On 2019/1/24 上午1:47, David Sterba wrote:
> On Wed, Jan 23, 2019 at 03:15:11PM +0800, Qu Wenruo wrote:
>> v5:
>> - Use Josef's superior qgroup deadlock fix.
>>   No performance regression now.
> 
> Does this pass fstests on your side? Namely if test btrfs/007 does not
> crash,
> https://lore.kernel.org/linux-btrfs/20190123135120.GT2900@twin.jikos.cz/
> 

Also hit that bug.

Although it's not trigger by qgroup but a backref walk on current root
causing the problem.

Thanks,
Qu