Re: cgroup null pointer dereference

[Waiman Long]

On 4/25/25 11:11 AM, hch wrote:
> On Fri, Apr 25, 2025 at 11:04:58AM -0400, Waiman Long wrote:
> > On 4/25/25 10:54 AM, hch wrote:
> > > On Fri, Apr 25, 2025 at 02:22:31AM +0000, Kamaljit Singh wrote:
> > > > > It should also be in v6.15-rc1 branch but is missing in the nvme branch
> > > > > that you are using. So you need to use a more updated nvme, when
> > > > > available, to avoid this problem.
> > > > Thank you for finding that commit. I'll look for it.
> > > >
> > > > Christoph, Sagi, Keith, Others,
> > > > Can this commit be merged into the nvme-6.15 branch please?
> > > What commit?
> > commit 7d6c63c31914 ("cgroup: rstat: call cgroup_rstat_updated_list with
> > cgroup_rstat_lock")
> I don't see how that is relevant for the nvme tree?
The nvme-6.15-2025-04-10 branch used by Kmaljit includes some v6.15
commits like the cgroup commit 093c8812de2d3 ("cgroup: rstat:
Cleanup flushing functions and locking") but not its fix commit
7d6c63c31914 ("cgroup: rstat: call cgroup_rstat_updated_list with
cgroup_rstat_lock"). That can cause system crash in some cases. That
problem will be resolved if nvme is rebased on top of v6.15-rc1 or
later as the fix commit will be included.

Cheers,
Longman