linux-kernel - Re: [syzbot] KASAN: null-ptr-deref Read in hugepage_vma

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Date:   Sat, 25 Jun 2022 10:36:14 -0700
From:   syzbot <syzbot+4d875b4d2e2b60bae9b4@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, shy828301@...il.com,
        syzkaller-bugs@...glegroups.com, willy@...radead.org,
        zokeefe@...gle.com
Subject: Re: [syzbot] KASAN: null-ptr-deref Read in hugepage_vma_check

syzbot has bisected this issue to:

commit 0a44ebaaa3f3ecfacd2744467957882eabd92cec
Author: Yang Shi <shy828301@...il.com>
Date:   Thu Jun 16 17:48:37 2022 +0000

    mm: thp: kill transparent_hugepage_active()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=166ba760080000
start commit:   34d1d36073ea Add linux-next specific files for 20220621
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=156ba760080000
console output: https://syzkaller.appspot.com/x/log.txt?x=116ba760080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b24b62d1c051cfc8
dashboard link: https://syzkaller.appspot.com/bug?extid=4d875b4d2e2b60bae9b4
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14097a3ff00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1466c63ff00000

Reported-by: syzbot+4d875b4d2e2b60bae9b4@...kaller.appspotmail.com
Fixes: 0a44ebaaa3f3 ("mm: thp: kill transparent_hugepage_active()")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection