linux-kernel - Re: inconsistent lock state in xa

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Date:   Thu, 8 Oct 2020 09:06:56 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     syzbot <syzbot+cdcbdc0bd42e559b52b9@...kaller.appspotmail.com>,
        io-uring@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: inconsistent lock state in xa_destroy

On 10/8/20 9:05 AM, Matthew Wilcox wrote:
> On Thu, Oct 08, 2020 at 09:01:57AM -0600, Jens Axboe wrote:
>> On 10/8/20 9:00 AM, syzbot wrote:
>>> Hello,
>>>
>>> syzbot found the following issue on:
>>>
>>> HEAD commit:    e4fb79c7 Add linux-next specific files for 20201008
>>> git tree:       linux-next
>>> console output: https://syzkaller.appspot.com/x/log.txt?x=12555227900000
>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=568d41fe4341ed0f
>>> dashboard link: https://syzkaller.appspot.com/bug?extid=cdcbdc0bd42e559b52b9
>>> compiler:       gcc (GCC) 10.1.0-syz 20200507
>>>
>>> Unfortunately, I don't have any reproducer for this issue yet.
>>>
>>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>>> Reported-by: syzbot+cdcbdc0bd42e559b52b9@...kaller.appspotmail.com
>>
>> Already pushed out a fix for this, it's really an xarray issue where it just
>> assumes that destroy can irq grab the lock.
> 
> ... nice of you to report the issue to the XArray maintainer.

This is from not even 12h ago, 10h of which I was offline. It wasn't on
the top of my list of priority items to tackle this morning, but it
is/was on the list.

-- 
Jens Axboe