On Tue, Jun 20, 2017 at 08:44:29AM -0700, Marc MERLIN wrote: > On Tue, Jun 20, 2017 at 03:36:01PM +0000, Hugo Mills wrote: > > > Thanks for having a look. Is it a bug, or is it a problem with my storage > > > subsystem? > > > > Well, I'd say it's probably a problem with some inconsistent data > > on the disk. How that data got there is another matter -- it may be > > due to a bug which wrote the inconsistent data some time ago, and has > > only now been found out. > > Understood. > > > > "space cache will be invalidated " => doesn't that mean that my cache was > > > already cleared by check --repair, or are you saying I need to clear it > > > again? > > > > I'm never quite sure about that one. :) > > > > It can't hurt to clear it manually as well. > > Sounds good, done. Except it didn't help :( It worked for a while, and failed again.
It looks like I'm hitting a persistent bug :(
[ 86.383988] BTRFS: device label dshelf2 devid 1 transid 37975
/dev/mapper/dshelf2
[ 98.232529] BTRFS info (device dm-1): use lzo compression
[ 98.251982] BTRFS info (device dm-1): disk space caching is enabled
[ 98.274847] BTRFS info (device dm-1): has skinny extents
[ 104.171597] BTRFS info (device dm-1): detected SSD devices, enabling SSD mode
[ 165.429894] BTRFS error (device dm-1): Duplicate entries in free space
cache, dumping
[ 165.455673] BTRFS warning (device dm-1): failed to load free space cache for
block group 2039601954816, rebuilding it now
[ 234.221435] BTRFS warning (device dm-1): block group 2837392130048 has wrong
amount of free space
[ 234.249264] BTRFS warning (device dm-1): failed to load free space cache for
block group 2837392130048, rebuilding it now
[ 234.636396] BTRFS warning (device dm-1): block group 2885173641216 has wrong
amount of free space
[ 234.664015] BTRFS warning (device dm-1): failed to load free space cache for
block group 2885173641216, rebuilding it now
[ 242.042940] BTRFS warning (device dm-1): block group 3116565004288 has wrong
amount of free space
[ 242.071207] BTRFS warning (device dm-1): failed to load free space cache for
block group 3116565004288, rebuilding it now
[ 273.910918] BTRFS warning (device dm-1): block group 3209980542976 has wrong
amount of free space
[ 273.937625] BTRFS warning (device dm-1): failed to load free space cache for
block group 3209980542976, rebuilding it now
[ 298.578615] BTRFS warning (device dm-1): block group 2305889927168 has wrong
amount of free space
[ 298.605250] BTRFS warning (device dm-1): failed to load free space cache for
block group 2305889927168, rebuilding it now
[ 873.265687] BTRFS: Transaction aborted (error -17)
[ 873.948245] BTRFS: error (device dm-1) in btrfs_run_delayed_refs:2961:
errno=-17 Object already exists
[ 873.978884] BTRFS info (device dm-1): forced readonly
Given that check --repair ran clean when I ran it yesterday after this first
happened,
and I then ran mount -o clear_cache , the cache got rebuilt, and I got the
problem again,
this is not looking good, seems like a persistent bug :-/
I'm now going to remount this with nospace_cache to see if your guess about
space_cache was correct.
Other suggestions also welcome :)
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
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