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Subject: Re: disk revalidation updates and OOM
To:     Martin Wilck <mwilck@suse.com>, Christoph Hellwig <hch@lst.de>,
        jack@suse.cz, Jens Axboe <axboe@kernel.dk>,
        viro@zeniv.linux.org.uk, bvanassche@acm.org, keith.busch@intel.com,
        tglx@linutronix.de, yuyufen@huawei.com,
        linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org
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From:   He Zhe <zhe.he@windriver.com>
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Date:   Mon, 16 Mar 2020 19:02:02 +0800
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On 3/11/20 11:11 PM, Martin Wilck wrote:
> On Wed, 2020-03-11 at 11:29 +0100, Martin Wilck wrote:
>> On Mon, 2020-03-02 at 11:55 +0800, He Zhe wrote:
>>> Hi,
>>>
>>> Since the following commit
>>> https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=for-5.5/disk-revalidate&id=6917d0689993f46d97d40dd66c601d0fd5b1dbdd
>>> until now(v5.6-rc4),
>>>
>>> If we start udisksd service of systemd(v244), systemd-udevd will
>>> scan
>>> /dev/hdc
>>> (the cdrom device created by default in qemu(v4.2.0)). systemd-
>>> udevd
>>> will
>>> endlessly run and cause OOM.
>> I've tried to reproduce this, but so far I haven't been able to.
>> Perhaps because the distro 5.5.7 kernel I've tried (which contains
>> the
>> offending commit 142fe8f) has no IDE support - the qemu IDE CD shows
>> up
>> as sr0, with the ata_piix driver. I have systemd-udevd 244. Enabling
>> udisksd makes no difference, the system runs stably. ISO images can
>> be "ejected" and loaded, single uevents are received and processed.
>>
>> Does this happen for you if you use ata_piix?
> I have enabled the ATA drivers on my test system now, and I still don't
> see the issue. "hd*" for CDROM devices has been marked deprecated in
> udev since 2009 (!).
>
> Is it possible that you have the legacy udisksd running, and didn't
> disable CD-ROM polling?

Thanks for the suggestion, I'll try this ASAP.

Zhe

>
> Martin
>
>