linux-kernel - Re: WARNING in ep_poll

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Date:   Mon, 11 Mar 2019 14:37:51 +0100
From:   Roman Penyaev <rpenyaev@...e.de>
To:     akpm@...ux-foundation.org
Cc:     dbueso@...e.de, dvyukov@...gle.com, jbaron@...mai.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        paulmck@...ux.vnet.ibm.com, sfr@...b.auug.org.au,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: WARNING in ep_poll_callback

Hi Andrew,

I thought "epoll: loosen irq safety in ep_poll_callback()" patch was
removed from your tree, at least I got a notification on 9th of january,
also I do not see it in the linux-next tree.

Should I ignore this syzbot message?

--
Roman

On 2019-03-11 14:14, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit f92cacf118171208f62519d92502a8dd0341286d
> Author: Roman Penyaev <rpenyaev@...e.de>
> Date:   Tue Jan 8 01:15:44 2019 +0000
> 
>     epoll: loosen irq safety in ep_poll_callback()
> 
> bisection log:  
> https://syzkaller.appspot.com/x/bisect.txt?x=107ae15f200000
> start commit:   f92cacf1 epoll: loosen irq safety in ep_poll_callback()
> git tree:       linux-next
> final crash:    
> https://syzkaller.appspot.com/x/report.txt?x=127ae15f200000
> console output: 
> https://syzkaller.appspot.com/x/log.txt?x=147ae15f200000
> kernel config:  
> https://syzkaller.appspot.com/x/.config?x=1521b074ff5a5bdf
> dashboard link: 
> https://syzkaller.appspot.com/bug?extid=aea82bf9ee6ffd9a79d9
> userspace arch: amd64
> syz repro:      
> https://syzkaller.appspot.com/x/repro.syz?x=1776034b400000
> C reproducer:   
> https://syzkaller.appspot.com/x/repro.c?x=14c2e580c00000
> 
> Reported-by: syzbot+aea82bf9ee6ffd9a79d9@...kaller.appspotmail.com
> Fixes: f92cacf1 ("epoll: loosen irq safety in ep_poll_callback()")