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Date:   Wed, 4 Mar 2020 17:26:25 +0100
From:   Christoph Hellwig <>
To:     Jan Kara <>
Cc:     He Zhe <>, Christoph Hellwig <>,
        Jens Axboe <>,,,,,,,,,
Subject: Re: disk revalidation updates and OOM

On Wed, Mar 04, 2020 at 02:37:38PM +0100, Jan Kara wrote:
> Hi!
> On Mon 02-03-20 11:55:44, He Zhe wrote:
> > Since the following commit
> >
> > 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.
> Thanks for report! The commit you mention has this:
> There is a small behavior change in that we now send the kevent change
> notice also if we were not invalidating but no partitions were found, which
> seems like the right thing to do.
> And apparently this confuses systemd-udevd because it tries to open
> /dev/hdc in response to KOBJ_CHANGE event on that device and the open calls
> rescan_partitions() which generates another KOBJ_CHANGE event.  So I'm
> afraid we'll have to revert to the old behavior of not sending KOBJ_CHANGE
> event when there are no partitions found. Christoph?

Looks like it.  Let me figure out how to best do that.

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