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

[Marc MERLIN <marc_btrfs@merlins.org>]

On Wed, Apr 15, 2026 at 05:45:52PM -0700, Boris Burkov wrote:
> I am 99% sure this is a squotas bug now. I am able to reproduce friends
> of your issue like:

Great news, thanks or looking into it.

> I also think "btrfstune --remove-simple-quota" may fix your fs. It will
> have to do work in O(extents), and might fail in its fake mount, though.
 
moremagic:/tmp# btrfstune --remove-simple-quota /dev/mapper/crypt_bcache0
bad eb member end: ptr 0x4000 start 15495725432832 member offset 16384 size 1
bad eb member end: ptr 0x4000 start 16568941559808 member offset 16384 size 1
bad eb member end: ptr 0x4000 start 16133011357696 member offset 16384 size 1
bad eb member end: ptr 0x4000 start 15495760642048 member offset 16384 size 1
bad eb member end: ptr 0x4000 start 15641229164544 member offset 16384 size 1
bad eb member end: ptr 0x4000 start 16027775762432 member offset 16384 size 1
bad eb member end: ptr 0x4000 start 16217851576320 member offset 16384 size 1
bad eb member end: ptr 0x4000 start 16217853050880 member offset 16384 size 1
bad eb member end: ptr 0x4000 start 15505960157184 member offset 16384 size 1
(...) many lines

It's still running after a while and giving hundreds of those lines.

Willl report back when it's done.

> In terms of a check option, I think I can try to detect that we
> have a owner_ref item for a missing subvol and then nuke it. Working on
> that next.

thank you. But I can only check that if btrfs tune doesn't fix it. Did
you want me to stop the tune or let it run to completion?

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