I have 10 machines on dual core-i7 (amd64) with 16G RAM running 9.10.
They're randomly rebooting after months of stability with absolutely no
messages in the logs so I've assumed I've got a kernel panic and
installed linux-crashdump. I get no output in /var/crash, other than
once I had a log file that said it failed attempting to save a crash.
The log file disappeared so I don't have the exact message. I also don't
have console access so I'm not sure if I'm getting an error about
reserved memory that's not in a log file. The machines are in a remote
facility.

The wiki page (https://wiki.ubuntu.com/KernelTeam/CrashdumpRecipe) says
'In Karmic all that is needed is to install the "linux-crashdump"
package. After a reboot the system should be able to catch crash dumps
automatically and provide them to apport.'. This does not appear to be
true. The machines also have no direct internet access so apport does
not appear to work correctly, even with http_proxy set.

I don't get any crash dumps when simulating/forcing a crash (echo c >
/proc/sysrq-trigger) either.

However, I have a test VM with only 2GB of RAM and I do see dumps when I
force a crash. I'm wondering if the large memory (16GB) may have
something to do with this. The only other thing I have set differently
between the VM and the remote machines is kernel.panic=5 in sysctl. I
was thinking that may be forcing a reboot before the dump can complete?
I'm really not wanting to eliminate that setting though because I *need*
those machines to come back if they panic due to them being offsite.

-- 
linux-crashdump fails to record crash; reports memory not reserved
https://bugs.launchpad.net/bugs/321970
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