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Date: Tue, 19 Jan 2016 22:48:41 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
        Dmitry Vyukov <dvyukov@google.com>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Sasha Levin <sasha.levin@oracle.com>, jmarchan@redhat.com,
        Hugh Dickins <hughd@google.com>, Dave Hansen <dave.hansen@intel.com>,
        David Rientjes <rientjes@google.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        Dan Williams <dan.j.williams@intel.com>,
        Minchan Kim <minchan@kernel.org>,
        "linux-mm\@kvack.org" <linux-mm@kvack.org>,
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        syzkaller <syzkaller@googlegroups.com>,
        Kostya Serebryany <kcc@google.com>,
        Alexander Potapenko <glider@google.com>
Subject: Re: mm: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected in
 split_huge_page_to_list
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On Wed, 20 Jan 2016 11:15:32 +0530 "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> wrote:

> >
> > I think this should fix the issue:
> >
> > From 10859758dadfa249616870f63c1636ec9857c501 Mon Sep 17 00:00:00 2001
> > From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> > Date: Mon, 18 Jan 2016 16:28:12 +0300
> > Subject: [PATCH] thp: fix interrupt unsafe locking in split_huge_page()
> >
> > split_queue_lock can be taken from interrupt context in some cases, but
> > I forgot to convert locking in split_huge_page() to interrupt-safe
> > primitives.
> >
> > Let's fix this.
> 
> Can you add the stack trace from the problem reported to the commit
> message ?

I have already done this.