Re: [PATCH] mm, slab: clean up slab->obj_exts always

[Zhenhua Huang <quic_zhenhuah@quicinc.com>]

On 2025/4/18 23:17, Harry Yoo wrote:
> On Fri, Apr 18, 2025 at 02:14:59PM +0800, Zhenhua Huang wrote:
>> When memory allocation profiling is disabled at runtime or due to an
>> error, shutdown_mem_profiling() is called: slab->obj_exts which
>> previously allocated remains.
>> It won't be cleared by unaccount_slab() because of
>> mem_alloc_profiling_enabled() not true. It's incorrect, slab->obj_exts
>> should always be cleaned up in unaccount_slab() to avoid following error:
>>
>> [...]BUG: Bad page state in process...
>> ..
>> [...]page dumped because: page still charged to cgroup
>>
>> Fixes: 21c690a349baa ("mm: introduce slabobj_ext to support slab object extensions")
>> Signed-off-by: Zhenhua Huang<quic_zhenhuah@quicinc.com>
>> ---
> Acked-by: Harry Yoo<harry.yoo@oracle.com>
> 
> I reproduced the issue locally and confirmed that this patch fixes
> the issue.
> 
> Tested-by: Harry Yoo<harry.yoo@oracle.com>
> 
> By the way, I think this should probably be backported to -stable?

Thanks Harry, I'll send another patch that incorporates Suren's 
suggestion as well.

> 
> -- Cheers, Harry / Hyeonggon