/ip6_fib.c:177
 rcu_do_batch kernel/rcu/tree.c:2567 [inline]
 rcu_core+0x79d/0x14d0 kernel/rcu/tree.c:2823
 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554
 do_softirq kernel/softirq.c:455 [inline]
 do_softirq+0xb2/0xf0 kernel/softirq.c:442
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 addrconf_ifdown.isra.0+0x59d/0x1af0 net/ipv6/addrconf.c:3912
 addrconf_notify+0x220/0x19c0 net/ipv6/addrconf.c:3781
 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
 call_netdevice_notifiers net/core/dev.c:2048 [inline]
 dev_close_many+0x333/0x6a0 net/core/dev.c:1589
 unregister_netdevice_many_notify+0x489/0x1e50 net/core/dev.c:11373
 cleanup_net+0x58c/0xb40 net/core/net_namespace.c:621
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dst_dev_put+0x25/0x330 net/core/dst.c:149
Code: 90 90 90 90 90 f3 0f 1e fa 41 56 41 55 41 54 55 53 48 89 fb e8 7c 0d 90 f8 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 d6 02 00 00 48 8d 7b 3a 4c 8b 23 48 b8 00 00 00
RSP: 0018:ffffc90000858d58 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff899d6de7
RDX: 0000000000000004 RSI: ffffffff88fd7b74 RDI: 0000000000000020
RBP: 0000607e920a0dc8 R08: 0000000000000005 R09: 0000000000000007
R10: 0000000000000000 R11: 0000000000000000 R12: fffffbfff1b4c465
R13: dffffc0000000000 R14: 0000607e920a0dc8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88806a800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005644cabaa7d8 CR3: 000000002f4e8000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 0000000000000001 DR2: 0000000000000000
DR3: 0000000080000001 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	f3 0f 1e fa          	endbr64
   9:	41 56                	push   %r14
   b:	41 55                	push   %r13
   d:	41 54                	push   %r12
   f:	55                   	push   %rbp
  10:	53                   	push   %rbx
  11:	48 89 fb             	mov    %rdi,%rbx
  14:	e8 7c 0d 90 f8       	call   0xf8900d95
  19:	48 89 da             	mov    %rbx,%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 d6 02 00 00    	jne    0x30a
  34:	48 8d 7b 3a          	lea    0x3a(%rbx),%rdi
  38:	4c 8b 23             	mov    (%rbx),%r12
  3b:	48                   	rex.W
  3c:	b8                   	.byte 0xb8
  3d:	00 00                	add    %al,(%rax)