> Gesendet: Montag, 29. März 2021 um 01:02 Uhr
> Von: "Chris Murphy" <li...@colorremedies.com>
> An: "B A" <chris....@web.de>
> Cc: "Btrfs BTRFS" <linux-btrfs@vger.kernel.org>
> Betreff: Re: Help needed with filesystem errors: parent transid verify failed
>
> On Sun, Mar 28, 2021 at 9:41 AM B A <chris....@web.de> wrote:
> >
> > Dear btrfs experts,
> >
> >
> > On my desktop PC, I have 1 btrfs partition on a single SSD device with 3 
> > subvolumes (/, /home, /var). Whenever I boot my PC, after logging in to 
> > GNOME, the btrfs partition is being remounted as ro due to errors. This is 
> > the dmesg output at that time:
> >
> > > [ 616.155392] BTRFS error (device dm-0): parent transid verify failed on 
> > > 1144783093760 wanted 2734307 found 2734305
> > > [ 616.155650] BTRFS error (device dm-0): parent transid verify failed on 
> > > 1144783093760 wanted 2734307 found 2734305
> > > [ 616.155657] BTRFS: error (device dm-0) in __btrfs_free_extent:3054: 
> > > errno=-5 IO failure
> > > [ 616.155662] BTRFS info (device dm-0): forced readonly
> > > [ 616.155665] BTRFS: error (device dm-0) in btrfs_run_delayed_refs:2124: 
> > > errno=-5 IO failure
>
> transid error usually means something below Btrfs got the write
> ordering wrong and one or more writes dropped, but the problem isn't
> detected until later which means it's an older problem. What's the
> oldest kernel this file system has been written with? That is, is it a
> new Fedora 33 file system? Or older? Fedora 33 came with 5.8.15.

This is a very old BTRFS filesystem created with Fedora *23* i.e. a linux 
kernel and btrfs-progs around version 4.2. It was probably created 2015-10-31 
with Fedora 23 beta and kernel 4.2.4 or 4.2.5.

I ran `btrfs scrub` about a month ago without issues. I ran `btrfs check` maybe 
a year ago without issues. I also run `btrfs filesystem balance` from time to 
time (~once a year). None of these have shown the issue before. Does that mean 
that the issue has not been present for a long time (>1 year)?

> ERROR: child eb corrupted: parent bytenr=1144783093760 item=14 parent
> level=1 child level=2
> ERROR: child eb corrupted: parent bytenr=1144881201152 item=14 parent
> level=1 child level=2
>
> Can you post the output from both:
>
> btrfs insp dump-t -b 1144783093760 /dev/dm-0

See attached file "btrfs_insp_dump-t_-b_x60.txt"

> btrfs insp dump-t -b 1144881201152 /dev/dm-0

See attached file "btrfs_insp_dump-t_-b_x52.txt"

> > What shall I do now? Do I need any of the invasive methods (`btrfs rescue` 
> > or `btrfs check --repair`) and if yes, which method do I choose?
>
> No repairs yet until we know what's wrong and if it's safe to try to repair 
> it.
>
> In the meantime I highly recommend refreshing backups of /home in case
> this can't be repaired. It might be easier to do this with a Live USB
> boot of Fedora 33, and use 'mount -o ro,subvol=home /dev/dm-0
> /mnt/home' to mount your home read-only to get a backup. Live
> environment will be more cooperative.
> --
> Chris Murphy

Thanks for your help so far!

Kind regards,
Chris
btrfs-progs v5.10
node 1144881201152 level 1 items 326 free space 167 generation 2734383 owner 
EXTENT_TREE
node 1144881201152 flags 0x1(WRITTEN) backref revision 1
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btrfs-progs v5.10
node 1144783093760 level 2 items 70 free space 423 generation 2734305 owner 
CSUM_TREE
node 1144783093760 flags 0x1(WRITTEN) backref revision 1
fs uuid 1a149bda-057d-4775-ba66-1bf259fce9a5
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