linux-kernel - Re: BUG: sleeping function called from invalid context in do_user_addr

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Date:   Wed, 02 Sep 2020 14:41:06 -0700
From:   syzbot <syzbot+7748c5375dc20dfdb92f@...kaller.appspotmail.com>
To:     bp@...en8.de, daniel.vetter@...ll.ch, ebiggers@...nel.org,
        gregkh@...uxfoundation.org, hpa@...or.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        luto@...nel.org, mingo@...hat.com,
        penguin-kernel@...ove.SAKURA.ne.jp,
        penguin-kernel@...ove.sakura.ne.jp,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        viro@...iv.linux.org.uk, x86@...nel.org
Subject: Re: BUG: sleeping function called from invalid context in do_user_addr_fault

syzbot suspects this issue was fixed by commit:

commit 033724d6864245a11f8e04c066002e6ad22b3fd0
Author: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Date:   Wed Jul 15 01:51:02 2020 +0000

    fbdev: Detect integer underflow at "struct fbcon_ops"->clear_margins.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=156ad38e900000
start commit:   7cc2a8ea Merge tag 'block-5.8-2020-07-01' of git://git.ker..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=183dd243398ba7ec
dashboard link: https://syzkaller.appspot.com/bug?extid=7748c5375dc20dfdb92f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1469d28f100000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: fbdev: Detect integer underflow at "struct fbcon_ops"->clear_margins.

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