Re: [PATCH 0/4][v2] Lockdep fixes

[David Sterba <dsterba@suse.cz>]

On Tue, Sep 01, 2020 at 05:40:34PM -0400, Josef Bacik wrote:
> v1->v2:
> - Included the add_missing_dev patch in the series.
> - Added a patch to kill the rcu protection for fs_info->space_info.
> - Fixed the raid sysfs init stuff to be completely out of link_block_group, as
>   it causes a lockdep splat with the rwsem conversion.
> 
> Hello,
> 
> These are the last two lockdep splats I'm able to see in my testing.  We have
> like 4 variations of the same lockdep splat that's addressed by 
> 
> btrfs: do not create raid sysfs entries under chunk_mutex
> 
> Basically this particular dependency pulls in the kernfs_mutex under the
> chunk_mutex, and so we have like 4 issues in github with slightly different
> splats, but are all fixed by that fix.  With these two patches (and the one I
> sent the other day for add_missing_dev) I haven't hit any lockdep splats in 6
> runs of xfstests on 3 different VMs in the last 12 hours.  That means it should
> take Dave at least 2 runs before he hits a new one.  Thanks,
> 
> Josef Bacik (4):
>   btrfs: fix lockdep splat in add_missing_dev
>   btrfs: init sysfs for devices outside of the chunk_mutex

So the two patches were in misc-next and I started to see lockdep
complaining in btrfs/011, which is very early in the test list and this
makes it impossible to notice further lockdep reports.

I'll move the patches to a topic branch and will retest misc-next to see
what's the actual list of lockdep things to fix, so we have a clean
state before the eb rwsem switch.