netdevsim netdevsim6 netdevsim3 (unregistering): unset [1, 1] type 2 family 0 port 20000 - 0
netdevsim netdevsim6 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim6 netdevsim2 (unregistering): unset [1, 1] type 2 family 0 port 20000 - 0
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: 3 UID: 0 PID: 20701 Comm: kworker/u32:10 Not tainted syzkaller #0 PREEMPT(full) 
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:mld_clear_delrec+0x2f0/0x6d0 net/ipv6/mcast.c:840
Code: 20 00 0f 85 b4 03 00 00 49 8b 5d 28 49 c7 45 28 00 00 00 00 48 85 db 75 37 e9 d4 00 00 00 e8 b7 49 71 f7 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 70 03 00 00 48 8b 2b 48 8d 7b 30 48 89 de e8
RSP: 0018:ffffc90003ebf398 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: 00000000ffff0000 RCX: ffffffff8a4a42b0
RDX: ffff8880307ac880 RSI: ffffffff8a4a4249 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88803bf31000 R14: ffff88805669f000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880d69b9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b875382f88 CR3: 000000000e380000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ipv6_mc_destroy_dev+0x49/0x690 net/ipv6/mcast.c:2839
 addrconf_ifdown.isra.0+0x1400/0x1aa0 net/ipv6/addrconf.c:3996
 addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3776
 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229
 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
 call_netdevice_notifiers net/core/dev.c:2281 [inline]
 unregister_netdevice_many_notify+0xf76/0x24c0 net/core/dev.c:12166
 unregister_netdevice_many net/core/dev.c:12229 [inline]
 unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:12073
 unregister_netdevice include/linux/netdevice.h:3385 [inline]
 nsim_destroy+0x198/0x800 drivers/net/netdevsim/netdev.c:1140
 __nsim_dev_port_del+0x189/0x240 drivers/net/netdevsim/dev.c:1473
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1485 [inline]
 nsim_dev_reload_destroy+0x10a/0x4d0 drivers/net/netdevsim/dev.c:1707
 nsim_dev_reload_down+0x6e/0xd0 drivers/net/netdevsim/dev.c:983
 devlink_reload+0x1a1/0x7c0 net/devlink/dev.c:461
 devlink_pernet_pre_exit+0x1a0/0x2b0 net/devlink/core.c:509
 ops_pre_exit_list net/core/net_namespace.c:160 [inline]
 ops_undo_list+0x184/0xab0 net/core/net_namespace.c:233
 cleanup_net+0x408/0x890 net/core/net_namespace.c:682
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 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:mld_clear_delrec+0x2f0/0x6d0 net/ipv6/mcast.c:840
Code: 20 00 0f 85 b4 03 00 00 49 8b 5d 28 49 c7 45 28 00 00 00 00 48 85 db 75 37 e9 d4 00 00 00 e8 b7 49 71 f7 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 70 03 00 00 48 8b 2b 48 8d 7b 30 48 89 de e8
RSP: 0018:ffffc90003ebf398 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: 00000000ffff0000 RCX: ffffffff8a4a42b0
RDX: ffff8880307ac880 RSI: ffffffff8a4a4249 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88803bf31000 R14: ffff88805669f000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880d69b9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b875382f88 CR3: 0000000032732000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	20 00                	and    %al,(%rax)
   2:	0f 85 b4 03 00 00    	jne    0x3bc
   8:	49 8b 5d 28          	mov    0x28(%r13),%rbx
   c:	49 c7 45 28 00 00 00 	movq   $0x0,0x28(%r13)
  13:	00
  14:	48 85 db             	test   %rbx,%rbx
  17:	75 37                	jne    0x50
  19:	e9 d4 00 00 00       	jmp    0xf2
  1e:	e8 b7 49 71 f7       	call   0xf77149da
  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 70 03 00 00    	jne    0x3a5
  35:	48 8b 2b             	mov    (%rbx),%rbp
  38:	48 8d 7b 30          	lea    0x30(%rbx),%rdi
  3c:	48 89 de             	mov    %rbx,%rsi
  3f:	e8                   	.byte 0xe8