netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 1] type 2 family 0 port 256 - 0
------------[ cut here ]------------
refcount_t: saturated; leaking memory.
WARNING: CPU: 3 PID: 15620 at lib/refcount.c:19 refcount_warn_saturate+0x10d/0x210 lib/refcount.c:19
Modules linked in:

CPU: 3 UID: 0 PID: 15620 Comm: syz-executor Not tainted 6.15.0-syzkaller-11802-g1af80d00e1e0 #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
RIP: 0010:refcount_warn_saturate+0x10d/0x210 lib/refcount.c:19
Code: 96 99 0b 31 ff 89 de e8 a1 cd e4 fc 84 db 75 a3 e8 b8 d2 e4 fc c6 05 6d 96 99 0b 01 90 48 c7 c7 60 de f4 8b e8 14 f1 a3 fc 90 <0f> 0b 90 90 eb 83 e8 98 d2 e4 fc 0f b6 1d 4a 96 99 0b 31 ff 89 de
RSP: 0018:ffffc900036d7208 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817a92c8
RDX: ffff888024160000 RSI: ffffffff817a92d5 RDI: 0000000000000001
RBP: ffff88804ae9426c R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804ae9426c
R13: ffff88804ae94100 R14: 1ffff920006dae48 R15: ffffc900036d7300
FS:  0000000000000000(0000) GS:ffff888097a72000(0063) knlGS:0000000057f88440
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7fa6e40 CR3: 000000004c6b0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_add_not_zero include/linux/refcount.h:187 [inline]
 __refcount_inc_not_zero include/linux/refcount.h:317 [inline]
 refcount_inc_not_zero include/linux/refcount.h:335 [inline]
 maybe_get_net include/net/net_namespace.h:279 [inline]
 nf_nat_masq_schedule.part.0+0x4ef/0x5f0 net/netfilter/nf_nat_masquerade.c:111
 nf_nat_masq_schedule net/netfilter/nf_nat_masquerade.c:108 [inline]
 masq_inet6_event+0x205/0x250 net/netfilter/nf_nat_masquerade.c:295
 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
 atomic_notifier_call_chain+0x71/0x1c0 kernel/notifier.c:223
 addrconf_ifdown.isra.0+0xe98/0x1a90 net/ipv6/addrconf.c:3982
 addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230