runtime: multi-arch build via qemu fails to exec go binary [1.23 backport]

[prattmic]

I am requesting issue #68976 to be considered for backport to the next 1.23 minor release.

We already had a backport (#68995) to make failure to start the telemetry subprocess non-fatal. Unfortunately we misunderstood the problem (thinking that telemetry was special), when the real problem here is that any use of os.StartProcess / os/exec is broken under QEMU user mode >= 7.2, <8.0.

FWIW, QEMU user mode is not a first class supported OS. As I understand it, only real Linux is first class. QEMU user mode is an alternative Linux implementation. There is a workaround: use QEMU older than 7.2 or 8.0 or newer. That said, Debian bookworm has QEMU 7.2 in its apt repository, which I believe is why so many people are using such a narrow window of QEMU releases.

[gopherbot]

Change https://go.dev/cl/592078 mentions this issue: os: add clone(CLONE_PIDFD) check to pidfd feature check

[gopherbot]

Change https://go.dev/cl/612218 mentions this issue: [release-branch.go1.23] os: add clone(CLONE_PIDFD) check to pidfd feature check