INFO: task kworker/u4:0:11 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:0    state:D stack:23656 pid:11    ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_verify_work