Re: [CORRUPTION FILESYSTEM] Corrupted and unrecoverable file system during the snapshot receive

[Qu Wenruo <quwenruo@cn.fujitsu.com>]

At 11/21/2016 08:09 PM, bepi@adria.it wrote:
> Hi.
>
> My system: Fedora 23, kernel-4.7.10-100.fc23.x86_64 btrfs-progs-4.4.1-1.fc23.x86_64
>
> Testing the remote differential receive (via ssh and in local network) of 24
> sequential snapshots, and simultaneously deleting the snapshot, (in the same
> file system, but in a different subvolume), there has been an file access error,
> and the file system has corrupt.

Are you using qgroup?

IIRC, Filipe fixed a problem which could cause backref corruption which 
only happens if quota is enabled.

Thanks,
Qu

>
> Both scrub, both recovery and clear_cache mount options, both btrfsck, have
> failed, the file system is left in a state unusable.
>
> After reformatting the filesystem, remote receive of 24 snapshots worked properly.
>
> The file system is used exclusively for receive the snapshot, it is composed of
> a single device.
> The initial snapshot is a linux installation of 50Gb.
>
>
> I think that there was a race condition between the receive and deletion of
> snapshots (that were performed on two different subvolume).
>
>
> Best regards.
>
> gdb
>
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