syzbot

batman_adv: batadv0: Removing interface: batadv_slave_0
batman_adv: batadv0: Removing interface: batadv_slave_1
Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007]
CPU: 0 UID: 0 PID: 2951 Comm: kworker/u8:7 Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
RIP: 0010:ip6_mc_clear_src+0x89/0x5a0 net/ipv6/mcast.c:2599
Code: 49 bc 00 00 00 00 00 fc ff df 48 8d 45 10 49 89 c5 48 89 04 24 49 c1 ed 03 4d 01 e5 eb 32 e8 de 54 7f f7 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 80 04 00 00 4c 8b 3b 48 8d 7b 30 48 89 de e8
RSP: 0018:ffffc9000b86f528 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: 00000000ffff0000 RCX: ffffffff8a3c944b
RDX: ffff888031182440 RSI: ffffffff8a3c93d2 RDI: 0000000000000005
RBP: ffff888055416000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: ffffed100aa82c02 R14: ffff888055416028 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124720000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fcf8ff8 CR3: 000000005c540000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 mld_clear_delrec+0xfb/0x640 net/ipv6/mcast.c:826
 ipv6_mc_destroy_dev+0x49/0x690 net/ipv6/mcast.c:2842
 addrconf_ifdown.isra.0+0x13ef/0x1a90 net/ipv6/addrconf.c:3995
 addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3775
 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
 call_netdevice_notifiers net/core/dev.c:2282 [inline]
 unregister_netdevice_many_notify+0xf9d/0x2700 net/core/dev.c:12077
 unregister_netdevice_many net/core/dev.c:12140 [inline]
 default_device_exit_batch+0x853/0xaf0 net/core/dev.c:12644
 ops_exit_list net/core/net_namespace.c:206 [inline]
 ops_undo_list+0x360/0xab0 net/core/net_namespace.c:253
 cleanup_net+0x408/0x890 net/core/net_namespace.c:686
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ip6_mc_clear_src+0x89/0x5a0 net/ipv6/mcast.c:2599
Code: 49 bc 00 00 00 00 00 fc ff df 48 8d 45 10 49 89 c5 48 89 04 24 49 c1 ed 03 4d 01 e5 eb 32 e8 de 54 7f f7 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 80 04 00 00 4c 8b 3b 48 8d 7b 30 48 89 de e8
RSP: 0018:ffffc9000b86f528 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: 00000000ffff0000 RCX: ffffffff8a3c944b
RDX: ffff888031182440 RSI: ffffffff8a3c93d2 RDI: 0000000000000005
RBP: ffff888055416000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: ffffed100aa82c02 R14: ffff888055416028 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124820000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000118 CR3: 000000002a3f6000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
   7:	fc ff df
   a:	48 8d 45 10          	lea    0x10(%rbp),%rax
   e:	49 89 c5             	mov    %rax,%r13
  11:	48 89 04 24          	mov    %rax,(%rsp)
  15:	49 c1 ed 03          	shr    $0x3,%r13
  19:	4d 01 e5             	add    %r12,%r13
  1c:	eb 32                	jmp    0x50
  1e:	e8 de 54 7f f7       	call   0xf77f5501
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	0f 85 80 04 00 00    	jne    0x4b5
  35:	4c 8b 3b             	mov    (%rbx),%r15
  38:	48 8d 7b 30          	lea    0x30(%rbx),%rdi
  3c:	48 89 de             	mov    %rbx,%rsi
  3f:	e8                   	.byte 0xe8