linux-kernel - Re: KASAN: null-ptr-deref Read in refcount_sub_and_test

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Date:   Thu, 21 Mar 2019 10:39:01 -0700
From:   syzbot <syzbot+0468b73bdbb243217224@...kaller.appspotmail.com>
To:     kyungmin.park@...sung.com, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, m.szyprowski@...sung.com,
        mchehab@...nel.org, pawel@...iak.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: null-ptr-deref Read in refcount_sub_and_test_checked (2)

Bisection is inconclusive: the bug happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13b0323b200000
start commit:   [unknown
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1070323b200000
console output: https://syzkaller.appspot.com/x/log.txt?x=17b0323b200000
dashboard link: https://syzkaller.appspot.com/bug?extid=0468b73bdbb243217224
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16d20893400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=118f5a2b400000

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