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From: Andrew Morton <akpm@linux-foundation.org>
To: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>,
	Pekka Enberg <penberg@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Vladimir Davydov <vdavydov.dev@gmail.com>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH] slub: make sysfs file removal asynchronous
Date: Tue, 20 Jun 2017 14:58:14 -0700	[thread overview]
Message-ID: <20170620145814.9eb1b74feaf908c39e9c0de2@linux-foundation.org> (raw)
In-Reply-To: <20170620204512.GI21326@htj.duckdns.org>

On Tue, 20 Jun 2017 16:45:12 -0400 Tejun Heo <tj@kernel.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@kernel.org>
> Reported-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Fixes: bf5eb3de3847 ("slub: separate out sysfs_slab_release() from sysfs_slab_remove()")

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

  reply	other threads:[~2017-06-20 21:58 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-16 12:55 [LOCKDEP BUG] from slub: separate out sysfs_slab_release() from sysfs_slab_remove() Steven Rostedt
2017-06-19 20:35 ` Tejun Heo
2017-06-19 21:27   ` Steven Rostedt
2017-06-20 20:45     ` [PATCH] slub: make sysfs file removal asynchronous Tejun Heo
2017-06-20 21:58       ` Andrew Morton [this message]
2017-06-20 22:00         ` Tejun Heo
2017-06-20 22:22           ` Steven Rostedt
2017-06-20 22:48             ` Tejun Heo
2017-06-28 14:47               ` Christoph Lameter

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