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Date:      Sun, 11 Oct 2020 15:09:40 +0100
From:      RW <rwmaillists@googlemail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: errors happening with /usr/libexec/save-entropy on 12.1-p10
Message-ID:  <20201011150940.6d0f5547@gumby.homeunix.com>
In-Reply-To: <20201011030537.GA30207@rpi4.gilescoppice.lan>
References:  <20201011030537.GA30207@rpi4.gilescoppice.lan>

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On Sun, 11 Oct 2020 04:05:37 +0100
tech-lists wrote:

> Hi,
> 
> I've noticed recently in the daily security email that *sometimes*
> when this is run out of /etc/crontab on a 12.1-p10 system:
> 
> # Save some entropy so that /dev/random can re-seed on boot.
> */11    *       *       *       *       operator
> /usr/libexec/save-entropy
> 
> that it'll generate an error visible in the security email like this:
> 
> [redacted] kernel log messages: +pid 12995 (dd), uid 2 inumber 2086730
> on /: filesystem full
> 
> (the filesystem has plenty of inodes spare and plenty of space)
> 
> It's the only one I've seen so far (12.1-p10) with this issue.
> 12-stable doesn't have this problem, but the

If it fails on 12.1 but not on 12-stable that would imply that
it's a long standing problem and something was fixed in stable. There's
no sign that anything like that happened.

I think it's  unlikely that this is caused by save-entropy. All it
does is dd the output of /dev/random to a file and rotate the files.

When you say that there's plenty of space, are you allowing for the
fact that the operator user can't write to space reserved for root.  



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