linux-kernel - Re: [PATCH] slub: make sysfs file removal asynchronous

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Date:   Tue, 20 Jun 2017 14:58:14 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] slub: make sysfs file removal asynchronous

On Tue, 20 Jun 2017 16:45:12 -0400 Tejun Heo <tj@...nel.org> wrote:

> bf5eb3de3847 ("slub: separate out sysfs_slab_release() from
> sysfs_slab_remove()") made slub sysfs file removals synchronous to
> kmem_cache shutdown.  Unfortunately, this created a possible ABBA
> deadlock between slab_mutex and sysfs draining mechanism triggering
> the following lockdep warning.
> 
> ...
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reported-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> Tested-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> Fixes: bf5eb3de3847 ("slub: separate out sysfs_slab_release() from sysfs_slab_remove()")

Do you think we should add cc:stable [4.11+]?