Re: [syzbot] WARNING in cpuset_write_resmask

[Waiman Long]

On 2/22/22 12:26, Tejun Heo wrote:
> (cc'ing Waiman and quoting whole body)
>
> Hello, Waiman.
>
> It looks like it's hitting
>
>   WARN_ON(!is_in_v2_mode() && !nodes_equal(cp->mems_allowed, cp->effective_mems))
>
> Can you take a look?

My preliminary analysis is that the warning may be caused by my commit 
1f1562fcd04a ("cgroup/cpuset: Don't let child cpusets restrict parent in 
default hierarchy") since the merge branch e5313968c41b is missing the 
fix commit d068eebbd482 ("cgroup/cpuset: Make child cpusets restrict 
parents on v1 hierarchy"). I believe the problem should be gone once the 
merge branch is updated to a later upstream baseline.

Cheers,
Longman