Oops: general protection fault, probably for non-canonical address 0xdffffc000000000f: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000078-0x000000000000007f]
CPU: 2 PID: 1090 Comm: kworker/u32:6 Not tainted 6.10.0-rc5-syzkaller-00018-g55027e689933 #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 8c c0 cf 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:ffffc90000540d28 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 000000000000007d RCX: ffffffff895bc2cb
RDX: 000000000000000f RSI: ffffffff88becdd4 RDI: 000000000000007d
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000007
R10: 0000000000000001 R11: 0000000000000005 R12: fffffbfff1a92a7d
R13: 0000607f81047058 R14: 0000607f81047058 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802c200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000030d08ff8 CR3: 00000000275da000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rt_fibinfo_free_cpus.part.0+0xe5/0x1d0 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
 fib_nh_release net/ipv4/fib_semantics.c:229 [inline]
 free_fib_info_rcu+0x1a1/0x510 net/ipv4/fib_semantics.c:241
 rcu_do_batch kernel/rcu/tree.c:2535 [inline]
 rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2809
 handle_softirqs+0x216/0x8f0 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
 pneigh_ifdown_and_unlock net/core/neighbour.c:867 [inline]
 __neigh_ifdown.isra.0+0x15e/0x400 net/core/neighbour.c:447
 neigh_ifdown+0x1e/0x30 net/core/neighbour.c:464
 rt6_disable_ip+0x29a/0xa00 net/ipv6/route.c:4917
 addrconf_ifdown.isra.0+0x117/0x1a70 net/ipv6/addrconf.c:3855
 addrconf_notify+0x223/0x19e0 net/ipv6/addrconf.c:3778
 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1992
 call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]
 call_netdevice_notifiers net/core/dev.c:2044 [inline]
 dev_close_many+0x333/0x6a0 net/core/dev.c:1585
 unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11194
 unregister_netdevice_many net/core/dev.c:11277 [inline]
 default_device_exit_batch+0x731/0x9b0 net/core/dev.c:11760
 ops_exit_list+0x128/0x180 net/core/net_namespace.c:178
 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640
 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 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 8c c0 cf 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:ffffc90000540d28 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 000000000000007d RCX: ffffffff895bc2cb
RDX: 000000000000000f RSI: ffffffff88becdd4 RDI: 000000000000007d
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000007
R10: 0000000000000001 R11: 0000000000000005 R12: fffffbfff1a92a7d
R13: 0000607f81047058 R14: 0000607f81047058 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802c200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000030d08ff8 CR3: 00000000275da000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 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 8c c0 cf f8       	call   0xf8cfc0a5
  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)