linux-kernel - Re: [GIT PULL] bcachefs

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Date:   Wed, 28 Jun 2023 13:56:08 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-bcachefs@...r.kernel.org,
        Christoph Hellwig <hch@....de>
Subject: Re: [GIT PULL] bcachefs

On Wed, Jun 28, 2023 at 09:22:15AM -0600, Jens Axboe wrote:
> On 6/28/23 8:58?AM, Jens Axboe wrote:
> > I should have something later today, don't feel like I fully understand
> > all of it just yet.
> 
> Might indeed be delayed_fput, just the flush is a bit broken in that it
> races with the worker doing the flush. In any case, with testing that, I
> hit this before I got an umount failure on loop 6 of generic/388:
> 
> fsck from util-linux 2.38.1
> recovering from clean shutdown, journal seq 14642
> journal read done, replaying entries 14642-14642
> checking allocations
> starting journal replay, 0 keys
> checking need_discard and freespace btrees
> checking lrus
> checking backpointers to alloc keys
> checking backpointers to extents
> backpointer for missing extent
>   u64s 9 type backpointer 0:7950303232:0 len 0 ver 0: bucket=0:15164:0 btree=extents l=0 offset=0:0 len=88 pos=1342182431:5745:U32_MAX, not fixing

Known bug, but it's gotten difficult to reproduce - if generic/388 ends
up being a better reproducer for this that'll be nice