[syzbot] [net?] INFO: task hung in addrconf_verify_work (10)

[syzbot <syzbot+95263979a9c3af871646@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    3857c2fe5449 Merge tag 'pci-v7.3-fixes-4' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1614c0a5580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4118aaa2d227be26
dashboard link: https://syzkaller.appspot.com/bug?extid=95263979a9c3af871646
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/891094e1d3d5/disk-3857c2fe.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ea13e7a03404/vmlinux-3857c2fe.xz
kernel image: https://storage.googleapis.com/syzbot-assets/853f16987787/bzImage-3857c2fe.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+95263979a9c3af871646@syzkaller.appspotmail.com

INFO: task kworker/R-ipv6_:3196 blocked for more than 158 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/R-ipv6_ state:D stack:29528 pid:3196  tgid:3196  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7376
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7433
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821
 rtnl_net_lock include/linux/rtnetlink.h:134 [inline]
 addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4770
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479


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