linux-kernel - Re: possible deadlock in aio

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Message-ID: <20180911063335.GA3315@infradead.org>
Date:   Mon, 10 Sep 2018 23:33:35 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     Christoph Hellwig <hch@...radead.org>,
        syzbot <syzbot+5b1df0420c523b45a953@...kaller.appspotmail.com>,
        bcrl <bcrl@...ck.org>, linux-aio <linux-aio@...ck.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: possible deadlock in aio_poll

On Mon, Sep 10, 2018 at 08:14:20PM +0200, Miklos Szeredi wrote:
> Why do pollable waitqueues need to disable interrupts generally?

Any waitqueue needs to disable interrupts for consistency.  We
always use spin_lock_irqsave in __wake_up_common_lock() for example.