-----Original Message-----
From: chris@colorremedies.com [mailto:chris@colorremedies.com] On

On Thu, Sep 1, 2016 at 12:51 AM, Paul Jones [off-list ref] wrote:

quoted

quoted

-----Original Message-----
From: linux-btrfs-owner@vger.kernel.org [mailto:linux-btrfs-
owner@vger.kernel.org] On Behalf Of Chris Murphy
Sent: Thursday, 1 September 2016 7:59 AM
To: Btrfs BTRFS <redacted>
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.

quoted

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I'd suggest btrfs-progs 4.7.x is withdrawn until this can be fixed.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.
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