Dumping on GELI consumers (was: FreeBSD 10.1 crashing under load)

[Fabian Keil]

Fabian Keil <freebsd-listen at fabiankeil.de> wrote:

> Christian Kujau <lists at nerdbynature.de> wrote:

> > Right now the system just reboots but leaves nothing in the system log as 
> > to _why_ it crashed. I've configured a crash dump device as per [0] but no 
> > crash dump is ever taken. I'm running with encrypted swap (via GELI), 
> > maybe crashdumping doesn't work with encrypted swap?
> 
> IIRC it's not officially supported but you can dump on the device
> below the geli layer:
> 
> fk at r500 ~ $swapinfo 
> Device          1K-blocks     Used    Avail Capacity
> /dev/ada0s1b.eli   2097152        0  2097152     0%
> fk at r500 ~ $dumpon -l
> ada0s1b
> 
> Saving the dump automatically after boot doesn't work (for me),
> but "service savecore start" works after "swapoff -a".

For the archives: It works as expected when enabling the swap device
with rc.d/swaplate. Currently this requires a small swapon patch:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198598

Fabian
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