> On 26 May 2025, at 09:47, Tim Woodall <debianu...@woodall.me.uk> wrote:
>
> On Mon, 26 May 2025, Gareth Evans wrote:
>
>> Have you over/under-clocked or otherwise adjusted your CPU settings?
>>
> No, nothing changed
>> This "solved" issue which seems to be similar is put down to processor core
>> instability under certain conditions:
>>
>> https://bbs.archlinux.org/viewtopic.php?id=290093
>>
> It's certainly a possibility, but it seems bizarre that it's only affecting
> one VM out of 13.
>
> It did start when the weather got warmer.
>
>> As the last comment mentions, I was also wondering about the possibility of
>> thermal issues.
>>
>> Might a smartmon or memtest test be worthwhile?
>>
>> You don't seem to be dumping from read-only snapshots afaics, but that these
>> particular files might be changing between checksum and compression (or
>> whichever comes first) seems an unlikely spanner in the works.
>>
> The snapshot is not readonly (deliberately so I can run fsck before dumping)
> but it's not mounted while dumping, only while verifying. Changing files
> would cause a verification error, not a decompression error though.
>
> Back in the olden days before rw snapshots were possible (or properly
> reliable, IIRC until about 2010), I did occasionally get verification errors
> that I put down to the snapshot being inconsistent in some way despite a
> sync. I'm not exactly sure what journal replay on a ro snapshot implies.
> Since I started using rw snapshots and fsck before dumping, verification
> errors are so rare I don't recall the last time I saw one other than this
> issue. (It does sometimes happen but mostly it's a bug in dump or an ext4
> feature I've not tested properly)
>
>
>> HTH
>> Gareth
Yes the same VM and no other issues does seem odd. I would probably try to
rule out all other causes I could - smart read errors/remappings(?); though
memory testing is a pain…
Curious.
G
