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Re: systemd mdadm spamming my syslog

Bob Weber <bobrweber@xxxxxxxxx> writes:

> On 3/10/19 5:20 PM, Joe Pfeiffer wrote:
>  Since a recent update, my /var/log/syslog is getting spammed with huge
> numbers of messages of the form
> Mar 10 14:02:25 snowball systemd-udevd[18681]: Process '/sbin/mdadm --incremental --export /dev/sda3 --offroot /dev/disk/by-id/ata-ST3000DM001-1ER166_Z501MTQ3-part3 /dev/disk/by-partuuid/ad6f31ee-1866-400c-84f8-2c54da6abd2e /dev/disk/by-path/pci-0000:00:11.0-ata-1-part3 /dev/disk/by-id/wwn-0x5000c50086c86ae8-part3' failed with exit code 1.
> When I run the command by hand, I get
> root@snowball:~# /sbin/mdadm --incremental --export /dev/sda3 --offroot /dev/disk/by-id/ata-ST3000DM001-1ER166_Z501MTQ3-part3 /dev/disk/by-partuuid/ad6f31ee-1866-400c-84f8-2c54da6abd2e /dev/disk/by-path/pci-0000:00:11.0-ata-1-part3 /dev/disk/by-id/wwn-0x5000c50086c86ae8-part3
> mdadm: cannot reopen /dev/sda3: Device or resource busy.
> Which at least gives me a small clue, but really not much of one.
> I'm not even really clear on whther this is a systemd or mdadm bug.
> So, some questions:
> 1) what is this command trying to do?  I do understand a little about mdadm,
> and am running a RAID 1 array on this machine.  But this is using an
> option (--offroot) that doesn't even appear in the man page, and I've
> got no idea what it's trying to accomplish.
> 2) how can I make it stop?
> I also have these kind of messages for my 3 raid1 arrays.  The messages started after an update to testing done on 2/26/18 and have continued up to 3/11/18
> (today).   I looked at the terminal logs and I was running udev (240-6) (installed 2/22) and mdadm (4.1-1) (installed 2/6).  My udev is now at 241-1 and mdadm is still
> at 4.1-1.

I'm seeing it at those versions, also.

> Since the arrays are started correctly as shown by "cat /proc/mdstat" I haven't paid much attention to these messages.  They only occur at boot.

The arrays are started correctly, but I'm getting bursts of these
messages every five minutes so it's annoying.

> My system is running testing and I do an upgrade just about every day.

Same here.