On 2018/12/28 下午9:40, Stephen R. van den Berg wrote: > Qu Wenruo wrote: >>> Ok. Finally have a sysrq+w output of 4.19.8. >>> The uptime of this system has been a few days. It has already received quite >>> some btrfs-sends in that time (every night). When the sysrq+w output was >>> taken, the system started to get more and more processes in a D kernel state >>> bordering on becoming unusable. I had to hard-reset the system after this >>> to get it going again. > >> 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/ > > Any idea in which kernel version this patch is/will be included? > If we're lucky enough, it would be v5.0 or v4.21. It may be more likely for v5.1 or v4.22, as there are tons of pending qgroup related patches for v5.0/v4.21. Thanks, Qu
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