initramfs-tools: out-of-memory failures during autopkgtest

[Andrea Righi]

[Impact]

Some autopkgtest tests are failing due to out-of-memory conditions, especially amd64-ata-only and net.

It seems that we are creating a VM with 1GB only to run the amd64-ata-only test and even just 512MB for the net test.

It probably makes sense to create larger VMs (at least 2GB) to run these tests with a more recent kernels (that will likely require a little more RAM).

[Test case]

sudo autopkgtest . -- null

[Fix]

Increase memory size of instances used to run the autopkgtests to 2GB.

[Regression potential]

We may experience regressions in small cloud instances, or systems with less than 2GB or RAM that are using a recent kernel (but this is more a generic potential regression, not strictly related to initramfs-tools).

[Andrea Righi (arighi)]

All the initramfs-tools autopkgtest tests seem to run fine on a recent kernel (5.19) with the debdiff in attach applied.

[Benjamin Drung (bdrung)]

I checked all failing autopkgtests on mantic and the most recent ones on lunar. I only saw the `net` autopkgtest fail (which use 512 MB). So only 512 MB was too small, but 1 GB was enough recently.

0.142ubuntu3 ported the net autopkgtest to the common test framework and uses 1 GB now. I am marking it as fixed released due to the 0.142ubuntu3 upload. Please reopen this bug in case this version starts to have failing autopkgtest or in case you disagree that 1 GB is enough.