INFO: task kworker/u8:3:49 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:3    state:D stack:23560 pid:49    tgid:49    ppid:2      task_flags:0x4208160 flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work