At 09/30/2016 01:19 AM, David Sterba wrote:

On Wed, Sep 07, 2016 at 10:54:19AM +0800, Qu Wenruo wrote:

quoted

Commit 93dabf211d74daf6e3de642bdd887a90a00f7b49
Author: Mark Fasheh [off-list ref]
Date:   Fri Jun 17 13:37:48 2016 -0700

    btrfs-progs: check: verify qgroups above level 0

This commit introduced a new regression which corrupts
read_qgroup_status, since it iterate leaf with manually specified slot,
not correct path->slot[0].

This leads to wrong slot[0] and read_qgroup_status() will read out wrong
flags, leading to regression.

Fix read_qgroup_status() by using eb and slot instread of wrong path
strucutre.

Reported-by: Tsutomu Itoh <redacted>
Cc: Mark Fasheh <redacted>
Signed-off-by: Qu Wenruo <redacted>

I'm adding this patch to devel.  Do you have a test for the regression please?

Xfstests btrfs/114 can produce it.

If you mean to add btrfs-progs test case, then I can try to create a 
minimal image to reproduce it.

Thanks,
Qu