Re: Simple quota unsafe? RIP: 0010:__btrfs_free_extent.isra.0+0xc41/0x1020 [btrfs] / do_free_extent_accounting:2999: errno=-2 No such entry

[Boris Burkov <boris@bur.io>]

On Fri, Apr 17, 2026 at 03:37:54PM -0700, Marc MERLIN wrote:
> On Fri, Apr 17, 2026 at 02:51:27PM -0700, Boris Burkov wrote:
> > Just to be extra clear as it is relevant for fully understanding the
> > repro-space, are you managing these purely with receive / subvol delete
> > commands? 
> 
> yes
> 
> > Did you ever delete a qgroup that was straggling around or add
> > automation to do that (btrfs qgroup destroy <qgid>) or did you ever
> > disable/enable squotas besides the first time?
> 
> no to all 3
> 

Rad, so there is some more "exciting" bug with balance lurking there.

> > Were all the squota enables on existing fs-es?
> 
> Yes. My understanding was that I have to create the FS first and then
> turn on squota. If I could turn it on as an option to mkfs.btffs, I
> would but I didn't find such an option.
> 

mkfs.btrfs -O squota <dev>

should make a fresh btrfs with squota enabled. But we can worry about
that once I get the fixes in. :)

> Marc
> -- 
> "A mouse is a device used to point at the xterm you want to type in" - A.S.R.
>  
> Home page: http://marc.merlins.org/                       | PGP 7F55D5F27AAF9D08