(Resend with the log compressed this time.) On Friday 17 February 2017 09:19:15 Kai Krakow wrote: > Am Tue, 14 Feb 2017 13:52:48 +0100 > > schrieb Marc Joliet <marcec@xxxxxx>: > > Hi again, > > > > so, it seems that I've solved the problem: After having to > > umount/mount the FS several times to get btrfs-cleaner to finish, I > > thought of the "failed to load free space [...], rebuilding it now" > > type errors and decided to try the clear_cache mount option. Since > > then, my home server has been running its backups regularly again. > > Furthermore, I was able back up my desktop again via send/recv (the > > rsync based backup is still running, but I expect it to succeed). > > The kernel log has also stayed clean. *sigh* It was working fine... until the 26th (so almost 2 weeks without incident). Now the error keeps occurring, and the clear_cache mount option stopped helping. Just out of curiosity, I used "clear_cache,space_cache=v2", which also didn't help. I've attached the full log, in case it's in any way useful. This is all with: % uname -a Linux diefledermaus 4.9.12-gentoo #1 SMP Fri Feb 24 20:09:28 CET 2017 x86_64 Intel(R) Core(TM)2 CPU T5600 @ 1.83GHz GenuineIntel GNU/Linux % /sbin/btrfs --version btrfs-progs v4.9 > > Kai, I'd be curious whether clear_cache will help in your case, too, > > if you haven't tried it already. > > The FS in question has been rebuilt from scratch. AFAIR it wasn't even > mountable back then, or at it froze the system short after mounting. > > I needed the system back in usable state, so I had to recreate and > restore the system. I think I'm at that point now myself, unless anybody has any other ideas. What I *am* going to do before giving up and reformatting is create an image. I found out that using the -w option to btrfs-image keeps it from segfaulting, so I guess the underlying problem has to do with the extent tree? However, the image is... pretty damn big (8.6 GB by now, *after* compressing with "xz -9"), and it's not even finished yet. So, under the assumption that the image could be useful to somebody, I would welcome any suggestions for where to upload such an image once it's done. > Next time, if it happens again (finger crossed it does not), I'll give > it a try. Yeah, I hope it doesn't come back, either, for either of us. 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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