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Date:   Mon, 18 Oct 2021 06:47:45 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Zqiang <qiang.zhang1211@gmail.com>
Cc:     Hao Sun <sunhao.th@gmail.com>, Hillf Danton <hdanton@sina.com>,
        hch@infradead.org, willy@infradead.org,
        Linux MM <linux-mm@kvack.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Christoph Hellwig <hch@lst.de>, syzkaller-bugs@googlegroups.com
Subject: Re: WARNING in __init_work
Message-ID: <20211018044745.GA23657@lst.de>
References: <CACkBjsZfAZpOFeYC8mQ03r_JB_eF-dNMEkXf3LNji7_CgOCF2Q@mail.gmail.com> <20210907074432.3711-1-hdanton@sina.com> <CACkBjsYsxNqkup1FQkP4eMzxZ_xNgifPx+gFxEo0gnBUYPp1PQ@mail.gmail.com> <d242861c-5c41-0d1b-3f71-43f50e5a3b68@gmail.com>
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On Mon, Oct 18, 2021 at 12:43:38PM +0800, Zqiang wrote:
> This is the details of the test, Hope it helps you

Call me stupid, but I can only find the trace and linked to unreadable
google sites that wan't me to log in somehow and no actual details.

If you have a direct link to the reproducer (an attachment would do
it as well) I'd love to try it myself.

Otherwise this commit in the block-5.15 tree should help to catch what
I suspect is the root cause (final ref drop before unregister) earlier
and with a better backtrace:

https://git.kernel.dk/cgit/linux-block/commit/?h=block-5.15&id=a20417611b98e12a724e5c828c472ea16990b71f