netdevsim netdevsim1 eth0 (unregistering): unset [1, 0] type 2 family 0 port 256 - 0
netdevsim netdevsim1 eth0 (unregistering): unset [1, 1] type 2 family 0 port 6081 - 0
netdevsim netdevsim4 eth3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007]
CPU: 1 UID: 0 PID: 6030 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:mld_clear_delrec+0x3a5/0x660 net/ipv6/mcast.c:840
Code: ff ff ff e8 ed 2b 41 01 89 c5 31 ff 89 c6 e8 62 00 87 f7 85 ed 74 40 e8 19 fc 86 f7 eb 05 e8 12 fc 86 f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 cc 67 ea f7 4d 8b 27 49 8d 7f 30
RSP: 0018:ffffc900048d70d0 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: ffff8880589c8538 RCX: ffff888030589e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8fa38637 R09: 1ffffffff1f470c6
R10: dffffc0000000000 R11: fffffbfff1f470c7 R12: ffff888048432428
R13: dffffc0000000000 R14: ffff888048432400 R15: 00000000ffff0000
FS:  0000000000000000(0000) GS:ffff888125d18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff84fcd1140 CR3: 0000000057d6a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ipv6_mc_destroy_dev+0x45/0x5a0 net/ipv6/mcast.c:2839
 addrconf_ifdown+0x139e/0x1880 net/ipv6/addrconf.c:3996
 addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
 call_netdevice_notifiers net/core/dev.c:2281 [inline]
 unregister_netdevice_many_notify+0x14d7/0x1ff0 net/core/dev.c:12166
 unregister_netdevice_many net/core/dev.c:12229 [inline]
 unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12073
 unregister_netdevice include/linux/netdevice.h:3385 [inline]
 nsim_destroy+0x1dd/0x670 drivers/net/netdevsim/netdev.c:1140
 __nsim_dev_port_del+0x14d/0x1b0 drivers/net/netdevsim/dev.c:1473
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1485 [inline]
 nsim_dev_reload_destroy+0x288/0x490 drivers/net/netdevsim/dev.c:1707
 nsim_dev_reload_down+0x8a/0xc0 drivers/net/netdevsim/dev.c:983
 devlink_reload+0x1b3/0x8d0 net/devlink/dev.c:461
 devlink_pernet_pre_exit+0x1d9/0x3d0 net/devlink/core.c:509
 ops_pre_exit_list net/core/net_namespace.c:160 [inline]
 ops_undo_list+0x187/0x990 net/core/net_namespace.c:233
 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:682
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 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+0x3a5/0x660 net/ipv6/mcast.c:840
Code: ff ff ff e8 ed 2b 41 01 89 c5 31 ff 89 c6 e8 62 00 87 f7 85 ed 74 40 e8 19 fc 86 f7 eb 05 e8 12 fc 86 f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 cc 67 ea f7 4d 8b 27 49 8d 7f 30
RSP: 0018:ffffc900048d70d0 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: ffff8880589c8538 RCX: ffff888030589e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8fa38637 R09: 1ffffffff1f470c6
R10: dffffc0000000000 R11: fffffbfff1f470c7 R12: ffff888048432428
R13: dffffc0000000000 R14: ffff888048432400 R15: 00000000ffff0000
FS:  0000000000000000(0000) GS:ffff888125d18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff84fcd1140 CR3: 0000000057d6a000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	e8 ed 2b 41 01       	call   0x1412bf2
   5:	89 c5                	mov    %eax,%ebp
   7:	31 ff                	xor    %edi,%edi
   9:	89 c6                	mov    %eax,%esi
   b:	e8 62 00 87 f7       	call   0xf7870072
  10:	85 ed                	test   %ebp,%ebp
  12:	74 40                	je     0x54
  14:	e8 19 fc 86 f7       	call   0xf786fc32
  19:	eb 05                	jmp    0x20
  1b:	e8 12 fc 86 f7       	call   0xf786fc32
  20:	4c 89 f8             	mov    %r15,%rax
  23:	48 c1 e8 03          	shr    $0x3,%rax
* 27:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2c:	74 08                	je     0x36
  2e:	4c 89 ff             	mov    %r15,%rdi
  31:	e8 cc 67 ea f7       	call   0xf7ea6802
  36:	4d 8b 27             	mov    (%r15),%r12
  39:	49 8d 7f 30          	lea    0x30(%r15),%rdi