F21 - Missing LVM swap partition or Hardware Error?

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Hey list!

So, I am experiencing a bug under Fedora 21 (I think that I also had it
under Fedora 20).

A bit of back story: The HDD which is used in this PC was in an older
one before. On the older PC I had Fedora 17 installed with LVM as my
file system. I had to reinstall my OS after a failed upgrade to Fedora
19. I think that I did not swipe the drive completely and just installed
Fedora 20 over the left pieces of what was once my operating system.
Now the used file system is ext4.
A couple of month later I bought this new PC where I used the old HDD,
because why not.
When I left my terminal open for a while I could see messages popping
up, telling me that there was something wrong with my CPU cache.
After some searching I found out that I didn't find out anything.
My computer didn't crash when this bug showed up so it didn't bother me.

I tried to upgrade to Fedora 21 a few weeks ago.
I tried booting into "System Upgrade" but it would stop after some time
telling me that there is a lvm swap partition missing or something.
I managed to finish the upgrade without any further problems.


And now SELinux (under F20 there where no warnings by SELinux) is
sometimes throwing a warning that says:

- ------------------------------------------------------------------------
- --------------------

reason: mce: [Hardware Error]: Machine check events logged


cmdline:

BOOT_IMAGE=/vmlinuz-4.1.4-100.fc21.x86_64
root=UUID=5ab84b55-b501-4390-a44b-f840ab4736f7 ro
vconsole.font=latarcyrheb-sun16 rd.lvm.lv=vg_user/lv_swap rhgb quiet
LANG=de_DE.UTF-8


dmesg(I post just the part where it says things about errors):

[   11.078336] [Hardware Error]: System Fatal error.
[   11.078339] [Hardware Error]: CPU:0 (15:2:0)
MC4_STATUS[Over|UE|-|PCC|-|-|-]: 0xf300000200190127
[   11.078342] [Hardware Error]: MC4 Error (node 0): Compute Unit Data
Error.
[   11.078343] [Hardware Error]: cache level: L3/GEN, tx: DATA, mem-tx:
WR
[   11.078345] [Hardware Error]: Deferred error.
[   11.078347] [Hardware Error]: CPU:2 (15:2:0)
MC2_STATUS[Over|CE|MiscV|-|-|Deferred|-]: 0xd8001000000c0172
[   11.078349] [Hardware Error]: MC2 Error: VB Data ECC or parity error.
[   11.078351] [Hardware Error]: cache level: L2, tx: INSN, mem-tx: EV
[   11.078352] [Hardware Error]: Corrected error, no action required.
[   11.078354] [Hardware Error]: CPU:3 (15:2:0)
MC2_STATUS[Over|CE|MiscV|-|AddrV|-|-|CECC]: 0xdc05406001040136
[   11.078357] [Hardware Error]: MC2 Error Address: 0x00000001d7773840
[   11.078358] [Hardware Error]: MC2 Error: Fill ECC error on data fills
.
[   11.078359] [Hardware Error]: cache level: L2, tx: DATA, mem-tx: DRD
- ------------------------------------------------------------------------
- --------------------

The error reproduces itself and seems to appear at random.

If you need any additional information just tell me.

Now it does look more and more like a hardware error, but I am highly
confused about the missing lvm_swap partition that it is trying to find.

Apart from that Fedora works just fine. (Well, GTK+ seems to cause
some trouble, but that problem is for another mail.^^)


Thank you for your help.

- -- Erik G.


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