df: root-device mountpoint differs in `df` output

[matt-dz]

Summary

rshell and the oracle produced different pwd pwd; pwd -P; uname -a; df -h results.

Command

pwd; pwd -P; uname -a; df -h

Reduced command shape: pwd; pwd -P; uname -a; df -h

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
Filesystem      Size  Used Avail Use% Mounted on
overlay          61G   39G   23G  64% /
tmpfs            64M     0   64M   0% /dev
shm              64M     0   64M   0% /dev/shm
tmpfs           7.8G   11M  7.8G   1% /run
tmpfs           7.8G  443M  7.4G   6% /tmp
/dev/root        61G   39G   23G  64% /pshim-artifacts
tmpfs           5.0M     0  5.0M   0% /run/lock
shm              64M     0   64M   0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/c0419093d6ab1c5b2d4ee15716f302889b07698d0818f2ce40abe8627b76849d/shm
shm              64M     0   64M   0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/7f07e8979f191a68f439a1eaff572c39bd46593191b92e24dc20361ff87595c2/shm
shm              64M     0   64M   0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/bd316ec2b4ecdd2ba732284b229ca09d7d76b11f69200629ed152c56b5901e5d/shm
shm              64M     0   64M   0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/abfe81e503a1c786bfec3e127a6b7b0527ae68762b54433b57277216624cc4c4/shm
overlay          61G   39G   23G  64% /run/containerd/io.con
... <truncated>

stderr:

(empty)

Actual (rshell)

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
Filesystem      Size  Used Avail Use% Mounted on
overlay          61G   39G   23G  64% /
tmpfs            64M     0   64M   0% /dev
shm              64M     0   64M   0% /dev/shm
tmpfs           7.8G   11M  7.8G   1% /run
tmpfs           7.8G  443M  7.4G   6% /tmp
/dev/root        61G   39G   23G  64% /var
tmpfs           5.0M     0  5.0M   0% /run/lock
shm              64M     0   64M   0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/c0419093d6ab1c5b2d4ee15716f302889b07698d0818f2ce40abe8627b76849d/shm
shm              64M     0   64M   0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/7f07e8979f191a68f439a1eaff572c39bd46593191b92e24dc20361ff87595c2/shm
shm              64M     0   64M   0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/bd316ec2b4ecdd2ba732284b229ca09d7d76b11f69200629ed152c56b5901e5d/shm
shm              64M     0   64M   0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/abfe81e503a1c786bfec3e127a6b7b0527ae68762b54433b57277216624cc4c4/shm
overlay          61G   39G   23G  64% /run/containerd/io.containerd.runtime.v2.tas
... <truncated>

stderr:

(empty)

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-20260603T175142.241643138Z-5a8eb7c3
• Observed invocations: 1
• Scenario count: 1
• Differing dimension: stdout
• Behavior cluster: pwd-unexpected-stdout:pwd; pwd -P; uname -a; df -h

[matt-dz]

QA triage correction: this was originally filed under pwd, but the unique non-uname diff is df reporting a different mountpoint for the root device. The uname -a stdout delta is tracked separately in #522.