"Spectre 2 mitigation: lfence not serializing"

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sxphild
Posts: 43
Joined: 04 Jul 2016 10:30
Location: Iowa, USA

"Spectre 2 mitigation: lfence not serializing"

Postby sxphild » 19 Aug 2018 16:41

Couldn't find a better place for this post..

I am fixing up an older HP laptop for a friend. (nx 6325)
I installed SolydX 1701 32 bit on it.
I also upgraded the AMD cpu.
both work.

It boots, but I get this message on startup:

"Spectre 2 mitigation: LFENCE NOT SERIALIZING: SWITCHING
TO GENERIC RETPOLINE".

The boot continues to the GRUB menu normally after that, but I
wonder if it could be disabled - puts a delay in the way.

Does anyone have an idea what's causing it, and what to do?

Thanks,

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Arjen Balfoort
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Re: "Spectre 2 mitigation: lfence not serializing"

Postby Arjen Balfoort » 19 Aug 2018 17:41

It's part of the latest kernel patches which is used to mitigate the Spectre vulnerability: https://wiki.debian.org/DebianSecurity/SpectreMeltdown

Have you tried the latest 32-bit ISOs? They are now in testing but perhaps they solve this issue for you: https://downloads.solydxk.com/ce/testing/


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sxphild
Posts: 43
Joined: 04 Jul 2016 10:30
Location: Iowa, USA

solydX_10_32 problem

Postby sxphild » 21 Aug 2018 16:23

Hi Arjen,

Thanks for the reply about the kernel upgrade.
I downloaded solydX_10_32ee from the link you provided,
and tried to run it from USB on the problem machine.

Two results:

1. I saw the same error message about Spectre 2: LFence etc.
as I booted it ( so possibly this version will not eliminate that..

2. An unexpected Login prompt appeared, asking for the password
for "SolydXK Live User". I tried no password, "password",
"live" - all told me this was incorrect..

After searching through forum posts -
I used "solydxk". No error message - the prompt disappeared
for a few seconds, so I thought the loading would continue..
but it reappeared, and asked for the password again...endless loop...

??? Any ideas? Is there now a different password?

Thanks for all your help. BTW, Do I see a musical instrument in your
Avatar? Looks like a bassoon...I am a classical musician...

Phil

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Arjen Balfoort
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Posts: 8817
Joined: 26 Jan 2013 19:36
Location: Netherlands
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Re: "Spectre 2 mitigation: lfence not serializing"

Postby Arjen Balfoort » 21 Aug 2018 16:56

Hi Phil,

Did you check (sha256sum) your download?
This kind of errors are usually a result of a faulty download.

The instrument on my photo is part of the Uilleann pipes: the drones, and regulators. Unfortunately I had to sell it. Now I only have a practice set (bag, bellows and chanter), a drum set, a piano, a classical guitar, an electrical guitar, a small collection of tin whistles and a bawu. In this family almost everybody plays an instrument.


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