Re: [4.7.2] btrfs_run_delayed_refs:2963: errno=-17 Object already exists

[Marc Joliet <marcec@gmx.de>]

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On Mittwoch, 1. März 2017 19:14:07 CET you wrote:
>  In any
> case, I started btrfs-check on the device itself.

*Sigh*, I had to restart it, because I forgot to redirect to a file and quite 
frankly wasn't expecting this flood of output, but here's a summary of the 
output after about 2 days:

% wc -l btrfs_check_output_20170303.log 
1360252 btrfs_check_output_20170303.log
% grep -v "backref lost" btrfs_check_output_20170303.log | grep -v "check \
(leaf\|node\) failed" | grep -v "lost its parent" | grep -v "referencer count" 
checking extents
ERROR: block group[3879328546816 1073741824] used 1072840704 but extent items 
used 1129164800
ERROR: block group[4163870130176 1073741824] used 1072259072 but extent items 
used 0
ERROR: block group[4223999672320 1073741824] used 1073664000 but extent items 
used 1074188288
ERROR: block group[4278760505344 1073741824] used 1073377280 but extent items 
used 1073901568
ERROR: block group[4406535782400 1073741824] used 1073627136 but extent items 
used 0
ERROR: extent [3830028140544 4096] referencer bytenr mismatch, wanted: 
3830028140544, have: 3826183847936
% tail btrfs_check_output_20170303.log 
ERROR: data extent[3924538445824 4096] backref lost
ERROR: data extent[3933464903680 4096] backref lost
ERROR: data extent[3924538531840 4096] backref lost
ERROR: data extent[3839131480064 4096] backref lost
ERROR: data extent[3834701750272 4096] backref lost
ERROR: data extent[3873087918080 4096] backref lost
ERROR: data extent[3873072283648 4096] backref lost
ERROR: data extent[3873088090112 8192] backref lost
ERROR: data extent[3873072287744 4096] backref lost
ERROR: data extent[3856294449152 4096] backref lost

That's right, slowly approaching 1.5 million lines of btrfs-check output!  
That's *way* more than I ran it the last time this error happened a few weeks 
ago.

Greetings
-- 
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup

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