> -----Original Message----- > From: chris@xxxxxxxxxxxxxxxxx [mailto:chris@xxxxxxxxxxxxxxxxx] On > > On Thu, Sep 1, 2016 at 12:51 AM, Paul Jones <paul@xxxxxxxxxxxxxxx> wrote: > >> -----Original Message----- > >> From: linux-btrfs-owner@xxxxxxxxxxxxxxx [mailto:linux-btrfs- > >> owner@xxxxxxxxxxxxxxx] On Behalf Of Chris Murphy > >> Sent: Thursday, 1 September 2016 7:59 AM > >> To: Btrfs BTRFS <linux-btrfs@xxxxxxxxxxxxxxx> > >> Subject: Re: btrfs-progs 4.7, check reports many "incorrect local > >> backref count" messages > >> > >> This is still happening with btrfs-progs 4.7.1 and there is zero > >> information in the long result what to do about the problem, and > >> whether it's sane to try have --repair fix it, let alone what the original > cause of the problem was. > > > > I just potentially damaged a perfectly good filesystem because of this. I was > getting hundreds of "Incorrect local backref count" so I decided to try repair, > which seemed to complete ok. I then rescanned without repair and btrfs > check eventually crashed with an assertion. That's when I figured something > may be wrong. > > Wait, so you did a --repair and then the following-up check crashes? > But does the file system mount and does it still work? The first is bad enough, > but if it won't mount this is terrible. Correct. I forgot to mention the crash was with btrfs-progs 4.7.1 and kernel 4.7.2. After that I reverted to btrfs-progs 4.6.1 and kernel 4.6.7 The filesystem still mounted, so I tried to run scrub but that got stuck at 0 bytes (with no errors). I reset the system (reboot didn't finish) and run repair a few more times, and even though there were still errors every time I noticed the last few errors appeared to be the same. I mounted and tried scrub again, which worked the second time. I let it run overnight and it didn't find any errors. I'm just about to rsync (with checksums) from the backup to verify the data is still good. I'd suggest btrfs-progs 4.7.x is withdrawn until this can be fixed. Paul. ��.n��������+%������w��{.n�����{����n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�
