linux-kernel - Re: splice: infinite busy loop lockup bug

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Message-ID: <af338ab6-6a35-4306-9521-57f3c769f677@i-love.sakura.ne.jp>
Date:   Fri, 7 Aug 2020 23:17:32 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Ming Lei <ming.lei@...hat.com>, Al Viro <viro@...iv.linux.org.uk>
Cc:     syzkaller-bugs@...glegroups.com,
        syzbot <syzbot+61acc40a49a3e46e25ea@...kaller.appspotmail.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: splice: infinite busy loop lockup bug

On 2020/08/07 22:41, Ming Lei wrote:
>> FWIW, my preference would be to have for_each_bvec() advance past zero-length
>> segments; I'll need to go through its uses elsewhere in the tree first, though
>> (after I grab some sleep),
> 
> Usually block layer doesn't allow/support zero bvec, however we can make
> for_each_bvec() to support it only.
> 
> Tetsuo, can you try the following patch?

Yes, this patch solves the lockup. Thank you.