ps: `ps aux` is rejected as an invalid PID

[matt-dz]

Summary

rshell and the oracle produced different pwd pwd -P; uname -a; ps aux | grep -E "kubelet|containerd|kube-apiserver" | grep -v grep results.

Command

pwd -P; uname -a; ps aux | grep -E "kubelet|containerd|kube-apiserver" | grep -v grep

Reduced command shape: pwd -P; uname -a; ps aux | grep -E "kubelet|containerd|kube-apiserver" | grep -v grep

Expected (oracle)

Exit code: 0

stdout:

/
Linux pshim-control-plane 6.17.0-1016-gcp #17~24.04.1-Ubuntu SMP Fri May  8 07:28:18 UTC 2026 aarch64 GNU/Linux
root         166  2.3  0.4 2856084 74936 ?       Ssl  15:24   2:17 /usr/local/bin/containerd
root         289  0.0  0.0 1237912 14976 ?       Sl   15:24   0:00 /usr/local/bin/containerd-shim-runc-v2 -namespace k8s.io -id d748f8731f8c3dfbeb1ffa4329e567bafb3d74459d05f342a40cc6480eab66b6 -address /run/containerd/containerd.sock
root         292  0.0  0.0 1238168 15032 ?       Sl   15:24   0:00 /usr/local/bin/containerd-shim-runc-v2 -namespace k8s.io -id ae1875b07e3dfdbd7af53ee5935fcfe26b954d13c69ac7166d1bf7fd80e7b1e7 -address /run/containerd/containerd.sock
root         300  0.0  0.0 1237912 15012 ?       Sl   15:24   0:00 /usr/local/bin/containerd-shim-runc-v2 -namespace k8s.io -id 8f692d617086ae7513386babff6793fe35fabbb8b657d26f1eb7a3bd4afef75b -address /run/containerd/containerd.sock
root         326  0.0  0.0 1238168 14932 ?       Sl   15:24   0:00 /usr/local/bin/containerd-shim-runc-v2 -namespace k8s.io -id 75b16d6d18bc5a7bcb104243648562e63e92f0bc5d0bba228c96002c5fa257f1 -address /run/containerd/containerd.sock
root         584  3.2  1.6 1520112 27
... <truncated>

stderr:

(empty)

Actual (rshell)

Exit code: 1

stdout:

/
Linux pshim-control-plane 6.17.0-1016-gcp #17~24.04.1-Ubuntu SMP Fri May  8 07:28:18 UTC 2026 aarch64

stderr:

ps: invalid PID: aux

Why This Matters

The QA run observed this command shape in 1 invocation across 1 scenario.

QA provenance

• QA run id: run-20260603t152010z-pwd
• Target builtin: pwd
• Rshell commit/version: unknown
• Example invocation: inv-20260603T170202.097191961Z-503e06f7
• Observed invocations: 1
• Scenario count: 1
• Differing dimension: exit_code, stdout, stderr
• Behavior cluster: pwd-unexpected-exit_code-stdout-stderr:pwd -P; uname -a; ps aux | grep -E "kubelet|containerd|kube-apiserver" | grep -v grep

[matt-dz]

QA triage correction: this was originally filed under pwd because the QA run target appeared in a multi-command script. The actual failing behavior in this report is ps aux producing ps: invalid PID: aux; the uname -a stdout delta is tracked separately in #522.