From: Minchan Kim <minchan@kernel.org>
To: John Hubbard <jhubbard@nvidia.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
syzbot <syzbot+acf65ca584991f3cc447@syzkaller.appspotmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
llvm@lists.linux.dev, nathan@kernel.org, ndesaulniers@google.com,
syzkaller-bugs@googlegroups.com, trix@redhat.com,
Matthew Wilcox <willy@infradead.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
David Hildenbrand <david@redhat.com>
Subject: Re: [syzbot] WARNING in follow_hugetlb_page
Date: Fri, 13 May 2022 17:26:07 -0700 [thread overview]
Message-ID: <Yn73Hz7LkSUv7ycw@google.com> (raw)
In-Reply-To: <4809b134-a37a-50b8-4c25-44548bc1048f@nvidia.com>
On Fri, May 13, 2022 at 05:09:11PM -0700, John Hubbard wrote:
> On 5/13/22 16:54, Minchan Kim wrote:
> > > > I isolated this to Minchan Kim's "mm: fix is_pinnable_page against on cma
> > > > page". Yes, the fat finger fix is in next-20220513.
> > > >
> > > > I don't have time to analyze right now, but can confirm that in the
> > > > reproducer is_pinnable_page is returning false after this change when it
> > > > previously returned true.
> > >
> > > OK, thanks, I dropped mm-fix-is_pinnable_page-against-on-cma-page.patch
> >
> > Seems like bug of the patch v5 due to change of this
> >
> > if (mt & (MIGRATE_CMA | MIGRATE_ISOLATE))
> >
> > The migration type is not bit type so it shold be
> >
> > if (mt == MIGRATE_CMA || mt == MIGRATE_ISOLATE)
> >
>
> Sorry for leading you astray by recommending the bitwise OR, Minchan.
> I overlooked that point even though it was right in front of me.
No worry, John.
Anything else further can we get insight from the warning?
For example, pin_user_pages going on against a hugetlb page
which are concurrently running alloc_contig_range(it's
exported function so anyone can call randomly) so
alloc_contig_range changes pageblock type as MIGRATE_ISOLATE
under us so the hit at the warning?
next prev parent reply other threads:[~2022-05-14 0:26 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-13 9:03 [syzbot] WARNING in follow_hugetlb_page syzbot
2022-05-13 16:43 ` syzbot
2022-05-13 17:26 ` Andrew Morton
2022-05-13 18:09 ` Mike Kravetz
2022-05-13 22:48 ` Mike Kravetz
2022-05-13 23:19 ` Andrew Morton
2022-05-13 23:54 ` Minchan Kim
2022-05-14 0:09 ` John Hubbard
2022-05-14 0:26 ` Minchan Kim [this message]
2022-05-14 0:56 ` John Hubbard
2022-05-14 1:16 ` John Hubbard
2022-05-17 3:37 ` Mike Kravetz
2022-05-18 7:12 ` John Hubbard
2022-05-20 22:19 ` Minchan Kim
2022-05-20 22:56 ` John Hubbard
2022-05-20 23:25 ` Minchan Kim
2022-05-20 23:31 ` Mike Kravetz
2022-05-20 23:43 ` Minchan Kim
2022-05-21 0:04 ` Mike Kravetz
2022-05-21 15:24 ` Minchan Kim
2022-05-21 15:51 ` David Hildenbrand
2022-05-21 16:36 ` Minchan Kim
2022-05-21 16:46 ` David Hildenbrand
2022-05-21 18:25 ` Minchan Kim
2022-05-21 23:50 ` Mike Kravetz
2022-05-14 0:18 ` Andrew Morton
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