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Ran 29 Jun 2026 01:04PM UTC

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Committed 26 Jun 2026 07:05PM UTC coverage: 49.704% (-0.06%) from 49.762%

Job # #6085.1

Build Type

Pull #4188

travis-ci

Committed by

kenlacroix

Commit Message

Remove prlimit (RLIMIT_AS) address space limiting from qemu-img

The 1 GiB RLIMIT_AS address space limit on qemu-img subprocesses was
borrowed from an OpenStack Nova recommendation, but RLIMIT_AS caps
virtual (not physical/RSS) address space. The Go runtime reserves large
virtual address ranges via mmap that never become physical memory, so
the limit is fundamentally incompatible with Go programs and has caused
SIGSEGV/"cannot allocate memory" flakiness across architectures
(e.g. s390x).

The protection is also redundant: CDI runs in Kubernetes pods where the
container runtime enforces real memory limits via cgroups, and the limit
was only ever applied to the qemu-img info call.

Remove the RLIMIT_AS/RLIMIT_CPU prlimit mechanism and the unused
ProcessLimiter abstraction. ExecWithLimits and ProcessLimitValues.
CPUTimeLimit are kept: CPUTimeLimit still drives the context.WithTimeout
that protects against hung subprocesses (the 30s qemu-img info timeout).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Kenneth LaCroix <53909268+kenlacroix@users.noreply.github.com>

Pull Request Pull Request #4188: Remove prlimit (RLIMIT_AS) address space limiting from qemu-img execution

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