Qu Wenruo wrote: >It's caused by qgroup, and a dead lock on btrfs_drop_snapshot(). >This is one of the easiest way to trigger an ABBA deadlock. >Please either disable qgroup or apply this patch to solve it: >https://patchwork.kernel.org/patch/10725371/ Can anyone confirm that patch https://patchwork.kernel.org/patch/10725371/ (qgroup: Don't trigger backref walk at delayed ref insert time) is present in mainline Linux kernel v5.2.2 ? I seem to be getting a conflict on merging that patch with this kernel. -- Stephen.
