On Thu, 2026-07-16 at 17:35 +0100, Richard Purdie via
lists.openembedded.org wrote:
> In order to try and attempt to reproduce the autobuilder qemuarm*
> hangs, I wanted to share a quick guide on how to hack things to make
> running multiple testimage tasks in parallel easy.
>
> Firstly, I added:
>
> BBCLASSEXTEND = "${@' '.join(['mcextend:'+str(x) for x in
> range(0,100)])}"
>
> to core-image-sato.bb
>
> I then deleted the test case files listed at the end of the email to
> make the tests run faster. The hangs are generally in the boot
> process
> before login so if we reach that point, it isn't a hang scenario. I
> could have probably set TEST_SUITES instead.
>
> I then ran "bitbake core-image-sato" to get a base image to run the
> tests with. After that, I used the following script fragment:
>
> cd tmp/deploy/images/qemuarm64
> for i in `seq 1 100`
> do
> ln -s core-image-sato{,-$i}-qemuarm64.rootfs.manifest
> ln -s core-image-sato{,-$i}-qemuarm64.rootfs.ext4.zst
> ln -s core-image-sato{,-$i}-qemuarm64.rootfs.testdata.json
> done
>
> I could the run 100 testimages in parallel with:
>
> bitbake `for ((i=1; i<=80; i++)); do echo -n "core-image-sato-$i ";
> done` -c testimage
>
> (which will run BB_NUMBER_THREADS in parallel)
>
> I'm sure there are neater ways to do it but this basically works.
>
> I haven't had any luck reproducing hangs with qemuarm64 with this
> yet.
> I did have to switch from using a DISPLAY over ssh to unsetting
> DISPLAY
> and using qemu's local vnc as otherwise the display traffic over ssh
> was limiting the CPU load I could trigger on my server.
>
> Hope someone finds this useful!
Rather than deleting tests, you can do:
TEST_SUITES = "date df parselogs perl ping scp ssh xorg"
Also, there is a decompression race in runqemu as it assumes only it is
booting a given image. You can work around it by creating an
uncompressed copy of the image in advance, e.g.:
zstd -d core-image-sato-qemuarmv5.rootfs-20260721071104.ext4.zst -o
core-image-sato-qemuarmv5.rootfs-20260721071104.ext4
Cheers,
Richard
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