Re: PROBLEM: Crash cgdeleting empty memory cgroups with memory.kmem.limit_in_bytesset

From: Glauber Costa
Date: Thu Feb 21 2013 - 10:44:14 EST

On 02/21/2013 03:22 PM, Glauber Costa wrote:
> On 02/21/2013 03:00 AM, Tejun Heo wrote:
>> (cc'ing cgroup / memcg people and quoting whole body)
>> Looks like something is going wrong with memcg cache destruction.
>> Glauber, any ideas? Also, can we please not use names as generic as
>> kmem_cache_destroy_work_func for something specific to memcg? How
>> about something like memcg_destroy_cache_workfn?
>> Thanks.
> Steffen,
> Is there any chance you could test that using SLAB instead of SLUB?
> I haven't manage to reproduce it yet, but I am working on some theories
> about why this is happening. If I could at least know if this is likely
> a cache problem vs a inner-memcg problem, that would help. The calltrace
> is not incredibly helpful, but it does indicate that the problem happens
> when freeing cache objects.


I've already reproduced this and determined this is a problem that
plagues slub only, most likely due to initialization of the node caches.
But I still don't know for sure the exact location. Expect a patch by

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