Re: 5.3.0 deadlock: btrfs_sync_file / btrfs_async_reclaim_metadata_space / btrfs_page_mkwrite

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On Sat, Oct 12, 2019 at 5:29 PM James Harvey <jamespharvey20@xxxxxxxxx> wrote:
>
> Was using a temporary BTRFS volume to compile mongodb, which is quite
> intensive and takes quite a bit of time.  The volume has been
> deadlocked for about 12 hours.
>
> Being a temporary volume, I just used mount without options, so it
> used the defaults:  rw,relatime,ssd,space_cache,subvolid=5,subvol=/
>
> Apologies if upgrading to 5.3.5+ will fix this.  I didn't see
> discussions of a deadlock looking like this.

I think it's a bug in any case, in particular because its all default
mount options, but it'd be interesting if any of the following make a
difference:

- space_cache=v2
- noatime



-- 
Chris Murphy



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