On 06/21/2018 03:24 PM, Susi Lehtola wrote:
> On 06/22/2018 12:00 AM, Rick Stevens wrote:
>> On 06/21/2018 11:13 AM, Susi Lehtola wrote:
>>> Update: I upgraded from Fedora 27 to Fedora 28, and the same issue
>>> persists. Of course, the kernel is almost the same.
>>>
>>> This has to be some weird kernel / BIOS bug...
>>
>> Can you send us the content of /proc/cmdline?
> 
> $ cat /proc/cmdline
> BOOT_IMAGE=/vmlinuz-4.16.16-300.fc28.x86_64
> root=/dev/mapper/luks-1d176bad-1b27-4e38-8c18-61a8b96517db ro
> rd.luks.uuid=luks-1d176bad-1b27-4e38-8c18-61a8b96517db
> rd.luks.uuid=luks-aae08a03-2832-4b82-8d74-598e02c6c445 rhgb quiet
> LANG=en_US.UTF-8

Ok, I don't see anything obnoxious there.

>> Also check any RAMdisks you may have (e.g. "df -h | grep tmpfs"). See
>> if any of them are possibly eating up RAM. I'd suspect /tmp and
>> (possibly) your swap partition.
> $ df -h |grep tmpfs
> devtmpfs        3.9G     0  3.9G   0% /dev
> tmpfs           3.9G     0  3.9G   0% /dev/shm
> tmpfs           3.9G  1.8M  3.9G   1% /run
> tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
> tmpfs           3.9G  104K  3.9G   1% /tmp
> tmpfs           789M   16K  789M   1% /run/user/42
> tmpfs           789M   24K  789M   1% /run/user/1000

Yeah, I don't see anything there truly worrying either. Don't know
what swap looks like (try "swapon" to see). If it's a partition
(like "dm-1" or something), that's not it, either.

> so this still would leave something like 40GB missing.

Yup. It is odd. I've never seen anything like this unless you have
something weird starting up early in the boot process. Perhaps a device
driver that's got weird stuff in its configuration and is part of your
initramfs. Do an "lsmod" and see if one of the modules listed is using a
boatload of memory. If so, then check the /etc/modprobe.d/* file for it
and see if there's something odd in there.

> I opened up a bug on the kernel tracker at
> https://bugzilla.redhat.com/show_bug.cgi?id=1593878

Yeah, that might be your best bet.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital    ri...@alldigital.com -
- AIM/Skype: therps2        ICQ: 226437340           Yahoo: origrps2 -
-                                                                    -
-   You possess a mind not merely twisted, but actually sprained.    -
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