linux-kernel - Re: memory leak in path

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Message-ID: <YCysfxN1qQoalEJH@zeniv-ca.linux.org.uk>
Date:   Wed, 17 Feb 2021 05:41:19 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     syzbot <syzbot+921ef0ccfeed3a496721@...kaller.appspotmail.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: memory leak in path_openat (2)

On Tue, Feb 16, 2021 at 09:21:14PM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    dcc0b490 Merge tag 'powerpc-5.11-8' of git://git.kernel.or..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1316c614d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a2fbb1a71525e1d5
> dashboard link: https://syzkaller.appspot.com/bug?extid=921ef0ccfeed3a496721
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1378ba4cd00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12e73fc2d00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+921ef0ccfeed3a496721@...kaller.appspotmail.com

Some observations:
	* .config is x86 one
	* merge in question is ppc-only
	* at least some "leaks" reported are dentries in devtmpfs,
	  which should stay around until the shutdown
Care to bisect to something more useful?