Re: [question] solution for raid10 configuration concurrent with io

[Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>]

Hi,

Sorry that synchronize_rcu() is misplaced, it should be right after
rcu_read_unlock():

在 2023/04/27 15:13, Yu Kuai 写道:
> t1:                t2:
>
> raid10_write_request
>   rcu_read_lock
>   rdev = conf->mirros[].rdev
>                  raid10_remove_disk
>                   ......
>                   // nr_pending is 0, remove disk
>   // read inside rcu
>   rcu_read_unlock
					//set rdev NULL
					synchronize_rcu
>   raid10_write_one_disk
>   // trigger null-ptr-dereference

Thanks,
Kuai