From: Dmitry Vyukov <dvyukov@google.com>
To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
syzbot <syzbot+57876cfc2dca0c6b2e6a@syzkaller.appspotmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] BUG: unable to handle kernel paging request in alloc_huge_page
Date: Mon, 16 Aug 2021 09:47:51 +0200 [thread overview]
Message-ID: <CACT4Y+aEo5qWg0CmjUQsi3UXwmiCwmK93XUnt+DfRUtD2YLTmg@mail.gmail.com> (raw)
In-Reply-To: <5810d827-c050-52b6-1b98-8deb99ceda9c@oracle.com>
On Sun, 15 Aug 2021 at 20:17, Mike Kravetz <mike.kravetz@oracle.com> wrote:
>
> On 8/14/21 4:24 PM, Matthew Wilcox wrote:
> > On Sat, Aug 14, 2021 at 03:06:52PM -0700, Andrew Morton wrote:
> >> On Sat, 14 Aug 2021 04:07:23 -0700 syzbot <syzbot+57876cfc2dca0c6b2e6a@syzkaller.appspotmail.com> wrote:
> >>> HEAD commit: 92d00774360d Add linux-next specific files for 20210810
> >>> RIP: 0010:__list_add include/linux/list.h:71 [inline]
> >>> RIP: 0010:list_add include/linux/list.h:86 [inline]
> >>> RIP: 0010:alloc_huge_page+0xdcb/0x11b0 mm/hugetlb.c:2821
> >>
> >> That appears to be
> >>
> >> list_add(&page->lru, &h->hugepage_activelist);
> >>
> >> I'm suspecting Mike's surplus page changes?
> >
> > Is this not the same as
> > https://lore.kernel.org/linux-mm/846c4502-3332-0d25-87f5-cb3b71afc38f@quicinc.com/
> > which is already patched in your tree?
>
> Yes, I believe it is the same, and already fixed. RCX: fffffffffffffffc
> makes me 99.9% confident.
Let's tell syzbot about the fix:
#syz fix:
mm/hugetlb: Initialize page to NULL in alloc_buddy_huge_page_with_mpol()
next prev parent reply other threads:[~2021-08-16 7:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-14 11:07 [syzbot] BUG: unable to handle kernel paging request in alloc_huge_page syzbot
2021-08-14 22:06 ` Andrew Morton
2021-08-14 23:24 ` Matthew Wilcox
2021-08-15 18:17 ` Mike Kravetz
2021-08-16 7:47 ` Dmitry Vyukov [this message]
2021-08-16 17:00 ` Mike Kravetz
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