On Mon, 2021-05-24 at 15:29 +0100, Richard Purdie via lists.yoctoproject.org wrote:

On Mon, 2021-05-24 at 09:21 -0400, Bruce Ashfield wrote:

On Sun, May 23, 2021 at 12:56 PM Richard Purdie
<richard.purdie@...> wrote:

On Sun, 2021-05-23 at 12:51 -0400, Bruce Ashfield wrote:

On Sun, May 23, 2021 at 12:47 PM Richard Purdie
<richard.purdie@...> wrote:

A set of SRCREVs sounds like the best plan, I think it might be worth testing
to see if things improve or not.

I created the attached recipes. Built and booted on qemux86-64 with no
issues.

I assume you'll do the appropriate preferred version in the test
branches to make
sure they are used instead of 5.10 ?

About the time you were writing this, I'd hacked up:

http://git.yoctoproject.org/cgit.cgi/poky/commit/?h=master-next&id=de3e2253482b6d9df1137128a9fde35dec8fd915

and put it into a build on the autobuilder. It caused meta-arm to blow up
and I suspect there may be other fallout but we'll see...

FWIW, I checked with Alexandre and it seems all the rcu failure issues
are on qemuXXX builds but not qemuXXX-alt. The former is 5.10, the latter 
5.4.

I'm starting to strongly suspect there is some issue with 5.10 as we don't
see this with dunfell or with poky-alt :/. I'd wonder why nobody else has
noticed though...

I switched to Bruce's 5.12 patches. Unfortunately even with 5.12:

https://autobuilder.yoctoproject.org/typhoon/#/builders/81/builds/2118/steps/12/logs/stdio

:(

Also,
https://autobuilder.yoctoproject.org/typhoon/#/builders/110/builds/2362
and the corresponding:
https://autobuilder.yocto.io/pub/non-release/20210523-10/testresults/qemuarm-alt/2021-05-24--01-52/host_stats_1_top.txt
is interesting. That was a qemuarm-alt image (5.4 kernel) which could be a genuine load 
issue. It is getting 300% cpu though so hardly resource starved.

Ideas welcome at this point.

Cheers,

Richard