linux-kernel - Re: [syzbot] KASAN: invalid-free in io_clean

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Date:   Mon, 26 Sep 2022 11:04:03 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     syzbot <syzbot+edfd15cd4246a3fc615a@...kaller.appspotmail.com>,
        axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: invalid-free in io_clean_op

On 9/25/22 18:54, Pavel Begunkov wrote:
> On 9/25/22 18:29, syzbot wrote:
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit:    aaa11ce2ffc8 Add linux-next specific files for 20220923
>> git tree:       linux-next
>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1608cadf080000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294
>> dashboard link: https://syzkaller.appspot.com/bug?extid=edfd15cd4246a3fc615a
>> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=144acdef080000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10686540880000
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+edfd15cd4246a3fc615a@...kaller.appspotmail.com
> 
> #syz test: git://git.kernel.dk/linux.git for-6.1/io_uring

Should be similar to the previous net/op_clean problem but
now zc and because of that we set CLEANUP too early. Just
a guess, will take a look at the repro

-- 
Pavel Begunkov