linux-kernel - Re: WARNING in do_dentry

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Date:   Sat, 1 Feb 2020 13:37:01 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     syzbot <syzbot+32c9f7d8a32ea5127669@...kaller.appspotmail.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in do_dentry_open (2)

On Sat, Feb 01, 2020 at 01:48:11AM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    c677124e Merge branch 'sched-core-for-linus' of git://git...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=157511bee00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a4c9892b0ce783fa
> dashboard link: https://syzkaller.appspot.com/bug?extid=32c9f7d8a32ea5127669
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1476cf66e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1640085ee00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+32c9f7d8a32ea5127669@...kaller.appspotmail.com

security_file_open() or ->open() of some file returning a positive number.  No way
to tell which one (or which file had that been) without a reproducer...