linux-kernel - KASAN: null-ptr-deref Read in reclaim

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Message-ID: <0000000000001fd5780583d1433f@google.com>
Date:   Mon, 11 Mar 2019 06:08:01 -0700
From:   syzbot <syzbot+fa11f9da42b46cea3b4a@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, cgroups@...r.kernel.org,
        hannes@...xchg.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, mhocko@...nel.org, mhocko@...e.com,
        sfr@...b.auug.org.au, shakeelb@...gle.com,
        syzkaller-bugs@...glegroups.com, vdavydov.dev@...il.com
Subject: KASAN: null-ptr-deref Read in reclaim_high

syzbot has bisected this bug to:

commit 29a4b8e275d1f10c51c7891362877ef6cffae9e7
Author: Shakeel Butt <shakeelb@...gle.com>
Date:   Wed Jan 9 22:02:21 2019 +0000

     memcg: schedule high reclaim for remote memcgs on high_work

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=155bf5db200000
start commit:   29a4b8e2 memcg: schedule high reclaim for remote memcgs on..
git tree:       linux-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=175bf5db200000
console output: https://syzkaller.appspot.com/x/log.txt?x=135bf5db200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=611f89e5b6868db
dashboard link: https://syzkaller.appspot.com/bug?extid=fa11f9da42b46cea3b4a
userspace arch: amd64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14259017400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=141630a0c00000

Reported-by: syzbot+fa11f9da42b46cea3b4a@...kaller.appspotmail.com
Fixes: 29a4b8e2 ("memcg: schedule high reclaim for remote memcgs on  
high_work")