Hello,
On Fri, Jun 14, 2019 at 04:08:33PM +0100, Chris Wilson wrote:
> #ifdef CONFIG_MEMCG
> if (slab_state >= FULL && err >= 0 && is_root_cache(s)) {
> struct kmem_cache *c;
>
> mutex_lock(&slab_mutex);
>
> so it happens to hit the error + FULL case with the additional slabcaches?
>
> Anyway, according to lockdep, it is dangerous to use the slab_mutex inside
> slab_attr_store().
Didn't really look into the code but it looks like slab_mutex is held
while trying to remove sysfs files. sysfs file removal flushes
on-going accesses, so if a file operation then tries to grab a mutex
which is held during removal, it leads to a deadlock.
Thanks.
--
tejun
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