INFO: task kworker/R-ipv6_:3152 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/R-ipv6_ state:D stack:29160 pid:3152  ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work