On Tue, May 22, 2018 at 07:05:14PM +0800, Su Yue wrote:
> Hi Liu and David,
> During my local xfstests on kdave/for-next, btrfs/139 failed and
> btrfs BUG_ON due to qgroup rescan.
> The bisect result is commit 560215eb3f32("Merge branch
> 'ext/liubo/search-cleanups-wip' into for-next-next-v4.18-20180521")
> which seems merged this patchset.
> The dmesg file is attached.
>
> On 05/18/2018 11:00 AM, Liu Bo wrote:
> > Here are a collection of patches I did for btrfs_search_slot().
> >
> > v2: more explicit commit log for each patch.
> >
> > Liu Bo (6):
> > Btrfs: remove superfluous free_extent_buffer
> > Btrfs: use more straightforward extent_buffer_uptodate
> > Btrfs: move get root of btrfs_search_slot to a helper
> > Btrfs: remove unused check of skip_locking
> > Btrfs: grab write lock directly if write_lock_level is the max level
> > Btrfs: remove always true check in unlock_up
> >
> > fs/btrfs/ctree.c | 121 +++++++++++++++++++++++++++++++++----------------------
> > 1 file changed, 73 insertions(+), 48 deletions(-)
> >
>
>
> [ 46.129166] BTRFS info (device vdb): disk space caching is enabled
> [ 46.130545] BTRFS info (device vdb): has skinny extents
> [ 46.171386] mount (2798) used greatest stack depth: 12920 bytes left
> [ 46.508170] BTRFS: device fsid 83a117c7-a9ea-4bf5-b42f-7092078610d5 devid 1 transid 5 /dev/vdc
> [ 46.562428] BTRFS info (device vdc): disk space caching is enabled
> [ 46.563690] BTRFS info (device vdc): has skinny extents
> [ 46.564563] BTRFS info (device vdc): flagging fs with big metadata feature
> [ 46.587441] BTRFS info (device vdc): checking UUID tree
> [ 46.766765] BTRFS info (device vdb): disk space caching is enabled
> [ 46.768197] BTRFS info (device vdb): has skinny extents
> [ 46.875534] run fstests btrfs/139 at 2018-05-22 18:40:36
> [ 47.559411] BTRFS: device fsid 065f3825-057e-451f-8722-0d94d4a3f36f devid 1 transid 5 /dev/vdc
> [ 47.612001] BTRFS info (device vdc): disk space caching is enabled
> [ 47.613254] BTRFS info (device vdc): has skinny extents
> [ 47.614147] BTRFS info (device vdc): flagging fs with big metadata feature
> [ 47.632377] BTRFS info (device vdc): checking UUID tree
> [ 47.681656] btrfs (3176) used greatest stack depth: 12632 bytes left
> [ 47.691156] ------------[ cut here ]------------
> [ 47.692084] kernel BUG at fs/btrfs/locking.c:286!
I saw the crash too but did not investigate the root cause. So I'll
remove the branch from for-next until it's fixed. Thanks for the report.
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