On Wed, May 20, 2020 at 02:58:49PM +0800, Qu Wenruo wrote:
> This patchset will fix the most wanted balance bug, runaway balance.
> All my fault, and all small fixes.
Well, that happens.
d2311e698578 ("btrfs: relocation: Delay reloc tree deletion after merge_reloc_roots")
is the most broken patch in recent history (5.1+), there were so many
fixups but hopefully this is the last one. I've tagged the patches for
5.1+ stable but we'll need manual backports due to the root refcount
changes in 5.7.
I reproduced the umount crash and verified the fix, the runaway balance
does not happen anymore in the test so I guess we have all the needed
fixes in place to allow the fast balance cancel. Thanks.
