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Date:      Sun, 27 Nov 2022 12:46:13 +0100
From:      Miroslav Lachman <000.fbsd@quip.cz>
To:        David Wolfskill <david@catwhisker.org>, Jonathan Vasquez <jon@xyinn.org>, void@f-m.fm, freebsd-stable@freebsd.org
Subject:   Re: savecore: operation not permitted
Message-ID:  <47e7548e-0a19-21ef-609a-36b644553c62@quip.cz>
In-Reply-To: <Y4NIv3%2BH0fnDUkn0@albert.catwhisker.org>
References:  <Y4JYp7YDmsYZybab@sysmon.zyxst.net> <_nTojcbkVMksWqsbOXlWk4Vktpu7EU7wJRDP3NjXeCTbrs7GCiAt6Ubb34v-3-1vT8vKCqWvPXYlM8iIeeX8pawVT6JwlKfD2jJLsm3TZMg=@xyinn.org> <Y4NIv3%2BH0fnDUkn0@albert.catwhisker.org>

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On 27/11/2022 12:23, David Wolfskill wrote:
> On Sun, Nov 27, 2022 at 05:48:13AM +0000, Jonathan Vasquez wrote:
>> Make sure you aren't using an encrypted swap (i.e if you have the .eli extension for your swap entry in /etc/fstab, then it's being encrypted). That was the issue I had, it makes sense that you can't get the dumped data if the swap is being re-encrypted on every boot.
>> ....
> 
> For this use case (desire to be able to get crash dumps while having
> swap encrypted), I find that adding the "late" attribute to the
> "swap" entry in /etc/fstab is useful, thus:
> 
> g1-51(12.4-S)[1] grep swap /etc/fstab
> /dev/ada0s4b.eli        none            swap    sw,late         0       0

Thank you for sharing this tip!
When I needed to analyze crash dumps I added another partitions just for 
the dump but if this can be solved by late option for geli swap it would 
be really nice. I will try it.

Kind regards
Miroslav Lachman



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