On 2019/7/27 上午12:31, Stephen R. van den Berg wrote: > 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 ?
Upstream goes with a better solution:
Fixes: 38e3eebff643 ("btrfs: honor path->skip_locking in backref code")
Thanks,
Qu
>
> I seem to be getting a conflict on merging that patch with this kernel.
>
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